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Purgina C, Ulrich S, Weber M, Grímsson F. Morphological and Ultrastructural Features of Selected Epidendroideae Pollen Dispersal Units and New Insights into Their Chemical Nature. Plants (Basel) 2024; 13:1114. [PMID: 38674523 PMCID: PMC11053828 DOI: 10.3390/plants13081114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/05/2024] [Accepted: 04/08/2024] [Indexed: 04/28/2024]
Abstract
Orchidaceae display enormous diversity in their flower morphology, which is particularly evident in their pollen dispersal units (pollinia, pollinaria). The packaging of pollen by elastoviscin leads to a great diversity of these morphologically and structurally complex pollen units. Despite being one of the most diverse angiosperm families, the available palynological data on orchids remain limited and sometimes contradicting. This study provides new insights into the pollen morphology and ultrastructure of five orchid species from the subfamily Epidendroideae, using combined light, scanning electron, and transmission electron microscopy. The aim was to compare the morphology and ultrastructure of pollen dispersal units and to elucidate the chemical nature of the pollen wall layers and of elastoviscin. Our combined light and electron microscopy investigation demonstrated the presence of six tetrad types even within a single pollinium, which is unique for orchids. The application of different staining methods confirmed the assumed lipidic nature of elastoviscin and the differences in its contrast and ultrastructure suggest a mixture of sticky materials with dissimilar chemical compositions. This study affirmed that sporopollenin is mostly restricted to the outer pollen grains of peripheral tetrads in compact and sectile pollinia, while inner tetrads exhibit highly reduced non-sporopollenin pollen walls.
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Affiliation(s)
- Carola Purgina
- Department of Botany and Biodiversity Research, Division of Structural and Functional Botany, University of Vienna, 1030 Vienna, Austria; (S.U.); (M.W.)
| | - Silvia Ulrich
- Department of Botany and Biodiversity Research, Division of Structural and Functional Botany, University of Vienna, 1030 Vienna, Austria; (S.U.); (M.W.)
- Department of Historical Archaeology, Austrian Archaeological Institute (OeAI), Austrian Academy of Sciences (OeAW), 1010 Vienna, Austria
| | - Martina Weber
- Department of Botany and Biodiversity Research, Division of Structural and Functional Botany, University of Vienna, 1030 Vienna, Austria; (S.U.); (M.W.)
| | - Friðgeir Grímsson
- Department of Botany and Biodiversity Research, Division of Structural and Functional Botany, University of Vienna, 1030 Vienna, Austria; (S.U.); (M.W.)
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Wróblewska A, Ostrowiecka B, Kotowicz J, Jermakowicz E, Tałałaj I, Szefer P. What are the drivers of female success in food-deceptive orchids? Ecol Evol 2024; 14:e11233. [PMID: 38646005 PMCID: PMC11026981 DOI: 10.1002/ece3.11233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 03/05/2024] [Accepted: 03/20/2024] [Indexed: 04/23/2024] Open
Abstract
A large suite of floral signals, and environmental and biotic characteristics influence the behavior of pollinators, affecting the female success of food-deceptive orchids. In this study, we examined the many factors shaping the reproductive output of three orchid taxa: Dactylorhiza majalis, D. incarnata var. incarnata, and D. fuchsii. We applied a statistical model to correlate female success (number of fruit sets) with individual characteristics (plant and inflorescence height, number of flowers, and spur length), number of pollinaria removed, flowering time, and density of floral units of co-flowering rewarding plants. Our findings suggested that the broad spectrum of variations in Dactylorhiza's morphological traits, floral display, and flowering phenology within different environmental contexts has a significant impact on their reproductive success. The number of fruits increased with an increase in the number of pollinaria removed in the studied Dactylorhiza taxa. In contrast, a higher number of flowers per inflorescence and higher inflorescences in relation to individual height always decreased fruit set. We observed that low number of co-flowering rewarding plants in populations could affect the Dactylorhiza reproductive output as magnets and competitor plants. The synchronization of flowering, or lack thereof, between Dactylorhiza and rewarding plants can limit reproductive success. This demonstrates that the food deception strategy is multidirectional, and reproductive output can vary considerably both spatially and temporally within the context of this strategy.
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Affiliation(s)
- Ada Wróblewska
- Faculty of BiologyUniversity of BialystokBiałystokPoland
| | | | | | | | | | - Piotr Szefer
- Faculty of ScienceUniversity of South BohemiaČeské BudějoviceCzech Republic
- Biology Centre, Institute of EntomologyCzech Academy of SciencesČeské BudějoviceCzech Republic
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Chua RW, Song KP, Ting ASY. Antioxidant and L-asparaginase activities of culturable endophytic fungi from ornamental Dendrobium orchids. Lett Appl Microbiol 2024; 77:ovad096. [PMID: 37563083 DOI: 10.1093/lambio/ovad096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Revised: 08/02/2023] [Accepted: 08/09/2023] [Indexed: 08/12/2023]
Abstract
This study reports the antioxidant potential and L-asparaginase production of culturable fungal endophytes from Dendrobium orchids in Malaysia. Twenty-nine isolates were screened using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay to determine their free radical scavenging activities and antioxidant capacity (IC50 and AEAC). L-asparaginase production of fungal endophytes was detected by the qualitative plate assay, and the enzyme activities estimated via the Nesslerization method. All 29 endophytic isolates exhibited various degrees of radical scavenging activities (35.37%-77.23%), with Fusarium fujikuroi (D1) identified as having the highest antioxidant capacity (IC50 6.097 mg/mL) and the highest AEAC value (11.55 mg/g). For L-asparaginase production, the majority of the isolates (89.66%) showed positive results, especially among the culturable species of Fusarium, Trichoderma, and Daldinia. Most Fusarium spp. were able to produce L-asparaginase (80.77%), but the highest L-asparaginase activity was detected in Daldinia eschscholtzii (D14) with 2.128 units/mL. Results from this study highlighted the potential of endophytic fungi from medicinal orchids (Dendrobium sp.) as natural sources of bioactive compounds to be developed into novel antioxidants and anticancer drugs.
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Affiliation(s)
- Ru Wei Chua
- School of Science, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
| | - Keang Peng Song
- School of Science, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
| | - Adeline Su Yien Ting
- School of Science, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
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Pansarin ER. Nectar-mediated avian pollination in Cattleya (Orchidaceae: Laeliinae). Plant Biol (Stuttg) 2024; 26:181-187. [PMID: 38168075 DOI: 10.1111/plb.13606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 11/24/2023] [Indexed: 01/05/2024]
Abstract
Orchids are notable for the variety of rewards produced for their pollinators. Nevertheless, many species are rewardless and pollinated by food-deceptive strategies. This is the case for Cattleya, a Neotropical genus of more than 100 species supposedly pollinated by food-deception. Here, I studied a member of the clade Sophronitis (Cattleya cernua) in forest areas of southeastern Brazil. The study included analyses of floral morphology, light microscopy of secretory tissues, histochemistry of flower resources, and measurements of nectar volume and concentration. Data on pollinators and mechanisms of pollination were collected in the field by means of film records, while breeding systems were studied using experimental treatments applied to cultivated specimens. The flower traits of Cattleya cernua show strong adaptation to avian pollination. Flowers produce 1-7 μl of a moderately concentrated nectar (17-50%). A secretory tissue at the distal portion of the cuniculus is responsible for nectar secretion. Secreted nectar is stored in the nectar chamber. Pollinaria deposition on the apex of bird beaks allows both short- and long-billed birds to pollinate the flowers. Plants from the studied population were fully self-compatible but pollinator-dependent. Pollinator frequency was higher than in food-deceptive Cattleya. As far as is known, this is the first record of nectar production in Cattleya. The discovery of a reward-producing species (C. cernua) within a genus entirely pollinated by food-deception strategies (Cattleya) provides clues and new insights into understanding the diversification of Laeliinae across the Neotropics.
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Affiliation(s)
- E R Pansarin
- Department of Biology, Laboratory of Molecular Biology and Systematics of Plants, University of São Paulo, Faculty of Philosophy, Sciences and Literature of Ribeirão Preto, Ribeirão Preto, SP, Brazil
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Li R, Gao X, Wu Y, Wei C, Li MH, Liu DK, Liu ZJ. Identification and Analysis of PEPC Gene Family Reveals Functional Diversification in Orchidaceae and the Regulation of Bacterial-Type PEPC. Int J Mol Sci 2024; 25:2055. [PMID: 38396732 PMCID: PMC10888551 DOI: 10.3390/ijms25042055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 01/29/2024] [Accepted: 02/05/2024] [Indexed: 02/25/2024] Open
Abstract
Phosphoenolpyruvate carboxylase (PEPC) gene family plays a crucial role in both plant growth and response to abiotic stress. Approximately half of the Orchidaceae species are estimated to perform CAM pathway, and the availability of sequenced orchid genomes makes them ideal subjects for investigating the PEPC gene family in CAM plants. In this study, a total of 33 PEPC genes were identified across 15 orchids. Specifically, one PEPC gene was found in Cymbidium goeringii and Platanthera guangdongensis; two in Apostasia shenzhenica, Dendrobium chrysotoxum, D. huoshanense, Gastrodia elata, G. menghaiensis, Phalaenopsis aphrodite, Ph. equestris, and Pl. zijinensis; three in C. ensifolium, C. sinense, D. catenatum, D. nobile, and Vanilla planifolia. These PEPC genes were categorized into four subgroups, namely PEPC-i, PEPC-ii, and PEPC-iii (PTPC), and PEPC-iv (BTPC), supported by the comprehensive analyses of their physicochemical properties, motif, and gene structures. Remarkably, PEPC-iv contained a heretofore unreported orchid PEPC gene, identified as VpPEPC4. Differences in the number of PEPC homolog genes among these species were attributed to segmental duplication, whole-genome duplication (WGD), or gene loss events. Cis-elements identified in promoter regions were predominantly associated with light responsiveness, and circadian-related elements were observed in each PEPC-i and PEPC-ii gene. The expression levels of recruited BTPC, VpPEPC4, exhibited a lower expression level than other VpPEPCs in the tested tissues. The expression analyses and RT-qPCR results revealed diverse expression patterns in orchid PEPC genes. Duplicated genes exhibited distinct expression patterns, suggesting functional divergence. This study offered a comprehensive analysis to unveil the evolution and function of PEPC genes in Orchidaceae.
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Affiliation(s)
- Ruyi Li
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
| | - Xuyong Gao
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
| | - Yuwei Wu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
| | - Chunyi Wei
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
| | - Ming-He Li
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
- Fujian Colleges and Universities Engineering Research Institute of Conservation and Utilization of Natural Bioresources, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Ding-Kun Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
- Fujian Colleges and Universities Engineering Research Institute of Conservation and Utilization of Natural Bioresources, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Zhong-Jian Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at Landscape Architecture and Arts, Fujian Agriculture and Forestry University, Fuzhou 350002, China; (R.L.); (X.G.); (Y.W.); (C.W.); (M.-H.L.)
- Fujian Colleges and Universities Engineering Research Institute of Conservation and Utilization of Natural Bioresources, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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Lanzino M, Palermo AM, Pellegrino G. Pollination mechanism in Serapias with no pollinaria reconfiguration. AoB Plants 2023; 15:plad054. [PMID: 37899971 PMCID: PMC10601389 DOI: 10.1093/aobpla/plad054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 08/09/2023] [Indexed: 10/31/2023]
Abstract
Orchidaceae, one of the most numerous families in the world's flora, have evolved various pollination strategies to favour cross-pollination, such as deceptive pollination and pollinarium reconfiguration. Among the terrestrial orchids of the Mediterranean, only species belonging to the genus Serapias show a strategy defined as shelter imitation. The floral elements form a tubular structure that insects use during their resting phases. The purpose of this article was to clarify the mechanisms that guarantee pollination with particular attention to the morphological interactions between orchids and pollinators and whether pollinaria reconfiguration is necessary in the promotion of cross-pollination in Serapias. Breeding system experiments and hand-pollination treatments indicated that Serapias was highly self-compatible, shows low value of natural fruit set and is pollinator limited. Time-lapse photos showed that the pollinarium had no refolding of the stipe or caudicle after its removal from the flower. The morphology of the flower determined the attack of the pollinarium on the occiput/vertex of insect. When the insect left the flower, the pollinarium was unable to encounter the stigma. When the insect made a second visit to another flower, the pollen masses of the first pollinarium ended up on the stigma and at the same time, the insect picked up a second pollinarium. Our observations and analyses suggested that morphological interactions between flower and pollinator are crucial to the success of pollination and to prevent self-pollination and thus that pollinarium reconfiguration is unnecessary in shelter deceptive orchids, such as Serapias species, for the promotion of cross-pollination. Serapias represent a case of interactions between plant and pollinator; the formation of the tubular shape of the flower is an essential preadaptation for the development of resting site mimicry originating exclusively in Serapias among Mediterranean orchids.
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Affiliation(s)
- Micaela Lanzino
- Department of Biology, Ecology and Earth Sciences, University of Calabria, 87036 Rende, Cosenza, Italy
| | - Anna Maria Palermo
- Department of Biology, Ecology and Earth Sciences, University of Calabria, 87036 Rende, Cosenza, Italy
| | - Giuseppe Pellegrino
- Department of Biology, Ecology and Earth Sciences, University of Calabria, 87036 Rende, Cosenza, Italy
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Kirkwood A, Fisk I, Ayed C, Xu Y, Yang N. A flavour perspective of Tiepishihu ( Dendrobium officinale) - an emerging food ingredient from popular traditional Chinese medicinal plants: a review. Int J Food Sci Technol 2023; 58:4921-4930. [PMID: 38505827 PMCID: PMC10947447 DOI: 10.1111/ijfs.16608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Accepted: 07/22/2023] [Indexed: 03/21/2024]
Abstract
Many Dendrobium orchid stems are used in Traditional Chinese Medicine (TCM). The most popular and premium species is Dendrobium officinale, and its stem in TCM is called Tiepishihu. Tiepishihu has a sweet flavour and is an ingredient in Chinese tea and desserts. There is no comprehensive understanding of its flavour compounds. It is, therefore, essential to understand compounds responsible for its flavour, and how they are formed. This review assesses twelve diverse studies in Tiepishihu flavour (2013-2022). Thirty aroma compounds were compared - furfural and nonanal were identified as common compounds. Four of seven essential amino acids were taste-active, with lysine being the most potent. Pre-harvest factors such as environment impact specific aroma compounds. Post-harvest processing methods, including drying and grinding, can control Tiepishihu's flavour. Methodological consistency is a challenge, but controlling Tiepishihu's flavour could increase its commercial value as a food ingredient.
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Affiliation(s)
- Aidan Kirkwood
- Division of Food, Nutrition and DieteticsUniversity of Nottingham, Sutton Bonington CampusLoughboroughLE12 5RDUK
| | - Ian Fisk
- Division of Food, Nutrition and DieteticsUniversity of Nottingham, Sutton Bonington CampusLoughboroughLE12 5RDUK
- The University of AdelaideNorth TerraceAdelaideSouth AustraliaAustralia
| | - Charfedinne Ayed
- Division of Food, Nutrition and DieteticsUniversity of Nottingham, Sutton Bonington CampusLoughboroughLE12 5RDUK
| | - Yingjian Xu
- Golden Keys High‐Tech Materials Co., LtdFirst and Second Floor, Building No. 3, Guizhou ChanTou Science and Tech Industrial Park, Hulei Road, Huchao TownGuian new AreaGuizhou ProvinceChina
- Department of ChemistryUniversity of WarwickCoventryCV4 7ALUK
| | - Ni Yang
- Division of Food, Nutrition and DieteticsUniversity of Nottingham, Sutton Bonington CampusLoughboroughLE12 5RDUK
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Wang X, Peng P, Bai M, Bai W, Zhang S, Feng Y, Wang J, Tang Y. Impacts of physiological characteristics and human activities on the species distribution models of orchids taking the Hengduan Mountains as a case. Ecol Evol 2023; 13:e10566. [PMID: 37791293 PMCID: PMC10542477 DOI: 10.1002/ece3.10566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 09/06/2023] [Accepted: 09/14/2023] [Indexed: 10/05/2023] Open
Abstract
The biogeography research of orchids through species distribution models (SDMs), a vital tool in the biogeography field, is critical to understanding the fundamental geographic distribution patterns and identifying conservation priorities. The correspondence between species occurrence and environmental information is crucial to the model's performance. However, ecological preferences unique to different orchid species, such as their life forms, are often overlooked during the modeling process. This oversight can introduce bias and increase model uncertainty. Additionally, human activities, as an important potential predictor, have not been quantified in any orchid SDMs. Taking the Hengduan Mountains as an example, we preprocessed all orchid species' occurrences based on physiological characteristics. Choosing five spatial factors related to human activities to quantify the interference and enter into models as HI factor. Using different modeling methods (GLM, MaxEnt, and RF) and evaluation indices (AUC, TSS, and Kappa), diverse modeling strategies have been constructed in the study. A double-ranking method has been adopted to select the critical orchid distribution regions. The results showed that classification models based on physiological characteristics significantly improved the model's accuracy while adding the HI factor had the same effect but the absence of enough significance. Suitability maps indicated that highly heterogeneous mountainous areas were vital for the distribution of orchids in the Hengduan Mountains. Different distribution patterns and critical regions existed between various orchid life forms geographically - terrestrial orchids were dominant in the mountain, and mycoherterophical orchids were primarily located in the north, more influenced by vegetation and temperature. Critical regions of epiphytic orchids were in the south due to a greater dependence on precipitation and temperature. These studies are informative for understanding the orchids' geographic distribution patterns in the Hengduan Mountains, promoting conservation and providing references for similar research beyond orchids.
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Affiliation(s)
- Xue‐Man Wang
- College of Earth SciencesChengdu University of TechnologyChengduChina
| | - Pei‐Hao Peng
- College of Earth SciencesChengdu University of TechnologyChengduChina
| | - Mao‐Yang Bai
- College of Earth SciencesChengdu University of TechnologyChengduChina
| | - Wen‐Qian Bai
- College of Earth SciencesChengdu University of TechnologyChengduChina
| | - Shi‐Qi Zhang
- College of Earth SciencesChengdu University of TechnologyChengduChina
| | - Yu Feng
- College of Earth SciencesChengdu University of TechnologyChengduChina
| | - Juan Wang
- College of Tourism and Urban‐rural PlanningChengdu University of TechnologyChengduChina
| | - Ying Tang
- College of Tourism and Urban‐rural PlanningChengdu University of TechnologyChengduChina
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Santos ISD, Silva MJD. Anatomy and Histochemistry of the Vegetative System of Brachystele guayanensis (Lindl.) Schltr. (Orchidaceae), a Potential Medicinal Species. Plants (Basel) 2023; 12:2635. [PMID: 37514251 PMCID: PMC10386664 DOI: 10.3390/plants12142635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 07/01/2023] [Accepted: 07/03/2023] [Indexed: 07/30/2023]
Abstract
The orchid genus Brachystele Schltr. (Orchidoideae, Cranichideae, Spiranthinae) comprises 20 species distributed from Mexico to Argentina, with 10 species found in Brazil. Anatomical studies of Orchidoideae Lindl. have been scarce, and the anatomy and histochemistry of Brachystele are still largely unknown. In this study, we conducted a characterization of the vegetative organs of B. guayanensis (Lindl.) Schltr. using standard anatomical and histochemical microtechniques. In this study, we provide the first information about the anatomy and histochemistry of Brachystele. The studied species was observed to display anatomical characters commonly found in the vegetative organs of representatives of the Cranichideae tribe (e.g., uniseriate epidermis; homogeneous mesophyll with 6-11 layers; rhizomes with rings of fibers; vascular bundles in the form of "^" or "v"; fleshy roots with uniseriate velamen, simple trichomes, and spiranthosomes). Others can be interpreted as adaptive strategies conditioned by the environment and their terrestrial life form (e.g., cuticle thickness; amphistomatic leaves; roots with reduced velamen compared to the cortex (18-20 layers); and raphides). In this study, cataphylls, and the presence of spiranthosomes in leaves, including stomatal guard cells, as well as alkaloids in these structures, are anatomically described for the first time in Orchidaceae. The presence of hyphae and pelotons in the stem of B. guayanensis is described for the first time in Cranichideae. Histochemical tests confirmed the presence of lignin, proteins, and alkaloids, the lipidic nature of the cuticle, starch grains stored in spiranthosomes, and the composition of the raphides. Alkaloids were observed in abundance, particularly in the roots, suggesting a potential role in defense against pathogens and herbivores, as well as potential medicinal activities, as seen in phylogenetically related groups to Brachystele.
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Affiliation(s)
- Igor Soares Dos Santos
- Post-Graduate Program in Plant Biology, Department of Botany, Institute of Biosciences, São Paulo State University (Unesp), Botucatu 18618-970, SP, Brazil
| | - Marcos José da Silva
- Laboratory of Molecular Systematics and Plant Taxonomy, Department of Botany, Institute of Biological Science, Federal University of Goiás (UFG), Goiânia 74001-970, GO, Brazil
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10
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Arias T, Chaux-Varela J, Camero MDP, Calderon-Álvarez RA, Trujillo AC, Correa-Munera MA, Zuluaga A, Perdomo O, Pérez-Escobar OA, Trujillo-Trujillo E, Valencia-D. J. Checklist of Orchidaceae from Caquetá, Colombia. PhytoKeys 2023; 229:21-46. [PMID: 37457384 PMCID: PMC10346030 DOI: 10.3897/phytokeys.229.102737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 06/15/2023] [Indexed: 07/18/2023]
Abstract
A checklist of Orchidaceae from Caquetá, Colombia is presented here. We recorded 98 genera and 418 species, exceeding a previous inventory by 276 species. The checklist is conservative in the number of genera and species by including only taxa that were fully and reliably identified and that are either linked to a corresponding herbarium voucher, a living collection specimen or a photo taken in the field and published in iNaturalist by one of the authors or a collaborator. The documented species diversity in the region could dramatically increase in the next few years with additional collecting efforts in the eastern slopes of the Andes nested in Caquetá. About 9% (418/4600) of all Orchidaceae species recorded for Colombia are reported for this area, showing the important contribution to orchid diversity of Andean-Amazonian foothills of Caquetá.
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Affiliation(s)
- Tatiana Arias
- Marie Selby Botanical Gardens, Sarasota FL, USA
- Sociedad Colombiana de Orquideología, Medellín, Antioquia, Colombia
| | - Jeisson Chaux-Varela
- Departamento de Biología, Universidad de la Amazonia, Florencia, Caquetá, Colombia
| | | | - R. Alexis Calderon-Álvarez
- Departamento de Biología, Universidad de la Amazonia, Florencia, Caquetá, Colombia
- Grupo de Investigación en Ecología y Territorio, Departamento de Ecología y Territorio, Pontificia Universidad Javeriana, Bogotá D.C., Colombia
| | | | - Marco A. Correa-Munera
- Departamento de Biología, Universidad de la Amazonia, Florencia, Caquetá, Colombia
- Jardín Botanico Uniamazonia and Herbario Enrique Forero – HUAZ, Florencia, Caquetá, Colombia
| | - Alejandro Zuluaga
- Departamento de Biología, Universidad del Valle, Cali, Valle del Cauca, Colombia
| | - Oscar Perdomo
- Departamento de Biología, Universidad de la Amazonia, Florencia, Caquetá, Colombia
| | - Oscar A. Pérez-Escobar
- Grupo de Investigación en Agroecosistemas y Conservación en Bosques Amazónicos GAIA, Universidad de la Amazonia, Florencia, Caquetá, Colombia
| | | | - Janice Valencia-D.
- Departamento de Biología, Universidad de la Amazonia, Florencia, Caquetá, Colombia
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11
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Fiorini CF, de Camargo Smidt E, Lacey Knowles L, Leite Borba E. Hybridization boosters diversification in a Neotropical Bulbophyllum (Orchidaceae) group. Mol Phylogenet Evol 2023:107858. [PMID: 37329930 DOI: 10.1016/j.ympev.2023.107858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 06/06/2023] [Accepted: 06/10/2023] [Indexed: 06/19/2023]
Abstract
Genetic data shows that cryptic hybrids are more common than previously thought and that hybridization and introgression are widespread processes. Regardless, studies on hybridization are scarce for the highly speciose Bulbophyllum. The genus presents more than 2,200 species and many examples of recent radiations, in which hybridization is expected to be frequent. Currently, only four natural Bulbophyllum hybrids are recognized, all of them recently described based on morphological evidence. Here we test whether genomic evidence supports the hybrid status of two Neotropical Bulbophyllum species, while also evaluating the impact of this phenomenon on the genomes of the putative parental species. We also assess if there is evidence of hybridization among B. involutum and B. exaltatum, sister species that diverged recently. We leverage the power of next-generation sequence data, associated with model-based analysis for three systems putatively constituted by two parental species and one hybrid. All taxa belong to the Neotropical B. sect. Didactyle clade. We found evidence of hybridization in all studied systems. Despite the occurrence of hybridization, there are no signs of backcrossing. Because of the high propensity of hybridization across many taxa, the common occurrence of hybridization during the evolutionary history of B. sect. Didactyle means it is time to account for and examine its evolutionary role in these orchids.
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Affiliation(s)
- Cecilia F Fiorini
- Departamento de Genética, Ecologia e Evolução, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil; Departamento de Botânica, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil.
| | - Eric de Camargo Smidt
- Departamento de Botânica, Universidade Federal do Paraná, Curitiba, Paraná, 81531-990, Brazil.
| | - L Lacey Knowles
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan, 48109-1085, USA.
| | - Eduardo Leite Borba
- Departamento de Botânica, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil.
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12
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Pansarin ER, Menezes EDLF. A new remarkable Vanilla Mill. (Orchidaceae) species endemic to the Espinhaço Range, Brazil: its phylogenetic position and evolutionary relationships among Neotropical congeners. PhytoKeys 2023; 227:151-165. [PMID: 37334177 PMCID: PMC10273138 DOI: 10.3897/phytokeys.227.101963] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Accepted: 05/26/2023] [Indexed: 06/20/2023]
Abstract
During surveys conducted on Neotropical Vanilla, a new endemic species was found in the Brazilian campos rupestres of the Espinhaço Range. Here, this new remarkable Vanilla species, namely V.rupicola Pansarin & E.L.F. Menezes, is described and illustrated. A phylogeny for Vanilla is presented and the relationships between Neotropical species are discussed. The position of V.rupicola among Neotropical Vanilla is discussed within an evolutionary context. Vanillarupicola is recognized by its rupicolous habit, its reptant stems, and its sessile and rounded leaves. This remarkable new taxon emerges in a clade that includes V.appendiculata Rolfe and V.hartii Rolfe. Vegetative and floral features support a close relationship between V.rupicola and sister taxa, mainly regarding the apical inflorescence (V.appendiculata), the type of appendages of the central crest of the labellum, and the labellar color pattern. Phylogenetic inference suggests that the circumscription of Neotropical Vanilla groups needs revision.
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Affiliation(s)
- Emerson Ricardo Pansarin
- Department of Biology, Faculty of Philosophy, Sciences and Literature of Ribeirão Preto, University of São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP, 14040-901, BrazilUniversity of São PauloSao PaoloBrazil
| | - Euler da Luz Fernandes Menezes
- Postgraduate Program of Graduation in Forest Science, Federal University of Vales do Jequitinhonha e Mucuri (UFVJM), Highway MGT 367-km 583, n° 5.000, Alto da Jacuba, Diamantina, MG, 39.100-000, BrazilFederal University of Vales do Jequitinhonha e MucuriDiamantinaBrazil
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13
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Turco A, Albano A, Medagli P, D'Emerico S, Wagensommer RP. Orchidaceae in Puglia (Italy): Consistency, Distribution, and Conservation. Plants (Basel) 2023; 12:plants12112223. [PMID: 37299203 DOI: 10.3390/plants12112223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Revised: 06/01/2023] [Accepted: 06/02/2023] [Indexed: 06/12/2023]
Abstract
A study of the distribution of orchid species in Puglia, based on an analysis of 2084 bibliographic reports from 2000 to 2022, was carried out with the aim of revising and updating the information on the consistency of the Orchidaceae family in Puglia, with a special focus on assessing threatened species occurring inside and outside protected areas. The work presents a checklist of the Orchidaceae taxa (genera, species, and subspecies) found in the region, including observations on genera and species that present taxonomic challenges. A total of 113 taxa (i.e., species and subspecies), distributed across 16 genera, are listed in alphabetical order. The most representative genera were Ophrys (51 taxa), Serapias (15 taxa), and Epipactis (11 taxa). Additionally, 49 taxa (43.4%) were found to be endemic to Italy, with 21 of these, mostly belonging to the Ophrys genus, being exclusive to Puglia. Our study notes two different trends of distribution: a predominantly coastal distribution for orchid records located in southern Puglia (the Salento peninsula) and a more widespread distribution for the other provinces. Our study also shows that the greatest number of records locate orchids in protected areas with a positive correlation between their presence and habitats cited in Directive 92/43/EEC.
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Affiliation(s)
- Alessio Turco
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, 73100 Lecce, Italy
| | - Antonella Albano
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, 73100 Lecce, Italy
| | - Pietro Medagli
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Salento University, 73100 Lecce, Italy
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14
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Deng X, Hu C, Xie C, Lu A, Luo Y, Peng T, Huang W. Metabolomic and Transcriptomic Analysis Reveal the Role of Metabolites and Genes in Modulating Flower Color of Paphiopedilum micranthum. Plants (Basel) 2023; 12:2058. [PMID: 37653975 PMCID: PMC10220555 DOI: 10.3390/plants12102058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Revised: 05/16/2023] [Accepted: 05/19/2023] [Indexed: 09/02/2023]
Abstract
Food-deceptive flowers primarily use visual signals (such as color) to mimic model plants and deceive insects into achieving pollination. Paphiopedilum micranthum is a food-deceptive orchid that has a pink labellum and two purple petals with a yellow base and has been proven to be pollinated by bumblebees. However, the chemical and molecular bases of the floral color are not well understood. We conducted targeted metabolite profiling and transcriptomic analysis to determine the color signal and its genetic basis in P. micranthum. We found that both anthocyanins and carotenoids contribute significantly to the formation of floral color that determines the color signal. Higher concentrations of anthocyanins (cyanidin and peonidin) and carotenoids (primarily lutein and zeaxanthin) were detected in the petal compared to the labellum. The upregulation of structural genes of CHS, F3'H, DFR and ANS on the anthocyanin biosynthesis pathway in petals was identified, as well as three genes of LCYE, BCH, and CCD4 on the carotenoid biosynthesis pathway. Furthermore, we discovered that three R2R3-MYBs and one bHLH transcription factors were co-expressed with the expression of different genes. These genes and transcription factors may be responsible for the spatial color difference of P. micranthum. Our study emphasizes that the color of this food-deceptive orchids is achieved through specific genes and transcription factors associated with the pigment biosynthesis pathway.
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Affiliation(s)
- Xinyan Deng
- School of Life Sciences, Guizhou Normal University, Guiyang 550025, China;
- Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China; (C.H.); (C.X.); (A.L.)
| | - Chao Hu
- Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China; (C.H.); (C.X.); (A.L.)
| | - Chengzhi Xie
- Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China; (C.H.); (C.X.); (A.L.)
- College of Forestry, Hainan University, Haikou 570228, China
| | - Aixian Lu
- Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China; (C.H.); (C.X.); (A.L.)
| | - Yibo Luo
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100000, China
- China National Botanical Garden, Beijing 100000, China
| | - Tao Peng
- School of Life Sciences, Guizhou Normal University, Guiyang 550025, China;
| | - Weichang Huang
- Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China; (C.H.); (C.X.); (A.L.)
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15
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Sun A, Wang L, Zhang Y, Yang X, Wei Y, Yang D, Li W, Wu X. Establishment of a triplex TaqMan quantitative real-time PCR assay for simultaneous detection of Cymbidium mosaic virus, Odontoglossum ringspot virus and Cymbidium ringspot virus. Front Microbiol 2023; 14:1129259. [PMID: 37275143 PMCID: PMC10235546 DOI: 10.3389/fmicb.2023.1129259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Accepted: 05/08/2023] [Indexed: 06/07/2023] Open
Abstract
Orchids are significant ornamental plants whose viral infection results in substantial economic damage. Cymbidium mosaic virus (CymMV), Odontoglossum ringspot virus (ORSV), and Cymbidium ringspot virus (CymRSV) represent three important and prevalent orchid viruses. The detection system proposed in this study uses a triplex TaqMan quantitative real-time PCR assay to identify CymMV, ORSV, and CymRSV in a simultaneous manner. We designed specific primers and probes for CymMV, ORSV, and CymRSV, with amplified sequences of 156 bp, 148 bp, and 145 bp, respectively. The minimum detection limit of the triplex qRT-PCR assay for CymMV and CymRSV was 1 copy/assay, and the minimum detection limit was 10 copies/assay for ORSV. The minimum stable detection limits for CymMV, ORSV, and CymRSV were 10, 102, and 102 copies/assay, respectively. Therefore, this system exhibited higher sensitivity (approximately 10 to 104-fold) than RT-PCR. The intra-and interassay CVs of Cq values are less than 0.55 and 0.95%, respectively, indicating that the triplex assay is highly reliable and accurate. In addition, 66 samples from five different orchid genera were analyzed using the established assay and gene chip. The detection results demonstrated that the triplex probe qRT-PCR demonstrated higher sensitivity than the gene chip, indicating that the triplex real-time PCR assay could be used for the detection of field samples. Our findings suggest that the triplex real-time RT-PCR detection system represents a rapid, simple, and accurate tool for detecting CymMV, ORSV, and CymRSV on orchids.
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Affiliation(s)
- Aiqing Sun
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
- Yunnan University, Kunming, Yunnan, China
| | - Lihua Wang
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
| | - Yiping Zhang
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
| | - Xiumei Yang
- Flower Research Institute, Yunnan Agriculture Academy of Science Kunming, Kunming, Yunnan, China
| | - Yi Wei
- Yunnan University, Kunming, Yunnan, China
| | - Dong Yang
- Yunnan University, Kunming, Yunnan, China
| | - Wenhan Li
- Yunnan University, Kunming, Yunnan, China
| | - Xuewei Wu
- Yunnan University, Kunming, Yunnan, China
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16
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Zhang G, Hu Y, Huang MZ, Huang WC, Liu DK, Zhang D, Hu H, Downing JL, Liu ZJ, Ma H. Comprehensive phylogenetic analyses of Orchidaceae using nuclear genes and evolutionary insights into epiphytism. J Integr Plant Biol 2023; 65:1204-1225. [PMID: 36738233 DOI: 10.1111/jipb.13462] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 02/03/2023] [Indexed: 05/13/2023]
Abstract
Orchidaceae (with >28,000 orchid species) are one of the two largest plant families, with economically and ecologically important species, and occupy global and diverse niches with primary distribution in rainforests. Among orchids, 70% grow on other plants as epiphytes; epiphytes contribute up to ~50% of the plant diversity in rainforests and provide food and shelter for diverse animals and microbes, thereby contributing to the health of these ecosystems. Orchids account for over two-thirds of vascular epiphytes and provide an excellent model for studying evolution of epiphytism. Extensive phylogenetic studies of Orchidaceae and subgroups have ;been crucial for understanding relationships among many orchid lineages, although some uncertainties remain. For example, in the largest subfamily Epidendroideae with nearly all epiphytic orchids, relationships among some tribes and many subtribes are still controversial, hampering evolutionary analyses of epiphytism. Here we obtained 1,450 low-copy nuclear genes from 610 orchid species, including 431 with newly generated transcriptomes, and used them for the reconstruction of robust Orchidaceae phylogenetic trees with highly supported placements of tribes and subtribes. We also provide generally well-supported phylogenetic placements of 131 genera and 437 species that were not sampled by previous plastid and nuclear phylogenomic studies. Molecular clock analyses estimated the Orchidaceae origin at ~132 million years ago (Ma) and divergences of most subtribes from 52 to 29 Ma. Character reconstruction supports at least 14 parallel origins of epiphytism; one such origin was placed at the most recent common ancestor of ~95% of epiphytic orchids and linked to modern rainforests. Ten occurrences of rapid increase in the diversification rate were detected within Epidendroideae near and after the K-Pg boundary, contributing to ~80% of the Orchidaceae diversity. This study provides a robust and the largest family-wide Orchidaceae nuclear phylogenetic tree thus far and new insights into the evolution of epiphytism in vascular plants.
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Affiliation(s)
- Guojin Zhang
- Department of Biology, 510 Mueller Laboratory, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Yi Hu
- Department of Biology, 510 Mueller Laboratory, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
| | - Ming-Zhong Huang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Wei-Chang Huang
- Shanghai Chenshan Botanical Garden, Songjiang, Shanghai, 201602, China
| | - Ding-Kun Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Diyang Zhang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Haihua Hu
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China
| | - Jason L Downing
- Fairchild Tropical Botanic Garden, Coral Gables, Florida, 33156, USA
| | - Zhong-Jian Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Hong Ma
- Department of Biology, 510 Mueller Laboratory, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, Pennsylvania, 16802, USA
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Anghelescu NE, Balogh M, Balogh L, Kigyossy N, Georgescu MI, Petra SA, Toma F, Peticilă AG. Epipactis bucegensis-A Separate Autogamous Species within the E. helleborine Alliance. Plants (Basel) 2023; 12:plants12091761. [PMID: 37176819 PMCID: PMC10180920 DOI: 10.3390/plants12091761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 05/15/2023]
Abstract
A new species of Epipactis from Bucegi Natural Park ROSCI0013, Southern Carpathians, Central Romania is described. Three medium-sized populations of Epipactis bucegensis (65-70 individuals in total) were discovered in the south-eastern, subalpine area of the park. To properly describe and distinguish the newly found taxon from other Romanian Epipactis, 37 morphological characters were measured directly from living plants and flowers. Moreover, a detailed taxonomic treatment and description with corresponding colour photos and line drawings illustrations of the holotype are also included. Epipactis bucegensis is an obligate autogamous species that partially resembles Epipactis muelleri, from which it differs in the basal distribution of leaves on the stem (vs. median distribution); near-erect leaf posture (vs. horizontally spread, arched downwards); lanceolate-acuminate, yellowish-green leaves (vs. oval-elongate, vivid-green leaves); bipartite labellum lacking the mesochile (vs. tripartite labellum); crimson-red, wide, ovoid-elongated, flattened hypochile (vs. dark-brown to black roundish hypochile); triangular, white epichile with a sharply tapering apex (vs. heart-shaped, greenish-yellow epichile with obtuse, roundish apex); and two wide-apart, purple, pyramidal calli (vs. two closely placed, attenuated, mildly wrinkled, greenish-yellow calli). Epipactis bucegensis is easily distinguished from all other European Epipactis taxa by the bipartite, wide labellum that lacks the mesochile. In addition, information regarding its distribution (maps), habitat, ecology, phenology and IUCN conservation assessments are provided.
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Affiliation(s)
- Nora E Anghelescu
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Mărăști Blvd, District 1, 011464 Bucharest, Romania
| | - Mihaela Balogh
- Association "Comori de pe Valea Prahovei", 2 Avram Iancu St., 106100 Sinaia, Romania
| | - Lori Balogh
- Association "Comori de pe Valea Prahovei", 2 Avram Iancu St., 106100 Sinaia, Romania
| | - Nicoleta Kigyossy
- Association "Comori de pe Valea Prahovei", 2 Avram Iancu St., 106100 Sinaia, Romania
| | - Mihaela I Georgescu
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Mărăști Blvd, District 1, 011464 Bucharest, Romania
| | - Sorina A Petra
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Mărăști Blvd, District 1, 011464 Bucharest, Romania
| | - Florin Toma
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Mărăști Blvd, District 1, 011464 Bucharest, Romania
| | - Adrian G Peticilă
- Faculty of Horticulture, University of Agronomic Sciences and Veterinary Medicine of Bucharest, 59 Mărăști Blvd, District 1, 011464 Bucharest, Romania
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18
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Kaur J, Harder CB, Sharma J. Congeneric temperate orchids recruit similar-yet differentially abundant-endophytic bacterial communities that are uncoupled from soil, but linked to host phenology and population size. Am J Bot 2023; 110:e16168. [PMID: 37052191 DOI: 10.1002/ajb2.16168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 03/20/2023] [Accepted: 03/20/2023] [Indexed: 05/16/2023]
Abstract
PREMISE Besides the beneficial plant-fungus symbiosis in mycorrhizal plants, bacteria also enhance plant fitness via tripartite interactions. While bacterial associations are presumably just as important for the obligate mycorrhizal family Orchidaceae, little is known about orchid associating bacteria (OAB). METHODS We examined the OAB communities of two, congeneric, terrestrial orchids, Platanthera cooperi and Platanthera praeclara, which represent widely disparate North American ecosystems. We tested whether they recruit distinct OAB communities, and whether variability in OAB communities can be linked to phenology, population size, or habitat soil. Genomic DNAs from roots of seedling, vegetative, and reproductive plants and from soil were subjected to Illumina sequencing of V4 and V5 regions of the 16S rRNA gene. RESULTS We obtained 809 OAB Zero-radius Operational Taxonomic Units (ZOTUs). Despite an overlap of 209 ZOTUs that accounted for >75% relative abundances of their respective OAB communities, the overall community structures of the two orchids were distinct. Within each orchid, distinctions were detected in the OAB communities of large and small populations and the three phenological stages. The OAB ZOTUs were either absent or present with low abundances in soil associated with both orchids. CONCLUSIONS The two orchids exhibited preferential recruitment of known growth-promoting OAB communities from soil. Their OAB communities also showed considerable overlap despite the large environmental and geographical separation of the two host taxa. Our results lend further support to the emerging evidence that not only the fungi, but root-associated bacteria also have functional importance for orchid ecology.
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Affiliation(s)
- Jaspreet Kaur
- Department of Plant and Soil Science, Texas Tech University, Lubbock, Texas, USA
- Department of Biology, University of Wisconsin-La Crosse, La Crosse, Wisconsin, USA
| | - Christoffer B Harder
- Department of Plant and Soil Science, Texas Tech University, Lubbock, Texas, USA
- Department of Biology, MEMEG, Lund University, Ekologihuset, Sölvegatan, Sweden
- Department of Biology, Section of Terrestrial Ecology, University of Copenhagen, Copenhagen, Denmark
| | - Jyotsna Sharma
- Department of Plant and Soil Science, Texas Tech University, Lubbock, Texas, USA
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Nongdam P, Beleski DG, Tikendra L, Dey A, Varte V, EL Merzougui S, Pereira VM, Barros PR, Vendrame WA. Orchid Micropropagation Using Conventional Semi-Solid and Temporary Immersion Systems: A Review. Plants (Basel) 2023; 12:1136. [PMID: 36904000 PMCID: PMC10005664 DOI: 10.3390/plants12051136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 02/22/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
Orchids, with their astonishingly stunning flowers, dominate the international floricultural market. They are considered prized assets for commercial applications in pharmaceutical and floricultural industries as they possess high therapeutic properties and superior ornamental values. The alarming depletion of orchid resources due to excessive unregulated commercial collection and mass habitat destruction makes orchid conservation measures an extreme priority. Conventional propagation methods cannot produce adequate number of orchids, which would meet the requirement of these ornamental plants for commercial and conservational purposes. In vitro orchid propagation using semi-solid media offers an outstanding prospect of rapidly producing quality plants on a large scale. However, the semi-solid (SS) system has shortcomings with low multiplication rates and high production costs. Orchid micropropagation using a temporary immersion system (TIS) overcomes the limitations of the SS system by reducing production costs and making scaleup and full automation possible for mass plant production. The current review highlights different aspects of in vitro orchid propagation using SS and TIS and their benefits and drawbacks on rapid plant generation.
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Affiliation(s)
- Potshangbam Nongdam
- Department of Biotechnology, Manipur University, Canchipur 795003, India
- Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, USA
| | - David G. Beleski
- Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, USA
| | | | - Abhijit Dey
- Department of Life Sciences, Presidency University, Kolkata 700073, India
| | - Vanlalrinchhani Varte
- Department of Molecular Reproduction, Development and Genetics, Indian Institute of Science, Bangalore 560012, India
| | - Soumaya EL Merzougui
- Laboratory of Biotechnologies and Valorization of Natural Resources, Department of Biology, Faculty of Sciences, Ibn Zohr University, Agadir 80000, Morocco
| | - Vania M. Pereira
- Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, USA
| | - Patricia R. Barros
- Department of Soil, Federal University of Vicosa, Vicosa 36570-900, Brazil
| | - Wagner A. Vendrame
- Environmental Horticulture Department, University of Florida, Gainesville, FL 32611, USA
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Vishwakarma SK, Singh N, Kumaria S. Genome-wide identification and analysis of the PAL genes from the orchids Apostasia shenzhenica, Dendrobium catenatum and Phalaenopsis equestris. J Biomol Struct Dyn 2023; 41:1295-1308. [PMID: 34963417 DOI: 10.1080/07391102.2021.2019120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Phenylalanine ammonia-lyase (PAL) is a key gateway enzyme that connects the phenylpropanoid pathway to primary metabolism. The phenylpropanoid pathway plays a vital role in the growth and environmental adaptation of many plants leading to the production of valuable bioactive compounds with industrial and medical applications. In the present study, nine putative PAL genes from three orchids were identified; five in Apostasia shenzhenica and two each in Dendrobium catenatum and Phalaenopsis equestris. Eighteen motifs and four major conserved functional domains were identified as reported in PAL proteins of other species. All the nine PALs were stable based on their computed physicochemical properties and localized in the cytoplasm. The three-dimensional structures of PALs revealed a homo-tetrameric structure consisting of four identical subunits. A total of 21 cis-regulatory elements with known functions were identified from the promoter regions of all PALs which are responsible for various plant responses to light, stress and growth regulators like auxins, gibberellins and abscisic acid. Phylogenetic analysis showed that the studied PAL proteins clustered in two major clades (clade I and II), placing dicot and monocot PALs in two separate monophyletic clades. In silico gene expression of the identified PALs in different vegetative and reproductive tissues revealed the differential expressions based on tissue type and disclosed that the expression of PAL genes was upregulated in all the tissues examined with an exception of PePAL leaf samples where no expression was detected, however, the same being highly expressed in reproductive tissues (PePAL1-labellum; PePAL2-sepal). In case of AsPALs, the expression was found to be highest in reproductive tissues (AsPAL4-maximum in inflorescence). On the other hand, the expression of DcPALs was found to be highest in vegetative tissues (DcPAL2-maximum in root). Based on the medicinal importance of orchids and the significant role of PAL genes in synthesis of bioactive compounds, the functional characterization of PAL genes can be further exploited in genetic improvement of medicinal orchids.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Santosh Kumar Vishwakarma
- Plant Biotechnology Laboratory, Department of Botany, North-Eastern Hill University, Shillong, Meghalaya, India.,Bioinformatics Centre, North-Eastern Hill University, Shillong, Meghalaya, India
| | - Nutan Singh
- Plant Biotechnology Laboratory, Department of Botany, North-Eastern Hill University, Shillong, Meghalaya, India
| | - Suman Kumaria
- Plant Biotechnology Laboratory, Department of Botany, North-Eastern Hill University, Shillong, Meghalaya, India
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21
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Lipińska MM, Haliński ŁP, Gołębiowski M, Kowalkowska AK. Active Compounds with Medicinal Potential Found in Maxillariinae Benth. (Orchidaceae Juss.) Representatives-A Review. Int J Mol Sci 2023; 24:ijms24010739. [PMID: 36614181 PMCID: PMC9821772 DOI: 10.3390/ijms24010739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/19/2022] [Accepted: 12/20/2022] [Indexed: 01/04/2023] Open
Abstract
Orchids are widely used in traditional medicine for the treatment of a whole range of different health conditions, and representatives of the Neotropical subtribe Maxillariinae are not an exception. They are utilized, for instance, for their spasmolytic and anti-inflammatory activities. In this work, we analyze the literature concerning the chemical composition of the plant extracts and secretions of this subtribe's representatives published between 1991 and 2022. Maxillariinae is one of the biggest taxa within the orchid family; however, to date, only 19 species have been investigated in this regard and, as we report, they produce 62 semiochemicals of medical potential. The presented review is the first summary of biologically active compounds found in Maxillariinae.
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Affiliation(s)
- Monika M. Lipińska
- Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdansk, Poland
- Foundation Polish Orchid Association, 81-825 Sopot, Poland
- Correspondence:
| | - Łukasz P. Haliński
- Laboratory of Analysis of Natural Compounds, Department of Environmental Analytics, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Marek Gołębiowski
- Laboratory of Analysis of Natural Compounds, Department of Environmental Analytics, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdansk, Poland
| | - Agnieszka K. Kowalkowska
- Department of Plant Cytology and Embryology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdansk, Poland
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22
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Yadav A, Mudoi KD, Kumar N, Geed SR, Gogoi P, Sharma RK, Saikia R. Auxin biosynthesis by Microbacterium testaceum Y411 associated with orchid aerial roots and their efficacy in micropropagation. Front Plant Sci 2022; 13:1037109. [PMID: 36518501 PMCID: PMC9742431 DOI: 10.3389/fpls.2022.1037109] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 11/02/2022] [Indexed: 06/16/2023]
Abstract
Root-associated bacteria strongly affect plant growth and development by synthesizing growth regulators and stress-relieving metabolites. The present study is mainly focused on assessing aerial root-associated bacteria of Rhynchostylis retusa (L.) Blume is an endemic epiphytic orchid responsible for auxin production and influencing plant growth. A bacterial isolate, Microbacterium testaceum Y411, was found to be the most active producer of indole-3-acetic acid (IAA). The maximum IAA production (170µg/mL) was recorded with the bacterium at optimum process parameters such as pH 7, temperature 30°C, and tryptophan 1000 µg/mL in a culture medium for 48 h. The extracted auxin was purified and analyzed by FT-IR, HPLC, and HR-MS, indicating bacterial auxin has a similar mass value to 4-chloroindole-3-acetic acid auxin. Furthermore, the bacterial auxin was tested on in vitro propagation of orchid, Cymbidium aloifolium, and 90% seed germination was recorded in Murashige and Skoog's medium supplemented with bacterial auxin. The novel results obtained in this study are used for agricultural applications and the Microbacterium testaceum Y411 is a valuable biotechnological resource for a natural auxin.
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Affiliation(s)
- Archana Yadav
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
- Department of Applied Biology, University of Science and Technology, Meghalaya, India
| | - Kalpataru Dutta Mudoi
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Niraj Kumar
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Sachin Rameshrao Geed
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Parishmita Gogoi
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
| | - Rabin K. Sharma
- Department of Applied Biology, University of Science and Technology, Meghalaya, India
| | - Ratul Saikia
- Microbial Biotechnology Laboratory, Biological Sciences and Technology Division, Council of Scientific & Industrial Research (CSIR)-North East Institute of Science and Technology, Jorhat, Assam, India
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Sherpa R, Devadas R, Bolbhat SN, Nikam TD, Penna S. Gamma Radiation Induced In-Vitro Mutagenesis and Isolation of Mutants for Early Flowering and Phytomorphological Variations in Dendrobium 'Emma White'. Plants (Basel) 2022; 11:plants11223168. [PMID: 36432897 PMCID: PMC9697006 DOI: 10.3390/plants11223168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 11/11/2022] [Accepted: 11/15/2022] [Indexed: 05/31/2023]
Abstract
In vitro mutagenesis offers a feasible approach for developing new orchid cultivars through genetic manipulation. In the present study, protocorm-like bodies (PLBs) were exposed to gamma rays (10, 20, 40, 60, 80 Gy) to study in vitro growth responses and induction of mutants in Dendrobium ‘Emma White’. Both proliferation and regeneration of PLBs decreased progressively with increasing doses, except for a significantly enhanced growth response at 10 Gy. The optimal dose of gamma radiation for mutagenesis was found in the range 10 to 25 Gy based on the growth reduction curve. Analysis using a high-throughput cell analyzer revealed a significant reduction in nuclear DNA content at > 40 Gy doses. At 10 Gy treatment, the growth attributes, such as root length, plant height and leaf number, were significantly increased by 36%, 26% and 20%, respectively, compared to the control. This increase was significant over other tested doses as well. Testing of random amplified polymorphic DNA markers revealed the presence of detectable polymorphism among gamma mutant plantlets with a polymorphism information content value at 0.41. The gamma-ray-induced earliness in flower development was observed within 294 days post ex vitro growth of 10 Gy mutant compared to the control plants flowered after 959 days. Our results highlight the significance of gamma radiation in inducing enhanced growth, morphological variations and early floral initiation in Dendrobium, providing a basic framework for mutation breeding and improvement of orchids.
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Affiliation(s)
- Rubina Sherpa
- Department of Botany, Annasaheb Awate College, Manchar 410503, India
- Indian Council of Agricultural Research-National Research Centre on Orchids, Pakyong 737106, India
| | - Ramgopal Devadas
- Indian Council of Agricultural Research-National Research Centre on Orchids, Pakyong 737106, India
| | | | | | - Suprasanna Penna
- Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- Amity Institute of Biotechnology, Amity University Mumbai, Mumbai 410206, India
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24
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Olivares-Juárez MI, Burgos-Hernández M, Santiago-Alvarádo M. Patterns of Species Richness and Distribution of the Genus Laelia s.l. vs. Laelia s.s. (Laeliinae: Epidendroideae: Orchidaceae) in Mexico: Taxonomic Contribution and Conservation Implications. Plants (Basel) 2022; 11:2742. [PMID: 36297766 PMCID: PMC9609499 DOI: 10.3390/plants11202742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 10/11/2022] [Accepted: 10/11/2022] [Indexed: 06/16/2023]
Abstract
Laelia is an endemic genus of the neotropical region, with the greatest richness occurring in Mexico. A recent phylogenetic study transferred some Mexican laelias to the genus Schomburgkia, which has generated debate. The aim of the present study was to analyze the patterns of species richness and endemism and the current and potential geographic distributions of the taxa of Laelia s.l., as well as the putative Laelia s.s., distributed in Mexico as part of an exploratory evaluation of the generic limits to sheds light on the taxonomic debate and generate baselines to guide conservation efforts. A database was generated with information from herbarium specimens and publications. The species richness was estimated by political division, biomes, and elevation. The endemism was analyzed by political division and using the weighted and corrected weighted endemism indices. Geographic data, climatic, and topographic variables were used to predict the distributions with the maximum entropy algorithm. The results supported the proposal to transfer some species to the genus Schomburgkia. Some areas of the Sierra Madre del Sur and Oriental should be included as priority areas in the conservation strategies of Laelia. This study highlights the importance of the taxonomy, distribution, and hotspots in diversity conservation.
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Affiliation(s)
- Ma. Isabel Olivares-Juárez
- Departamento de Biología, Universidad Autónoma Metropolitana, Unidad Iztapalapa, Av. San Rafael Atlixco 186, Leyes de Reforma, 1ra sección, Iztapalapa, Mexico City 09340, Mexico
| | - Mireya Burgos-Hernández
- Programa de Posgrado en Botánica, Colegio de Postgraduados, Km 36.5 carretera Mexico-Texcoco, Montecillo, Texcoco 56230, Mexico
| | - Margarita Santiago-Alvarádo
- Laboratorio de Biología Comparada, Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Batalla 5 de mayo sn, Ejercito de Oriente, Iztapalapa, Mexico City 09230, Mexico
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25
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Liang J, Zou R, Huang Y, Qin H, Tang J, Wei X, Liang Y, Chai S. Structure and diversity of mycorrhizal fungi communities of different part of Bulbophyllum tianguii in three terrestrial environments. Front Plant Sci 2022; 13:992184. [PMID: 36275522 PMCID: PMC9579349 DOI: 10.3389/fpls.2022.992184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 09/20/2022] [Indexed: 06/16/2023]
Abstract
Mycorrhizal fungi plays important roles in the seed germination and subsequent growth of orchids. The research of fungi in orchid roots, especially dominant mycorrhizal fungi is critical for orchids protection. In this study, the fungal community and composition of mycorrhizal fungi in roots, rhizomes and rhizosphere soil of Bulbophyllum tianguii grown in three terrestrial environments were analyzed by the second generation sequencing technology. The results of OTU clustering and α and β diversity analysis showed that there were significant differences in fungal communities in roots, rhizomes and rhizosphere soil of B. tianguii. The total number of OTUs in rhizomes was much less than that in roots and rhizosphere soil. The number of OTUs in rhizosphere soil and the diversity of mycorrhizal fungi were the highest. Meanwhile, the species and abundance of mycorrhizal fungi in roots and rhizomes of B. tianguii were different from those in rhizosphere soil. For different elevations, compared with B. tianguii that grow in middle of Tiankeng and top of Tiankeng, the OTUs number of B. tianguii in orchid garden is richest, and the diversity of mycorrhizal fungi in orchid garden was significantly higher than other locations. Among the three different habitats of B. tianguii, the number of OTUs in humus soil and stone habitats was notably higher than tree habitats, and the diversity of mycorrhizal fungi in humus soil was the highest. The analysis of mycorrhizal fungi in different habitats and altitudes of B. tianguii showed that Sebacina and Exophiala were the dominant mycorrhizal fungi in B. tianguii. The results of species annotation, phylogenetic tree and co-occurrence network analysis showed the dominant mycorrhizal fungi of B. tianguii mainly included Sebacina, Cladosporium, Exophiala, Fusarium. This study reveals the symbiotic relationship between Sebacina, Exophiala, Cladosporium and the B. Tianguii. It will provide a theoretical basis for the protection and biological function study of B. Tianguii.
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Affiliation(s)
- Jiayu Liang
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, (Guangxi Normal University), Ministry of Education, Guilin, China
- Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, College of Life Science, Guangxi Normal University, Guilin, China
| | - Rong Zou
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, the Chinese Academy of Sciences, Guilin, China
| | - Yang Huang
- School of Mechanical and Electrical Engineering, Guilin University of Electronic Technology, Guilin, China
| | - Huizhen Qin
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, the Chinese Academy of Sciences, Guilin, China
| | - Jianmin Tang
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, the Chinese Academy of Sciences, Guilin, China
| | - Xiao Wei
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, the Chinese Academy of Sciences, Guilin, China
| | - Yu Liang
- Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, (Guangxi Normal University), Ministry of Education, Guilin, China
- Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, College of Life Science, Guangxi Normal University, Guilin, China
| | - Shengfeng Chai
- Guangxi Key Laboratory of Plant Functional Phytochemicals and Sustainable Utilization, Guangxi Institute of Botany, the Chinese Academy of Sciences, Guilin, China
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26
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Casique JV, Soares MVB, da Silva EF, Kikuchi TY, Andrade EHDA, Mastroberti AA. Coryanthes macrantha (Orchidaceae: Stanhopeinae) and their floral and extrafloral secretory structures: an anatomical and phytochemical approach. AoB Plants 2022; 14:plac039. [PMID: 36196392 PMCID: PMC9525647 DOI: 10.1093/aobpla/plac039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Accepted: 09/01/2022] [Indexed: 06/16/2023]
Abstract
Coryanthes is one of the most fascinating genera of Stanhopeinae (Orchidaceae) because of its complex pollination mechanism and the peculiar structures of its flowers. Although Coryanthes macrantha is widely studied, investigation of the secretory structures and floral biology is important to understand the mechanisms and ecology of pollination, which deserve attention despite the difficulties of collecting fertile material in nature. We conducted a morpho-anatomical analysis of the floral and extrafloral secretory structures of C. macrantha to better understand the secretory structures, contribute to the knowledge of its floral biology and/or pollination processes and understand the ecological function of these structures. The analysis revealed that C. macrantha has epidermal osmophores with unicellular papillae that were foraged by male Eulaema bees, floral nectaries in the sepals and extrafloral nectaries in the bracts. In both the floral and extrafloral nectaries, the nectar is exuded by the stomata. Azteca ants foraged the bract and sepal nectaries in pre-anthesis and post-anthesis. We also described the secretory epidermis of pleuridia, and the mode of secretion of osmophores and nectaries and found that they attract specific foraging agents.
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Affiliation(s)
- Jorgeane Valéria Casique
- Programa de Pós-graduação em Botânica, Departamento de Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - Marcos Vinícius Batista Soares
- Programa de Pós-graduação em Botânica, Departamento de Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
| | - Edilson Freitas da Silva
- Programa de Pós-Graduação em Biodiversidade (Bionorte), Departamento de Botânica, Museu Paraense Emílio Goeldi, Belém, PA 66077-830, Brazil
| | - Tatiani Yuriko Kikuchi
- Instituto de Botânica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ 21941-901, Brazil
| | - Eloisa Helena de Aguiar Andrade
- Programa de Pós-Graduação em Biodiversidade (Bionorte), Departamento de Botânica, Museu Paraense Emílio Goeldi, Belém, PA 66077-830, Brazil
| | - Alexandra Antunes Mastroberti
- Programa de Pós-graduação em Botânica, Departamento de Botânica, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 91501-970, Brazil
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27
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Wang J, Li J, Lin W, Deng B, Lin L, Lv X, Hu Q, Liu K, Fatima M, He B, Qiu D, Ma X. Genome-wide identification and adaptive evolution of CesA/Csl superfamily among species with different life forms in Orchidaceae. Front Plant Sci 2022; 13:994679. [PMID: 36247544 PMCID: PMC9559377 DOI: 10.3389/fpls.2022.994679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Accepted: 08/26/2022] [Indexed: 06/16/2023]
Abstract
Orchidaceae, with more than 25,000 species, is one of the largest flowering plant families that can successfully colonize wide ecological niches, such as land, trees, or rocks, and its members are divided into epiphytic, terrestrial, and saprophytic types according to their life forms. Cellulose synthase (CesA) and cellulose synthase-like (Csl) genes are key regulators in the synthesis of plant cell wall polysaccharides, which play an important role in the adaptation of orchids to resist abiotic stresses, such as drought and cold. In this study, nine whole-genome sequenced orchid species with three types of life forms were selected; the CesA/Csl gene family was identified; the evolutionary roles and expression patterns of CesA/Csl genes adapted to different life forms and abiotic stresses were investigated. The CesA/Csl genes of nine orchid species were divided into eight subfamilies: CesA and CslA/B/C/D/E/G/H, among which the CslD subfamily had the highest number of genes, followed by CesA, whereas CslB subfamily had the least number of genes. Expansion of the CesA/Csl gene family in orchids mainly occurred in the CslD and CslF subfamilies. Conserved domain analysis revealed that eight subfamilies were conserved with variations in orchids. In total, 17 pairs of CesA/Csl homologous genes underwent positive selection, of which 86%, 14%, and none belonged to the epiphytic, terrestrial, and saprophytic orchids, respectively. The inter-species collinearity analysis showed that the CslD genes expanded in epiphytic orchids. Compared with terrestrial and saprophytic orchids, epiphytic orchids experienced greater strength of positive selection, with expansion events mostly related to the CslD subfamily, which might have resulted in strong adaptability to stress in epiphytes. Experiments on stem expression changes under abiotic stress showed that the CslA might be a key subfamily in response to drought stress for orchids with different life forms, whereas the CslD might be a key subfamily in epiphytic and saprophytic orchids to adapt to freezing stress. This study provides the basic knowledge for the further systematic study of the adaptive evolution of the CesA/Csl superfamily in angiosperms with different life forms, and research on orchid-specific functional genes related to life-history trait evolution.
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Affiliation(s)
- Jingjing Wang
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jing Li
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Wei Lin
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ban Deng
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Lixian Lin
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xuanrui Lv
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Qilin Hu
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Kunpeng Liu
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Mahpara Fatima
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Bizhu He
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Orchid Conservation and Utilization of National Forestry and Grassland Administration at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Dongliang Qiu
- College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiaokai Ma
- Center for Genomics and Biotechnology, School of Future Technology, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of Orchid Conservation and Utilization of National Forestry and Grassland Administration at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
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Chen J, Bi YY, Wang QQ, Liu DK, Zhang D, Ding X, Liu ZJ, Chen SP. Genome-wide identification and analysis of anthocyanin synthesis-related R2R3-MYB genes in Cymbidium goeringii. Front Plant Sci 2022; 13:1002043. [PMID: 36247626 PMCID: PMC9554442 DOI: 10.3389/fpls.2022.1002043] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 08/29/2022] [Indexed: 06/16/2023]
Abstract
The MYB gene family plays a vital regulatory role in plant metabolism, stress response, and floral color. The R2R3-MYB gene family of C. goeringii was identified, and its expression was analyzed using bioinformatics in this article. The R2R3-MYB genes of Arabidopsis thaliana were used as a reference to determine 104 CgMYB genes and categorize them into 22 subfamilies. Exon/intron organizations and conserved motif analysis revealed that the majority of CgMYB genes were highly conserved, and chromosome localization and collinearity analysis provided evidence of tandem duplication and segmental duplication events, indicating the phenomenon of gene family expansion and contraction. The function of CgMYB genes was analyzed by cis-acting element and gene ontology (GO) enrichment. In addition, we selected CgMYB91 and CgMYB32 for RT-qPCR, suggesting that CgMYB91 and CgMYB32 are associated with anthocyanin formation. In short, this study provides a comprehensive and specific function of the R2R3-MYB transcription factors (TFs) in orchids.
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Affiliation(s)
- Jiating Chen
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuan-Yang Bi
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Qian-Qian Wang
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ding-Kun Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Diyang Zhang
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xiangqing Ding
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhong-Jian Liu
- College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Shi-Pin Chen
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
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29
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Ahmad S, Chen G, Huang J, Yang K, Hao Y, Zhou Y, Zhao K, Lan S, Liu Z, Peng D. Beauty and the pathogens: A leaf-less control presents a better image of Cymbidium orchids defense strategy. Front Plant Sci 2022; 13:1001427. [PMID: 36176684 PMCID: PMC9513425 DOI: 10.3389/fpls.2022.1001427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 08/16/2022] [Indexed: 06/16/2023]
Abstract
Biological control is a safe way of combating plant diseases using the living organisms. For the precise use of microbial biological control agents, the genetic information on the hypersensitive response (HR), and defense-related gene induction pathways of plants are necessary. Orchids are the most prominent stakeholders of floriculture industry, and owing to their long-awaited flowering pattern, disease control is imperative to allow healthy vegetative growth that spans more than 2 years in most of the orchids. We observed leaf-less flowering in three orchid species (Cymbidium ensifolium, C. goeringii and C. sinense). Using these materials as reference, we performed transcriptome profiling for healthy leaves from non-infected plants to identify genes specifically involved in plant-pathogen interaction pathway. For this pathway, a total of 253 differentially expressed genes (DEGs) were identified in C. ensifolium, 189 DEGs were identified in C. goeringii and 119 DEGs were found in C. sinense. These DEGs were mainly related to bacterial secretion systems, FLS2, CNGCs and EFR, regulating HR, stomatal closure and defense-related gene induction. FLS2 (LRR receptor-like serine/threonine kinase) contained the highest number of DEGs among three orchid species, followed by calmodulin. Highly upregulated gene sets were found in C. sinense as compared to other species. The great deal of DEGs, mainly the FLS2 and EFR families, related to defense and immunity responses can effectively direct the future of biological control of diseases for orchids.
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Affiliation(s)
- Sagheer Ahmad
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Guizhen Chen
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jie Huang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Kang Yang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yang Hao
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuzhen Zhou
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Kai Zhao
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Life Sciences, Fujian Normal University, Fuzhou, China
| | - Siren Lan
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhongjian Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Donghui Peng
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
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Melzer R. Flowering Newsletter 2022. J Exp Bot 2022; 73:4605-4607. [PMID: 35950461 PMCID: PMC9366318 DOI: 10.1093/jxb/erac269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
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Kaur A, Ghai D, Yadav VG, Pawar SV, Sembi JK. Polyketide synthases (PKSs) of secondary metabolism: in silico identification and characterization in orchids. J Biomol Struct Dyn 2022:1-13. [PMID: 35735783 DOI: 10.1080/07391102.2022.2090439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Type III polyketide synthases (PKSs) catalyse the formation of an array of polyketides with diverse structures that play an important role in secondary metabolism in plants. This group of enzymes is encoded by a multigene family, the Type III polyketide synthase (PKS) gene family. Vast reserves of secondary metabolites in orchids make these plants suitable candidates for research in the area. In this study, genome-wide searches lead to the identification of five PeqPKS, eight DcaPKS and six AshPKS genes in Phalaenopsis equestris, Dendrobium catenatum and Apostasia shenzhenica, respectively. All the members showed the presence of two characteristic conserved domains (Chal_sti_synt_N and Chal_sti_synt_C) and were generally localised in the cytoplasm. The phylogenetic analysis led to the classification of these proteins into two groups: CHS (chalcone synthase (CHS) and non-CHS. A single protein in P. equestris and two proteins each in D. catenatum and A. shenzhenica clustered within the CHS clade. The majority of the genes exhibited similar structural patterns with a single intron. Expression profiling revealed the tissue-specific expression of these genes with high expression in reproductive tissues for most genes. A number of stress-responsive cis-regulatory elements were predicted, noteworthy amongst these are, ABRE and CGTCA that are chiefly responsible for responding to abscisic acid and methyl jasmonate, respectively. Our study provides a reference framework for future studies involving functional elucidation of PKS genes and biotechnological production of polyketides.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Arshpreet Kaur
- Department of Botany, Panjab University, Chandigarh, India
| | - Devina Ghai
- Department of Botany, Panjab University, Chandigarh, India
| | - Vikramaditya G Yadav
- Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada.,School of Biomedical Engineering, University of British Columbia, Vancouver, BC, Canada
| | - Sandip V Pawar
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
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Wong DCJ, Peakall R. Orchid Phylotranscriptomics: The Prospects of Repurposing Multi-Tissue Transcriptomes for Phylogenetic Analysis and Beyond. Front Plant Sci 2022; 13:910362. [PMID: 35712597 PMCID: PMC9196242 DOI: 10.3389/fpls.2022.910362] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 04/21/2022] [Indexed: 06/10/2023]
Abstract
The Orchidaceae is rivaled only by the Asteraceae as the largest plant family, with the estimated number of species exceeding 25,000 and encompassing more than 700 genera. To gain insights into the mechanisms driving species diversity across both global and local scales, well-supported phylogenies targeting different taxonomic groups and/or geographical regions will be crucial. High-throughput sequencing technologies have revolutionized the field of molecular phylogenetics by simplifying the process of obtaining genome-scale sequence data. Consequently, there has been an explosive growth of such data in public repositories. Here we took advantage of this unprecedented access to transcriptome data from predominantly non-phylogenetic studies to assess if it can be repurposed to gain rapid and accurate phylogenetic insights across the orchids. Exhaustive searches revealed transcriptomic data for more than 100 orchid species spanning 5 subfamilies, 13 tribes, 21 subtribes, and 50 genera that were amendable for exploratory phylotranscriptomic analysis. Next, we performed re-assembly of the transcriptomes before strategic selection of the final samples based on a gene completeness evaluation. Drawing on these data, we report phylogenetic analyses at both deep and shallow evolutionary scales via maximum likelihood and shortcut coalescent species tree methods. In this perspective, we discuss some key outcomes of this study and conclude by highlighting other complementary, albeit rarely explored, insights beyond phylogenetic analysis that repurposed multi-tissue transcriptome can offer.
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Lanzino M, Palermo AM, Pellegrino G. Pollinaria Reconfiguration Mechanism of Widespread Euro-Mediterranean Orchids: The Effects of Increasing Air Temperature. Plants (Basel) 2022; 11:1327. [PMID: 35631751 PMCID: PMC9145125 DOI: 10.3390/plants11101327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/12/2022] [Accepted: 05/16/2022] [Indexed: 06/15/2023]
Abstract
Orchids are fascinating for many reasons: their reproductive strategies, their pollination systems and the various morphological adaptations they have evolved, including the presence of pollen grains agglomerated into two masses, called pollinia, which form a structure known as a pollinarium. After withdrawal from a flower, the pollinarium undergoes a bending movement such that the pollen masses become correctly orientated to strike the stigma. We evaluated the duration of pollinator visits to inflorescences and the effects of temperature on pollinaria reconfiguration in eight orchid species in order to analyze the effects of increasing air temperature on the changes in bending time, and thus on geitonogamy levels. The impact of temperature on insect behavior was not assessed because our priority was to understand the effects of temperature on the process of pollinaria reconfiguration. All the examined species showed natural reconfiguration times that were 1.7-3.0 times longer than the pollinator residency times. A higher temperature showed a reduction in bending time regardless of the species tested. However, the bending time was never shorter than the residence time of the insects on the flower. Our data showed that high temperatures had a limited effect on the pollinarium reconfiguration time, thus indicating that high temperatures had a limited effect on folding compared to the effect that it had on the viability of the pollen.
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Affiliation(s)
- Micaela Lanzino
- Department of Biology, Ecology and Earth Sciences, University of Calabria, 87036 Rende, Italy
| | - Anna Maria Palermo
- Department of Biology, Ecology and Earth Sciences, University of Calabria, 87036 Rende, Italy
| | - Giuseppe Pellegrino
- Department of Biology, Ecology and Earth Sciences, University of Calabria, 87036 Rende, Italy
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Ghai D, Kaur A, Kahlon PS, Pawar SV, Sembi JK. A Walk Through the Maze of Secondary Metabolism in Orchids: A Transcriptomic Approach. Front Plant Sci 2022; 13:837563. [PMID: 35574139 PMCID: PMC9100589 DOI: 10.3389/fpls.2022.837563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 04/11/2022] [Indexed: 06/15/2023]
Abstract
Orchids have a huge reservoir of secondary metabolites making these plants of immense therapeutic importance. Their potential as curatives has been realized since times immemorial and are extensively studied for their medicinal properties. Secondary metabolism is under stringent genetic control in plants and several molecular factors are involved in regulating the production of the metabolites. However, due to the complex molecular networks, a complete understanding of the specific molecular cues is lacking. High-throughput omics technologies have the potential to fill up this lacuna. The present study deals with comparative analysis of high-throughput transcript data involving gene identification, functional annotation, and differential expression in more than 30 orchid transcriptome data sets, with a focus to elucidate the role of various factors in alkaloid and flavonoid biosynthesis. Comprehensive analysis of the mevalonate (MVA) pathway, methyl-d-erythritol 4-phosphate (MEP) pathway, and phenylpropanoid pathway provide specific insights to the potential gene targets for drug discovery. It is envisaged that a positive stimulation of these pathways through regulation of pivotal genes and alteration of specific gene expression, could facilitate the production of secondary metabolites and enable efficient tapping of the therapeutic potential of orchids. This further would lay the foundation for developing strategies for genetic and epigenetic improvement of these plants for development of therapeutic products.
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Affiliation(s)
- Devina Ghai
- Department of Botany, Panjab University, Chandigarh, India
| | - Arshpreet Kaur
- Department of Botany, Panjab University, Chandigarh, India
| | - Parvinderdeep S. Kahlon
- Chair of Phytopathology, TUM School of Life Sciences, Technical University of Munich, Freising, Germany
| | - Sandip V. Pawar
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
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Wong DCJ, Perkins J, Peakall R. Anthocyanin and Flavonol Glycoside Metabolic Pathways Underpin Floral Color Mimicry and Contrast in a Sexually Deceptive Orchid. Front Plant Sci 2022; 13:860997. [PMID: 35401591 PMCID: PMC8983864 DOI: 10.3389/fpls.2022.860997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 02/17/2022] [Indexed: 06/10/2023]
Abstract
Sexually deceptive plants secure pollination by luring specific male insects as pollinators using a combination of olfactory, visual, and morphological mimicry. Flower color is a key component to this attraction, but its chemical and genetic basis remains poorly understood. Chiloglottis trapeziformis is a sexually deceptive orchid which has predominantly dull green-red flowers except for the central black callus projecting from the labellum lamina. The callus mimics the female of the pollinator and the stark color contrast between the black callus and dull green or red lamina is thought to enhance the visibility of the mimic. The goal of this study was to investigate the chemical composition and genetic regulation of temporal and spatial color patterns leading to visual mimicry, by integrating targeted metabolite profiling and transcriptomic analysis. Even at the very young bud stage, high levels of anthocyanins were detected in the dark callus, with peak accumulation by the mature bud stage. In contrast, anthocyanin levels in the lamina peaked as the buds opened and became reddish-green. Coordinated upregulation of multiple genes, including dihydroflavonol reductase and leucoanthocyanidin dioxygenase, and the downregulation of flavonol synthase genes (FLS) in the callus at the very young bud stage underpins the initial high anthocyanin levels. Conversely, within the lamina, upregulated FLS genes promote flavonol glycoside over anthocyanin production, with the downstream upregulation of flavonoid O-methyltransferase genes further contributing to the accumulation of methylated flavonol glycosides, whose levels peaked in the mature bud stage. Finally, the peak anthocyanin content of the reddish-green lamina of the open flower is underpinned by small increases in gene expression levels and/or differential upregulation in the lamina in select anthocyanin genes while FLS patterns showed little change. Differential expression of candidate genes involved in specific transport, vacuolar acidification, and photosynthetic pathways may also assist in maintaining the distinct callus and contrasting lamina color from the earliest bud stage through to the mature flower. Our findings highlight that flower color in this sexually deceptive orchid is achieved by complex tissue-specific coordinated regulation of genes and biochemical pathways across multiple developmental stages.
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Lipińska MM, Olędrzyńska N, Portilla A, Łuszczek D, Sumbembayev AA, Szlachetko DL. Maxillariaanacatalinaportillae (Orchidaceae, Maxillariinae), a new remarkable species from Ecuador. PhytoKeys 2022; 190:15-33. [PMID: 35437380 PMCID: PMC8873151 DOI: 10.3897/phytokeys.190.77918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 01/26/2022] [Indexed: 06/14/2023]
Abstract
Neotropical genus Maxillaria Ruiz & Pav. belongs to one of the most diverse and species-rich groups of orchids. Several of its representatives are popular, horticultural plants with large and showy flowers, often nicely fragranced. It is not uncommon that some distinctly colored individuals are introduced to the commercial market under names of similar, more or less related species, as informal varieties or color forms, largely causing confusion. While investigating the diversity of Maxillaria in Ecuador, we have encountered plants that were commercially referred to as M.sanderianaxanthina. In the course of conducted morphological and micromorphological analyses, we concluded that it is a new, separate species and hereby, we describe it as M.anacatalinaportillae.
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Affiliation(s)
- Monika M. Lipińska
- Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80–308 Gdańsk, Poland
- Foundation Polish Orchid Association, 81–825 Sopot, Poland
| | - Natalia Olędrzyńska
- Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80–308 Gdańsk, Poland
| | - Alex Portilla
- Géneros Ecuatorianos Ecuagenera Cia. Ltda., Km. 2 1/2 Vía a Cuenca Sector Llampasay, PO Box 01.01.1110 Cuenca, Ecuador
| | - Dorota Łuszczek
- Laboratory of Electron Microscopy, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80–308 Gdańsk, Poland
| | - Aidar A. Sumbembayev
- Altai Botanical Garden, Ridder, Kazakhstan
- Al-FarabiKazakh National University, Almaty, Kazakhstan
| | - Dariusz L. Szlachetko
- Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80–308 Gdańsk, Poland
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Ahmad S, Peng D, Zhou Y, Zhao K. The Genetic and Hormonal Inducers of Continuous Flowering in Orchids: An Emerging View. Cells 2022; 11:657. [PMID: 35203310 DOI: 10.3390/cells11040657] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 02/09/2022] [Accepted: 02/11/2022] [Indexed: 02/07/2023] Open
Abstract
Orchids are the flowers of magnetic beauty. Vivid and attractive flowers with magnificent shapes make them the king of the floriculture industry. However, the long-awaited flowering is a drawback to their market success, and therefore, flowering time regulation is the key to studies about orchid flower development. Although there are some rare orchids with a continuous flowering pattern, the molecular regulatory mechanisms are yet to be elucidated to find applicable solutions to other orchid species. Multiple regulatory pathways, such as photoperiod, vernalization, circadian clock, temperature and hormonal pathways are thought to signalize flower timing using a group of floral integrators. This mini review, thus, organizes the current knowledge of floral time regulators to suggest future perspectives on the continuous flowering mechanism that may help to plan functional studies to induce flowering revolution in precious orchid species.
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Ellwanger C, Steger L, Pollack C, Wells R, Benjamin Fant J. Anthropogenic fragmentation increases risk of genetic decline in the threatened orchid Platanthera leucophaea. Ecol Evol 2022; 12:e8578. [PMID: 35222956 PMCID: PMC8855017 DOI: 10.1002/ece3.8578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 12/24/2021] [Accepted: 01/05/2022] [Indexed: 11/06/2022] Open
Abstract
Protecting biodiversity requires an understanding of how anthropogenic changes impact the genetic processes associated with extinction risk. Studies of the genetic changes due to anthropogenic fragmentation have revealed conflicting results. This is likely due to the difficulty in isolating habitat loss and fragmentation, which can have opposing impacts on genetic parameters. The well-studied orchid, Platanthera leucophaea, provides a rich dataset to address this issue, allowing us to examine range-wide genetic changes. Midwestern and Northeastern United States. We sampled 35 populations of P. leucophaea that spanned the species' range and varied in patch composition, degree of patch isolation, and population size. From these populations we measured genetic parameters associated with increased extinction risk. Using this combined dataset, we modeled landscape variables and population metrics against genetic parameters to determine the best predictors of increased extinction risk. All genetic parameters were strongly associated with population size, while development and patch isolation showed an association with genetic diversity and genetic structure. Genetic diversity was lowest in populations with small census sizes, greater urbanization pressures (habitat loss), and small patch area. All populations showed moderate levels of inbreeding, regardless of size. Contrary to expectation, we found that critically small populations had negative inbreeding values, indicating non-random mating not typically observed in wild populations, which we attribute to selection for less inbred individuals. The once widespread orchid, Platanthera leucophaea, has suffered drastic declines and extant populations show changes in the genetic parameters associated with increased extinction risk, especially smaller populations. Due to the important correlation with risk and habitat loss, we advocate continued monitoring of population sizes by resource managers, while the critically small populations may need additional management to reverse genetic declines.
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Affiliation(s)
- Claire Ellwanger
- Plant Biology and ConservationChicago Botanic GardenGlencoeIllinoisUSA
- Plant Biology and ConservationNorthwestern University, O.T. Hogan HallEvanstonIllinoisUSA
- U.S. Forest ServiceOkanogan‐Wenatchee National ForestWenatcheeWashingtonUSA
| | - Laura Steger
- Plant Biology and ConservationChicago Botanic GardenGlencoeIllinoisUSA
- School of Life SciencesArizona State UniversityTempeArizonaUSA
| | - Cathy Pollack
- U.S. Fish and Wildlife ServiceChicago Field OfficeChicagoIllinoisUSA
| | - Rachel Wells
- Plant Biology and ConservationChicago Botanic GardenGlencoeIllinoisUSA
- Department of BiologyUniversity of LouisvilleLouisvilleKentuckyUSA
| | - Jeremie Benjamin Fant
- Plant Biology and ConservationChicago Botanic GardenGlencoeIllinoisUSA
- Plant Biology and ConservationNorthwestern University, O.T. Hogan HallEvanstonIllinoisUSA
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Śliwiński T, Kowalczyk T, Sitarek P, Kolanowska M. Orchidaceae-Derived Anticancer Agents: A Review. Cancers (Basel) 2022; 14:754. [PMID: 35159021 DOI: 10.3390/cancers14030754] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Revised: 01/28/2022] [Accepted: 01/28/2022] [Indexed: 02/06/2023] Open
Abstract
Simple Summary Orchids are commonly used in folk medicine for the treatment of infections and tumors but little is known about the actual chemical composition of these plants and their anticancer properties. In this paper, the most recent literature on orchid-derived bioactive substances with anticancer properties is reviewed. According to the published data, numerous species of orchids contain potential antitumor chemicals. Still, a relatively insignificant number of species of orchids have been tested for their bioactive properties and most of those studies were on Asian taxa. Broader research, ’including American and African species, as well as the correct identification of samples, is essential for evaluating the usefulness of orchids as a plant family with huge anticancer potential. Abstract Species of orchids, which belong to the largest family of flowering plants, are commonly used in folk medicine for the treatment of infections and tumors. However, little is known about the actual chemical composition of these plants and their anticancer properties. In this paper, the most recent literature on orchid-derived bioactive substances with anticancer properties is reviewed. For the assessment, previous papers on the anticancer activity of Orchidaceae published since 2015 were considered. The papers were found by exploring electronic databases. According to the available data, many species of orchids contain potential antitumor chemicals. The bioactive substances in a relatively insignificant number of orchids are identified, and most studies are on Asian taxa. Broader research on American and African species and the correct identification of samples included in the experiments are essential for evaluating the usefulness of orchids as a plant family with vast anticancer potential.
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Adit A, Singh VK, Koul M, Tandon R. Breeding System and Response of the Pollinator to Floral Larceny and Florivory Define the Reproductive Success in Aerides odorata. Front Plant Sci 2022; 12:767725. [PMID: 35095948 PMCID: PMC8795787 DOI: 10.3389/fpls.2021.767725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 12/16/2021] [Indexed: 06/14/2023]
Abstract
Consumption of pollination reward by felonious means in a plant species can influence the foraging behavior of its pollinator and eventually the reproductive success. So far, studies on this aspect are largely confined to interaction involving plant-pollinators and nectar robbers or thieves. However, a foraging guild in such interactions may also include floral herbivores or florivores. There is a paucity of information on the extent to which nectar larcenists may influence the foraging behavior of the pollinator and reproductive fitness of plants in the presence of a florivore. We investigated various forms of larceny in the natural populations of Aerides odorata, a pollinator-dependent and nectar-rewarding orchid. These populations differed in types of foraging guild, the extent of larceny (thieving/robbing), which can occur with or without florivory, and natural fruit-set pattern. The nectariferous spur of the flower serves as an organ of interest among the foraging insects. While florivory marked by excision of nectary dissuades the pollinator, nectar thieving and robbing significantly enhance visits of the pollinator and fruit-set. Experimental pollinations showed that the species is a preferential outbreeder and experiences inbreeding depression from selfing. Reproductive fitness of the orchid species varies significantly with the extent of floral larceny. Although nectar thieving or robbing is beneficial in this self-compatible species, the negative effects of florivory were stronger. Our findings suggest that net reproductive fitness in the affected plant species is determined by the overarching effect of its breeding system on the overall interacting framework of the foraging guild.
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Affiliation(s)
- Arjun Adit
- Department of Botany, University of Delhi, New Delhi, India
| | - Vineet Kumar Singh
- Department of Botany, Acharya Narendra Dev College, University of Delhi, New Delhi, India
| | - Monika Koul
- Department of Botany, Hans Raj College, University of Delhi, New Delhi, India
| | - Rajesh Tandon
- Department of Botany, University of Delhi, New Delhi, India
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Pansarin ER, Ferreira AWC. Evolutionary disruption in the pollination system of Vanilla (Orchidaceae). Plant Biol (Stuttg) 2022; 24:157-167. [PMID: 34724285 DOI: 10.1111/plb.13356] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/18/2021] [Accepted: 09/28/2021] [Indexed: 06/13/2023]
Abstract
Pollination of the pantropical Vanilla has been linked to melittophily and food deception. Here we investigated the role of flower traits on the reproduction of Neotropical Vanilla. We also studied the evolution of pollination systems in order to understand the origin of production of flower resources and the diversification of pollinators in this orchid genus. Our study was founded on data of adaptations in flower morphology, production of resources, scent release, pollinators and breeding systems of Vanilla and presenting new data on reproductive biology of V. palmarum. Data on reproductive biology of Vanilla were mapped onto a phylogeny to address our queries on the evolution of pollination systems in this genus. Vanilla palmarum shows a mixed mating system, with its facultative autogamous flowers being pollinated by hummingbirds. Its yellow flowers are scentless and produces nectar. Mapping of the pollination system onto trees resulted in one origin for bird pollination and at least two origins for autogamy in Vanilla. Nectar secretion has a single origin in the Neotropical thick-leafed lineage. Bird pollination of Vanilla is shown for the first time. The origin of ornithophily within a bee-pollinated clade is supported by flower morphology. Floral transitions to ornithophily have been favoured by the occupation of a distinct niche from that of the other thick-leafed Vanilla species. Despite its specialized pollination, V. palmarum is autogamous. A mixed mating system can promote reproductive assurance in the case of a decline in pollinator populations, or in areas where pollinator services are irregular or absent.
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Affiliation(s)
- E R Pansarin
- Department of Biology, Laboratory of Molecular Biology and Systematics of Plants, Faculty of Philosophy, Sciences and Literature of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil
| | - A W C Ferreira
- Department of Biology, Laboratory of Orchid Studies, Cidade Universitária Dom Delgado, Federal University of Maranhão, São Luís, MA, Brazil
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Zhang X, Jia Y, Liu Y, Chen D, Luo Y, Niu S. Challenges and Perspectives in the Study of Self-Incompatibility in Orchids. Int J Mol Sci 2021; 22:ijms222312901. [PMID: 34884706 PMCID: PMC8657995 DOI: 10.3390/ijms222312901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 11/25/2021] [Accepted: 11/26/2021] [Indexed: 11/16/2022] Open
Abstract
Self-incompatibility affects not only the formation of seeds, but also the evolution of species diversity. A robust understanding of the molecular mechanisms of self-incompatibility is essential for breeding efforts, as well as conservation biology research. In recent years, phenotypic and multiple omics studies have revealed that self-incompatibility in Orchidaceae is mainly concentrated in the subfamily Epidendroideae, and the self-incompatibility phenotypes are diverse, even in the same genus, and hormones (auxin and ethylene), and new male and female determinants might be involved in SI response. This work provides a good foundation for future studies of the evolution and molecular mechanisms of self-incompatibility. We review recent research progress on self-incompatibility in orchids at the morphological, physiological, and molecular levels, provide a general overview of self-incompatibility in orchids, and propose future research directions.
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Affiliation(s)
- Xiaojing Zhang
- College of Horticulture, Hebei Agricultural University, Baoding 071001, China; (X.Z.); (Y.J.); (Y.L.); (D.C.)
| | - Yin Jia
- College of Horticulture, Hebei Agricultural University, Baoding 071001, China; (X.Z.); (Y.J.); (Y.L.); (D.C.)
| | - Yang Liu
- College of Horticulture, Hebei Agricultural University, Baoding 071001, China; (X.Z.); (Y.J.); (Y.L.); (D.C.)
| | - Duanfen Chen
- College of Horticulture, Hebei Agricultural University, Baoding 071001, China; (X.Z.); (Y.J.); (Y.L.); (D.C.)
| | - Yibo Luo
- State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
- Correspondence: (Y.L.); (S.N.)
| | - Shance Niu
- College of Horticulture, Hebei Agricultural University, Baoding 071001, China; (X.Z.); (Y.J.); (Y.L.); (D.C.)
- State Key Laboratory of North China Crop Improvement and Regulation, Hebei Agricultural University, Baoding 071001, China
- Correspondence: (Y.L.); (S.N.)
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Wang QQ, Zhu MJ, Yu X, Bi YY, Zhou Z, Chen MK, Chen J, Zhang D, Ai Y, Liu ZJ, Lan S. Genome-Wide Identification and Expression Analysis of Terpene Synthase Genes in Cymbidium faberi. Front Plant Sci 2021; 12:751853. [PMID: 34899778 PMCID: PMC8656225 DOI: 10.3389/fpls.2021.751853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 11/01/2021] [Indexed: 06/05/2023]
Abstract
Terpene synthases (TPSs) are essential for forming terpenes, which play numerous functional roles in attracting pollinators, defending plants, and moderating the interaction between plants. TPSs have been reported in some orchids, but genome-wide identification of terpenes in Cymbidium faberi is still lacking. In this study, 32 putative TPS genes were classified in C. faberi and divided into three subfamilies (TPS-a, TPS-b, and TPS-e/f). Motif and gene structure analysis revealed that most CfTPS genes had the conserved aspartate-rich DDxxD motif. TPS genes in the TPS-a and TPS-b subfamilies had variations in the RRX8W motif. Most cis-elements of CfTPS genes were found in the phytohormone responsiveness category, and MYC contained most of the numbers associated with MeJA responsiveness. The Ka/Ks ratios of 12/13 CfTPS gene pairs were less than one, indicated that most CfTPS genes have undergone negative selection. The tissue-specific expression patterns showed that 28 genes were expressed in at least one tissue in C. faberi, and TPS genes were most highly expressed in flowers, followed by leaves and pseudobulbs. In addition, four CfTPS genes were selected for the real-time reverse transcription quantitative PCR (RT-qPCR) experiment. The results revealed that CfTPS12, CfTPS18, CfTPS23, and CfTPS28 were mainly expressed in the full flowering stage. CfTPS18 could convert GPP to β-myrcene, geraniol, and α-pinene in vitro. These findings of CfTPS genes of C. faberi may provide valuable information for further studies on TPSs in orchids.
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Affiliation(s)
- Qian-Qian Wang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Meng-Jia Zhu
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Xia Yu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yuan-Yang Bi
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhuang Zhou
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural Sciences, Wenzhou, China
| | - Ming-Kun Chen
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Jiating Chen
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Diyang Zhang
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Ye Ai
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Zhong-Jian Liu
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- Zhejiang Institute of Subtropical Crops, Zhejiang Academy of Agricultural Sciences, Wenzhou, China
- Institute of Vegetable and Flowers, Shandong Academy of Agricultural Sciences, Jinan, China
| | - Siren Lan
- Key Laboratory of National Forestry and Grassland Administration for Orchid Conservation and Utilization at College of Landscape Architecture, Fujian Agriculture and Forestry University, Fuzhou, China
- College of Forestry, Fujian Agriculture and Forestry University, Fuzhou, China
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Margońska HB, Kozieradzka-Kiszkurno M, Brzezicka E, Haliński ŁP, Davies KL, Lipińska MM. Crepidium sect. Crepidium (Orchidaceae, Malaxidinae)-Chemical and Morphological Study of Flower Structures in the Context of Pollination Processes. Plants (Basel) 2021; 10:plants10112373. [PMID: 34834736 PMCID: PMC8621117 DOI: 10.3390/plants10112373] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 10/27/2021] [Accepted: 10/31/2021] [Indexed: 06/13/2023]
Abstract
Crepidium is a large genus of mainly pantropical orchids. The lips of its flowers are upwardly directed and do not serve as landing platforms for pollinators. This role is assumed by the dorsal sepal and/or gynostemium. Information about the pollination and floral morphology of this genus is scarce. To date, no papers have been published on these topics. Field observations have revealed that the flowers are visited by small flies, midges, fruit flies, other small dipterans, ants, spiders, and mites. Preliminary observations revealed at least two forms of small liquid droplets secreted on the lip surface of Crepidium species: simple secretions from epidermal cells, and cell sap released upon the rupturing of raphide-producing cells. Further research revealed that this was the first time liquid secretion was recorded in this genus. Floral secretions were subjected to sequential organic solvent extraction and gas chromatography-mass spectrometry (GC-MS). Floral parts were investigated by means of scanning (SEM) and transmission electron microscopy (TEM), and histochemical tests. The presence of liquid droplets on the lip of Crepidium, the presence of a food reward, and the sequence of raphide development are reported here for the first time.
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Affiliation(s)
- Hanna B. Margońska
- Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland;
| | - Małgorzata Kozieradzka-Kiszkurno
- Department of Plant Cytology and Embryology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.K.-K.); (E.B.)
| | - Emilia Brzezicka
- Department of Plant Cytology and Embryology, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland; (M.K.-K.); (E.B.)
| | - Łukasz P. Haliński
- Department of Environmental Analysis, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland;
| | - Kevin L. Davies
- School of Earth and Environmental Sciences, Cardiff University, Cardif CF10 3AT, UK;
| | - Monika M. Lipińska
- Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, 80-308 Gdańsk, Poland;
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Abstract
Vanilla bean is the second most expensive spice in the world. While widely cultivated for centuries due to its importance for industry and gastronomy, its dispersers are unknown. In the present study, I investigated the system of seed dispersal of Neotropical vanillas based on experimental observations, the morpho-anatomy of fruits and seeds, and the effect of dormancy breakdown on seed germination. My results show the central cavity of the fruit contains copious amounts of seed with sclerified coats that are consumed by birds. The combination of gradually opening dehiscent fruits and a well-developed mesocarp rich in raphide idioblasts reinforces the idea that seed dispersal in Vanilla is more adapted to non-chewing animals. The digestive acids of birds sclerify the hard seed coats, breaking dormancy and promoting germination at the beginning of the wet season, which is fundamental for seedling survival and for the establishment of plants in the early stages of development during the rainy season. Zoochory in Vanilla is show for the first time. The chemical scarification of the seed coat is crucial for synchronizing the biological processes involved in seed germination. My evidence on endozoochory and the processes involved in seed germination of Neotropical vanillas provides new insights into understanding of the early evolution of seed dispersal in orchids.
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Affiliation(s)
- E R Pansarin
- Department of Biology, Faculty of Philosophy, Sciences and Literature of Ribeirão Preto, University of São Paulo, Av. Bandeirantes 3900, Ribeirão Preto, SP, 14040-901, Brazil
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Feng JQ, Zhang FP, Huang JL, Hu H, Zhang SB. Allometry Between Vegetative and Reproductive Traits in Orchids. Front Plant Sci 2021; 12:728843. [PMID: 34721458 PMCID: PMC8548613 DOI: 10.3389/fpls.2021.728843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Accepted: 08/25/2021] [Indexed: 06/13/2023]
Abstract
In flowering plants, inflorescence characteristics influence both seed set and pollen contribution, while inflorescence and peduncle size can be correlated with biomass allocation to reproductive organs. Peduncles also play a role in water and nutrient supply of flowers, and mechanical support. However, it is currently unclear whether inflorescence size is correlated with peduncle size. Here, we tested whether orchids with large diameter peduncles bear more and larger flowers than those with smaller peduncles by analyzing 10 traits of inflorescence, flower, and leaf in 26 species. Peduncle diameters were positively correlated with inflorescence length and total floral area, indicating that species with larger peduncles tended to have larger inflorescences and larger flowers. We also found strongly positive correlation between inflorescence length and leaf area, and between total floral area and total leaf area, which suggested that reproductive organs may be allometrically coordinated with vegetative organs. However, neither flower number nor floral dry mass per unit area were correlated with leaf number or leaf dry mass per unit area, implying that the function between leaf and flower was uncoupled. Our findings provided a new insight for understanding the evolution of orchids, and for horticulturalists interested in improving floral and inflorescence traits in orchids.
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Affiliation(s)
- Jing-Qiu Feng
- Key Laboratory of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Feng-Ping Zhang
- Yunnan Key Laboratory of Dai and Yi Medicines, College of Traditional Chinese Medicine, Yunnan University of Chinese Medicine, Kunming, China
| | | | - Hong Hu
- Key Laboratory of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
| | - Shi-Bao Zhang
- Key Laboratory of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China
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Reyes HC, Draper D, Marques I. Pollination in the Rainforest: Scarce Visitors and Low Effective Pollinators Limit the Fruiting Success of Tropical Orchids. Insects 2021; 12:856. [PMID: 34680625 DOI: 10.3390/insects12100856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 09/10/2021] [Accepted: 09/17/2021] [Indexed: 11/17/2022]
Abstract
A single plant might be visited by many flower visitors but not all might act as pollinators. Legitimate pollinators might also differ considerably in their efficiency, limiting pollination success. Unsuitable climatic conditions such as rain also affect pollinator activity. However, in the evergreen rainforest there is no prolonged dry season and flowering occurs usually under rain. Here, we explore the dependence on pollinators and the efficiency of flower visitors for the fruiting success of 10 Andean rainforest orchids. All species were self-compatible but strictly pollinator-dependent. Overall, we found low levels of fruit set in control flowers while experimental geitonogamous and cross-pollinations increased fruit set, revealing extensive pollination limitation in all populations. Seed viability dropped considerably after self and geitonogamous pollinations suggesting the possibility of early-acting inbreeding depression. Even though we monitored flower visitors on an extensive survey, few visitors were seen in these species and even fewer acted as legitimate pollinators. Thus, even though orchid pollination might be extremely diversified, these results show that few visitors are pollinating these species, explaining the low levels of fruit set recorded in the area studied.
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Łobas Z, Khapugin A, Żołubak E, Jakubska-Busse A. The Epipactis helleborine Group (Orchidaceae): An Overview of Recent Taxonomic Changes, with an Updated List of Currently Accepted Taxa. Plants (Basel) 2021; 10:plants10091839. [PMID: 34579372 PMCID: PMC8469704 DOI: 10.3390/plants10091839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 08/30/2021] [Accepted: 09/01/2021] [Indexed: 11/29/2022]
Abstract
The Epipactis helleborine (L.) Crantz group is one of the most taxonomically challenging species complexes within the genus Epipactis. Because of the exceptionally high levels of morphological variability and the ability to readily cross with other species, ninety different taxa at various taxonomic ranks have already been described within its nominative subspecies, but the taxonomic status of most of them is uncertain, widely disputed, and sometimes even irrelevant. The present review is based on results of the most recent research devoted to the E. helleborine group taxonomy. In addition, we analysed data about taxa belonging to this group presented in some research articles and monographs devoted directly to the genus Epipactis or to orchids in certain area(s). Based on the reviewed literature and data collected in four taxonomic databases available online, we propose an updated list of the 10 currently accepted taxa in the E. helleborine group (two species, six subspecies, and two varieties), which includes E. helleborine (L.) Crantz subsp. helleborine; E. helleborine subsp. bithynica (Robatsch) Kreutz; E. helleborine subsp. distans (Arv.-Touv.) R.Engel and P.Quentin; E. helleborine subsp. neerlandica (Verm.) Buttler; E. helleborine var. tangutica (Schltr.) S.C.Chen and G.H.Zhu; E. helleborine subsp. tremolsii (Pau) E.Klein; E. helleborine subsp. voethii (Robatsch) Jakubska-Busse, Żołubak, and Łobas, stat. nov.; E. condensata Boiss. ex D.P.Young; E. condensata var. kuenkeleana (Akhalk., H.Baumann, R.Lorenz, and Mosul.) Popovich; and E. cupaniana C.Brullo, D’Emerico, and Pulv.
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Affiliation(s)
- Zbigniew Łobas
- Department of Botany, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland;
- Correspondence: (Z.Ł.); (A.J.-B.)
| | - Anatoliy Khapugin
- Institute of Environmental and Agricultural Biology (X-BIO), Tyumen State University, 625003 Tyumen, Russia;
- Joint Directorate of the Mordovia State Nature Reserve and National Park “Smolny”, 430005 Saransk, Russia
| | - Elżbieta Żołubak
- Department of Botany, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland;
| | - Anna Jakubska-Busse
- Department of Botany, Faculty of Biological Sciences, University of Wroclaw, 50-328 Wroclaw, Poland;
- Correspondence: (Z.Ł.); (A.J.-B.)
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Cozzolino S, Scopece G, Lussu M, Cortis P, Schiestl FP. Do floral and ecogeographic isolation allow the co-occurrence of two ecotypes of Anacamptis papilionacea (Orchidaceae)? Ecol Evol 2021; 11:9917-9931. [PMID: 34367549 PMCID: PMC8328454 DOI: 10.1002/ece3.7432] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/10/2021] [Accepted: 02/18/2021] [Indexed: 11/08/2022] Open
Abstract
Ecotypes are relatively frequent in flowering plants and considered central in ecological speciation as local adaptation can promote the insurgence of reproductive isolation. Without geographic isolation, gene flow usually homogenizes the allopatrically generated phenotypic and ecological divergences, unless other forms of reproductive isolation keep them separated. Here, we investigated two orchid ecotypes with marked phenotypic floral divergence that coexist in contact zones. We found that the two ecotypes show different ecological habitat preferences with one being more climatically restricted than the other. The ecotypes remain clearly morphologically differentiated both in allopatry and in sympatry and differed in diverse floral traits. Despite only slightly different flowering times, the two ecotypes achieved floral isolation thanks to different pollination strategies. We found that both ecotypes attract a wide range of insects, but the ratio of male/female attracted by the two ecotypes was significantly different, with one ecotype mainly attracts male pollinators, while the other mainly attracts female pollinators. As a potential consequence, the two ecotypes show different pollen transfer efficiency. Experimental plots with pollen staining showed a higher proportion of intra- than interecotype movements confirming floral isolation between ecotypes in sympatry while crossing experiments excluded evident postmating barriers. Even if not completely halting the interecotypes pollen flow in sympatry, such incipient switch in pollination strategy between ecotypes may represent a first step on the path toward evolution of sexual mimicry in Orchidinae.
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Affiliation(s)
| | - Giovanni Scopece
- Department of BiologyUniversity Federico II of NaplesNapoliItaly
| | - Michele Lussu
- Department of Life and Environmental SciencesUniversity of CagliariCagliariItaly
- Istituto Regionale per la Floricoltura (IRF)SanremoItaly
| | - Pierluigi Cortis
- Department of Life and Environmental SciencesUniversity of CagliariCagliariItaly
| | - Florian P. Schiestl
- Department of Systematic and Evolutionary Botany and Botanical GardensUniversity of ZurichZurichSwitzerland
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50
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Abstract
Besides the plant-fungus symbiosis in arbuscular mycorrhizal (AM) and ectomycorrhizal (EM) plants, many endorhizal and rhizosphere bacteria (Root Associated Bacteria, or RAB) also enhance plant fitness, diversity, and coexistence among plants via bi- or tripartite interactions with plant hosts and mycorrhizal fungi. Assuming that bacterial associations are just as important for the obligate mycorrhizal plant family Orchidaceae, surprisingly little is known about the RAB associated with orchids. Herein, we first present the current, underwhelming state of RAB research including their interactions with fungi and the influence of holobionts on plant fitness. We then delineate the need for novel investigations specifically in orchid RAB ecology, and sketch out questions and hypotheses which, when addressed, will advance plant-microbial ecology. We specifically discuss the potential effects of beneficial RAB on orchids as: (1) Plant Growth Promoting Rhizobacteria (PGPR), (2) Mycorrhization Helper Bacteria (MHB), and (3) constituents of an orchid holobiont. We further posit that a hologenomic view should be considered as a framework for addressing co-evolution of the plant host, their obligate Orchid Mycorrhizal Fungi (OMF), and orchid RAB. We conclude by discussing implications of the suggested research for conservation of orchids, their microbial partners, and their collective habitats.
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Affiliation(s)
- Jaspreet Kaur
- Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, United States
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