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Chalenko E, Lysenko V, Kosolapov A, Usova E, Dmitriev P, Yadronova O, Varduny T, Tarik E, Ignatova M, Aslanyan V, Kirichenko E. Light green leaf sectors of variegated Dracaena fragrans plants show similar rates of oxygenic photosynthesis tо that of normal, dark green leaf sectors. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 215:109040. [PMID: 39142012 DOI: 10.1016/j.plaphy.2024.109040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2024] [Revised: 08/05/2024] [Accepted: 08/09/2024] [Indexed: 08/16/2024]
Abstract
Adaptation and functional significance of chlorophyll deficit in the light green leaf sectors of variegated plants are little known. Efficiency of photosystem II for dark and light adapted states (Fv/Fm and ΔF/Fm') and fluorescence decrease rates (Rfd) of light green leaf sectors of Dracaena fragrans L. were studied by methods of PAM-fluorometry and video registration. In addition, white light reflectance and transmittance of these leaf sectors were measured using an integrating sphere. Absorption was calculated from reflectance and transmittance. Net CO2 assimilation rates (PN) were measured using a flow chamber and photolytic O2 evolution rates (PAYO2) were studied by a novel method of Fourier photoacoustics which is insensitive to respiration, photorespiration and other processes of O2 uptake. All the photosynthetic parameters (Fv/Fm, ΔF/Fm', PN and PAYO2) were found to be very close between light green and normal green leaf sectors, whereas chlorophyll content and light absorption were 7.5-fold and 1.47-fold different respectively. Contradiction between low chlorophyll absorption and high (as in normal green sectors) rate of oxygenic photosynthesis in light-green sectors was proposed to be a consequence of different contribution of cyclic electron transport around PSII (CET-PSII) and/or around PSI (CET-PSI) in the total photosynthesis occurring in these sectors. Particularly, it cannot be excluded, that some part of CET activity occurring in normal green leaf sectors may be lost in the light green sectors retaining the same linear (non-cyclic) electron transport (LET) activity as in normal green sectors.
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Affiliation(s)
- Elizaveta Chalenko
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Vladimir Lysenko
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia.
| | - Aleksey Kosolapov
- Russian Research Institute for the Integrated Use and Protection of Water Resources, Rostov-on-Don, 344037, Russia
| | - Elena Usova
- Russian Research Institute for the Integrated Use and Protection of Water Resources, Rostov-on-Don, 344037, Russia
| | - Pavel Dmitriev
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Olga Yadronova
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Tatyana Varduny
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Ekaterina Tarik
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Maria Ignatova
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Veronica Aslanyan
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
| | - Evgeniya Kirichenko
- Southern Federal University, Academy of Biology and Biotechnology, Rostov-on-Don, 344049, Russia
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Kahlaoui S, Hcini K, Haddada A, Saadellaoui W, Zardi-Bergaoui A, Ascrizzi R, Flamini G, Harzallah-Skhiri F, Stambouli-Essassi S. Characterization of Volatile Organic Compounds and Essential Oil Profile of Pittosporum tobira (Thunb.) W.T. Aiton Cultivated in Tunisia. Chem Biodivers 2024:e202401360. [PMID: 38935806 DOI: 10.1002/cbdv.202401360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 06/27/2024] [Accepted: 06/27/2024] [Indexed: 06/29/2024]
Abstract
The chemical compositions of the essential oils (EOs) of roots, young and old leaves and stems, and flowers of Pittosporum tobira (Thunb.) W.T. Aiton cultivated in Tunisia and of the volatile organic compounds (VOCs) emitted by the powder of each organ were identified. The EOs are extracted from fresh material by hydrodistillation, whereas the VOCs are obtained by head space solid-phase microextraction (HS-SPME) from the powdered dry tissues. Fifty-eight VOCs are identified, while, 105 components are detected for the EOs. The main EOs compounds are α-neoclovene, β-caryophyllene and limonene in roots (22.56, 12.52, and 8.59 %, respectively), viridiflorol in young stems, flowers and young leaves (34.90, 31.60, and 24.60 %, respectively), α-cadinol in young stems and leaves, and flowers (13.80, 10.40, and 9.10 %, respectively), (E)-nerolidol in flowers (13.30 %), and germacrene D in old stems (9.06 %). The major detected VOCs are n-undecane, mainly in young and old leaves (71.40 and 40.90 %, respectively), n-nonane in young leaves and flowers (31.80 and 27.10 %, respectively), α-cubebene in old stems and flowers (22.60 and 15.50 %, respectively), and α-gurjunene and β-gurjunene in roots (14.20 and 12.20 %, respectively). Principal Component Analysis (PCA) carried out on the 26 main volatile compounds (relative content exceeding 6 %) identified both by HS and in the EOs allowed their classification into two groups; compounds specific to roots and those specific to aerial parts. The later are subdivided in to two subgroups; old leaves and stems compounds subgroup, and young leaves and stems, and flowers one. We can notice that the two methods used to extract P. tobira volatile compounds and identify them are complementary. This study defines and differentiates, for the first time, the specific aroma profile of P. tobira from Tunisia. In addition to its ornamental value, all the organs of this species, could be valued as a source of volatile compounds useful in perfume, cosmetics and as food flavoring products.
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Affiliation(s)
- Samiha Kahlaoui
- Laboratory of Biodiversity, Biotechnology and Climate Change (LR11-ES09), Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia
| | - Kheiria Hcini
- Laboratory of Biodiversity, Biotechnology and Climate Change (LR11-ES09), Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia
| | - Abir Haddada
- Laboratory of Biodiversity, Biotechnology and Climate Change (LR11-ES09), Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia
| | - Wissal Saadellaoui
- Laboratory of Biodiversity, Biotechnology and Climate Change (LR11-ES09), Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia
| | - Afifa Zardi-Bergaoui
- Laboratory of Heterocyclic Chemistry, Natural Products and Reactivity (LR11-ES39), Medicinal Chemistry and Natural Products, Faculty of Sciences of Monastir, University of Monastir, 5019, Monastir, Tunisia
| | - Roberta Ascrizzi
- Dipartimento di Farmacia, Università di Pisa, Via Bonanno 33, 56126, Pisa, Italy
| | - Guido Flamini
- Dipartimento di Farmacia, Università di Pisa, Via Bonanno 33, 56126, Pisa, Italy
- University of Pisa, Centro Interdipartimentale di Ricerca 'Nutraceutica e Alimentazione per la Salute' Nutrafood, Via del Borghetto 80, Pisa, 56124, Italy
| | - Fethia Harzallah-Skhiri
- Laboratory of Bioresources: Integrative Biology and Valorization (LR14-ES06), High Institute of Biotechnology of Monastir, University of Monastir, 5000, Monastir, Tunisia
| | - Sondes Stambouli-Essassi
- Laboratory of Biodiversity, Biotechnology and Climate Change (LR11-ES09), Faculty of Sciences of Tunis, University of Tunis El Manar, 1060, Tunis, Tunisia
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Liu Q, Zheng L, Wang Y, Zhou Y, Gao F. AmDHN4, a winter accumulated SKn-type dehydrin from Ammopiptanthus mongolicus, and regulated by AmWRKY45, enhances the tolerance of Arabidopsis to low temperature and osmotic stress. Int J Biol Macromol 2024; 266:131020. [PMID: 38521330 DOI: 10.1016/j.ijbiomac.2024.131020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/17/2024] [Accepted: 03/18/2024] [Indexed: 03/25/2024]
Abstract
Ammopiptanthus mongolicus, a rare temperate evergreen broadleaf shrub, exhibits remarkable tolerance to low temperature and drought stress in winter. Late embryogenesis abundant (LEA) proteins, a kind of hydrophilic protein with a protective function, play significant roles in enhancing plant tolerance to abiotic stress. In this present study, we analyzed the evolution and expression of LEA genes in A. mongolicus, and investigated the function and regulatory mechanism of dehydrin under abiotic stresses. Evolutionary analysis revealed that 14 AmLEA genes underwent tandem duplication events, and 36 AmLEA genes underwent segmental duplication events Notably, an expansion in SKn-type dehydrins was observed. Expression analysis showed that AmDHN4, a SKn-type dehydrin, was up-regulated in winter and under low temperature and osmotic stresses. Functional analysis showcased that the heterologous expression of the AmDHN4 enhanced the tolerance of yeast and tobacco to low temperature stress. Additionally, the overexpression of AmDHN4 significantly improved the tolerance of transgenic Arabidopsis to low temperature, drought, and osmotic stress. Further investigations identified AmWRKY45, a downstream transcription factor in the jasmonic acid signaling pathway, binding to the AmDHN4 promoter and positively regulating its expression. In summary, these findings contribute to a deeper understanding of the functional and regulatory mechanisms of dehydrin.
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Affiliation(s)
- Qi Liu
- Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Lamei Zheng
- Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Yan Wang
- Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Yijun Zhou
- Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Fei Gao
- Laboratory of Mass Spectrometry Imaging and Metabolomics (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; Key Laboratory of Ecology and Environment in Minority Areas (Minzu University of China), National Ethnic Affairs Commission, Beijing 100081, China; College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
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Zhao X, Ma K, Li Z, Li W, Zhang X, Liu S, Meng R, Lu B, Li X, Ren J, Zhang L, Yuan X. Transcriptome Analysis Reveals Brassinolide Signaling Pathway Control of Foxtail Millet Seedling Starch and Sucrose Metabolism under Freezing Stress, with Implications for Growth and Development. Int J Mol Sci 2023; 24:11590. [PMID: 37511348 PMCID: PMC10380969 DOI: 10.3390/ijms241411590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 07/14/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
Low-temperature stress limits the growth and development of foxtail millet. Freezing stress caused by sudden temperature drops, such as late-spring coldness, often occurs in the seedling stage of foxtail millet. However, the ability and coping strategies of foxtail millet to cope with such stress are not clear. In the present study, we analyzed the self-regulatory mechanisms of freezing stress in foxtail millet. We conducted a physiological study on foxtail millet leaves at -4 °C for seven different durations (0, 2, 4, 6, 8, 10, and 12 h). Longer freezing time increased cell-membrane damage, relative conductance, and malondialdehyde content. This led to osmotic stress in the leaves, which triggered an increase in free proline, soluble sugar, and soluble protein contents. The increases in these substances helped to reduce the damage caused by stress. The activities of superoxide dismutase, peroxidase, and catalase increased reactive oxygen species (ROS) content. The optimal time point for the response to freezing stress was 8 h after exposure. The transcriptome analysis of samples held for 8 h at -4 °C revealed 6862 differentially expressed genes (DEGs), among which the majority are implicated in various pathways, including the starch and sucrose metabolic pathways, antioxidant enzyme pathways, brassinolide (BR) signaling pathway, and transcription factors, according to Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment. We investigated possible crosstalk between BR signals and other pathways and found that BR signaling molecules were induced in response to freezing stress. The beta-amylase (BAM) starch hydrolase signal was enhanced by the BR signal, resulting in the accelerated degradation of starch and the formation of sugars, which served as emerging ROS scavengers and osmoregulators to resist freezing stress. In conclusion, crosstalk between BR signal transduction, and both starch and sucrose metabolism under freezing stress provides a new perspective for improving freezing resistance in foxtail millet.
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Affiliation(s)
- Xiatong Zhao
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Ke Ma
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Zhong Li
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Weidong Li
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Xin Zhang
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Shaoguang Liu
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Ru Meng
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Boyu Lu
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Xiaorui Li
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Jianhong Ren
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Liguang Zhang
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
| | - Xiangyang Yuan
- College of Agronomy, Shanxi Agricultural University, Taigu, Jinzhong 030801, China
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Zhang Q, Huang J, Zhou P, Hao M, Zhang M. Cytological and Transcriptomic Analysis Provide Insights into the Formation of Variegated Leaves in Ilex × altaclerensis 'Belgica Aurea'. PLANTS (BASEL, SWITZERLAND) 2021; 10:552. [PMID: 33804110 PMCID: PMC7999392 DOI: 10.3390/plants10030552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 05/08/2023]
Abstract
Ilex × altaclerensis 'Belgica Aurea' is an attractive ornamental plant bearing yellow-green variegated leaves. However, the mechanisms underlying the formation of leaf variegation in this species are still unclear. Here, the juvenile yellow leaves and mature variegated leaves of I. altaclerensis 'Belgica Aurea' were compared in terms of leaf structure, pigment content and transcriptomics. The results showed that no obvious differences in histology were noticed between yellow and variegated leaves, however, ruptured thylakoid membranes and altered ultrastructure of chloroplasts were found in yellow leaves (yellow) and yellow sectors of the variegated leaves (variegation). Moreover, the yellow leaves and the yellow sectors of variegated leaves had significantly lower chlorophyll compared to green sectors of the variegated leaves (green). In addition, transcriptomic sequencing identified 1675 differentially expressed genes (DEGs) among the three pairwise comparisons (yellow vs. green, variegation vs. green, yellow vs. variegation). Expression of magnesium-protoporphyrin IX monomethyl ester (MgPME) [oxidative] cyclase, monogalactosyldiacylglycerol (MGDG) synthase and digalactosyldiacylglycerol (DGDG) synthase were decreased in the yellow leaves. Altogether, chlorophyll deficiency might be the main factors driving the formation of leaf variegation in I.altaclerensis 'Belgica Aurea'.
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Affiliation(s)
- Qiang Zhang
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (Q.Z.); (M.H.)
| | - Jing Huang
- Jiangsu Academy of Forestry, 109 Danyang Road, Dongshanqiao, Nanjing 211153, China; (J.H.); (P.Z.)
| | - Peng Zhou
- Jiangsu Academy of Forestry, 109 Danyang Road, Dongshanqiao, Nanjing 211153, China; (J.H.); (P.Z.)
| | - Mingzhuo Hao
- Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, 159 Longpan Road, Nanjing 210037, China; (Q.Z.); (M.H.)
| | - Min Zhang
- Jiangsu Academy of Forestry, 109 Danyang Road, Dongshanqiao, Nanjing 211153, China; (J.H.); (P.Z.)
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