1
|
Marks RA, Van Der Pas L, Schuster J, Gilman IS, VanBuren R. Convergent evolution of desiccation tolerance in grasses. NATURE PLANTS 2024; 10:1112-1125. [PMID: 38906996 DOI: 10.1038/s41477-024-01729-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 05/21/2024] [Indexed: 06/23/2024]
Abstract
Desiccation tolerance has evolved repeatedly in plants as an adaptation to survive extreme environments. Plants use similar biophysical and cellular mechanisms to survive life without water, but convergence at the molecular, gene and regulatory levels remains to be tested. Here we explore the evolutionary mechanisms underlying the recurrent evolution of desiccation tolerance across grasses. We observed substantial convergence in gene duplication and expression patterns associated with desiccation. Syntenic genes of shared origin are activated across species, indicative of parallel evolution. In other cases, similar metabolic pathways are induced but using different gene sets, pointing towards phenotypic convergence. Species-specific mechanisms supplement these shared core mechanisms, underlining the complexity and diversity of evolutionary adaptations to drought. Our findings provide insight into the evolutionary processes driving desiccation tolerance and highlight the roles of parallel and convergent evolution in response to environmental challenges.
Collapse
Affiliation(s)
- Rose A Marks
- Department of Horticulture, Michigan State University, East Lansing, MI, USA.
- Plant Resilience Institute, Michigan State University, East Lansing, MI, USA.
- Department of Plant Biology, University of Illinois, Urbana, IL, USA.
| | - Llewelyn Van Der Pas
- Department of Molecular and Cell Biology, University of Cape Town, Cape Town, South Africa
| | - Jenny Schuster
- Department of Horticulture, Michigan State University, East Lansing, MI, USA
- Plant Resilience Institute, Michigan State University, East Lansing, MI, USA
| | - Ian S Gilman
- Department of Horticulture, Michigan State University, East Lansing, MI, USA
- Plant Resilience Institute, Michigan State University, East Lansing, MI, USA
| | - Robert VanBuren
- Department of Horticulture, Michigan State University, East Lansing, MI, USA.
- Plant Resilience Institute, Michigan State University, East Lansing, MI, USA.
- Department of Plant Biology, Michigan State University, East Lansing, MI, USA.
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI, USA.
| |
Collapse
|
2
|
Xing C, Lei C, Yang Y, Zhou D, Liu S, Xu J, Liu Z, Wu T, Zhou X, Huang S, Liu W. Drought responses and population differentiation of Calohypnum plumiforme inferred from comparative transcriptome analysis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 208:108456. [PMID: 38417308 DOI: 10.1016/j.plaphy.2024.108456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 01/16/2024] [Accepted: 02/20/2024] [Indexed: 03/01/2024]
Abstract
Bryophytes, known as poikilohydric plants, possess vegetative desiccation-tolerant (DT) ability to withstand water deficit stress. Consequently, they offer valuable genetic resources for enhancing resistance to water scarcity stress. In this research, we examined the physiological, phytohormonal, and transcriptomic changes in DT mosses Calohypnum plumiforme from two populations, with and without desiccation treatment. Comparative analysis revealed population differentiation at physiological, gene sequence, and expression levels. Under desiccation stress, the activities of superoxide dismutase (SOD) and peroxidase (POD) showed significant increases, along with elevation of soluble sugars and proteins, consistent with the transcriptome changes. Notable activation of the bypass pathway of JA biosynthesis suggested their roles in compensating for JA accumulation. Furthermore, our analysis revealed significant correlations among phytohormones and DEGs in their respective signaling pathway, indicating potential complex interplays of hormones in C plumiforme. Protein phosphatase 2C (PP2C) in the abscisic acid signaling pathway emerged as the pivotal hub in the phytohormone crosstalk regulation network. Overall, this study was one of the first comprehensive transcriptome analyses of moss C. plumiforme under slow desiccation rates, expanding our knowledge of bryophyte transcriptomes and shedding light on the gene regulatory network involved in response to desiccation, as well as the evolutionary processes of local adaptation across moss populations.
Collapse
Affiliation(s)
- Chengguang Xing
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| | - Chunyi Lei
- Department of Scientific Research and Education, Heishiding Nature Reserve, Zhaoqing, 526536, China.
| | - Yuchen Yang
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| | - Dandan Zhou
- School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519000, China.
| | - Shanshan Liu
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| | - Jianqu Xu
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Zhiwei Liu
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| | - Tao Wu
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| | - Xiaohang Zhou
- School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China.
| | - Shuzhen Huang
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| | - Weiqiu Liu
- Guangdong Key Laboratory of Plant Resources, School of Ecology, Sun Yat-sen University, Shenzhen, 518100, China.
| |
Collapse
|
3
|
Li G, Zhang T, Yang L, Qin J, Yang Q, Cao Y, Luo J, Li X, Gao L, Chen Q, He X, Huang Y, Liu C, He L, Zheng J, Jiang K. Sterile line Dexiang074A enhances drought tolerance in hybrid rice. FRONTIERS IN PLANT SCIENCE 2023; 14:1054571. [PMID: 36968360 PMCID: PMC10033888 DOI: 10.3389/fpls.2023.1054571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 02/17/2023] [Indexed: 06/18/2023]
Abstract
Heterosis has been widely used in rice breeding, especially in improving rice yield. But it has rarely been studied in rice abiotic stress, including the drought tolerance, which is becoming one of the most important threaten in decreasing rice yield. Therefore, it is essential to studying the mechanism underlying heterosis in improving drought tolerance of rice breeding. In this study, Dexiang074B (074B) and Dexiang074A (074A) served as maintainer lines and sterile lines. Mianhui146 (R146), Chenghui727 (R727), LuhuiH103 (RH103), Dehui8258 (R8258), Huazhen (HZ), Dehui938 (R938), Dehui4923 (R4923), and R1391 served as restorer lines. The progeny were Dexiangyou (D146), Deyou4727 (D4727), Dexiang 4103 (D4103), Deyou8258 (D8258), Deyou Huazhen (DH), Deyou 4938 (D4938), Deyou 4923 (D4923), and Deyou 1391 (D1391). The restorer line and hybrid offspring were subjected to drought stress at the flowering stage. The results showed that Fv/Fm values were abnormal and oxidoreductase activity and MDA content were increased. However, the performance of hybrid progeny was significantly better than their respective restorer lines. Although the yield of hybrid progeny and restorer lines decreased simultaneously, the yield in hybrid offspring is significantly lower than the respective restorer line. Total soluble sugar content was consistent with the yield result, so we found that 074A can enhance drought tolerance in hybrid rice.
Collapse
Affiliation(s)
- Gengmi Li
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
- Biology and Molecular Biology Research Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Tao Zhang
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Li Yang
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Jian Qin
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Qianhua Yang
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Yingjiang Cao
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Jing Luo
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Xiangzhao Li
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Lei Gao
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Qian Chen
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
- Biology and Molecular Biology Research Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Xingping He
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Yong Huang
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Chuantao Liu
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Ling He
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Jiakui Zheng
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| | - Kaifeng Jiang
- Key Laboratory of Southwest Rice Biology and Genetic Breeding, Ministry of Agriculture/Luzhou Branch of National Rice Improvement Center, Rice and Sorghum Research Institute, Sichuan Academy of Agricultural Sciences, Deyang, China
| |
Collapse
|
4
|
Mihailova G, Solti Á, Sárvári É, Hunyadi-Gulyás É, Georgieva K. Protein Changes in Shade and Sun Haberlea rhodopensis Leaves during Dehydration at Optimal and Low Temperatures. PLANTS (BASEL, SWITZERLAND) 2023; 12:plants12020401. [PMID: 36679114 PMCID: PMC9861795 DOI: 10.3390/plants12020401] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/10/2023] [Accepted: 01/12/2023] [Indexed: 05/27/2023]
Abstract
Haberlea rhodopensis is a unique resurrection plant of high phenotypic plasticity, colonizing both shady habitats and sun-exposed rock clefts. H. rhodopensis also survives freezing winter temperatures in temperate climates. Although survival in conditions of desiccation and survival in conditions of frost share high morphological and physiological similarities, proteomic changes lying behind these mechanisms are hardly studied. Thus, we aimed to reveal ecotype-level and temperature-dependent variations in the protective mechanisms by applying both targeted and untargeted proteomic approaches. Drought-induced desiccation enhanced superoxide dismutase (SOD) activity, but FeSOD and Cu/ZnSOD-III were significantly better triggered in sun plants. Desiccation resulted in the accumulation of enzymes involved in carbohydrate/phenylpropanoid metabolism (enolase, triosephosphate isomerase, UDP-D-apiose/UDP-D-xylose synthase 2, 81E8-like cytochrome P450 monooxygenase) and protective proteins such as vicinal oxygen chelate metalloenzyme superfamily and early light-induced proteins, dehydrins, and small heat shock proteins, the latter two typically being found in the latest phases of dehydration and being more pronounced in sun plants. Although low temperature and drought stress-induced desiccation trigger similar responses, the natural variation of these responses in shade and sun plants calls for attention to the pre-conditioning/priming effects that have high importance both in the desiccation responses and successful stress recovery.
Collapse
Affiliation(s)
- Gergana Mihailova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Ádám Solti
- Department of Plant Physiology and Molecular Plant Biology, Institute of Biology, Eötvös Loránd University, Pázmány P. Sétány 1/C, H-1117 Budapest, Hungary
| | - Éva Sárvári
- Department of Plant Physiology and Molecular Plant Biology, Institute of Biology, Eötvös Loránd University, Pázmány P. Sétány 1/C, H-1117 Budapest, Hungary
| | - Éva Hunyadi-Gulyás
- Laboratory of Proteomics Research, Biological Research Centre, Eötvös Loránd Research Network, Temesvári Krt. 62., H-6726 Szeged, Hungary
| | - Katya Georgieva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| |
Collapse
|
5
|
Raman H, Raman R, Pirathiban R, McVittie B, Sharma N, Liu S, Qiu Y, Zhu A, Kilian A, Cullis B, Farquhar GD, Stuart‐Williams H, White R, Tabah D, Easton A, Zhang Y. Multienvironment QTL analysis delineates a major locus associated with homoeologous exchanges for water-use efficiency and seed yield in canola. PLANT, CELL & ENVIRONMENT 2022; 45:2019-2036. [PMID: 35445756 PMCID: PMC9325393 DOI: 10.1111/pce.14337] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 04/06/2022] [Indexed: 05/29/2023]
Abstract
Canola varieties exhibit variation in drought avoidance and drought escape traits, reflecting adaptation to water-deficit environments. Our understanding of underlying genes and their interaction across environments in improving crop productivity is limited. A doubled haploid population was analysed to identify quantitative trait loci (QTL) associated with water-use efficiency (WUE) related traits. High WUE in the vegetative phase was associated with low seed yield. Based on the resequenced parental genome data, we developed sequence-capture-based markers and validated their linkage with carbon isotope discrimination (Δ13 C) in an F2 population. RNA sequencing was performed to determine the expression of candidate genes underlying Δ13 C QTL. QTL contributing to main and QTL × environment interaction effects for Δ13 C and yield were identified. One multiple-trait QTL for Δ13 C, days to flower, plant height, and seed yield was identified on chromosome A09. Interestingly, this QTL region overlapped with a homoeologous exchange (HE) event, suggesting its association with the multiple traits. Transcriptome analysis revealed 121 significantly differentially expressed genes underlying Δ13 C QTL on A09 and C09, including in HE regions. Sorting out the negative relationship between vegetative WUE and seed yield is a priority. Genetic and genomic resources and knowledge so developed could improve canola WUE and yield.
Collapse
Affiliation(s)
- Harsh Raman
- NSW Department of Primary IndustriesWagga Wagga Agricultural InstituteWagga WaggaNew South WalesAustralia
| | - Rosy Raman
- NSW Department of Primary IndustriesWagga Wagga Agricultural InstituteWagga WaggaNew South WalesAustralia
| | - Ramethaa Pirathiban
- Centre for Biometrics and Data Science for Sustainable Primary Industries, National Institute for Applied Statistics Research AustraliaUniversity of WollongongWollongongNew South WalesAustralia
| | - Brett McVittie
- NSW Department of Primary IndustriesWagga Wagga Agricultural InstituteWagga WaggaNew South WalesAustralia
| | - Niharika Sharma
- NSW Department of Primary IndustriesOrange Agricultural InstituteOrangeNew South WalesAustralia
| | - Shengyi Liu
- The Key Laboratory of Biology and Genetic Improvement of Oil Crops, The Ministry of Agriculture and Rural Affairs of PRCOil Crops Research Institute, Chinese Academy of Agricultural SciencesWuhanHubeiChina
| | - Yu Qiu
- NSW Department of Primary IndustriesWagga Wagga Agricultural InstituteWagga WaggaNew South WalesAustralia
| | - Anyu Zhu
- Diversity Arrays Technology P/LUniversity of CanberraCanberraAustralian Capital TerritoryAustralia
| | - Andrzej Kilian
- Diversity Arrays Technology P/LUniversity of CanberraCanberraAustralian Capital TerritoryAustralia
| | - Brian Cullis
- Centre for Biometrics and Data Science for Sustainable Primary Industries, National Institute for Applied Statistics Research AustraliaUniversity of WollongongWollongongNew South WalesAustralia
| | - Graham D. Farquhar
- Research School of BiologyAustralian National UniversityCanberraAustralian Capital TerritoryAustralia
| | - Hilary Stuart‐Williams
- Research School of BiologyAustralian National UniversityCanberraAustralian Capital TerritoryAustralia
| | | | - David Tabah
- Advanta Seeds Pty LtdToowoombaQueenslandAustralia
| | | | - Yuanyuan Zhang
- The Key Laboratory of Biology and Genetic Improvement of Oil Crops, The Ministry of Agriculture and Rural Affairs of PRCOil Crops Research Institute, Chinese Academy of Agricultural SciencesWuhanHubeiChina
| |
Collapse
|
6
|
Synthesis, Structure-Property Evaluation and Biological Assessment of Supramolecular Assemblies of Bioactive Glass with Glycyrrhizic Acid and Its Monoammonium Salt. MATERIALS 2022; 15:ma15124197. [PMID: 35744255 PMCID: PMC9230998 DOI: 10.3390/ma15124197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 06/07/2022] [Accepted: 06/10/2022] [Indexed: 11/17/2022]
Abstract
Medical nutrients obtained from plants have been used in traditional medicine since ancient times, owning to the protective and therapeutic properties of plant extracts and products. Glycyrrhizic acid is one of those that, apart from its therapeutic effect, may contribute to stronger bones, inhibiting bone resorption and improving the bone structure and biomechanical strength. In the present study, we investigated the effect of a bioactive glass (BG) addition to the structure–property relationships of supramolecular assemblies formed by glycyrrhizic acid (GA) and its monoammonium salt (MSGA). FTIR spectra of supramolecular assemblies evidenced an interaction between BG components and hydroxyl groups of MSGA and GA. Moreover, it was revealed that BG components may interact and bond to the carboxyl groups of MSGA. In order to assess their biological effects, BG, MSGA, and their supramolecular assemblies were introduced to a culture of human bone-marrow-derived mesenchymal stromal cells (BMSCs). Both the BG and MSGA had positive influence on BMSC growth, viability, and osteogenic differentiation—these positive effects were most pronounced when BG1d-BG and MSGA were introduced together into cell culture in the form of MSGA:BG assemblies. In conclusion, MSGA:BG assemblies revealed a promising potential as a candidate material intended for application in bone defect reconstruction and bone tissue engineering approaches.
Collapse
|
7
|
Wang Y, Zhai J, Qi Z, Liu W, Cui J, Zhang X, Bai S, Li L, Shui G, Cui S. The specific glycerolipid composition is responsible for maintaining the membrane stability of Physcomitrella patens under dehydration stress. JOURNAL OF PLANT PHYSIOLOGY 2022; 268:153590. [PMID: 34911032 DOI: 10.1016/j.jplph.2021.153590] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 12/07/2021] [Accepted: 12/07/2021] [Indexed: 06/14/2023]
Abstract
Land colonization is a major event in plant evolution. Little is known about the evolutionary characteristics of lipids during this process. Here, we proved that Physcomitrella patens, a bryophyte that appeared in the early evolution of terrestrial plants, has short-term desiccation resistance. The maintenance of membrane integrity is related to its specific glycerolipid composition and key genes for lipid metabolism. We analyzed 414 types of lipid molecules, and found that phospholipids accounted for 61.7%, mainly PC and PI; glycolipids accounted for only 26.5%, with a special MGDG molecular map. The most abundant MDGD, that is, MGDG34:6, contained rare 15- and 19-carbon acyl chains; the level of neutral lipids was higher. This was consistent with the results observed by TEM, with fewer lamellae and obvious lipid droplets. Slight dehydration accumulated a large number of TAG molecules, and severe dehydration degraded phospholipids and caused membrane leakage, but PA and MGDG fluctuated less. The key genes of lipid metabolism, DGAT and PAP, were actively transcribed, suggesting that PA was one of the main DAG sources for TAG synthesis. This work proves that Physcomitrella patens adopts high-constitutive PC and PI similar to plant seeds, abundant TAG, and its own specific MGDG to resist extreme dehydration. This result provides a new insight into the lipid evolution of early terrestrial plants against unfavorable terrestrial environments.
Collapse
Affiliation(s)
- Yingchun Wang
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Jianan Zhai
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Zhenyu Qi
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Wanping Liu
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Jipeng Cui
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Xi Zhang
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Sulan Bai
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Li Li
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China
| | - Guanghou Shui
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Suxia Cui
- College of Life Sciences, Capital Normal University, Beijing, 100048, China; Beijing Key Laboratory of Plant Gene Resources and Biotechnology for Carbon Reduction and Environmental Improvement, Beijing, 100048, China.
| |
Collapse
|
8
|
Kwon E, Basnet P, Roy NS, Kim JH, Heo K, Park KC, Um T, Kim NS, Choi IY. Identification of resurrection genes from the transcriptome of dehydrated and rehydrated Selaginella tamariscina. PLANT SIGNALING & BEHAVIOR 2021; 16:1973703. [PMID: 34839799 PMCID: PMC9208788 DOI: 10.1080/15592324.2021.1973703] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Selaginella tamariscina is a lycophyta species that survives under extremely dry conditions via the mechanism of resurrection. This phenomenon involves the regulation of numerous genes that play vital roles in desiccation tolerance and subsequent rehydration. To identify resurrection-related genes, we analyzed the transcriptome between dehydration conditions and rehydration conditions of S. tamariscina. The de novo assembly generated 124,417 transcripts with an average size of 1,000 bp and 87,754 unigenes. Among these genes, 1,267 genes and 634 genes were up and down regulated by rehydration compared to dehydration. To understand gene function, we annotated Gene Ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG). The unigenes encoding early light-inducible protein (ELIP) were down-regulated, whereas pentatricopeptide repeat-containing protein (PPR), late embryogenesis abundant proteins (LEA), sucrose nonfermenting protein (SNF), trehalose phosphate phosphatase (TPP), trehalose phosphate synthase (TPS), and ABC transporter G family (ABCG) were significantly up-regulated in response to rehydration conditions by differentially expressed genes (DEGs) analysis. Several studies provide evidence that these genes play a role in stress environment. The ELIP and PPR genes are involved in chloroplast protection during dehydration and rehydration. LEA, SNF, and trehalose genes are known to be oxidant scavengers that protect the cell structure from the deleterious effect of drought. TPP and TPS genes were found in the starch and sucrose metabolism pathways, which are essential sugar-signaling metabolites regulating plant metabolism and other biological processes. ABC-G gene interacts with abscisic acid (ABA) phytohormone in the stomata opening during stress conditions. Our findings provide valuable information and candidate resurrection genes for future functional analysis aimed at improving the drought tolerance of crop plants.
Collapse
Affiliation(s)
- Eunchae Kwon
- Department of Molecular Bioscience, Kangwon National University, Chuncheon, Korea
| | - Prakash Basnet
- Department of Agriculture and Life Industry, Kangwon National University, Chuncheon, Korea
| | - Neha Samir Roy
- Department of Agriculture and Life Industry, Kangwon National University, Chuncheon, Korea
- Agriculture and Life Science Research Institute, Kangwon National University, Chuncheon, Korea
| | - Jong-Hwa Kim
- Department of Horticulture, Kangwon National University, Chuncheon, Korea
| | - Kweon Heo
- Department of Applied Plant Science, Kangwon National University, Chuncheon, Korea
| | - Kyong-Cheul Park
- Department of Agriculture and Life Industry, Kangwon National University, Chuncheon, Korea
| | - Taeyoung Um
- Department of Agriculture and Life Industry, Kangwon National University, Chuncheon, Korea
| | - Nam-Soo Kim
- Department of Molecular Bioscience, Kangwon National University, Chuncheon, Korea
- Institute of Bioscience and Biotechnology, Kangwon National University, Chuncheon, Korea
- CONTACT Nam-Soo Kim Department of Molecular Bioscience, Kangwon National University, Chuncheon, Korea
| | - Ik-Young Choi
- Department of Agriculture and Life Industry, Kangwon National University, Chuncheon, Korea
- Ik-Young Choi Department of Agriculture and Life Industry, Kangwon National University, Chuncheon, Korea
| |
Collapse
|
9
|
A Label-Free Proteomic and Complementary Metabolomic Analysis of Leaves of the Resurrection Plant Xerophytaschlechteri during Dehydration. Life (Basel) 2021; 11:life11111242. [PMID: 34833116 PMCID: PMC8624122 DOI: 10.3390/life11111242] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/08/2021] [Accepted: 11/09/2021] [Indexed: 11/17/2022] Open
Abstract
Vegetative desiccation tolerance, or the ability to survive the loss of ~95% relative water content (RWC), is rare in angiosperms, with these being commonly called resurrection plants. It is a complex multigenic and multi-factorial trait, with its understanding requiring a comprehensive systems biology approach. The aim of the current study was to conduct a label-free proteomic analysis of leaves of the resurrection plant Xerophyta schlechteri in response to desiccation. A targeted metabolomics approach was validated and correlated to the proteomics, contributing the missing link in studies on this species. Three physiological stages were identified: an early response to drying, during which the leaf tissues declined from full turgor to a RWC of ~80–70%, a mid-response in which the RWC declined to 40% and a late response where the tissues declined to 10% RWC. We identified 517 distinct proteins that were differentially expressed, of which 253 proteins were upregulated and 264 were downregulated in response to the three drying stages. Metabolomics analyses, which included monitoring the levels of a selection of phytohormones, amino acids, sugars, sugar alcohols, fatty acids and organic acids in response to dehydration, correlated with some of the proteomic differences, giving insight into the biological processes apparently involved in desiccation tolerance in this species.
Collapse
|
10
|
Gechev T, Lyall R, Petrov V, Bartels D. Systems biology of resurrection plants. Cell Mol Life Sci 2021; 78:6365-6394. [PMID: 34390381 PMCID: PMC8558194 DOI: 10.1007/s00018-021-03913-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 07/08/2021] [Accepted: 08/03/2021] [Indexed: 12/16/2022]
Abstract
Plant species that exhibit vegetative desiccation tolerance can survive extreme desiccation for months and resume normal physiological activities upon re-watering. Here we survey the recent knowledge gathered from the sequenced genomes of angiosperm and non-angiosperm desiccation-tolerant plants (resurrection plants) and highlight some distinct genes and gene families that are central to the desiccation response. Furthermore, we review the vast amount of data accumulated from analyses of transcriptomes and metabolomes of resurrection species exposed to desiccation and subsequent rehydration, which allows us to build a systems biology view on the molecular and genetic mechanisms of desiccation tolerance in plants.
Collapse
Affiliation(s)
- Tsanko Gechev
- Center of Plant Systems Biology and Biotechnology, 139 Ruski Blvd., Plovdiv, 4000, Bulgaria.
- Department of Plant Physiology and Molecular Biology, University of Plovdiv, 24 Tsar Assen Str., Plovdiv, 4000, Bulgaria.
| | - Rafe Lyall
- Center of Plant Systems Biology and Biotechnology, 139 Ruski Blvd., Plovdiv, 4000, Bulgaria
| | - Veselin Petrov
- Center of Plant Systems Biology and Biotechnology, 139 Ruski Blvd., Plovdiv, 4000, Bulgaria
- Department of Plant Physiology, Biochemistry and Genetics, Agricultural University - Plovdiv, 12, Mendeleev Str, Plovdiv, 4000, Bulgaria
| | | |
Collapse
|
11
|
Zhang A, Yang X, Lu J, Song F, Sun J, Wang C, Lian J, Zhao L, Zhao B. OsIAA20, an Aux/IAA protein, mediates abiotic stress tolerance in rice through an ABA pathway. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 308:110903. [PMID: 34034863 DOI: 10.1016/j.plantsci.2021.110903] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 03/25/2021] [Accepted: 03/30/2021] [Indexed: 05/04/2023]
Abstract
In plants, auxin and ABA play significant roles in conferring tolerance to environmental abiotic stresses. Earlier studies have been shown that some Aux/IAA genes, with important signaling factors in the auxin pathway, were induced in response to drought and other abiotic stresses. However, the mechanistic links between Aux/IAA expression and general drought response remain largely unknown. In this study, OsIAA20, a rice Aux/IAA protein, shown with important roles in abiotic stress. Phenotypic analyses revealed that OsIAA20 RNAi transgenic rice reduced drought and salt tolerance; whereas, OsIAA20 overexpression plants displayed the opposite phenotype. Physiological analyses of OsIAA20 RNAi rice grown under drought or salt stress showed that proline and chlorophyll content significantly decreased, while malondialdehyde content and the ratio of Na+/ K+ significantly increased. In addition, OsIAA20down-regulation reduced stomatal closure and increased the rate of water loss, while transgenic plants overexpressing OsIAA20 exhibited the opposite physiological responses. Furthermore, an ABA-responsive gene, OsRab21, was down-regulated in OsIAA20 RNAi rice lines and upregulated in OsIAA20 overexpression plants. Those results means OsIAA20 played an important role in plant drought and salt stress responses, by an ABA dependent mechanism, and it will be a candidate target gene used to breed abiotic stress tolerance.
Collapse
Affiliation(s)
- Aiyuan Zhang
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Xu Yang
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China; Boustead College, Tianjin University of Commerce, Jinjing Road 28, 300384, Tianjin, China
| | - Jia Lu
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Fangyuan Song
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Jinghuan Sun
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Cong Wang
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Juan Lian
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Lili Zhao
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China
| | - Baocun Zhao
- College of Life Science, Hebei Normal University, No.20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang 050024, Hebei, China.
| |
Collapse
|
12
|
Georgieva K, Mihailova G, Gigova L, Dagnon S, Simova-Stoilova L, Velitchkova M. The role of antioxidant defense in freezing tolerance of resurrection plant Haberlea rhodopensis. PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS : AN INTERNATIONAL JOURNAL OF FUNCTIONAL PLANT BIOLOGY 2021; 27:1119-1133. [PMID: 34108826 PMCID: PMC8140058 DOI: 10.1007/s12298-021-00998-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/19/2021] [Accepted: 04/20/2021] [Indexed: 05/24/2023]
Abstract
UNLABELLED Haberlea rhodopensis Friv. is unique with its ability to survive two extreme environmental stresses-desiccation to air-dry state and subzero temperatures. In contrast to desiccation tolerance, the mechanisms of freezing tolerance of resurrection plants are scarcely investigated. In the present study, the role of antioxidant defense in the acquisition of cold acclimation and freezing tolerance in this resurrection plant was investigated comparing the results of two sets of experiments-short term freezing stress after cold acclimation in controlled conditions and long term freezing stress as a part of seasonal temperature fluctuations in an outdoor ex situ experiment. Significant enhancement in flavonoids and anthocyanin content was observed only as a result of freezing-induced desiccation. The total amount of polyphenols increased upon cold acclimation and it was similar to the control in post freezing stress and freezing-induced desiccation. The main role of phenylethanoid glucoside, myconoside and hispidulin 8-C-(2-O-syringoyl-b-glucopyranoside) in cold acclimation and freezing tolerance was elucidated. The treatments under controlled conditions in a growth chamber showed enhancement in antioxidant enzymes activity upon cold acclimation but it declined after subsequent exposure to -10 °C. Although it varied under ex situ conditions, the activity of antioxidant enzymes was high, indicating their important role in overcoming oxidative stress under all treatments. In addition, the activity of specific isoenzymes was upregulated as compared to the control plants, which could be more useful for stress counteraction compared to changes in the total enzyme activity, due to the action of these isoforms in the specific cellular compartments. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s12298-021-00998-0.
Collapse
Affiliation(s)
- Katya Georgieva
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Akad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Gergana Mihailova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Akad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Liliana Gigova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Akad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Soleya Dagnon
- Department of Organic Chemistry, Plovdiv University Paisii Hilendarski, “Tzar Assen II” 24, 4000 Plovdiv, Bulgaria
| | - Lyudmila Simova-Stoilova
- Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Akad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| | - Maya Velitchkova
- Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
| |
Collapse
|
13
|
Nadal M, Perera-Castro AV, Gulías J, Farrant JM, Flexas J. Resurrection plants optimize photosynthesis despite very thick cell walls by means of chloroplast distribution. JOURNAL OF EXPERIMENTAL BOTANY 2021; 72:2600-2610. [PMID: 33483750 DOI: 10.1093/jxb/erab022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 01/18/2021] [Indexed: 06/12/2023]
Abstract
Resurrection plants are vascular species able to sustain extreme desiccation in their vegetative tissues. Despite its potential interest, the role of leaf anatomy in CO2 diffusion and photosynthesis under non-stressed conditions has not been explored in these species. Net CO2 assimilation (An) and its underlying diffusive, biochemical, and anatomical determinants were assessed in 10 resurrection species from diverse locations, including ferns, and homoiochlorophyllous and poikilochlorophyllous angiosperms. Data obtained were compared with previously published results in desiccation-sensitive ferns and angiosperms. An in resurrection plants was mostly driven by mesophyll conductance to CO2 (gm) and limited by CO2 diffusion. Resurrection species had a greater cell wall thickness (Tcw) than desiccation-sensitive plants, a feature associated with limited CO2 diffusion in the mesophyll, but also greater chloroplast exposure to intercellular spaces (Sc), which usually leads to higher gm. This combination enabled a higher An per Tcw compared with desiccation-sensitive species. Resurrection species possess unusual anatomical features that could confer stress tolerance (thick cell walls) without compromising the photosynthetic capacity (high chloroplast exposure). This mechanism is particularly successful in resurrection ferns, which display higher photosynthesis than their desiccation-sensitive counterparts.
Collapse
Affiliation(s)
- Miquel Nadal
- Research Group on Plant Biology under Mediterranean Conditions, Departament de Biologia, Universitat de les Illes Balears (UIB), INAGEA, Carretera de Valldemossa Km 7.5, 07122 Palma de Mallorca, Illes Balears, Spain
| | - Alicia V Perera-Castro
- Research Group on Plant Biology under Mediterranean Conditions, Departament de Biologia, Universitat de les Illes Balears (UIB), INAGEA, Carretera de Valldemossa Km 7.5, 07122 Palma de Mallorca, Illes Balears, Spain
| | - Javier Gulías
- Research Group on Plant Biology under Mediterranean Conditions, Departament de Biologia, Universitat de les Illes Balears (UIB), INAGEA, Carretera de Valldemossa Km 7.5, 07122 Palma de Mallorca, Illes Balears, Spain
| | - Jill M Farrant
- Department of Molecular and Cell Biology, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
| | - Jaume Flexas
- Research Group on Plant Biology under Mediterranean Conditions, Departament de Biologia, Universitat de les Illes Balears (UIB), INAGEA, Carretera de Valldemossa Km 7.5, 07122 Palma de Mallorca, Illes Balears, Spain
| |
Collapse
|
14
|
Marks RA, Farrant JM, Nicholas McLetchie D, VanBuren R. Unexplored dimensions of variability in vegetative desiccation tolerance. AMERICAN JOURNAL OF BOTANY 2021; 108:346-358. [PMID: 33421106 DOI: 10.1002/ajb2.1588] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 08/03/2020] [Indexed: 06/12/2023]
Abstract
Desiccation tolerance has evolved recurrently across diverse land plant lineages as an adaptation for survival in regions where seasonal rainfall drives periodic drying of vegetative tissues. Growing interest in this phenomenon has fueled recent physiological, biochemical, and genomic insights into the mechanistic basis of desiccation tolerance. Although, desiccation tolerance is often viewed as binary and monolithic, substantial variation exists in the phenotype and underlying mechanisms across diverse lineages, heterogeneous populations, and throughout the development of individual plants. Most studies have focused on conserved responses in a subset desiccation-tolerant plants under laboratory conditions. Consequently, the variability and natural diversity of desiccation-tolerant phenotypes remains largely uncharacterized. Here, we discuss the natural variation in desiccation tolerance and argue that leveraging this diversity can improve our mechanistic understanding of desiccation tolerance. We summarize information collected from ~600 desiccation-tolerant land plants and discuss the taxonomic distribution and physiology of desiccation responses. We point out the need to quantify natural diversity of desiccation tolerance on three scales: variation across divergent lineages, intraspecific variation across populations, and variation across tissues and life stages of an individual plant. We conclude that this variability should be accounted for in experimental designs and can be leveraged for deeper insights into the intricacies of desiccation tolerance.
Collapse
Affiliation(s)
- Rose A Marks
- Department of Horticulture, Michigan State University, East Lansing, MI, 48824, USA
- Plant Resilience Institute, Michigan State University, East Lansing, MI, 48824, USA
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, 7701, South Africa
| | - Jill M Farrant
- Department of Molecular and Cell Biology, University of Cape Town, Rondebosch, 7701, South Africa
| | | | - Robert VanBuren
- Department of Horticulture, Michigan State University, East Lansing, MI, 48824, USA
- Plant Resilience Institute, Michigan State University, East Lansing, MI, 48824, USA
| |
Collapse
|
15
|
Singh KK, Saha S, Kadiravana RC, Mazumdar D, Rai V, Ghosh S. Ammonium metabolism in Selaginella bryopteris in response to dehydration-rehydration and characterisation of desiccation tolerant, thermostable, cytosolic glutamine synthetase from plant. FUNCTIONAL PLANT BIOLOGY : FPB 2021; 48:257-267. [PMID: 33059817 DOI: 10.1071/fp20144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
Water deficit (WD) has adverse effects on plant growth, and acclimation requires responses allowing primary metabolism to continue. Resurrection plants can serve as model system to gain insight into metabolic regulation during WD. We herein report the response of a resurrection lycophyte, Selaginella bryopteris, to dehydration-rehydration cycle with emphasis on ammonium metabolism. Dehydration of S. bryopteris fronds resulted in decrease of total protein and increase of free ammonium levels and the effect was reversed on rehydration. The proline content increased twice after 24 h of dehydration, which again recovered to background levels comparable to that at full turgor state. The specific activity of glutamine synthetase (GS) didn't change significantly till 6 h and then declined by 21% after 24 h of dehydration, whereas specific activities of glutamate synthase (GOGAT) and aminating glutamate dehydrogenase (GDH) were enhanced significantly during dehydration. The deaminating activity of GDH also increased during dehydration albeit at a slower rate. Immunoblot analysis indicated overexpression of GS and GDH polypeptides during dehydration and their levels declined on rehydration. The results suggested significant role of GDH along with GS/GOGAT in production of nitrogen-rich amino acids for desiccation tolerance. Unlike higher plants S. bryopteris expressed GS only in cytosol. The enzyme had pH and temperature optima of 5.5 and 60°C, respectively, and it retained 96% activity on preincubation at 60°C for 30 min indicating thermostability. Hence, like higher plants the cytosolic GS from S. bryopteris has a conserved role in stress tolerance.
Collapse
Affiliation(s)
- Kamal K Singh
- Department of Biotechnology, University of North Bengal, Raja Rammohunpur, Siliguri-734013, India
| | - Shyamaprasad Saha
- Department of Microbiology, University of North Bengal, Raja Rammohunpur, Siliguri-734013, India
| | - Ram C Kadiravana
- Department of Biotechnology, University of North Bengal, Raja Rammohunpur, Siliguri-734013, India
| | - Deepika Mazumdar
- Department of Biotechnology, University of North Bengal, Raja Rammohunpur, Siliguri-734013, India
| | - Vijeta Rai
- Department of Biotechnology, University of North Bengal, Raja Rammohunpur, Siliguri-734013, India
| | - Shilpi Ghosh
- Department of Biotechnology, University of North Bengal, Raja Rammohunpur, Siliguri-734013, India; and Corresponding author. ;
| |
Collapse
|
16
|
Henry JS, Lopez RA, Renzaglia KS. Differential localization of cell wall polymers across generations in the placenta of Marchantia polymorpha. JOURNAL OF PLANT RESEARCH 2020; 133:911-924. [PMID: 33106966 PMCID: PMC8192078 DOI: 10.1007/s10265-020-01232-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2020] [Accepted: 10/12/2020] [Indexed: 06/11/2023]
Abstract
To further knowledge on cell wall composition in early land plants, we localized cell wall constituents in placental cells of the liverwort Marchantia polymorpha L. using monoclonal antibodies (MAbs) in the transmission electron microscope and histochemical staining. The placenta of M. polymorpha is similar to the majority of bryophytes in that both generations contain transfer cells with extensive wall ingrowths. Although the four major cell wall polymers, i.e., cellulose, pectins, hemicelluloses, and arabinogalactan proteins, are present, there are variations in the richness and specificity across generations. An abundance of homogalacturonan pectins in all placental cell walls is consistent with maintaining cell wall permeability and an acidic apoplastic pH necessary for solute transport. Although similar in ultrastructure, transfer cell walls on the sporophyte side in M. polymorpha are enriched with xyloglucans and diverse AGPs not detected on the gametophyte side of the placenta. Gametophyte wall ingrowths are more uniform in polymer composition. Lastly, extensins and callose are not components of transfer cell walls of M. polymorpha, which deviates from studies on transfer cells in other plants. The difference in polymer localizations in transfer cell walls between generations is consistent with directional movement from gametophyte to sporophyte in this liverwort.
Collapse
Affiliation(s)
- Jason S Henry
- Department of Plant Biology, Southern Illinois University Carbondale, MC:6509, Carbondale, IL 62901, USA.
| | - Renee A Lopez
- Department of Plant Biology, Southern Illinois University Carbondale, MC:6509, Carbondale, IL 62901, USA
| | - Karen S Renzaglia
- Department of Plant Biology, Southern Illinois University Carbondale, MC:6509, Carbondale, IL 62901, USA
| |
Collapse
|
17
|
Shared up-regulation and contrasting down-regulation of gene expression distinguish desiccation-tolerant from intolerant green algae. Proc Natl Acad Sci U S A 2020; 117:17438-17445. [PMID: 32636259 PMCID: PMC7382218 DOI: 10.1073/pnas.1906904117] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Among green plants, desiccation tolerance is common in seeds and spores but rare in leaves and other vegetative green tissues. Over the last two decades, genes have been identified whose expression is induced by desiccation in diverse, desiccation-tolerant (DT) taxa, including, e.g., late embryogenesis abundant proteins (LEA) and reactive oxygen species scavengers. This up-regulation is observed in DT resurrection plants, mosses, and green algae most closely related to these Embryophytes. Here we test whether this same suite of protective genes is up-regulated during desiccation in even more distantly related DT green algae, and, importantly, whether that up-regulation is unique to DT algae or also occurs in a desiccation-intolerant relative. We used three closely related aquatic and desert-derived green microalgae in the family Scenedesmaceae and capitalized on extraordinary desiccation tolerance in two of the species, contrasting with desiccation intolerance in the third. We found that during desiccation, all three species increased expression of common protective genes. The feature distinguishing gene expression in DT algae, however, was extensive down-regulation of gene expression associated with diverse metabolic processes during the desiccation time course, suggesting a switch from active growth to energy-saving metabolism. This widespread downshift did not occur in the desiccation-intolerant taxon. These results show that desiccation-induced up-regulation of expression of protective genes may be necessary but is not sufficient to confer desiccation tolerance. The data also suggest that desiccation tolerance may require induced protective mechanisms operating in concert with massive down-regulation of gene expression controlling numerous other aspects of metabolism.
Collapse
|
18
|
Sahin F, Oznurhan F. Antibacterial efficacy and remineralization capacity of glycyrrhizic acid added casein phosphopeptide-amorphous calcium phosphate. Microsc Res Tech 2020; 83:744-754. [PMID: 32191375 DOI: 10.1002/jemt.23465] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 02/07/2020] [Accepted: 02/11/2020] [Indexed: 12/16/2022]
Abstract
The aim was to evaluate remineralization capacity and antibacterial efficiency of Tooth Mousse and various amounts of glycyrrhizic acid added Tooth Mousse on primary tooth enamel. Three groups were formed; Group 1 (CPP-ACP), Group 2 (CPP-ACP + 5% glycyrrhizic acid), and Group 3 (CPP-ACP + 10% glycyrrhizic acid) in order to evaluate remineralization capacity. Enamel samples were immersed in demineralization solution and then remineralization agents were applied. Surface microhardness and SEM analyses were performed at the beginning, after demineralization and remineralization. For antibacterial tests, four groups were formed; Group 1, Group 2 and Group 3 and Group 4 (control). Biofilms were then exposed to 10% sucrose eight times per day for 7 days. After biofilm growth period, samples were treated with materials to evaluate antibacterial efficiency except control group. After application of materials, samples were incubated 2 more days at 37°C and at the end of this period, absorbance values of biofilms were determined and data were analyzed. An increase in microhardness values was Group 2 > Group 3 > Group 1, respectively, but there were no significant differences. After remineralization, microhardness values showed significant increases when compared to demineralized groups, but there was no significant difference. All groups showed decreased absorbance value of biofilm when compared with control group but they were insignificant. It was observed that both in Group 2 and Group 3, glycyrrhizic acid did not have a negative effect on remineralization and although they have an increase, it was insignificant. Although glycyrrhizic acid added CPP-ACP groups showed increased antibacterial activity, they were not statistically significant.
Collapse
Affiliation(s)
- Feride Sahin
- Department of Pediatric Dentistry, Faculty of Dentistry, Sivas Cumhuriyet University, Sivas, Turkey
| | - Fatih Oznurhan
- Department of Pediatric Dentistry, Faculty of Dentistry, Sivas Cumhuriyet University, Sivas, Turkey
| |
Collapse
|
19
|
Sajjad S, Ha JS, Seo SH, Yoon TS, Oh HM, Lee HG, Kang S. Differential proteomic analyses of green microalga Ettlia sp. at various dehydration levels. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 146:198-210. [PMID: 31756606 DOI: 10.1016/j.plaphy.2019.11.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 11/05/2019] [Accepted: 11/10/2019] [Indexed: 06/10/2023]
Abstract
Water deprivation could be a lethal stress for aquatic and aero-terrestrial organisms. Ettlia sp. is a unicellular photosynthetic freshwater microalga. In the present study, proteomic alterations and physiological characteristics of Ettlia sp. were analyzed to comprehend the molecular changes in dehydrated conditions. Varying levels of dehydration were achieved by incubating drained Ettlia sp. in different relative humidity environments for 24 hours. Using a comparative proteomic analysis, 52 differentially expressed protein spots were identified that could be divided into eight functional groups. The PCA analysis of normalized protein expression values demonstrated a clear segregation of protein expression profiles among different dehydration levels. Identified proteins could be grouped into four clusters based on their expression profiles. Proteins relating to photosynthesis comprised the largest group with 25% of the identified proteins that were decreased in dehydrated samples and belonged to cluster I. The photosynthetic activities were measured with rehydrated Ettlia sp. These results revealed that photosynthesis remained inhibited over extended time in response to dehydration. The expressions of reactive oxygen species (ROS) scavenger proteins increased in strong dehydration and were assigned to cluster III. Carbon metabolism proteins were suppressed, which might limit energy consumption, whereas glycolysis was activated at mild dehydration. The accumulation of desiccation-associated late embryogenesis proteins might inhibit the aggregation of housekeeping proteins. DNA protective proteins were expressed higher in the dehydrated state, which might reduce DNA damage, and membrane-stabilizing proteins increased in abundance in desiccation. These findings provide an understanding of Ettlia's adaptation and survival capabilities in a dehydrated state.
Collapse
Affiliation(s)
- Saba Sajjad
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea; KRIBB School of Bioscience, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Ji-San Ha
- Cell Factory Research Center, KRIBB, Daejeon, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea; Department of Biological Sciences, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Republic of Korea
| | - Seong-Hyun Seo
- Cell Factory Research Center, KRIBB, Daejeon, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea; Department of Life Science, Hanyang University, Haengdang 1-dong, Seongdong-gu, Seoul, Republic of Korea
| | - Tae-Sung Yoon
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea; KRIBB School of Bioscience, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Hee-Mock Oh
- Cell Factory Research Center, KRIBB, Daejeon, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea; KRIBB School of Bioscience, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea
| | - Hyung-Gwan Lee
- Cell Factory Research Center, KRIBB, Daejeon, Korea Research Institute of Bioscience and Biotechnology (KRIBB) 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
| | - Sunghyun Kang
- Disease Target Structure Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea; KRIBB School of Bioscience, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
| |
Collapse
|
20
|
Lin CT, Xu T, Xing SL, Zhao L, Sun RZ, Liu Y, Moore JP, Deng X. Weighted Gene Co-expression Network Analysis (WGCNA) Reveals the Hub Role of Protein Ubiquitination in the Acquisition of Desiccation Tolerance in Boea hygrometrica. PLANT & CELL PHYSIOLOGY 2019; 60:2707-2719. [PMID: 31410481 DOI: 10.1093/pcp/pcz160] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 08/06/2019] [Indexed: 05/28/2023]
Abstract
Boea hygrometrica can survive extreme drought conditions and has been used as a model to study desiccation tolerance. A genome-wide transcriptome analysis of B. hygrometrica showed that the plant can survive rapid air-drying after experiencing a slow soil-drying acclimation phase. In addition, a weighted gene co-expression network analysis was used to study the transcriptomic datasets. A network comprising 22 modules was constructed, and seven modules were found to be significantly related to desiccation response using an enrichment analysis. Protein ubiquitination was observed to be a common process linked to hub genes in all the seven modules. Ubiquitin-modified proteins with diversified functions were identified using immunoprecipitation coupled with mass spectrometry. The lowest level of ubiquitination was noted at the full soil drying priming stage, which coincided the accumulation of dehydration-responsive gene BhLEA2. The highly conserved RY motif (CATGCA) was identified from the promoters of ubiquitin-related genes that were downregulated in the desiccated samples. An in silico gene expression analysis showed that the negative regulation of ubiquitin-related genes is potentially mediated via a B3 domain-containing transcription repressor VAL1. This study suggests that priming may involve the transcriptional regulation of several major processes, and the transcriptional regulation of genes in protein ubiquitination may play a hub role to deliver acclimation signals to posttranslational level in the acquisition of desiccation tolerance in B. hygrometrica.
Collapse
Affiliation(s)
- Chih-Ta Lin
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Tao Xu
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Shi-Lai Xing
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Li Zhao
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Run-Ze Sun
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - Yang Liu
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| | - John Paul Moore
- Department of Viticulture and Oenology, Institute for Wine Biotechnology, Stellenbosch University, Matieland 7602, South Africa
| | - Xin Deng
- Key Laboratory of Plant Resources and Beijing Botanical Garden, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China
| |
Collapse
|
21
|
Hell AF, Kretzschmar FS, Simões K, Heyer AG, Barbedo CJ, Braga MR, Centeno DC. Metabolic Changes on the Acquisition of Desiccation Tolerance in Seeds of the Brazilian Native Tree Erythrina speciosa. FRONTIERS IN PLANT SCIENCE 2019; 10:1356. [PMID: 31708957 PMCID: PMC6819373 DOI: 10.3389/fpls.2019.01356] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 10/02/2019] [Indexed: 05/31/2023]
Abstract
Erythrina speciosa Andrews (Fabaceae) is a native tree of Atlantic forest from Southern and Southeastern Brazil. Although this species is found in flooded areas, it produces highly desiccation tolerant seeds. Here, we investigated the physiological and metabolic events occurring during seed maturation of E. speciosa aiming to better understand of its desiccation tolerance acquisition. Seeds were separated into six stages of maturation by the pigmentation of the seed coat. Water potential (WP) and water content (WC) decreased gradually from the first stage to the last stage of maturation (VI), in which seeds reached the highest accumulation of dry mass and seed coat acquired water impermeability. At stage III (71% WC), although seeds were intolerant to desiccation, they were able to germinate (about 15%). Desiccation tolerance was first observed at stage IV (67% WC), in which 40% of seeds were tolerant. At stage V (24% WC), all seeds were tolerant to desiccation and at stage VI all seeds germinated. Increased deposition of the arabinose-containing polysaccharides, which are known as cell wall plasticizers polymers, was observed up to stage IV of seed maturation. Raffinose and stachyose gradually increased in axes and cotyledons with greater increment in the fourth stage. Metabolic profile analysis showed that levels of sugars, organic, and amino acids decrease drastically in embryonic axes, in agreement with lower respiratory rates during maturation. Moreover, a non-aqueous fractionation revealed a change on the proportions of sugar accumulation among cytosol, plastid, and vacuoles between the active metabolism (stage I) and the dormant seeds (stage VI). The results indicate that the physiological maturity of the seeds of E. speciosa is reached at stage V and that the accumulation of raffinose can be a result of the change in the use of carbon, reducing metabolic activity during maturation. This work confirms that raffinose is involved in desiccation tolerance in seeds of E. speciosa, especially considering the different subcellular compartments and suggests even that the acquisition of desiccation tolerance in this species occurs in stages prior to the major changes in WC.
Collapse
Affiliation(s)
- Aline F. Hell
- Curso de Pós-Graduação em Biodiversidade e Meio Ambiente do Instituto de Botânica de São Paulo, São Paulo, Brazil
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, São Bernardo do Campo, Brazil
| | - Fernanda S. Kretzschmar
- Programa de Pós-Graduação em Biologia Celular e Estrutural, Universidade Estadual de Campinas (Unicamp), Campinas, Brazil
| | | | - Arnd G. Heyer
- Department of Plant Biotechnology, Universität Stuttgart, Stuttgart, Germany
| | - Claudio J. Barbedo
- Núcleo de Pesquisa em Sementes, Instituto de Botânica, São Paulo, Brazil
| | - Marcia R. Braga
- Núcleo de Pesquisa em Fisiologia e Bioquímica, Instituto de Botânica, São Paulo, Brazil
| | - Danilo C. Centeno
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, São Bernardo do Campo, Brazil
| |
Collapse
|
22
|
Liu J, Moyankova D, Djilianov D, Deng X. Common and Specific Mechanisms of Desiccation Tolerance in Two Gesneriaceae Resurrection Plants. Multiomics Evidences. FRONTIERS IN PLANT SCIENCE 2019; 10:1067. [PMID: 31552070 PMCID: PMC6737074 DOI: 10.3389/fpls.2019.01067] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 08/07/2019] [Indexed: 05/06/2023]
Abstract
Environmental stress, especially water deficiency, seriously limits plant distribution and crop production worldwide. A small group of vascular angiosperm plants termed "resurrection plants," possess desiccation tolerance (DT) to withstand dehydration and to recover fully upon rehydration. In recent years, with the rapid development of life science in plants different omics technologies have been widely applied in resurrection plants to study DT. Boea hygrometrica is native in East and Southeast Asia, and Haberlea rhodopensis is endemic to the Balkans in Europe. They are both resurrection pants from Gesneriaceae family. This paper reviews recent advances in transcriptome and metabolome, and discusses the differences and similarities of DT features between both species. Finally, we believe we provide novel insights into understanding the mechanisms underlying the acquisition and evolution of desiccation tolerance of the resurrection plants that could substantially contribute to develop new approaches for agriculture to overcome water deficiency in future.
Collapse
Affiliation(s)
- Jie Liu
- Facility Horticulture Laboratory of Universities in Shandong, Weifang University of Science and Technology, Shouguang, China
- Key Laboratory of Plant Resource, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| | - Daniela Moyankova
- Abiotic Stress Group, Agrobioinstitute, Agricultural Academy, Sofia, Bulgaria
| | - Dimitar Djilianov
- Abiotic Stress Group, Agrobioinstitute, Agricultural Academy, Sofia, Bulgaria
| | - Xin Deng
- Key Laboratory of Plant Resource, Institute of Botany, Chinese Academy of Sciences, Beijing, China
| |
Collapse
|
23
|
Marinho JP, Coutinho ID, da Fonseca Lameiro R, Marin SRR, Colnago LA, Nakashima K, Yamaguchi-Shinozaki K, Nepomuceno AL, Mertz-Henning LM. Metabolic alterations in conventional and genetically modified soybean plants with GmDREB2A;2 FL and GmDREB2A;2 CA transcription factors during water deficit. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 140:122-135. [PMID: 31100705 DOI: 10.1016/j.plaphy.2019.04.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 04/18/2019] [Accepted: 04/30/2019] [Indexed: 06/09/2023]
Abstract
Water deficit is one of the main abiotic stress that affects plant growth and productivity. The GmDREB2A;2 (Glyma14g06080) gene is an important transcription factor involved in regulating the plants' responses under water deficit. In previous studies, soybean plants overexpressing full-length (GmDREB2A;2 FL) and constitutively active (GmDREB2A;2 CA) forms of the GmDREB2A;2 gene, presented higher tolerance to water deficit when compared with the conventional cultivar BRS 283. Therefore, identifying the changes in metabolite profile in these tolerant genotypes can contribute to the understanding of the metabolic pathways involved in the tolerance mechanism. In this work, the metabolic changes in roots and leaves of genetically modified (GM) soybean plants subjected to water deficit were elucidated by 1H-NMR spectroscopy. Three events were analyzed, one containing the gene in FL form (GmDREB2A;2 FL) and two presenting its CA form (GmDREB2A;2 CA-1 and GmDREB2A;2 CA-2) and compared with the conventional cultivar BRS 283. The results indicated different responses between leaves and roots for all genotypes. Most of these metabolic variations were related to carbohydrate and amino acid pathways. BRS 283 stood out with higher accumulation of amino acids in leaves under water deficit. The results also showed that the events GmDREB2A;2 FL and GmDREB2A;2 CA-1 presented higher concentrations of β-glucose and fructose in leaves, whereas BRS 283 accumulated more sucrose and pinitol. In roots, the GM events accumulated higher β-glucose, fructose, asparagine and phenylalanine, when compared with the conventional cultivar. These insights can add information on how the transcription factor (TF) DREB2A acts in soybean plants triggering and controlling a network of complex responses to drought.
Collapse
Affiliation(s)
- Juliane Prela Marinho
- Department of General Biology, Londrina State University, Londrina, PR, Brazil; Embrapa Soja, Rodovia Carlos João Strass, Acesso Orlando Amaral, Warta, PO. Box 231, 86001-970, Londrina, PR, Brazil
| | - Isabel Duarte Coutinho
- Embrapa Instrumentação, Rua XV de Novembro, 1452, 13560-970, São Carlos, São Paulo, Brazil
| | - Rafael da Fonseca Lameiro
- São Carlos Institute of Chemistry, University of São Paulo, Avenida Trabalhador São Carlense, 400, 13566-590, São Carlos, Brazil
| | - Silvana Regina Rockenbach Marin
- Department of General Biology, Londrina State University, Londrina, PR, Brazil; Embrapa Soja, Rodovia Carlos João Strass, Acesso Orlando Amaral, Warta, PO. Box 231, 86001-970, Londrina, PR, Brazil
| | - Luiz Alberto Colnago
- Embrapa Instrumentação, Rua XV de Novembro, 1452, 13560-970, São Carlos, São Paulo, Brazil
| | - Kazuo Nakashima
- Japan International Research Center for Agricultural Sciences (JIRCAS), Tsukuba, Ibaraki, 305-8686, Japan
| | - Kazuko Yamaguchi-Shinozaki
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8657, Japan
| | - Alexandre Lima Nepomuceno
- Embrapa Soja, Rodovia Carlos João Strass, Acesso Orlando Amaral, Warta, PO. Box 231, 86001-970, Londrina, PR, Brazil
| | - Liliane Marcia Mertz-Henning
- Embrapa Soja, Rodovia Carlos João Strass, Acesso Orlando Amaral, Warta, PO. Box 231, 86001-970, Londrina, PR, Brazil.
| |
Collapse
|
24
|
Zamora-Briseño JA, Pereira-Santana A, Reyes-Hernández SJ, Castaño E, Rodríguez-Zapata LC. Global Dynamics in Protein Disorder during Maize Seed Development. Genes (Basel) 2019; 10:genes10070502. [PMID: 31262071 PMCID: PMC6678312 DOI: 10.3390/genes10070502] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 06/24/2019] [Accepted: 06/25/2019] [Indexed: 01/31/2023] Open
Abstract
Intrinsic protein disorder is a physicochemical attribute of some proteins lacking tridimensional structure and is collectively known as intrinsically disordered proteins (IDPs). Interestingly, several IDPs have been associated with protective functions in plants and with their response to external stimuli. To correlate the modulation of the IDPs content with the developmental progression in seed, we describe the expression of transcripts according to the disorder content of the proteins that they codify during seed development, from the early embryogenesis to the beginning of the desiccation tolerance acquisition stage. We found that the total expression profile of transcripts encoding for structured proteins is highly increased during middle phase. However, the relative content of protein disorder is increased as seed development progresses. We identified several intrinsically disordered transcription factors that seem to play important roles throughout seed development. On the other hand, we detected a gene cluster encoding for IDPs at the end of the late phase, which coincides with the beginning of the acquisition of desiccation tolerance. In conclusion, the expression pattern of IDPs is highly dependent on the developmental stage, and there is a general reduction in the expression of transcripts encoding for structured proteins as seed development progresses. We proposed maize seeds as a model to study the regulation of protein disorder in plant development and its involvement in the acquisition of desiccation tolerance in plants.
Collapse
Affiliation(s)
- Jesús Alejandro Zamora-Briseño
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán, Calle 43, número 130, Chuburná de Hidalgo, CP 97205, Mérida, Yucatán, México
| | - Alejandro Pereira-Santana
- Centro de Investigación y Asistencia en Tecnología y Diseño del estado de Jalisco. División de Biotecnología Industrial. Camino Arenero 1227, El Bajío, Zapopan, Jalisco. C.P. 45019
| | - Sandi Julissa Reyes-Hernández
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán, Calle 43, número 130, Chuburná de Hidalgo, CP 97205, Mérida, Yucatán, México
| | - Enrique Castaño
- Unidad de Bioquímica y Biología Molecular de Plantas, Centro de Investigación Científica de Yucatán, Calle 43, número 130, Chuburná de Hidalgo, CP 97205, Mérida, Yucatán, México
| | - Luis Carlos Rodríguez-Zapata
- Unidad de Biotecnología, Centro de Investigación Científica de Yucatán, Calle 43, número 130, Chuburná de Hidalgo, CP 97205, Mérida, Yucatán, México.
| |
Collapse
|
25
|
Wang W, Qiu X, Yang Y, Kim HS, Jia X, Yu H, Kwak SS. Sweetpotato bZIP Transcription Factor IbABF4 Confers Tolerance to Multiple Abiotic Stresses. FRONTIERS IN PLANT SCIENCE 2019; 10:630. [PMID: 31156685 PMCID: PMC6531819 DOI: 10.3389/fpls.2019.00630] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Accepted: 04/26/2019] [Indexed: 05/03/2023]
Abstract
The abscisic acid (ABA)-responsive element binding factors (ABFs) play important regulatory roles in multiple abiotic stresses responses. However, information on the stress tolerance functions of ABF genes in sweetpotato (Ipomoea batatas [L.] Lam) remains limited. In the present study, we isolated and functionally characterized the sweetpotato IbABF4 gene, which encodes an abiotic stress-inducible basic leucine zipper (bZIP) transcription factor. Sequence analysis showed that the IbABF4 protein contains a typical bZIP domain and five conserved Ser/Thr kinase phosphorylation sites (RXXS/T). The IbABF4 gene was constitutively expressed in leaf, petiole, stem, and root, with the highest expression in storage root body. Expression of IbABF4 was induced by ABA and several environmental stresses including drought, salt, and heat shock. The IbABF4 protein localized to the nucleus, exhibited transcriptional activation activity, and showed binding to the cis-acting ABA-responsive element (ABRE) in vitro. Overexpression of IbABF4 in Arabidopsis thaliana not only increased ABA sensitivity but also enhanced drought and salt stress tolerance. Furthermore, transgenic sweetpotato plants (hereafter referred to as SA plants) overexpressing IbABF4, generated in this study, exhibited increased tolerance to drought, salt, and oxidative stresses on the whole plant level. This phenotype was associated with higher photosynthetic efficiency and lower malondialdehyde and hydrogen peroxide content. Levels of endogenous ABA content and ABA/stress-responsive gene expression were significantly upregulated in transgenic Arabidopsis and sweetpotato plants compared with wild-type plants under drought stress. Our results suggest that the expression of IbABF4 in Arabidopsis and sweetpotato enhances tolerance to multiple abiotic stresses through the ABA signaling pathway.
Collapse
Affiliation(s)
- Wenbin Wang
- College of Life Science, Shanxi Agricultural University, Taigu, China
| | - Xiangpo Qiu
- College of Life Science, Shanxi Agricultural University, Taigu, China
| | - Yanxin Yang
- College of Arts and Science, Shanxi Agricultural University, Taigu, China
| | - Ho Soo Kim
- Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| | - Xiaoyun Jia
- College of Life Science, Shanxi Agricultural University, Taigu, China
| | - Huan Yu
- College of Life Science, Shanxi Agricultural University, Taigu, China
| | - Sang-Soo Kwak
- Plant Systems Engineering Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea
| |
Collapse
|
26
|
De Ollas C, Morillón R, Fotopoulos V, Puértolas J, Ollitrault P, Gómez-Cadenas A, Arbona V. Facing Climate Change: Biotechnology of Iconic Mediterranean Woody Crops. FRONTIERS IN PLANT SCIENCE 2019; 10:427. [PMID: 31057569 PMCID: PMC6477659 DOI: 10.3389/fpls.2019.00427] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 03/21/2019] [Indexed: 05/03/2023]
Abstract
The Mediterranean basin is especially sensitive to the adverse outcomes of climate change and especially to variations in rainfall patterns and the incidence of extremely high temperatures. These two concurring adverse environmental conditions will surely have a detrimental effect on crop performance and productivity that will be particularly severe on woody crops such as citrus, olive and grapevine that define the backbone of traditional Mediterranean agriculture. These woody species have been traditionally selected for traits such as improved fruit yield and quality or alteration in harvesting periods, leaving out traits related to plant field performance. This is currently a crucial aspect due to the progressive and imminent effects of global climate change. Although complete genome sequence exists for sweet orange (Citrus sinensis) and clementine (Citrus clementina), olive tree (Olea europaea) and grapevine (Vitis vinifera), the development of biotechnological tools to improve stress tolerance still relies on the study of the available genetic resources including interspecific hybrids, naturally occurring (or induced) polyploids and wild relatives under field conditions. To this respect, post-genomic era studies including transcriptomics, metabolomics and proteomics provide a wide and unbiased view of plant physiology and biochemistry under adverse environmental conditions that, along with high-throughput phenotyping, could contribute to the characterization of plant genotypes exhibiting physiological and/or genetic traits that are correlated to abiotic stress tolerance. The ultimate goal of precision agriculture is to improve crop productivity, in terms of yield and quality, making a sustainable use of land and water resources under adverse environmental conditions using all available biotechnological tools and high-throughput phenotyping. This review focuses on the current state-of-the-art of biotechnological tools such as high throughput -omics and phenotyping on grapevine, citrus and olive and their contribution to plant breeding programs.
Collapse
Affiliation(s)
- Carlos De Ollas
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Castellón de la Plana, Spain
| | - Raphaël Morillón
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), Petit-Bourg, France
| | - Vasileios Fotopoulos
- Department of Agricultural Sciences, Biotechnology and Food Science, Cyprus University of Technology, Limassol, Cyprus
| | - Jaime Puértolas
- Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom
| | - Patrick Ollitrault
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD), San-Giuliano, France
| | - Aurelio Gómez-Cadenas
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Castellón de la Plana, Spain
| | - Vicent Arbona
- Departament de Ciències Agràries i del Medi Natural, Universitat Jaume I, Castellón de la Plana, Spain
| |
Collapse
|
27
|
Yang M, Geng M, Shen P, Chen X, Li Y, Wen X. Effect of post-silking drought stress on the expression profiles of genes involved in carbon and nitrogen metabolism during leaf senescence in maize (Zea mays L.). PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 135:304-309. [PMID: 30599307 DOI: 10.1016/j.plaphy.2018.12.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Revised: 12/02/2018] [Accepted: 12/24/2018] [Indexed: 05/23/2023]
Abstract
Drought stress during reproductive growth stages greatly affects the growth and productivity of maize plants. To better understand the metabolic regulation during post-silking drought (PD) stress, an RNA sequencing (RNA-Seq) analysis was performed at the late stage of leaf senescence in maize. Physiological measurements showed that PD stress reduced both leaf carbon and nitrogen levels. A total of 4013 differentially expressed genes (DEGs) were found based on RNA-Seq analysis, 115 of which were identified to be involved in photosynthesis and in the metabolism of sucrose, starch, and amino acids. Among these DEGs, 14 genes involved in photosynthesis were down-regulated. The genes coding for sucrose and pectin synthesis were up-regulated under PD stress. The two genes of asparagine synthetase (ZmAS3 and ZmAS4), which are responsible for nitrogen remobilization in leaves, were also significantly induced by the drought treatment. The expression profiles of these genes involved in carbon and nitrogen metabolism suggests their regulatory roles during drought-induced leaf senescence.
Collapse
Affiliation(s)
- Miao Yang
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Mengyao Geng
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Pengfei Shen
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xiaohong Chen
- College of Life Sciences, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yajun Li
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, China.
| | - Xiaoxia Wen
- College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, China.
| |
Collapse
|
28
|
Dehors J, Mareck A, Kiefer-Meyer MC, Menu-Bouaouiche L, Lehner A, Mollet JC. Evolution of Cell Wall Polymers in Tip-Growing Land Plant Gametophytes: Composition, Distribution, Functional Aspects and Their Remodeling. FRONTIERS IN PLANT SCIENCE 2019; 10:441. [PMID: 31057570 PMCID: PMC6482432 DOI: 10.3389/fpls.2019.00441] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 03/22/2019] [Indexed: 05/22/2023]
Abstract
During evolution of land plants, the first colonizing species presented leafy-dominant gametophytes, found in non-vascular plants (bryophytes). Today, bryophytes include liverworts, mosses, and hornworts. In the first seedless vascular plants (lycophytes), the sporophytic stage of life started to be predominant. In the seed producing plants, gymnosperms and angiosperms , the gametophytic stage is restricted to reproduction. In mosses and ferns, the haploid spores germinate and form a protonema, which develops into a leafy gametophyte producing rhizoids for anchorage, water and nutrient uptakes. The basal gymnosperms (cycads and Ginkgo) reproduce by zooidogamy. Their pollen grains develop a multi-branched pollen tube that penetrates the nucellus and releases flagellated sperm cells that swim to the egg cell. The pollen grain of other gymnosperms (conifers and gnetophytes) as well as angiosperms germinates and produces a pollen tube that directly delivers the sperm cells to the ovule (siphonogamy). These different gametophytes, which are short or long-lived structures, share a common tip-growing mode of cell expansion. Tip-growth requires a massive cell wall deposition to promote cell elongation, but also a tight spatial and temporal control of the cell wall remodeling in order to modulate the mechanical properties of the cell wall. The growth rate of these cells is very variable depending on the structure and the species, ranging from very slow (protonemata, rhizoids, and some gymnosperm pollen tubes), to a slow to fast-growth in other gymnosperms and angiosperms. In addition, the structural diversity of the female counterparts in angiosperms (dry, semi-dry vs wet stigmas, short vs long, solid vs hollow styles) will impact the speed and efficiency of sperm delivery. As the evolution and diversity of the cell wall polysaccharides accompanied the diversification of cell wall structural proteins and remodeling enzymes, this review focuses on our current knowledge on the biochemistry, the distribution and remodeling of the main cell wall polymers (including cellulose, hemicelluloses, pectins, callose, arabinogalactan-proteins and extensins), during the tip-expansion of gametophytes from bryophytes, pteridophytes (lycophytes and monilophytes), gymnosperms and the monocot and eudicot angiosperms.
Collapse
|
29
|
Plancot B, Gügi B, Mollet JC, Loutelier-Bourhis C, Ramasandra Govind S, Lerouge P, Follet-Gueye ML, Vicré M, Alfonso C, Nguema-Ona E, Bardor M, Driouich A. Desiccation tolerance in plants: Structural characterization of the cell wall hemicellulosic polysaccharides in three Selaginella species. Carbohydr Polym 2018; 208:180-190. [PMID: 30658789 DOI: 10.1016/j.carbpol.2018.12.051] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 11/16/2018] [Accepted: 12/17/2018] [Indexed: 12/16/2022]
Abstract
Drought-induced dehydration of vegetative tissues in lycopods affects growth and survival. Different species of Selaginella have evolved a series of specialized mechanisms to tolerate desiccation in vegetative tissues in response to water stress. In the present study, we report on the structural characterization of the leaf cell wall of the desiccation-tolerant species S. involvens and two desiccation-sensitive species, namely S. kraussiana and S. moellendorffii. Isolated cell walls from hydrated and desiccated leaves of each species were fractionated and the resulting oligosaccharide fragments were analyzed to determine their structural features. Our results demonstrate that desiccation induces substantial modifications in the cell wall composition and structure. Altogether, these data highlight the fact that structural remodeling of cell wall hemicellulosic polysaccharides including XXXG-rich xyloglucan, arabinoxylan and acetylated galactomannan is an important process in order to mitigate desiccation stress in Selaginella.
Collapse
Affiliation(s)
- Barbara Plancot
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France.
| | - Bruno Gügi
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| | - Jean-Claude Mollet
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| | | | | | - Patrice Lerouge
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| | - Marie-Laure Follet-Gueye
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| | - Maïté Vicré
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| | - Carlos Alfonso
- Normandie Univ, UniRouen, CNRS UMR 6014, COBRA, 76000, Rouen, France
| | - Eric Nguema-Ona
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| | - Muriel Bardor
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France; Institut Universitaire de France, Paris, France
| | - Azeddine Driouich
- Normandie Univ, UniRouen, Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale (Glyco-MEV), 76000, Rouen, France; Fédération de Recherche "Normandie-Végétal"-FED 4277, 76000, Rouen, France
| |
Collapse
|
30
|
Kour S, Zhawar VK. ABA regulation of antioxidant activity during post-germination desiccation and subsequent rehydration in wheat. ACTA BIOLOGICA HUNGARICA 2018; 69:283-299. [PMID: 30257577 DOI: 10.1556/018.68.2018.3.5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
ABA regulation of antioxidant activity during post-germination desiccation and subsequent rehydration was studied in two wheat cultivars PBW 644 (ABA-higher sensitive and drought tolerant) and PBW 343 (ABA-lesser sensitive and drought susceptible) where 1 d-germinated seeds were exposed to ABA/ PEG- 6000 for next 1 d, desiccated for 4 d and subsequently rehydrated for 4 d. Ascorbate, dehydrascorbate to ascorbate ratio, malondialdehyde (MDA), hydroxyl radicals, and activities of monodehydroascorbate reductase (MDHAR), dehydroascorbate reductase (DHAR), alcohol dehydrogenase (AlcDH) and aldehyde dehydrogenase (AldDH) were measured in seedlings just before desiccation (2 d old), desiccated (6 d old) and rehydrated (10 d old) stages. ROS/NO signaling was studied under CT and ABA supply by supplying ROS and NO scavengers. During desiccation, both cultivars showed increase of oxidative stress (dehydroascorbate to ascorbate ratio, MDA, hydroxyl radicals) and antioxidant activity in the form of ascorbate content and AldDH activity while other antioxidant enzymes were not increased. PBW 644 showed higher antioxidant activity thus produced less oxidative stress compared to PBW 343. During rehydration, activities of all antioxidant enzymes and levels of ROS (hydroxyl radicals) were increased in both cultivars and MDA was decreased in PBW 343. ABA supply improved desiccation as well as rehydration by improving all parameters of antioxidant activity tested in this study. PEG supply resembled to ABA-supply for its effects. ABA/PEG improvements were seen higher in PBW 644. ROS/NO-signalling was involved under CT as well as under ABA for increasing antioxidant activity during desiccation as well as rehydration in both cultivars.
Collapse
Affiliation(s)
- Satinder Kour
- Department of Biochemistry, College of Basic Sciences & Humanities, Punjab Agricultural University, Ludhiana, 141004, India
| | - Vikramjit Kaur Zhawar
- Department of Biochemistry, College of Basic Sciences & Humanities, Punjab Agricultural University, Ludhiana, 141004, India
| |
Collapse
|
31
|
Challabathula D, Zhang Q, Bartels D. Protection of photosynthesis in desiccation-tolerant resurrection plants. JOURNAL OF PLANT PHYSIOLOGY 2018; 227:84-92. [PMID: 29778495 DOI: 10.1016/j.jplph.2018.05.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 04/30/2018] [Accepted: 05/01/2018] [Indexed: 05/14/2023]
Abstract
Inhibition of photosynthesis is a central, primary response that is observed in both desiccation-tolerant and desiccation-sensitive plants affected by drought stress. Decreased photosynthesis during drought stress can either be due to the limitation of carbon dioxide entry through the stomata and the mesophyll cells, due to increased oxidative stress or due to decreased activity of photosynthetic enzymes. Although the photosynthetic rates decrease in both desiccation-tolerant and sensitive plants during drought, the remarkable difference lies in the complete recovery of photosynthesis after rehydration in desiccation-tolerant plants. Desiccation of sensitive plants leads to irreparable damages of the photosynthetic membranes, in contrast the photosynthetic apparatus is deactivated during desiccation in desiccation-tolerant plants. Desiccation-tolerant plants employ different strategies to protect and/or maintain the structural integrity of the photosynthetic apparatus to reactivate photosynthesis upon water availability. Two major mechanisms are distinguished. Homoiochlorophyllous desiccation-tolerant plants preserve chlorophyll and thylakoid membranes and require active protection mechanisms, while poikilochlorophyllous plants degrade chlorophyll in a regulated manner but then require de novo synthesis during rehydration. Desiccation-tolerant plants, particularly homoiochlorophyllous plants, employ conserved and novel antioxidant enzymes/metabolites to minimize the oxidative damage and to protect the photosynthetic machinery. De novo synthesized, stress-induced proteins in combination with antioxidants are localized in chloroplasts and are important components of the protective network. Genome sequence informations provide some clues on selection of genes involved in protecting photosynthetic structures; e.g. ELIP genes (early light inducible proteins) are enriched in the genomes and more abundantly expressed in homoiochlorophyllous desiccation-tolerant plants. This review focuses on the mechanisms that operate in the desiccation-tolerant plants to protect the photosynthetic apparatus during desiccation.
Collapse
Affiliation(s)
- Dinakar Challabathula
- Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Kirschallee 1, 53115 Bonn, Germany; Department of Life Sciences, School of Basic and Applied Sciences, Central University of Tamil Nadu, Thiruvarur, India
| | - Qingwei Zhang
- Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Kirschallee 1, 53115 Bonn, Germany
| | - Dorothea Bartels
- Institute of Molecular Physiology and Biotechnology of Plants, University of Bonn, Kirschallee 1, 53115 Bonn, Germany.
| |
Collapse
|
32
|
Neeragunda Shivaraj Y, Barbara P, Gugi B, Vicré-Gibouin M, Driouich A, Ramasandra Govind S, Devaraja A, Kambalagere Y. Perspectives on Structural, Physiological, Cellular, and Molecular Responses to Desiccation in Resurrection Plants. SCIENTIFICA 2018; 2018:9464592. [PMID: 30046509 PMCID: PMC6036803 DOI: 10.1155/2018/9464592] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2017] [Revised: 03/07/2018] [Accepted: 04/26/2018] [Indexed: 05/21/2023]
Abstract
Resurrection plants possess a unique ability to counteract desiccation stress. Desiccation tolerance (DT) is a very complex multigenic and multifactorial process comprising a combination of physiological, morphological, cellular, genomic, transcriptomic, proteomic, and metabolic processes. Modification in the sugar composition of the hemicellulosic fraction of the cell wall is detected during dehydration. An important change is a decrease of glucose in the hemicellulosic fraction during dehydration that can reflect a modification of the xyloglucan structure. The expansins might also be involved in cell wall flexibility during drying and disrupt hydrogen bonds between polymers during rehydration of the cell wall. Cleavages by xyloglucan-modifying enzymes release the tightly bound xyloglucan-cellulose network, thus increasing cell wall flexibility required for cell wall folding upon desiccation. Changes in hydroxyproline-rich glycoproteins (HRGPs) such as arabinogalactan proteins (AGPs) are also observed during desiccation and rehydration processes. It has also been observed that significant alterations in the process of photosynthesis and photosystem (PS) II activity along with changes in the antioxidant enzyme system also increased the cell wall and membrane fluidity resulting in DT. Similarly, recent data show a major role of ABA, LEA proteins, and small regulatory RNA in regulating DT responses. Current progress in "-omic" technologies has enabled quantitative monitoring of the plethora of biological molecules in a high throughput routine, making it possible to compare their levels between desiccation-sensitive and DT species. In this review, we present a comprehensive overview of structural, physiological, cellular, molecular, and global responses involved in desiccation tolerance.
Collapse
Affiliation(s)
- Yathisha Neeragunda Shivaraj
- Centre for Bioinformation, Department of Studies and Research in Environmental Science, Tumkur University, Tumakuru 57210, India
| | - Plancot Barbara
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, Normandie Univ, UniRouen, 76000 Rouen, France
- Fédération de Recherche “Normandie-Végétal”-FED 4277, 76000 Rouen, France
| | - Bruno Gugi
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, Normandie Univ, UniRouen, 76000 Rouen, France
- Fédération de Recherche “Normandie-Végétal”-FED 4277, 76000 Rouen, France
| | - Maïté Vicré-Gibouin
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, Normandie Univ, UniRouen, 76000 Rouen, France
- Fédération de Recherche “Normandie-Végétal”-FED 4277, 76000 Rouen, France
| | - Azeddine Driouich
- Laboratoire de Glycobiologie et Matrice Extracellulaire Végétale, Normandie Univ, UniRouen, 76000 Rouen, France
- Fédération de Recherche “Normandie-Végétal”-FED 4277, 76000 Rouen, France
| | - Sharatchandra Ramasandra Govind
- Centre for Bioinformation, Department of Studies and Research in Environmental Science, Tumkur University, Tumakuru 57210, India
| | - Akash Devaraja
- Centre for Bioinformation, Department of Studies and Research in Environmental Science, Tumkur University, Tumakuru 57210, India
| | - Yogendra Kambalagere
- Department of Studies and Research in Environmental Science, Kuvempu University, Shankaraghatta, Shimoga 577451, India
| |
Collapse
|
33
|
Zhang Q, Bartels D. Molecular responses to dehydration and desiccation in desiccation-tolerant angiosperm plants. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:3211-3222. [PMID: 29385548 DOI: 10.1093/jxb/erx489] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Accepted: 12/20/2017] [Indexed: 05/21/2023]
Abstract
Due to the ability to tolerate extreme dehydration, desiccation-tolerant plants have been widely investigated to find potential approaches for improving water use efficiency or developing new crop varieties. The studies of desiccation-tolerant plants have identified sugar accumulation, specific protein synthesis, cell structure changes, and increased anti-oxidative reactions as part of the mechanisms of desiccation tolerance. However, plants respond differently according to the severity of water loss, and the process of water loss affects desiccation tolerance. A detailed analysis within the dehydration process is important for understanding the process of desiccation tolerance. This review defines dehydration and desiccation, finds the boundary for the relative water content between dehydration and desiccation, compares the molecular responses to dehydration and desiccation, compares signaling differences between dehydration and desiccation, and finally summarizes the strategies launched in desiccation-tolerant plants for dehydration and desiccation, respectively. The roles of abscisic acid (ABA) and reactive oxygen species (ROS) in sensing and signaling during dehydration are discussed. We outline how this knowledge can be exploited to generate drought-tolerant crop plants.
Collapse
Affiliation(s)
- Qingwei Zhang
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Germany
| | - Dorothea Bartels
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Germany
| |
Collapse
|
34
|
Flexibility-Rigidity Coordination of the Dense Exopolysaccharide Matrix in Terrestrial Cyanobacteria Acclimated to Periodic Desiccation. Appl Environ Microbiol 2017; 83:AEM.01619-17. [PMID: 28887420 DOI: 10.1128/aem.01619-17] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 08/29/2017] [Indexed: 11/20/2022] Open
Abstract
A dense exopolysaccharide (EPS) matrix is crucial for cyanobacterial survival in terrestrial xeric environments, in which cyanobacteria undergo frequent expansion and shrinkage processes during environmental desiccation-rehydration cycles. However, it is unclear how terrestrial cyanobacteria coordinate the structural dynamics of the EPS matrix upon expansion and shrinkage to avoid potential mechanical stress while benefiting from the matrix. In the present study, we sought to answer this question by investigating the gene expression, protein dynamics, enzymatic characteristics, and biological roles of WspA, an abundantly secreted protein, in the representative terrestrial cyanobacterium Nostoc flagelliforme The results demonstrated that WspA is a novel β-galactosidase that facilitates softening of the EPS matrix by breaking the polysaccharide backbone under substantial moisture or facilitates the thickening and relinkage of the broken matrix during the drying process, and thus these regulations are well correlated with moisture availability or desiccation-rehydration cycles. This coordination of flexibility and rigidity of the cyanobacterial extracellular matrix may contribute to a favorable balance of cell growth and stress resistance in xeric environments.IMPORTANCE How the exopolysaccharide matrix is dynamically coordinated by exoproteins to cope with frequent expansion and shrinkage processes in terrestrial colonial cyanobacteria remains unclear. Here we elucidated the biochemical identity and biological roles of a dominant exoprotein in these regulation processes. Our study thus gained insight into this regulative mechanism in cyanobacteria to combat periodic desiccation. In addition, the filamentous drought-adapted cyanobacterium Nostoc flagelliforme serves as an ideal model for us to explore this issue in this study.
Collapse
|
35
|
Aidar SDT, Chaves ARDM, Fernandes Júnior PI, Oliveira MDS, Costa Neto BPD, Calsa Junior T, Morgante CV. Vegetative desiccation tolerance of Tripogon spicatus (Poaceae) from the tropical semiarid region of northeastern Brazil. FUNCTIONAL PLANT BIOLOGY : FPB 2017; 44:1124-1133. [PMID: 32480638 DOI: 10.1071/fp17066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Accepted: 07/14/2017] [Indexed: 06/11/2023]
Abstract
The vegetative desiccation tolerance of Tripogon spicatus (Nees) Ekman was confirmed by its ability to recover the physiological functionality of intact plants previously subjected to extreme dehydration. Photosynthesis became undetectable when leaf relative water content (RWCleaf) achieved ~60%, whereas photochemical variables showed a partial decrease. Until the minimum RWCleaf of 6.41%, total chl decreased by 9%, and total carotenoids increased by 29%. Superoxide dismutase (SOD) activity decreased by 57%, on average, during dehydration, but catalase (CAT) and peroxidase (APX) activities showed no significant differences throughout the experiment. Malondialdehyde (MDA) content increased by 151%, total leaf and root amino acids decreased by 62% and 77%, respectively, whereas leaf and root proline decreased by 40% and 61%, respectively, until complete desiccation. After rehydration, leaves completely recovered turgidity and total chl contents. Carotenoids and MDA remained high, whereas SOD was 60% lower than the measured average measured before dehydration. With the exception of root amino acid contents, total amino acids and proline concentrations recovered completely. Gas exchange and photochemical variables remained substantially higher 4 days after rehydration, compared with the control. Besides increasing MDA, the overall physiological results showed that membrane functionality was preserved, leading to the vegetative desiccation tolerance of T. spicatus during the dehydration-rehydration cycle.
Collapse
Affiliation(s)
- Saulo de T Aidar
- Empresa Brasileira de Pesquisa Agropecuária Embrapa Semiárido, Rodovia BR 428, km 152, PO Box 23, Petrolina, Pernambuco, Brazil
| | - Agnaldo R de M Chaves
- Empresa Brasileira de Pesquisa Agropecuária Embrapa Semiárido, Rodovia BR 428, km 152, PO Box 23, Petrolina, Pernambuco, Brazil
| | - Paulo I Fernandes Júnior
- Empresa Brasileira de Pesquisa Agropecuária Embrapa Semiárido, Rodovia BR 428, km 152, PO Box 23, Petrolina, Pernambuco, Brazil
| | - Melquisedec de S Oliveira
- Universidade Federal de Pernambuco (UFPE), Departamento de Genética, Avenida Professor Moraes Rego, 1235, Cidade Universitária, CEP 50670420, Recife, Pernambuco, Brazil
| | - Benjamim P da Costa Neto
- Universidade de Pernambuco (UPE), Rodovia BR 203, Km 2, sem número, CEP 56328903, Petrolina, Pernambuco, Brazil
| | - Tercílio Calsa Junior
- Universidade Federal de Pernambuco (UFPE), Departamento de Genética, Avenida Professor Moraes Rego, 1235, Cidade Universitária, CEP 50670420, Recife, Pernambuco, Brazil
| | - Carolina V Morgante
- Empresa Brasileira de Pesquisa Agropecuária Embrapa Semiárido, Rodovia BR 428, km 152, PO Box 23, Petrolina, Pernambuco, Brazil
| |
Collapse
|
36
|
Changes in Seed Germination Ability, Lipid Peroxidation and Antioxidant Enzyme Activities of Ginkgo biloba Seed during Desiccation. FORESTS 2017. [DOI: 10.3390/f8080286] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
37
|
Fierro C, López-Cristoffanini C, Meynard A, Lovazzano C, Castañeda F, Guajardo E, Contreras-Porcia L. Expression profile of desiccation tolerance factors in intertidal seaweed species during the tidal cycle. PLANTA 2017; 245:1149-1164. [PMID: 28289905 DOI: 10.1007/s00425-017-2673-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 03/02/2017] [Indexed: 05/26/2023]
Abstract
The transcriptional modulation of desiccation tolerance factors in P. orbicularis explains its successful recuperation after water deficit. Differential responses to air exposure clarify seaweed distribution along intertidal rocky zones. Desiccation-tolerant seaweed species, such as Pyropia orbicularis, can tolerate near 96% water loss during air exposure. To understand the phenotypic plasticity of P. orbicularis to desiccation, several tolerance factors were assessed by RT-qPCR, Western-blot analysis, and enzymatic assays during the natural desiccation-rehydration cycle. Comparative enzymatic analyses were used to evidence differential responses between P. orbicularis and desiccation-sensitive species. The results showed that during desiccation, the relative mRNA levels of genes associated with basal metabolism [trehalose phosphate synthase (tps) and pyruvate dehydrogenase (pdh)] were overexpressed in P. orbicularis. Transcript levels related to antioxidant metabolism [peroxiredoxin (prx); thioredoxin (trx); catalase (cat); lipoxygenase (lox); ferredoxin (fnr); glutathione S-transferase (gst)], cellular detoxification [ABC transporter (abc) and ubiquitin (ubq)], and signal transduction [calmodulin (cam)] increased approximately 15- to 20-fold, with the majority returning to basal levels during the final hours of rehydration. In contrast, actin (act) and transcription factor 1 (tf1) transcripts were down-regulated. ABC transporter protein levels increased in P. orbicularis during desiccation, whereas PRX transcripts decreased. The antioxidant enzymes showed higher specific activity in P. orbicularis under desiccation, and sensitive species exhibited enzymatic inactivation and scarce ABC and PRX protein detection following prolonged desiccation. In conclusion, the reported findings contribute towards understanding the ecological distribution of intertidal seaweeds at the molecular and functional levels.
Collapse
Affiliation(s)
- Camila Fierro
- Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 440, Santiago, Chile
| | - Camilo López-Cristoffanini
- Departamento de Biología Evolutiva, Ecología y Ciencias Ambientales, Facultad de Biología, Universidad de Barcelona, Diagonal 643, 08028, Barcelona, Spain
| | - Andrés Meynard
- Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 440, Santiago, Chile
| | - Carlos Lovazzano
- Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 440, Santiago, Chile
| | - Francisco Castañeda
- Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 440, Santiago, Chile
| | - Eduardo Guajardo
- Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 440, Santiago, Chile
| | - Loretto Contreras-Porcia
- Departamento de Ecología y Biodiversidad, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 440, Santiago, Chile.
- Center of Applied Ecology and Sustainability (CAPES), Pontificia Universidad Católica de Chile, Avda. Bernardo O'Higgins 340, Santiago, Chile.
| |
Collapse
|
38
|
Guo YM, Samans B, Chen S, Kibret KB, Hatzig S, Turner NC, Nelson MN, Cowling WA, Snowdon RJ. Drought-Tolerant Brassica rapa Shows Rapid Expression of Gene Networks for General Stress Responses and Programmed Cell Death Under Simulated Drought Stress. PLANT MOLECULAR BIOLOGY REPORTER 2017; 35:416-430. [PMID: 28751801 PMCID: PMC5504209 DOI: 10.1007/s11105-017-1032-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Production of oilseed rape/canola (Brassica napus) is increasingly threatened by dry conditions while the demand for vegetable oil is increasing. Brassica rapa is a genetically diverse ancestor of B. napus, and is readily crossed with B. napus. Recently, we reported promising levels of drought tolerance in a wild type of B. rapa which could be a source of drought tolerance for B. napus. We analysed global gene expression by messenger RNA sequencing in seedlings of the drought-tolerant and a drought-sensitive genotype of B. rapa under simulated drought stress and control conditions. A subset of stress-response genes were validated by reverse transcription quantitative PCR. Gene ontology enrichment analysis and pathway enrichment analysis revealed major differences between the two genotypes in the mode and onset of stress responses in the first 12 h of treatment. Drought-tolerant plants reacted uniquely and rapidly by upregulating genes associated with jasmonic acid and salicylic acid metabolism, as well as genes known to cause endoplasmic reticulum stress and induction of programmed cell death. Conversely, active responses in drought-sensitive plants were delayed until 8 or 12 h after stress application. The results may help to identify biomarkers for selection of breeding materials with potentially improved drought tolerance.
Collapse
Affiliation(s)
- Yi Ming Guo
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, 6009 Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, 6009 Australia
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, China
| | - Birgit Samans
- Department of Plant Breeding, Justus Liebig University, 35392 Giessen, Germany
| | - Sheng Chen
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, 6009 Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, 6009 Australia
| | - Kidist B. Kibret
- Department of Plant Breeding, Justus Liebig University, 35392 Giessen, Germany
| | - Sarah Hatzig
- Department of Plant Breeding, Justus Liebig University, 35392 Giessen, Germany
| | - Neil C. Turner
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, 6009 Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, 6009 Australia
- Centre for Plant Genetics and Breeding, The University of Western Australia, Perth, 6009 Australia
| | - Matthew N. Nelson
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, 6009 Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, 6009 Australia
- Natural Capital and Plant Health, Royal Botanic Gardens Kew, Wakehurst Place, Ardingly, West Sussex RH17 6TN UK
| | - Wallace A. Cowling
- UWA School of Agriculture and Environment, The University of Western Australia, Perth, 6009 Australia
- The UWA Institute of Agriculture, The University of Western Australia, Perth, 6009 Australia
| | - Rod J. Snowdon
- Department of Plant Breeding, Justus Liebig University, 35392 Giessen, Germany
| |
Collapse
|
39
|
Lang S, Liu X, Xue H, Li X, Wang X. Functional characterization of BnHSFA4a as a heat shock transcription factor in controlling the re-establishment of desiccation tolerance in seeds. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:2361-2375. [PMID: 28369570 DOI: 10.1093/jxb/erx097] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Desiccation tolerance (DT) is the crucial ability of seeds to resist desiccation. However, the regulatory mechanisms of seed DT are not fully understood. In this study, two heat shock cis-elements (HSEs) were identified in the Brassica napus galactinol synthase (BnGolS1) promoter and shown to bind the heat shock transcription factor A4a (BnHSFA4a). Transcriptional expression of BnHSFA4a was induced at the early stage of DT acquisition, prior to increased BnGolS1 activity and galactinol production. Ectopic overexpression of BnHSFA4a (oxBnHSFA4a) in Arabidopsis enhanced DT, particularly during DT re-establishment. OxBnHSFA4a up-regulated the expression of GolS1, GolS2, and raffinose synthase 2 (BnRS2) in Arabidopsis and increased the enzymatic activity of GolS and RS and the concentration of raffinose family oligosaccharides (RFOs). Additionally, the overexpression lines exhibited increased antioxidant abilities. In contrast, the Arabidopsis mutant athsfa4a was more sensitive to dehydration, showing decreases in the efficiency of DT re-establishment, RFO contents, and oxidation resistance. Complementation analysis indicated that DT was rescued in athsfa4a/BnHSFA4a seeds to similar levels compared with those of Col-0. Taken together, these results indicated that BnHSFA4a probably functions in the regulation of GolS expression and activity, and activation of the antioxidative system and other stress response factors to improve DT.
Collapse
Affiliation(s)
- Sirui Lang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Tsinghua East Road 35, Haidian District, Beijing 100083, PR China
| | - Xiaoxia Liu
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Tsinghua East Road 35, Haidian District, Beijing 100083, PR China
| | - Hua Xue
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Tsinghua East Road 35, Haidian District, Beijing 100083, PR China
| | - Xu Li
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Tsinghua East Road 35, Haidian District, Beijing 100083, PR China
| | - Xiaofeng Wang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Tsinghua East Road 35, Haidian District, Beijing 100083, PR China
| |
Collapse
|
40
|
Zhang Q, Song X, Bartels D. Enzymes and Metabolites in Carbohydrate Metabolism of Desiccation Tolerant Plants. Proteomes 2016; 4:E40. [PMID: 28248249 PMCID: PMC5260972 DOI: 10.3390/proteomes4040040] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Revised: 12/01/2016] [Accepted: 12/07/2016] [Indexed: 01/31/2023] Open
Abstract
Resurrection plants can tolerate extreme water loss. Substantial sugar accumulation is a phenomenon in resurrection plants during dehydration. Sugars have been identified as one important factor contributing to desiccation tolerance. Phylogenetic diversity of resurrection plants reflects the diversity of sugar metabolism in response to dehydration. Sugars, which accumulate during dehydration, have been shown to protect macromolecules and membranes and to scavenge reactive oxygen species. This review focuses on the performance of enzymes participating in sugar metabolism during dehydration stress. The relation between sugar metabolism and other biochemical activities is discussed and open questions as well as potential experimental approaches are proposed.
Collapse
Affiliation(s)
- Qingwei Zhang
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Kirschallee 1, 53115 Bonn, Germany.
| | - Xiaomin Song
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Kirschallee 1, 53115 Bonn, Germany.
| | - Dorothea Bartels
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Kirschallee 1, 53115 Bonn, Germany.
| |
Collapse
|
41
|
Zia A, Walker BJ, Oung HMO, Charuvi D, Jahns P, Cousins AB, Farrant JM, Reich Z, Kirchhoff H. Protection of the photosynthetic apparatus against dehydration stress in the resurrection plant Craterostigma pumilum. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2016; 87:664-80. [PMID: 27258321 DOI: 10.1111/tpj.13227] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 05/18/2016] [Accepted: 05/24/2016] [Indexed: 05/20/2023]
Abstract
The group of homoiochlorophyllous resurrection plants evolved the unique capability to survive severe drought stress without dismantling the photosynthetic machinery. This implies that they developed efficient strategies to protect the leaves from reactive oxygen species (ROS) generated by photosynthetic side reactions. These strategies, however, are poorly understood. Here, we performed a detailed study of the photosynthetic machinery in the homoiochlorophyllous resurrection plant Craterostigma pumilum during dehydration and upon recovery from desiccation. During dehydration and rehydration, C. pumilum deactivates and activates partial components of the photosynthetic machinery in a specific order, allowing for coordinated shutdown and subsequent reinstatement of photosynthesis. Early responses to dehydration are the closure of stomata and activation of electron transfer to oxygen accompanied by inactivation of the cytochrome b6 f complex leading to attenuation of the photosynthetic linear electron flux (LEF). The decline in LEF is paralleled by a gradual increase in cyclic electron transport to maintain ATP production. At low water contents, inactivation and supramolecular reorganization of photosystem II becomes apparent, accompanied by functional detachment of light-harvesting complexes and interrupted access to plastoquinone. This well-ordered sequence of alterations in the photosynthetic thylakoid membranes helps prepare the plant for the desiccated state and minimize ROS production.
Collapse
Affiliation(s)
- Ahmad Zia
- Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164-6340, USA
| | - Berkley J Walker
- School of Biological Sciences, Molecular Plant Sciences, Washington State University, Pullman, WA, 99164-4236, USA
| | - Hui Min Olivia Oung
- Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164-6340, USA
| | - Dana Charuvi
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Peter Jahns
- Plant Biochemistry, Heinrich-Heine University Düsseldorf, Düsseldorf 40225, Germany
| | - Asaph B Cousins
- School of Biological Sciences, Molecular Plant Sciences, Washington State University, Pullman, WA, 99164-4236, USA
| | - Jill M Farrant
- Department of Molecular and Cell Biology, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa
| | - Ziv Reich
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Helmut Kirchhoff
- Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164-6340, USA.
| |
Collapse
|
42
|
Zhang Q, Bartels D. Physiological factors determine the accumulation of D-glycero-D-ido-octulose (D-g-D-i-oct) in the desiccation tolerant resurrection plant Craterostigma plantagineum. FUNCTIONAL PLANT BIOLOGY : FPB 2016; 43:684-694. [PMID: 32480496 DOI: 10.1071/fp15278] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 01/24/2016] [Indexed: 06/11/2023]
Abstract
The relationship between the accumulation of D-glycero-D-ido-octulose (D-g-D-i-oct) and sucrose and desiccation tolerance was analysed in leaves of Craterostigma plantagineum Hochst. in various conditions. The D-g-D-i-oct level is strictly controlled in C. plantagienum. Light is an important factor enhancing D-g-D-i-oct synthesis when exogenous sucrose is supplied. Desiccation tolerance is lost during natural senescence and during sugar starvation that leads to senescence. The differences in expression patterns of senescence-related genes and the carbohydrate status between vigorous and senescent plants indicate that desiccation tolerance and accumulation of octulose in C. plantagineum is dependent on the developmental stage. Sucrose synthesis is affected more by dehydration than by senescence. D-g-D-i-oct has superior hydroxyl scavenging ability to other common sugars accumulating in C. plantagineum. In the presence of reactive oxygen species (ROS) D-g-D-i-oct levels decreased, probably as a defence reaction.
Collapse
Affiliation(s)
- Qingwei Zhang
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Kirschallee 1, 53115 Bonn, Germany
| | - Dorothea Bartels
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Kirschallee 1, 53115 Bonn, Germany
| |
Collapse
|
43
|
Centeno DC, Hell AF, Braga MR, Del Campo EM, Casano LM. Contrasting strategies used by lichen microalgae to cope with desiccation-rehydration stress revealed by metabolite profiling and cell wall analysis. Environ Microbiol 2016; 18:1546-60. [PMID: 26914009 DOI: 10.1111/1462-2920.13249] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 01/21/2016] [Accepted: 01/21/2016] [Indexed: 01/07/2023]
Abstract
Most lichens in general, and their phycobionts in particular, are desiccation tolerant, but their mechanisms of desiccation tolerance (DT) remain obscure. The physiological responses and cell wall features of two putatively contrasting lichen-forming microalgae, Trebouxia sp. TR9 (TR9), isolated from Ramalina farinacea (adapted to frequent desiccation-rehydration cycles), and Coccomyxa solorina-saccatae (Csol), obtained from Solorina saccata (growing in usually humid limestone crevices, subjected to seasonal dry periods) was characterized. Microalgal cultures were desiccated under 25%-30% RH and then rehydrated. Under these conditions, RWC and ψw decreased faster and simultaneously during dehydration in Csol, whereas TR9 maintained its ψw until 70% RWC. The metabolic profile indicated that polyols played a key role in DT of both microalgae. However, TR9 constitutively accumulated higher amounts of polyols, whereas Csol induced the polyol synthesis under desiccation-rehydration. Csol also accumulated ascorbic acid, while TR9 synthesized protective raffinose-family oligosaccharides (RFOs) and increased its content of phenolics. Additionally, TR9 exhibited thicker and qualitatively different cell wall and extracellular polymeric layer compared with Csol, indicating higher water retention capability. The findings were consistent with the notion that lichen microalgae would have evolved distinct strategies to cope with desiccation-rehydration stress in correspondence with the water regime of their respective habitats.
Collapse
Affiliation(s)
- Danilo C Centeno
- Centre of Natural Sciences and Humanities, Federal University of ABC, 09606-070, São Bernardo do Campo, SP, Brazil.,Department of Plant Physiology and Biochemistry, Institute of Botany, 04301-912, São Paulo, SP, Brazil
| | - Aline F Hell
- Department of Plant Physiology and Biochemistry, Institute of Botany, 04301-912, São Paulo, SP, Brazil
| | - Marcia R Braga
- Department of Plant Physiology and Biochemistry, Institute of Botany, 04301-912, São Paulo, SP, Brazil
| | - Eva M Del Campo
- Department of Life Sciences, University of Alcalá, 28805-, Alcalá de Henares (Madrid), Spain
| | - Leonardo M Casano
- Department of Life Sciences, University of Alcalá, 28805-, Alcalá de Henares (Madrid), Spain
| |
Collapse
|
44
|
Tripathi P, Rabara RC, Reese RN, Miller MA, Rohila JS, Subramanian S, Shen QJ, Morandi D, Bücking H, Shulaev V, Rushton PJ. A toolbox of genes, proteins, metabolites and promoters for improving drought tolerance in soybean includes the metabolite coumestrol and stomatal development genes. BMC Genomics 2016; 17:102. [PMID: 26861168 PMCID: PMC4746818 DOI: 10.1186/s12864-016-2420-0] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Accepted: 01/26/2016] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND The purpose of this project was to identify metabolites, proteins, genes, and promoters associated with water stress responses in soybean. A number of these may serve as new targets for the biotechnological improvement of drought responses in soybean (Glycine max). RESULTS We identified metabolites, proteins, and genes that are strongly up or down regulated during rapid water stress following removal from a hydroponics system. 163 metabolites showed significant changes during water stress in roots and 93 in leaves. The largest change was a root-specific 160-fold increase in the coumestan coumestrol making it a potential biomarker for drought and a promising target for improving drought responses. Previous reports suggest that coumestrol stimulates mycorrhizal colonization and under certain conditions mycorrhizal plants have improved drought tolerance. This suggests that coumestrol may be part of a call for help to the rhizobiome during stress. About 3,000 genes were strongly up-regulated by drought and we identified regulators such as ERF, MYB, NAC, bHLH, and WRKY transcription factors, receptor-like kinases, and calcium signaling components as potential targets for soybean improvement as well as the jasmonate and abscisic acid biosynthetic genes JMT, LOX1, and ABA1. Drought stressed soybean leaves show reduced mRNA levels of stomatal development genes including FAMA-like, MUTE-like and SPEECHLESS-like bHLH transcription factors and leaves formed after drought stress had a reduction in stomatal density of 22.34 % and stomatal index of 17.56 %. This suggests that reducing stomatal density may improve drought tolerance. MEME analyses suggest that ABRE (CACGT/CG), CRT/DRE (CCGAC) and a novel GTGCnTGC/G element play roles in transcriptional activation and these could form components of synthetic promoters to drive expression of transgenes. Using transformed hairy roots, we validated the increase in promoter activity of GmWRKY17 and GmWRKY67 during dehydration and after 20 μM ABA treatment. CONCLUSIONS Our toolbox provides new targets and strategies for improving soybean drought tolerance and includes the coumestan coumestrol, transcription factors that regulate stomatal density, water stress-responsive WRKY gene promoters and a novel DNA element that appears to be enriched in water stress responsive promoters.
Collapse
Affiliation(s)
- Prateek Tripathi
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD57007, USA.
- Current address, Molecular and Computational Biology, Dana & David Dornsife College of Letters, Arts and Sciences, University of Southern California, Los Angeles, CA, 90089, USA.
| | - Roel C Rabara
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD57007, USA.
- Current address: Texas A&M AgriLife Research and Extension Center, Dallas, TX, 75252, USA.
| | - R Neil Reese
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD57007, USA.
| | - Marissa A Miller
- Texas A&M AgriLife Research and Extension Center, Dallas, TX, 75252, USA.
| | - Jai S Rohila
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD57007, USA.
| | - Senthil Subramanian
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD57007, USA.
| | - Qingxi J Shen
- School of Life Sciences, University of Nevada, Las Vegas, 89154, USA.
| | - Dominique Morandi
- INRA, UMR 1347 Agroécologie, 17 rue Sully, BP 86510, 21065, Dijon, CEDEX, France.
| | - Heike Bücking
- Department of Biology and Microbiology, South Dakota State University, Brookings, SD57007, USA.
| | - Vladimir Shulaev
- Department of Biological Sciences, University of North Texas, Denton, TX, 76203, USA.
| | - Paul J Rushton
- Texas A&M AgriLife Research and Extension Center, Dallas, TX, 75252, USA.
- Current address, 22nd Century Group Inc., 9530 Main Street Clarence, New York, 14031, USA.
| |
Collapse
|
45
|
Tian X, Li S, Liu Y, Liu X. Transcriptomic Profiling Reveals Metabolic and Regulatory Pathways in the Desiccation Tolerance of Mungbean ( Vigna radiata [L.] R. Wilczek). FRONTIERS IN PLANT SCIENCE 2016; 7:1921. [PMID: 28066476 PMCID: PMC5174128 DOI: 10.3389/fpls.2016.01921] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 12/05/2016] [Indexed: 05/20/2023]
Abstract
Mungbean (Vigna radiate L. Wilczek) is an important legume crop for its valuable nutritional and health benefits. Desiccation tolerance (DT) is a capacity of seeds to survive and maintain physiological activities during storage and under stress conditions. Many studies of DT have been reported in other legume crop, such as soybean and Medicago truncatula with little studies in the mungbean. In this study, the transcript profiles of mungbean seeds under different imbibition times were investigated for DT using RNA-sequencing (RNA-seq). A total of 3210 differentially expressed genes (DEGs) were found at the key period of DT (3-18 h of imbibition). Gene ontology (GO) and KEGG analysis showed that the terms of "response to stimulus," "transcription regulator," "methylation," and "starch and sucrose metabolism" were enriched for DT. Clustering analysis also showed that many transcription factors (MYB, AP2, and NAC), HSPs, embryogenesis abundant (LEA) proteins, and genes encoding methyltransferase and histone were differentially expressed. Nine of these DEGs were further validated by quantitative RT-PCR (qRT-PCR). Our study extends our knowledge of mungbean transcriptomes and further provides insight into the molecular mechanism of DT as well as new strategies for developing drought-tolerant crops.
Collapse
Affiliation(s)
- Xiangrong Tian
- College of Biology, Hunan UniversityChangsha, China
- Key Laboratory of Plant Resource Conservation and Utilization of Hunan Province, Jishou UniversityJishou, China
- *Correspondence: Xiangrong Tian
| | - Sidi Li
- Key Laboratory of Plant Resource Conservation and Utilization of Hunan Province, Jishou UniversityJishou, China
| | - Yisong Liu
- Center of Analytical Service, Hunan Agricultural UniversityChangsha, China
| | - Xuanming Liu
- College of Biology, Hunan UniversityChangsha, China
- Xuanming Liu
| |
Collapse
|
46
|
Tripathi P, Rabara RC, Shulaev V, Shen QJ, Rushton PJ. Understanding Water-Stress Responses in Soybean Using Hydroponics System-A Systems Biology Perspective. FRONTIERS IN PLANT SCIENCE 2015; 6:1145. [PMID: 26734044 PMCID: PMC4685135 DOI: 10.3389/fpls.2015.01145] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Accepted: 12/02/2015] [Indexed: 05/26/2023]
Abstract
The deleterious changes in environmental conditions such as water stress bring physiological and biochemical changes in plants, which results in crop loss. Thus, combating water stress is important for crop improvement to manage the needs of growing population. Utilization of hydroponics system in growing plants is questionable to some researchers, as it does not represent an actual field condition. However, trying to address a complex problem like water stress we have to utilize a simpler growing condition like the hydroponics system wherein every input given to the plants can be controlled. With the advent of high-throughput technologies, it is still challenging to address all levels of the genetic machinery whether a gene, protein, metabolite, and promoter. Thus, using a system of reduced complexity like hydroponics can certainly direct us toward the right candidates, if not completely help us to resolve the issue.
Collapse
Affiliation(s)
- Prateek Tripathi
- Department of Biology and Microbiology, South Dakota State University Brookings, SD, USA
| | - Roel C Rabara
- Department of Biology and Microbiology, South Dakota State University Brookings, SD, USA
| | - Vladimir Shulaev
- Department of Biological Sciences, University of North Texas Denton, TX, USA
| | - Qingxi J Shen
- School of Life Sciences, University of Nevada Las Vegas Las Vegas, NV, USA
| | - Paul J Rushton
- Texas A&M AgriLife Research & Extension Center Dallas, TX, USA
| |
Collapse
|
47
|
Moon SJ, Han SY, Kim DY, Yoon IS, Shin D, Byun MO, Kwon HB, Kim BG. Ectopic expression of a hot pepper bZIP-like transcription factor in potato enhances drought tolerance without decreasing tuber yield. PLANT MOLECULAR BIOLOGY 2015; 89:421-31. [PMID: 26394867 DOI: 10.1007/s11103-015-0378-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2015] [Accepted: 09/10/2015] [Indexed: 05/23/2023]
Abstract
Over-expression of group A bZIP transcription factor genes in plants improves abiotic stress tolerance but usually reduces yields. Thus, there have been several efforts to overcome yield penalty in transgenic plants. In this study, we characterized that expression of the hot pepper (Capsicum annuum) gene CaBZ1, which encodes a group S bZIP transcription factor, was induced by salt and osmotic stress as well as abscisic acid (ABA). Transgenic potato (Solanum tuberosum) plants over-expressing CaBZ1 exhibited reduced rates of water loss and faster stomatal closure than non transgenic potato plants under drought and ABA treatment conditions. CaBZ1 over-expression in transgenic potato increased the expression of ABA- and stress-related genes (such as CYP707A1, CBF and NAC-like genes) and improved drought stress tolerance. Interestingly, over-expression of CaBZ1 in potato did not produce undesirable growth phenotypes in major agricultural traits such as plant height, leaf size and tuber formation under normal growth conditions. The transgenic potato plants also had higher tuber yields than non transgenic potato plants under drought stress conditions. Thus, CaBZ1 may be useful for improving drought tolerance in tuber crops. This might be the first report of the production of transgenic potato with improved tuber yields under drought conditions.
Collapse
Affiliation(s)
- Seok-Jun Moon
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Se-Youn Han
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Dool-Yi Kim
- Crop Foundation Research Division, National Institute of Crop Science, RDA, Wanju-gun, Jeollabuk-do, 565-851, Republic of Korea
| | - In Sun Yoon
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Dongjin Shin
- Paddy Crop Research Division, Department of Southern Area, National Institute of Crop Science, RDA, Miryang, 627-803, Republic of Korea
| | - Myung-Ok Byun
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea
| | - Hawk-Bin Kwon
- Department of Biomedical Sciences, Sunmoon University, Asan, 336-708, Republic of Korea
| | - Beom-Gi Kim
- Molecular Breeding Division, Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA, Jeonju, 560-500, Republic of Korea.
| |
Collapse
|
48
|
Moore JP, Farrant JM. Editorial: Current advances and challenges in understanding plant desiccation tolerance. FRONTIERS IN PLANT SCIENCE 2015; 6:768. [PMID: 26483800 PMCID: PMC4586587 DOI: 10.3389/fpls.2015.00768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 09/07/2015] [Indexed: 05/28/2023]
Affiliation(s)
- John P. Moore
- Department of Viticulture and Oenology, Faculty of AgriSciences, Institute for Wine Biotechnology, Stellenbosch UniversityStellenbosch, South Africa
| | - Jill M. Farrant
- Department of Molecular and Cell Biology, University of Cape TownCape Town, South Africa
| |
Collapse
|
49
|
Giarola V, Bartels D. What can we learn from the transcriptome of the resurrection plant Craterostigma plantagineum? PLANTA 2015; 242:427-34. [PMID: 26002527 DOI: 10.1007/s00425-015-2327-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 05/02/2015] [Indexed: 05/21/2023]
Abstract
The desiccation transcriptome of the resurrection plant C. plantagineum is composed of conserved protein coding transcripts, taxonomically restricted transcripts and recently evolved non-protein coding transcripts. Research in resurrection plants has been hampered by the lack of genome sequence information, but recently introduced sequencing technologies overcome this limitation partially and provide access to the transcriptome of these plants. Transcriptome studies showed that mechanisms involved in desiccation tolerance are conserved in resurrection plants, seeds and pollen. The accumulation of protective molecules such as sugars and LEA proteins are major components in desiccation tolerance. Leaf folding, chloroplast protection and protection during rehydration must involve specific molecular mechanisms, but the basis of such mechanisms is mainly unknown. The study of regulatory regions of a desiccation-induced C. plantagineum gene suggests that cis-regulatory elements may be responsible for expression variations in desiccation tolerant and non-desiccation-tolerant plants. The analysis of the C. plantagineum transcriptome also revealed that part of it is composed of taxonomically restricted genes (TRGs) and non-protein coding RNAs (ncRNAs). TRGs are known to code for new traits required for the adaptation of organisms to particular environmental conditions. Thus the study of TRGs from resurrection plants should reveal species-specific functions related to the desiccation tolerance phenotype. Non-protein coding RNAs can regulate gene expression at epigenetic, transcriptional and post-transcriptional level and thus these RNAs may be key players in the rewiring of regulatory networks of desiccation-related genes in C. plantagineum.
Collapse
Affiliation(s)
- Valentino Giarola
- Institute of Molecular Physiology and Biotechnology of Plants (IMBIO), University of Bonn, Kirschallee 1, 53115, Bonn, Germany
| | | |
Collapse
|
50
|
Farrant JM, Cooper K, Hilgart A, Abdalla KO, Bentley J, Thomson JA, Dace HJW, Peton N, Mundree SG, Rafudeen MS. A molecular physiological review of vegetative desiccation tolerance in the resurrection plant Xerophyta viscosa (Baker). PLANTA 2015; 242:407-26. [PMID: 25998524 PMCID: PMC4498234 DOI: 10.1007/s00425-015-2320-6] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Accepted: 05/05/2015] [Indexed: 05/18/2023]
Abstract
MAIN CONCLUSION Provides a first comprehensive review of integrated physiological and molecular aspects of desiccation tolerance Xerophyta viscosa. A synopsis of biotechnological studies being undertaken to improve drought tolerance in maize is given. Xerophyta viscosa (Baker) is a monocotyledonous resurrection plant from the family Vellociacea that occurs in summer-rainfall areas of South Africa, Lesotho and Swaziland. It inhabits rocky terrain in exposed grasslands and frequently experiences periods of water deficit. Being a resurrection plant it tolerates the loss of 95% of total cellular water, regaining full metabolic competency within 3 days of rehydration. In this paper, we review some of the molecular and physiological adaptations that occur during various stages of dehydration of X. viscosa, these being functionally grouped into early and late responses, which might be relevant to the attainment of desiccation tolerance. During early drying (to 55% RWC) photosynthesis is shut down, there is increased presence and activity of housekeeping antioxidants and a redirection of metabolism to the increased formation of sucrose and raffinose family oligosaccharides. Other metabolic shifts suggest water replacement in vacuoles proposed to facilitate mechanical stabilization. Some regulatory processes observed include increased presence of a linker histone H1 variant, a Type 2C protein phosphatase, a calmodulin- and an ERD15-like protein. During the late stages of drying (to 10% RWC) there was increased expression of several proteins involved in signal transduction, and retroelements speculated to be instrumental in gene silencing. There was induction of antioxidants not typically found in desiccation-sensitive systems, classical stress-associated proteins (HSP and LEAs), proteins involved in structural stabilization and those associated with changes in various metabolite pools during drying. Metabolites accumulated in this stage are proposed, inter alia, to facilitate subcellular stabilization by vitrification process which can include glass- and ionic liquid formation.
Collapse
Affiliation(s)
- Jill M Farrant
- Department of Molecular and Cell Biology, University of Cape Town, Private Bag X3, Rondebosch, 7701, South Africa,
| | | | | | | | | | | | | | | | | | | |
Collapse
|