1
|
Abhijith Shankar PS, Parida P, Bhardwaj R, Yadav A, Swapnil P, Seth CS, Meena M. Deciphering molecular regulation of reactive oxygen species (ROS) and reactive nitrogen species (RNS) signalling networks in Oryza genus amid environmental stress. PLANT CELL REPORTS 2024; 43:185. [PMID: 38951279 DOI: 10.1007/s00299-024-03264-1] [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: 03/29/2024] [Accepted: 06/10/2024] [Indexed: 07/03/2024]
Abstract
The Oryza genus, containing Oryza sativa L., is quintessential to sustain global food security. This genus has a lot of sophisticated molecular mechanisms to cope with environmental stress, particularly during vulnerable stages like flowering. Recent studies have found key involvements and genetic modifications that increase resilience to stress, including exogenous application of melatonin, allantoin, and trehalose as well as OsSAPK3 and OsAAI1 in the genetic realm. Due to climate change and anthropogenic reasons, there is a rise in sea level which raises a concern of salinity stress. It is tackled through osmotic adjustment and ion homeostasis, mediated by genes like P5CS, P5CR, GSH1, GSH2, and SPS, and ion transporters like NHX, NKT, and SKC, respectively. Oxidative damage is reduced by a complex action of antioxidants, scavenging RONS. A complex action of genes mediates cold stress with studies highlighting the roles of OsWRKY71, microRNA2871b, OsDOF1, and OsICE1. There is a need to research the mechanism of action of proteins like OsRbohA in ROS control and the action of regulatory genes in stress response. This is highly relevant due to the changing climate which will raise a lot of environmental changes that will adversely affect production and global food security if certain countermeasures are not taken. Overall, this study aims to unravel the molecular intricacies of ROS and RNS signaling networks in Oryza plants under stress conditions, with the ultimate goal of informing strategies for enhancing stress tolerance and crop performance in this important agricultural genus.
Collapse
Affiliation(s)
- P S Abhijith Shankar
- School of Basic Sciences, Department of Botany, Central University of Punjab, Bathinda, 151401, Punjab, India
| | - Pallabi Parida
- School of Basic Sciences, Department of Botany, Central University of Punjab, Bathinda, 151401, Punjab, India
| | - Rupesh Bhardwaj
- School of Basic Sciences, Department of Botany, Central University of Punjab, Bathinda, 151401, Punjab, India
| | - Ankush Yadav
- School of Basic Sciences, Department of Botany, Central University of Punjab, Bathinda, 151401, Punjab, India
| | - Prashant Swapnil
- School of Basic Sciences, Department of Botany, Central University of Punjab, Bathinda, 151401, Punjab, India.
| | | | - Mukesh Meena
- Laboratory of Phytopathology and Microbial Biotechnology, Department of Botany, Mohanlal Sukhadia University, Udaipur, 313001, Rajasthan, India.
| |
Collapse
|
2
|
Nguyen HTT, Das Bhowmik S, Long H, Cheng Y, Mundree S, Hoang LTM. Rapid Accumulation of Proline Enhances Salinity Tolerance in Australian Wild Rice Oryza australiensis Domin. PLANTS (BASEL, SWITZERLAND) 2021; 10:2044. [PMID: 34685853 PMCID: PMC8540606 DOI: 10.3390/plants10102044] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Revised: 09/26/2021] [Accepted: 09/27/2021] [Indexed: 12/19/2022]
Abstract
Proline has been reported to play an important role in helping plants cope with several stresses, including salinity. This study investigates the relationship between proline accumulation and salt tolerance in an accession of Australian wild rice Oryza australiensis Domin using morphological, physiological, and molecular assessments. Seedlings of O. australiensis wild rice accession JC 2304 and two other cultivated rice Oryza sativa L. cultivars, Nipponbare (salt-sensitive), and Pokkali (salt-tolerant), were screened at 150 mM NaCl for 14 days. The results showed that O. australiensis was able to rapidly accumulate free proline and lower osmotic potential at a very early stage of salt stress compared to cultivated rice. The qRT-PCR result revealed that O. australiensis wild rice JC 2304 activated proline synthesis genes OsP5CS1, OsP5CS2, and OsP5CR and depressed the expression of proline degradation gene OsProDH as early as 1 h after exposure to salinity stress. Wild rice O. australiensis and Pokkali maintained their relative water content and cell membrane integrity during exposure to salinity stress, while the salt-sensitive Nipponbare failed to do so. An analysis of the sodium and potassium contents suggested that O. australiensis wild rice JC 2304 adapted to ionic stress caused by salinity by maintaining a low Na+ content and low Na+/K+ ratio in the shoots and roots. This demonstrates that O. australiensis wild rice may use a rapid accumulation of free proline as a strategy to cope with salinity stress.
Collapse
Affiliation(s)
- Ha Thi Thuy Nguyen
- Centre for Agriculture and the Bioeconomy, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia; (S.D.B.); (H.L.); (Y.C.); (S.M.)
| | | | | | | | | | - Linh Thi My Hoang
- Centre for Agriculture and the Bioeconomy, Queensland University of Technology (QUT), 2 George Street, Brisbane, QLD 4000, Australia; (S.D.B.); (H.L.); (Y.C.); (S.M.)
| |
Collapse
|
3
|
Chen G, Zhang D, Pan J, Yue J, Shen X. Cathepsin B-like cysteine protease ApCathB negatively regulates cryo-injury tolerance in transgenic Arabidopsis and Agapanthus praecox. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2021; 308:110928. [PMID: 34034876 DOI: 10.1016/j.plantsci.2021.110928] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 04/17/2021] [Accepted: 04/24/2021] [Indexed: 05/11/2023]
Abstract
Cell death is an inevitably cryo-injury in cell and tissue cryopreservation. The research on programmed cell death (PCD) in plant cryopreservation is still in its infancy. In this study, the survival rate of Agapanthus praecox embryogenic callus was significantly improved when the vitrification solution was added with 20 μM E-64, which is an inhibitor of cathepsin B. For further investigating the relation between cathepsin B and cryo-injury, the coding gene of cathepsin B, ApCathB was isolated and characterized. A subcellular localization assay showed that ApCathB was located in cytomembrane. Heterologous overexpression of ApCathB reduced the recovery rate during Arabidopsis seedlings cryopreservation from 29.56 % to 16.46 %. Transgenic seedlings lost most of cell viability in hypocotyl after dehydration and lead to aggravated cryo-injury. The reduced survival rate of ApCathB-overexpressing embryogenic callus of A. praecox further confirmed its negatively function in cryo-injury tolerance. In addition, the survival of ApCathB-overexpressing lines was almost rescued by E-64. TUNEL detection showed intensified signal and ROS was burst, especially for H2O2. Furthermore, VPE, Metacaspase 1, Cyp15a and AIF genes related to cell death regulation were remarkably up-regulated in ApCathB-overexpressing embryogenic callus during cryopreservation. Additionally, the expression level of genes regulating cell degradation was also elevated, indicating accelerated cell death caused by ApCathB-overexpressing. Taken together, this work verified that ApCathB negatively regulated the cryo-injury tolerance and cell viability through mediating the PCD event in plant cryopreservation. Significantly, cathepsin B has potential to be a target to improve survival rate after cryopreservation.
Collapse
Affiliation(s)
- Guanqun Chen
- School of Design, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Di Zhang
- School of Design, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Jian Pan
- School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Jianhua Yue
- College of Horticulture, Xinyang Agriculture and Forestry University, Xinyang, 464100, China.
| | - Xiaohui Shen
- School of Design, Shanghai Jiao Tong University, Shanghai, 200240, China.
| |
Collapse
|
4
|
Wang D, Zhang M, Huang J, Zhou R, Jin Y, Wu C. Zygosaccharomyces rouxii Combats Salt Stress by Maintaining Cell Membrane Structure and Functionality. J Microbiol Biotechnol 2020; 30:62-70. [PMID: 31635442 PMCID: PMC9728352 DOI: 10.4014/jmb.1904.04006] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Zygosaccharomyces rouxii is an important yeast that is required in the food fermentation process due to its high salt tolerance. In this study, the responses and resistance strategies of Z. rouxii against salt stress were investigated by performing physiological analysis at membrane level. The results showed that under salt stress, cell integrity was destroyed, and the cell wall was ruptured, which was accompanied by intracellular substance spillover. With an increase of salt concentrations, intracellular Na+ content increased slightly, whereas intracellular K+ content decreased significantly, which caused the increase of the intracellular Na+/K+ ratio. In addition, in response to salt stress, the activity of Na+/K+-ATPase increased from 0.54 to 2.14 μmol/mg protein, and the ergosterol content increased to 2.42-fold to maintain membrane stability. Analysis of cell membrane fluidity and fatty acid composition showed that cell membrane fluidity decreased and unsaturated fatty acid proportions increased, leading to a 101.21% rise in the unsaturated/saturated fatty acid ratio. The results presented in this study offer guidance in understanding the salt tolerance mechanism of Z. rouxii, and in developing new strategies to increase the industrial utilization of this species under salt stress.
Collapse
Affiliation(s)
- Dingkang Wang
- College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 60065, P.R. China,Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, P.R. China
| | - Min Zhang
- College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 60065, P.R. China,Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, P.R. China
| | - Jun Huang
- College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 60065, P.R. China,Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, P.R. China
| | - Rongqing Zhou
- College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 60065, P.R. China,Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, P.R. China
| | - Yao Jin
- College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 60065, P.R. China,Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, P.R. China,Corresponding authors Y.J. Phone: +86-13882197633 Fax: +86-28-85405237 E-mail:
| | - Chongde Wu
- College of Light Industry, Textile and Food Engineering, Sichuan University, Chengdu 60065, P.R. China,Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, P.R. China,C.W. Phone: +86-28-85406149 Fax: +86-28-85405237 E-mail:
| |
Collapse
|
5
|
Jaiswal S, Gautam RK, Singh RK, Krishnamurthy SL, Ali S, Sakthivel K, Iquebal MA, Rai A, Kumar D. Harmonizing technological advances in phenomics and genomics for enhanced salt tolerance in rice from a practical perspective. RICE (NEW YORK, N.Y.) 2019; 12:89. [PMID: 31802312 PMCID: PMC6892996 DOI: 10.1186/s12284-019-0347-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Accepted: 11/06/2019] [Indexed: 05/12/2023]
Abstract
Half of the global human population is dependent on rice as a staple food crop and more than 25% increase in rice productivity is required to feed the global population by 2030. With increase in irrigation, global warming and rising sea level, rising salinity has become one of the major challenges to enhance the rice productivity. Since the loss on this account is to the tune of US$12 billion per annum, it necessitates the global attention. In the era of technological advancement, substantial progress has been made on phenomics and genomics data generation but reaping benefit of this in rice salinity variety development in terms of cost, time and precision requires their harmonization. There is hardly any comprehensive holistic review for such combined approach. Present review describes classical salinity phenotyping approaches having morphological, physiological and biochemical components. It also gives a detailed account of invasive and non-invasive approaches of phenomic data generation and utilization. Classical work of rice salinity QLTs mapping in the form of chromosomal atlas has been updated. This review describes how QTLs can be further dissected into QTN by GWAS and transcriptomic approaches. Opportunities and progress made by transgenic, genome editing, metagenomics approaches in combating rice salinity problems are discussed. Major aim of this review is to provide a comprehensive over-view of hitherto progress made in rice salinity tolerance research which is required to understand bridging of phenotype based breeding with molecular breeding. This review is expected to assist rice breeders in their endeavours by fetching greater harmonization of technological advances in phenomics and genomics for better pragmatic approach having practical perspective.
Collapse
Affiliation(s)
- Sarika Jaiswal
- Centre for Agricultural Bioinformatics, ICAR-Indian Agricultural Statistical Research Institute, PUSA, New Delhi, 110012, India
| | - R K Gautam
- Division of Field Crop Improvement & Protection, ICAR-Central Island Agricultural Research Institute, Port Blair, Andaman and Nicobar Islands, 744105, India.
| | - R K Singh
- Division of Plant Breeding Genetics and Biotechnology, International Rice Research Institute, DAPO Box 7777, Los Banos, Metro Manila, Philippines
| | - S L Krishnamurthy
- Division of Crop Improvement, ICAR-Central Soil Salinity Research Institute, Karnal, Haryana, 132001, India
| | - S Ali
- Division of Crop Improvement, ICAR-Central Soil Salinity Research Institute, Karnal, Haryana, 132001, India
| | - K Sakthivel
- Division of Field Crop Improvement & Protection, ICAR-Central Island Agricultural Research Institute, Port Blair, Andaman and Nicobar Islands, 744105, India
| | - M A Iquebal
- Centre for Agricultural Bioinformatics, ICAR-Indian Agricultural Statistical Research Institute, PUSA, New Delhi, 110012, India
| | - Anil Rai
- Centre for Agricultural Bioinformatics, ICAR-Indian Agricultural Statistical Research Institute, PUSA, New Delhi, 110012, India
| | - Dinesh Kumar
- Centre for Agricultural Bioinformatics, ICAR-Indian Agricultural Statistical Research Institute, PUSA, New Delhi, 110012, India.
| |
Collapse
|
6
|
Kessens R, Sorensen N, Kabbage M. An inhibitor of apoptosis (SfIAP) interacts with SQUAMOSA promoter-binding protein (SBP) transcription factors that exhibit pro-cell death characteristics. PLANT DIRECT 2018; 2:e00081. [PMID: 31245745 PMCID: PMC6508781 DOI: 10.1002/pld3.81] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 06/07/2018] [Accepted: 07/18/2018] [Indexed: 06/09/2023]
Abstract
Despite the importance of proper cell death regulation across broad evolutionary distances, an understanding of the molecular machinery underpinning this fundamental process in plants remains largely elusive. This is despite its critical importance to development, homeostasis, and proper responses to stress. The identification of endogenous plant regulators of cell death has been hindered by the fact that many core regulators of cell death in animals are absent in plant genomes. Remarkably, numerous studies have shown that the ectopic expression of animal prosurvival genes in plants can suppress cell death imposed by many stresses. In this study, we capitalize on the ectopic expression of one of these animal prosurvival genes, an inhibitor of apoptosis from Spodoptera frugiperda (SfIAP), to identify novel cell death regulators in plants. A yeast two-hybrid assay was conducted using SfIAP as bait to screen a tomato cDNA library. This screen identified several transcription factors of the SQUAMOSA promoter-binding protein (SBP) family as potential SfIAP binding partners. We confirmed this interaction in vivo for our top two interactors, SlySBP8b and SlySBP12a, using coimmunoprecipitation. Interestingly, overexpression of SlySBP8b and SlySBP12a induced cell death in Nicotiana benthamiana leaves. Overexpression of these two transcription factors also induced the accumulation of reactive oxygen species and enhanced the growth of the necrotrophic pathogen Alternaria alternata. Fluorescence microscopy confirmed the nuclear localization of both SlySBP8b and SlySBP12a, while SlySBP12a was also localized to the ER membrane. These results suggest a prodeath role for SlySBP8b and SlySBP12a and implicate ER membrane tethering as a means of regulating SlySBP12a activity.
Collapse
Affiliation(s)
- Ryan Kessens
- Department of Plant PathologyUniversity of Wisconsin‐MadisonMadisonWisconsin
| | - Nick Sorensen
- Department of Plant PathologyUniversity of Wisconsin‐MadisonMadisonWisconsin
| | - Mehdi Kabbage
- Department of Plant PathologyUniversity of Wisconsin‐MadisonMadisonWisconsin
| |
Collapse
|
7
|
Le TTT, Williams B, Mundree SG. An osmotin from the resurrection plant Tripogon loliiformis (TlOsm) confers tolerance to multiple abiotic stresses in transgenic rice. PHYSIOLOGIA PLANTARUM 2018; 162:13-34. [PMID: 28466470 DOI: 10.1111/ppl.12585] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Revised: 03/27/2017] [Accepted: 04/04/2017] [Indexed: 05/18/2023]
Abstract
Osmotin is a key protein associated with abiotic and biotic stress response in plants. In this study, an osmotin from the resurrection plant Tripogon loliiformis (TlOsm) was characterized and functionally analyzed under abiotic stress conditions in T. loliiformis as well as in transgenic Nicotiana tabacum (tobacco) and Oryza sativa (rice) plants. Real-time PCR analysis on mixed elicitor cDNA libraries from T. loliiformis showed that TlOsm was upregulated a 1000-fold during the early stages of osmotic stresses (cold, drought, and salinity) in both shoots and roots but downregulated in shoots during heat stress. There was no change in TlOsm gene expression in roots of heat-stressed plants and during plant development. The plasma membrane localization of TlOsm was showed in fluorescent-tagged TlOsm tobacco plants using confocal laser scanning microscopic analysis. Transgenic rice plants expressing TlOsm were assessed for enhanced tolerance to salinity, drought and cold stresses. Constitutively expressed TlOsm in transgenic rice plants showed increased tolerance to cold, drought and salinity stress when compared with the wild-type and vector control counterparts. This was evidenced by maintained growth, retained higher water content and membrane integrity, and improved survival rate of TlOsm-expressing plants. The results thus indicate the involvement of TlOsm in plant response to multiple abiotic stresses, possibly through the signaling pathway, and highlight its potential applications for engineering crops with improved tolerance to cold, drought and salinity stress.
Collapse
Affiliation(s)
- Trang T T Le
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia
| | - Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia
| | - Sagadevan G Mundree
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia
| |
Collapse
|
8
|
Manimaran P, Venkata Reddy S, Moin M, Raghurami Reddy M, Yugandhar P, Mohanraj SS, Balachandran SM, Kirti PB. Activation-tagging in indica rice identifies a novel transcription factor subunit, NF-YC13 associated with salt tolerance. Sci Rep 2017; 7:9341. [PMID: 28839256 PMCID: PMC5570948 DOI: 10.1038/s41598-017-10022-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Accepted: 08/02/2017] [Indexed: 12/19/2022] Open
Abstract
Nuclear factor Y (NF-Y) is a heterotrimeric transcription factor with three distinct NF-YA, NF-YB and NF-YC subunits. It plays important roles in plant growth, development and stress responses. We have reported earlier on development of gain-of-function mutants in an indica rice cultivar, BPT-5204. Now, we screened 927 seeds from 70 Ac/Ds plants for salinity tolerance and identified one activation-tagged salt tolerant DS plant (DS-16, T3 generation) that showed enhanced expression of a novel 'histone-like transcription factor' belonging to rice NF-Y subfamily C and was named as OsNF-YC13. Localization studies using GFP-fusion showed that the protein is localized to nucleus and cytoplasm. Real time expression analysis confirmed upregulation of transcript levels of OsNF-YC13 during salt treatment in a tissue specific manner. Biochemical and physiological characterization of the DS-16 revealed enhanced K+/Na+ ratio, proline content, chlorophyll content, enzymes with antioxidant activity etc. DS-16 also showed transcriptional up-regulation of genes that are involved in salinity tolerance. In-silico analysis of OsNF-YC13 promoter region evidenced the presence of various key stress-responsive cis-regulatory elements. OsNF-YC13 subunit alone does not appear to have the capacity for direct transcription activation, but appears to interact with the B- subunits in the process of transactivation.
Collapse
Affiliation(s)
- P Manimaran
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 5000046, India.
| | - S Venkata Reddy
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 5000046, India
| | - Mazahar Moin
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 5000046, India
| | - M Raghurami Reddy
- Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - Poli Yugandhar
- Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - S S Mohanraj
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 5000046, India
| | - S M Balachandran
- Indian Institute of Rice Research, Rajendranagar, Hyderabad, 500030, India
| | - P B Kirti
- Department of Plant Sciences, University of Hyderabad, Hyderabad, 5000046, India.
| |
Collapse
|
9
|
Kabbage M, Kessens R, Bartholomay LC, Williams B. The Life and Death of a Plant Cell. ANNUAL REVIEW OF PLANT BIOLOGY 2017; 68:375-404. [PMID: 28125285 DOI: 10.1146/annurev-arplant-043015-111655] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Like all eukaryotic organisms, plants possess an innate program for controlled cellular demise termed programmed cell death (PCD). Despite the functional conservation of PCD across broad evolutionary distances, an understanding of the molecular machinery underpinning this fundamental program in plants remains largely elusive. As in mammalian PCD, the regulation of plant PCD is critical to development, homeostasis, and proper responses to stress. Evidence is emerging that autophagy is key to the regulation of PCD in plants and that it can dictate the outcomes of PCD execution under various scenarios. Here, we provide a broad and comparative overview of PCD processes in plants, with an emphasis on stress-induced PCD. We also discuss the implications of the paradox that is functional conservation of apoptotic hallmarks in plants in the absence of core mammalian apoptosis regulators, what that means, and whether an equivalent form of death occurs in plants.
Collapse
Affiliation(s)
- Mehdi Kabbage
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, Wisconsin 53706;
| | - Ryan Kessens
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, Wisconsin 53706;
| | - Lyric C Bartholomay
- Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, Wisconsin 53706
| | - Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Queensland 4001, Australia;
| |
Collapse
|
10
|
Improvement of Salinity Stress Tolerance in Rice: Challenges and Opportunities. AGRONOMY-BASEL 2016. [DOI: 10.3390/agronomy6040054] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
11
|
Karbaschi MR, Williams B, Taji A, Mundree SG. Tripogon loliiformis elicits a rapid physiological and structural response to dehydration for desiccation tolerance. FUNCTIONAL PLANT BIOLOGY : FPB 2016; 43:643-655. [PMID: 32480493 DOI: 10.1071/fp15213] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 11/07/2015] [Indexed: 06/11/2023]
Abstract
Resurrection plants can withstand extreme dehydration to an air-dry state and then recover upon receiving water. Tripogon loliiformis (F.Muell.) C.E.Hubb. is a largely uncharacterised native Australian desiccation-tolerant grass that resurrects from the desiccated state within 72h. Using a combination of structural and physiological techniques the structural and physiological features that enable T. loliiformis to tolerate desiccation were investigated. These features include: (i) a myriad of structural changes such as leaf folding, cell wall folding and vacuole fragmentation that mitigate desiccation stress, (ii) potential role of sclerenchymatous tissue within leaf folding and radiation protection, (iii) retention of ~70% chlorophyll in the desiccated state, (iv) early response of photosynthesis to dehydration by 50% reduction and ceasing completely at 80 and 70% relative water content, respectively, (v) a sharp increase in electrolyte leakage during dehydration, and (vi) confirmation of membrane integrity throughout desiccation and rehydration. Taken together, these results demonstrate that T. loliiformis implements a range of structural and physiological mechanisms that minimise mechanical, oxidative and irradiation stress. These results provide powerful insights into tolerance mechanisms for potential utilisation in the enhancement of stress-tolerance in crop plants.
Collapse
Affiliation(s)
- Mohammad Reza Karbaschi
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, PO Box 2434, Brisbane, Qld 4001, Australia
| | - Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, PO Box 2434, Brisbane, Qld 4001, Australia
| | - Acram Taji
- School of Earth, Environmental and Biological Sciences, Science and Engineering Faculty, Queensland University of Technology, M Block Level 5, 528, Brisbane, Qld, 4001, Australia
| | - Sagadevan G Mundree
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, PO Box 2434, Brisbane, Qld 4001, Australia
| |
Collapse
|
12
|
Williams B, Njaci I, Moghaddam L, Long H, Dickman MB, Zhang X, Mundree S. Trehalose Accumulation Triggers Autophagy during Plant Desiccation. PLoS Genet 2015; 11:e1005705. [PMID: 26633550 PMCID: PMC4669190 DOI: 10.1371/journal.pgen.1005705] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 11/06/2015] [Indexed: 12/19/2022] Open
Abstract
Global climate change, increasingly erratic weather and a burgeoning global population are significant threats to the sustainability of future crop production. There is an urgent need for the development of robust measures that enable crops to withstand the uncertainty of climate change whilst still producing maximum yields. Resurrection plants possess the unique ability to withstand desiccation for prolonged periods, can be restored upon watering and represent great potential for the development of stress tolerant crops. Here, we describe the remarkable stress characteristics of Tripogon loliiformis, an uncharacterised resurrection grass and close relative of the economically important cereals, rice, sorghum, and maize. We show that T. loliiformis survives extreme environmental stress by implementing autophagy to prevent Programmed Cell Death. Notably, we identified a novel role for trehalose in the regulation of autophagy in T.loliiformis. Transcriptome, Gas Chromatography Mass Spectrometry, immunoblotting and confocal microscopy analyses directly linked the accumulation of trehalose with the onset of autophagy in dehydrating and desiccated T. loliiformis shoots. These results were supported in vitro with the observation of autophagosomes in trehalose treated T. loliiformis leaves; autophagosomes were not detected in untreated samples. Presumably, once induced, autophagy promotes desiccation tolerance in T.loliiformis, by removal of cellular toxins to suppress programmed cell death and the recycling of nutrients to delay the onset of senescence. These findings illustrate how resurrection plants manipulate sugar metabolism to promote desiccation tolerance and may provide candidate genes that are potentially useful for the development of stress tolerant crops.
Collapse
Affiliation(s)
- Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Isaac Njaci
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Lalehvash Moghaddam
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Hao Long
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Martin B Dickman
- Department of Plant Pathology and Microbiology, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, Texas, United States of America
| | - Xiuren Zhang
- Department of Biochemistry and Biophysics, Institute for Plant Genomics and Biotechnology, Texas A&M University, College Station, Texas, United States of America
| | - Sagadevan Mundree
- Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Queensland, Australia
| |
Collapse
|
13
|
Hoang TML, Moghaddam L, Williams B, Khanna H, Dale J, Mundree SG. Development of salinity tolerance in rice by constitutive-overexpression of genes involved in the regulation of programmed cell death. FRONTIERS IN PLANT SCIENCE 2015; 6:175. [PMID: 25870602 PMCID: PMC4378369 DOI: 10.3389/fpls.2015.00175] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2014] [Accepted: 03/04/2015] [Indexed: 05/18/2023]
Abstract
Environmental factors contribute to over 70% of crop yield losses worldwide. Of these drought and salinity are the most significant causes of crop yield reduction. Rice is an important staple crop that feeds more than half of the world's population. However among the agronomically important cereals rice is the most sensitive to salinity. In the present study we show that exogenous expression of anti-apoptotic genes from diverse origins, AtBAG4 (Arabidopsis), Hsp70 (Citrus tristeza virus) and p35 (Baculovirus), significantly improves salinity tolerance in rice at the whole plant level. Physiological, biochemical and agronomical analyses of transgenic rice expressing each of the anti-apoptotic genes subjected to salinity treatment demonstrated traits associated with tolerant varieties including, improved photosynthesis, membrane integrity, ion and ROS maintenance systems, growth rate, and yield components. Moreover, FTIR analysis showed that the chemical composition of salinity-treated transgenic plants is reminiscent of non-treated, unstressed controls. In contrast, wild type and vector control plants displayed hallmark features of stress, including pectin degradation upon subjection to salinity treatment. Interestingly, despite their diverse origins, transgenic plants expressing the anti-apoptotic genes assessed in this study displayed similar physiological and biochemical characteristics during salinity treatment thus providing further evidence that cell death pathways are conserved across broad evolutionary kingdoms. Our results reveal that anti-apoptotic genes facilitate maintenance of metabolic activity at the whole plant level to create favorable conditions for cellular survival. It is these conditions that are crucial and conducive to the plants ability to tolerate/adapt to extreme environments.
Collapse
Affiliation(s)
- Thi M. L. Hoang
- Centre for Tropical Crops and Biocommodities, Queensland University of TechnologyBrisbane, QLD, Australia
| | - Lalehvash Moghaddam
- Centre for Tropical Crops and Biocommodities, Queensland University of TechnologyBrisbane, QLD, Australia
| | - Brett Williams
- Centre for Tropical Crops and Biocommodities, Queensland University of TechnologyBrisbane, QLD, Australia
| | | | - James Dale
- Centre for Tropical Crops and Biocommodities, Queensland University of TechnologyBrisbane, QLD, Australia
| | - Sagadevan G. Mundree
- Centre for Tropical Crops and Biocommodities, Queensland University of TechnologyBrisbane, QLD, Australia
| |
Collapse
|