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Sade N, Del Mar Rubio-Wilhelmi M, Umnajkitikorn K, Blumwald E. Stress-induced senescence and plant tolerance to abiotic stress. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:845-853. [PMID: 28992323 DOI: 10.1093/jxb/erx235] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/14/2017] [Indexed: 05/20/2023]
Abstract
Senescence is an age-dependent process, ultimately leading to plant death, that in annual crop plants overlaps with the reproductive stage of development. Research on the molecular and biochemical mechanisms of leaf senescence has revealed a multi-layered regulatory network operating to control age-dependent processes. Abiotic stress-induced senescence challenges source-sink relationships and results in significant reduction in crop yields. Although processes associated with plant senescence are well studied, the mechanisms regulating stress-induced senescence are not well known. Here, we discuss the effects of abiotic stress on crop productivity, mechanisms associated with stress-induced senescence, and the possible use of these mechanisms for the generation of plant stress tolerance. We emphasize the involvement of source strength and stability of the photosynthetic apparatus in this process, and suggest a possible role of a perennial plant life strategy for the amelioration of stress-induced senescence.
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Affiliation(s)
- Nir Sade
- Department of Plant Sciences, University of California, Davis, CA, USA
| | | | | | - Eduardo Blumwald
- Department of Plant Sciences, University of California, Davis, CA, USA
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Czolpinska M, Rurek M. Plant Glycine-Rich Proteins in Stress Response: An Emerging, Still Prospective Story. FRONTIERS IN PLANT SCIENCE 2018; 9:302. [PMID: 29568308 PMCID: PMC5852109 DOI: 10.3389/fpls.2018.00302] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 02/21/2018] [Indexed: 05/21/2023]
Abstract
Seed plants are sessile organisms that have developed a plethora of strategies for sensing, avoiding, and responding to stress. Several proteins, including the glycine-rich protein (GRP) superfamily, are involved in cellular stress responses and signaling. GRPs are characterized by high glycine content and the presence of conserved segments including glycine-containing structural motifs composed of repetitive amino acid residues. The general structure of this superfamily facilitates division of GRPs into five main subclasses. Although the participation of GRPs in plant stress response has been indicated in numerous model and non-model plant species, relatively little is known about the key physiological processes and molecular mechanisms in which those proteins are engaged. Class I, II, and IV members are known to be involved in hormone signaling, stress acclimation, and floral development, and are crucial for regulation of plant cells growth. GRPs of class IV [RNA-binding proteins (RBPs)] are involved in alternative splicing or regulation of transcription and stomatal movement, seed, pollen, and stamen development; their accumulation is regulated by the circadian clock. Owing to the fact that the overexpression of GRPs can confer tolerance to stress (e.g., some are involved in cold acclimation and may improve growth at low temperatures), these proteins could play a promising role in agriculture through plant genetic engineering. Consequently, isolation, cloning, characterization, and functional validation of novel GRPs expressed in response to the diverse stress conditions are expected to be growing areas of research in the coming years. According to our knowledge, this is the first comprehensive review on participation of plant GRPs in the response to diverse stress stimuli.
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Olenieva V, Lytvyn D, Yemets A, Bergounioux C, Blume Y. Tubulin acetylation accompanies autophagy development induced by different abiotic stimuli in Arabidopsis thaliana. Cell Biol Int 2017; 43:1056-1064. [PMID: 28816419 DOI: 10.1002/cbin.10843] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 08/12/2017] [Indexed: 12/31/2022]
Abstract
Microtubules (MTs) play an important role in the regulation of autophagy development in yeast and animal as well as in plant cells. MTs participate in maturation and traffic of autophagosomes through their dynamic state changes and post-translational modifications of tubulin, namely acetylation. We subjected Arabidopsis thaliana seedlings to metabolic-, salt-, osmotic stresses as well as irradiation of ultraviolet B and investigated the involvement of plant MTs in the development of stress-induced autophagy via tubulin acetylation. For this purpose Arabidopsis thaliana line expressing autophagy-related protein 8 h (atg8h)-GFP was generated to investigate autophagy, applying the level of free GFP as an indicator of autophagy development. Using autophagosome confocal imaging and Western blot analysis of Atg8 post-translational lipidation and synchronous GFP release it was shown that all examined stressful stimuli led to pronounced development of autophagy, particularly in different root tissues. Moreover, autophagy development was accompanied by α-tubulin acetylation under all stressful conditions. Presented data indicate the possible role of the post-translational acetylation of α-tubulin in the mediation of plant stress-induced autophagy.
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Affiliation(s)
- Vira Olenieva
- Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Dmytro Lytvyn
- Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Alla Yemets
- Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Catherine Bergounioux
- Laboratory of Cell Cycle Chromatin and Development, Institute of Plant Sciences Paris-Saclay IPS2, CNRS 9213, INRA 1403, Université Paris-Sud, Université Evry Val d'Essonne, Université Paris Diderot, Sorbonne Paris-Cite, Universite Paris-Saclay, Orsay, France
| | - Yaroslav Blume
- Institute of Food Biotechnology and Genomics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
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Wei Y, Liu W, Hu W, Liu G, Wu C, Liu W, Zeng H, He C, Shi H. Genome-wide analysis of autophagy-related genes in banana highlights MaATG8s in cell death and autophagy in immune response to Fusarium wilt. PLANT CELL REPORTS 2017; 36:1237-1250. [PMID: 28451821 DOI: 10.1007/s00299-017-2149-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 04/22/2017] [Indexed: 05/02/2023]
Abstract
KEY MESSAGE MaATG8s play important roles in hypersensitive-like cell death and immune response, and autophagy is essential for disease resistance against Foc in banana. Autophagy is responsible for the degradation of damaged cytoplasmic constituents in the lysosomes or vacuoles. Although the effects of autophagy have been extensively revealed in model plants, the possible roles of autophagy-related gene in banana remain unknown. In this study, 32 MaATGs were identified in the draft genome, and the profiles of several MaATGs in response to fungal pathogen Fusarium oxysporum f. sp. cubense (Foc) were also revealled. We found that seven MaATG8s were commonly regulated by Foc. Through transient expression in Nicotiana benthamiana leaves, we highlight the novel roles of MaATG8s in conferring hypersensitive-like cell death, and MaATG8s-mediated hypersensitive response-like cell death is dependent on autophagy. Notablly, autophagy inhibitor 3-methyladenine (3-MA) treatment resulted in decreased disease resistance in response to Foc4, and the effect of 3-MA treatment could be rescued by exogenous salicylic acid, jasmonic acid and ethylene, indicating the involvement of autophagy-mediated plant hormones in banana resistance to Fusarium wilt. Taken together, this study may extend our understanding the putative role of MaATG8s in hypersensitive-like cell death and the essential role of autophagy in immune response against Foc in banana.
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Affiliation(s)
- Yunxie Wei
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China
| | - Wen Liu
- Biotechnology Research Center, College of Biological and Pharmaceutical Sciences, China Three Gorges University, Yichang, 443002, Hubei, China
| | - Wei Hu
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Xueyuan Road 4, Haikou, 571101, Hainan, China
| | - Guoyin Liu
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China
| | - Chunjie Wu
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China
| | - Wei Liu
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China
| | - Hongqiu Zeng
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China
| | - Chaozu He
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China
| | - Haitao Shi
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources and College of Biology, Institute of Tropical Agriculture and Forestry, Hainan University, Haikou, 570228, China.
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Luo L, Zhang P, Zhu R, Fu J, Su J, Zheng J, Wang Z, Wang D, Gong Q. Autophagy Is Rapidly Induced by Salt Stress and Is Required for Salt Tolerance in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2017; 8:1459. [PMID: 28878796 PMCID: PMC5572379 DOI: 10.3389/fpls.2017.01459] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Accepted: 08/04/2017] [Indexed: 05/18/2023]
Abstract
Salinity stress challenges agriculture and food security globally. Upon salt stress, plant growth slows down, nutrients are recycled, osmolytes are produced, and reallocation of Na+ takes place. Since autophagy is a high-throughput degradation pathway that contributes to nutrient remobilization in plants, we explored the involvement of autophagic flux in salt stress response of Arabidopsis with various approaches. Confocal microscopy of GFP-ATG8a in transgenic Arabidopsis showed that autophagosome formation is induced shortly after salt treatment. Immunoblotting of ATG8s and the autophagy receptor NBR1 confirmed that the level of autophagy peaks within 30 min of salt stress, and then settles to a new homeostasis in Arabidopsis. Such an induction is absent in mutants defective in autophagy. Within 3 h of salt treatment, accumulation of oxidized proteins is alleviated in the wild-type; however, such a reduction is not seen in atg2 or atg7. Consistently, the Arabidopsis atg mutants are hypersensitive to both salt and osmotic stresses, and plants overexpressing ATG8 perform better than the wild-type in germination assays. Quantification of compatible osmolytes further confirmed that the autophagic flux contributes to salt stress adaptation. Imaging of intracellular Na+ revealed that autophagy is required for Na+ sequestration in the central vacuole of root cortex cells following salt treatment. These data suggest that rapid protein turnover through autophagy is a prerequisite for salt stress tolerance in Arabidopsis.
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Affiliation(s)
| | | | | | | | | | | | | | - Dan Wang
- *Correspondence: Dan Wang, Qingqiu Gong,
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Wang W, Xu M, Wang G, Galili G. Autophagy: An Important Biological Process That Protects Plants from Stressful Environments. FRONTIERS IN PLANT SCIENCE 2016; 7:2030. [PMID: 28123390 PMCID: PMC5225088 DOI: 10.3389/fpls.2016.02030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 12/19/2016] [Indexed: 05/20/2023]
Affiliation(s)
- Wenyi Wang
- Department of Plant Science, Weizmann Institute of ScienceRehovot, Israel
- College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Mengyun Xu
- College of Horticulture, South China Agricultural UniversityGuangzhou, China
| | - Guoping Wang
- College of Horticulture, South China Agricultural UniversityGuangzhou, China
- *Correspondence: Guoping Wang
| | - Gad Galili
- Department of Plant Science, Weizmann Institute of ScienceRehovot, Israel
- Gad Galili
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