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Wheat adaptation to environmental stresses under climate change:Molecular basis and genetic improvement

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Molecular Plant 2023年第10期16卷 1564-1589页

作者： Hude Mao Cong Jiang Chunlei Tang Xiaojun Nie Linying Du Yuling Liu Peng Cheng Yunfeng Wu Huiquan Liu Zhensheng Kang Xiaojie Wang State Key Laboratory of Crop stress Biology for Arid Areas and College of Agronomy Northwest A&F UniversityYanglingShaanxi 712100China State Key Laboratory of Crop stress Biology for Arid Areas and College of Plant Protection Northwest A&F UniversityYanglingShaanxi 712100China State Key Laboratory of Crop stress Biology for Arid Areas and College of Life Science Northwest A&F UniversityYanglingShaanxi 712100China

Wheat(Triticum aestivum)is a staple food for about 40%of the world’s population.As the global population has grown and living standards improved,high yield and improved nutritional quality have become the main targets for wheat breeding.However,wheat production has been compromised by global warming through the more frequent occurrence of extreme temperature events,which have increased water scarcity,aggravated soil salinization,caused plants to be more vulnerable to diseases,and directly reduced plant fertility and suppressed yield.One promising option to address these challenges is the genetic improvement of wheat for enhanced resistance to environmental stress.Several decades of progress in genomics and genetic engineering has tremendously advanced our understanding of the molecular and genetic mechanisms underlying abiotic and biotic stress responses in wheat.These advances have heralded what might be considered a“golden age”of functional genomics for the genetic improvement of wheat.Here,we summarize the current knowledge on the molecular and genetic basis of wheat resistance to abiotic and biotic stresses,including the QTLs/genes involved,their functional and regulatory mechanisms,and strategies for genetic modification of wheat for improved stress resistance.In addition,we also provide perspectives on some key challenges that need to be addressed.

关键词： wheat genomics genetic improvement abiotic stress biotic stress climate change

Mitogen-activated protein kinase cascades in plant signaling

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Journal of Integrative Plant Biology 2022年第2期64卷 301-341页

作者： Mengmeng Zhang Shuqun Zhang The Key Laboratory of Plant Immunity College of Plant ProtectionNanjing Agricultural UniversityNanjing210095 China Division of Biochemistry University of MissouriColumbiaMO65211 USA

Mitogen-activated protein kinase(MAPK)cascades are key signaling modules downstream of receptors/sensors that perceive either endogenously produced stimuli such as peptide ligands and damage-associated molecular patterns(DAMPs)or exogenously originated stimuli such as pathogen/microbe-associated molecular patterns(P/MAMPs),pathogen-derived effectors,and environmental factors.In this review,we provide a historic view of plant MAPK research and summarize recent advances in the establishment of MAPK cascades as essential components in plant immunity,response to environmental stresses,and normal growth and development.Each tier of the MAPK cascades is encoded by a small gene family,and multi ple members can function redundantly in an MAPK cascade.Yet,they carry out a diverse array of biological functions in plants.How the signaling specificity is achieved has become an interesting topic of MAPK research.Future investigations into the molecular mechanism(s)underlying the regulation of MAPK activation including the activation kinetics and magnitude in response to a stimulus,the spatiotemporal expression patterns of all the components in the signaling pathway,and functional characterization of novel MAPK substrates are central to our understanding of MAPK functions and signaling specificity in plants.

关键词： abiotic stress ligand-receptor interaction mitogenactivated protein kinase MAPK substrate plant growth and development plant hormone plant immunity receptor-like protein kinase signal transduction

Zinc-finger protein GmZF351 improves both salt and drought stress tolerance in soybean

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Journal of Integrative Plant Biology 2023年第7期65卷 1636-1650页

作者： Wei Wei Long Lu Xiao-Hua Bian Qing-Tian Li Jia-Qi Han Jian-Jun Tao Cui-Cui Yin Yong-Cai Lai Wei Li Ying-Dong Bi Wei-Qun Man Shou-Yi Chen Jin-Song Zhang Wan-Ke Zhang State Key Lab of Plant Genomics Institute of Genetics and Developmental BiologyINASEEDChinese Academy of SciencesBeijing 100101China Key Lab of Ministry of Education for Genetics Breeding and Multiple Utilization of CropsCollege of Crop SciencesFujian Agriculture and Forestry UniversityFuzhou 350002China College of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Farming and Cultivation Heilongjiang Provincial Academy of Agricultural SciencesHarbin 150086China Institute of Soybean Research Heilongjiang Provincial Academy of Agricultural SciencesHarbin 150086China

abiotic stress is one of the most important factors reducing soybean yield. It is essential to identify regulatory factors contributing to stress responses.A previous study found that the tandem CCCH zincfinger protein Gm ZF351 is an oil level regulator. In this study, we discovered that the Gm ZF351 gene is induced by stress and that the overexpression of Gm ZF351 confers stress tolerance to transgenic soybean. Gm ZF351 directly regulates the expression of Gm CIPK9 and Gm SnRK, leading to stomata closing, by binding to their promoter regions, which carry two CT(G/C)(T/A)AA elements.stress induction of Gm ZF351 is mediated through reduction in the H3K27me3 level at the Gm ZF351locus.TwoJMJ30-demethylase-likegenes,Gm JMJ30-1 and Gm JMJ30-2, are involved in this demethylationprocess.Overexpressionof Gm JMJ30-1/2 in transgenic hairy roots enhances Gm ZF351 expression mediated by histone demethylation and confers stress tolerance to soybean.Yield-related agronomic traits were evaluated in stable Gm ZF351-transgenic plants under mild drought stress conditions. Our study reveals a new mode of Gm JMJ30-Gm ZF351 action in stress tolerance, in addition to that of Gm ZF351 in oil accumulation. Manipulation of the components in this pathway is expected to improve soybean traits and adaptation under unfavorable environments.

关键词： abiotic stress histone demethylation JMJ30 soybean TZF protein

Water stress resilient cereal crops:Lessons from wild relatives

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Journal of Integrative Plant Biology 2022年第2期64卷 412-430页

作者： Justine M.Toulotte Chrysoula K.Pantazopoulou Maria Angelica Sanclemente Laurentius A.C.JVoesenek Rashmi Sasidharan Department of Biology Plant EcophysiologyInstitute of Environmental BiologyUtrecht UniversityUtrecht3584 CH The Netherlands

Cereal crops are significant contributors to global diets.As climate change disrupts weather patterns and wreaks havoc on crops,the need for generating stress-resilient,high-yielding varieties is more urgent than ever.One extremely promising avenue in this regard is to exploit the tremendous genetic diversity expressed by the wild ancestors of current day crop species.These crop wild relatives thrive in a range of environments and accordingly often harbor an array of traits that allow them to do so.The identification and introgression of these traits into our staple cereal crops can lessen yield losses in stressful environments.In the last decades,a surge in extreme drought and flooding events have severely impacted cereal crop production.Climate models predict a persistence of this trend,thus reinforcing the need for research on water stress resilience.Here we review:(i)how water stress(drought and flooding)impacts crop performance;and(ii)how identification of tolerance traits and mechanisms from wild relatives of the main cereal crops,that is,rice,maize,wheat,and barley,can lead to improved survival and sustained yields in these crops under water stress conditions.

关键词： abiotic stress cereal crops climate change crop wild relatives drought flooding grass water stress

Genome-wide identification and expression analysis of the bZIP gene family in silver birch ( Betula pendula Roth.)

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Journal of Forestry Research 2022年第5期33卷 1615-1636页

作者： YaNan Jing Yue Yu Hanzeng Wang Ye Wu Chenghao Li State Key Laboratory of Tree Genetics and Breeding Northeast Forestry University26 Hexing RoadHarbin 150040People’s Republic of China

Basic Leu zipper ( bZIP ) genes play pivotal, versatile roles in abiotic or biotic stress responses and in other biological processes. Knowledge on the evolutionary relationships and patterns of gene expression of bZIP family members in woody plants, however, has been limited. Here we identified and characterized 47 BpbZIP genes across the silver birch ( Betula pendula Roth.) genome. With reference to bZIP classifications for Arabidopsis thaliana , all BpbZIP proteins clustered among 10 groups in phylogeny. The bZIP domains were divided into five patterns based on intron positions and splicing phases. A total of 24 conserved motifs were detected in BpbZIPs with high group specificity. We also analyzed the protein structure of the BpAREB/ABF/ ABI5 subfamily, the most important subfamily in the bZIP family. Expression analyses demonstrated that BpbZIP genes were widely involved in abscisic acid, salt, drought, and heat stress responses, with BpbZIP07/ABF4 and BpbZIP21/ABF2 most highly expressed. Our results on genome-wide identification, evolutionary relationships, gene structure, and motif and promoter element identification for BpbZIP family members in silver birch provide a comprehensive understanding of bZIP transcription factors in birch and will lead to a deeper understanding of their evolution and potential biological functions.

关键词： Basic Leu zipper gene Birch Abscisic acid abiotic stress Gene expression

Trehalose Biosynthesis in Response to abiotic stresses

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Journal of Integrative Plant Biology 2008年第10期50卷 1223-1229页

作者： Mihaela Iordachescu Ryozo Imai Crop Cold Tolerance Research Team National Agricultural Research Center for Hokkaido Region National Agriculture and Food Research Organization Hitsujigaoka 1 Toyohira-ku Sapporo 062-8555 Japan

Trehalose is a non-reducing disaccharide that is present in diverse organisms ranging from bacteria and fungi to invertebrates, in which it serves as an energy source, osmolyte or protein/membrane protectant. The occurrence of trehalose and trehalose biosynthesis pathway in plants has been discovered recently. Multiple studies have revealed regulatory roles of trehalose-6-phosphate, a precursor of trehalose, in sugar metabolism, growth and development in plants. Trehalose levels are generally quite low in plants but may alter in response to environmental stresses. Transgenic plants overexpressing microbial trehalose biosynthesis genes have been shown to contain increased levels of trehalose and display drought, salt and cold tolerance. In-silico expression profiling of all Arabidopsis trehalose-6-phosphate synthases （TPSs） and trehalose-6-phosphate phosphatases （TPPs） revealed that certain classes of TPS and TPP genes are differentially regulated in response to a variety of abiotic stresses. These studies point to the importance of trehalose biosynthesis in stress responses.

关键词： abiotic stress Arabidopsis cold stress drought stress rice stress tobacco trehalose trehalose biosynthesis.

Effects of plant growth-promoting rhizobacteria on the molecular responses of maize under drought and heat stresses: A review

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Pedosphere 2022年第1期32卷 90-106页

作者： Iviwe NOTUNUNU Lucy MOLELEKI Ashira ROOPNARAIN Rasheed ADELEKE Department of Biochemistry Genetics and MicrobiologyForestry and Agricultural Biotechnology InstituteUniversity of PretoriaLynnwood RdHatfieldPretoria 0002South Africa Microbiology and Environmental Biotechnology Research Group Agricultural Research Council—Natural Resources and EngineeringPrivate Bag X79Pretoria 0001South Africa Unit for Environment Science and Management North-West University(Potchefstroom Campus)Potchefstroom 2520South Africa

Drought and heat are major environmental stresses that continually influence plant growth and development. Under field conditions, these stresses occur more frequently in combination than alone, which magnifies corresponding detrimental effects on the growth and productivity of agriculturally important crops. Plant responses to such abiotic stresses are quite complex and manifested in a range of developmental, molecular, and physiological modifications that lead either to stress sensitivity or tolerance/resistance. Maize (Zea mays L.) is known for its sensitivity to abiotic stresses, which often results in substantial loss in crop productivity. Bioaugmentation with plant growth-promoting rhizobacteria (PGPR) has the potential to mitigate the adverse effects of drought and heat stresses on plants. Hence, this is considered a promising and eco-friendly strategy to ensure sustainable and long-term maize production under adverse climatic conditions. These microorganisms possess various plant growth-promoting (PGP) characteristics that can induce drought and heat tolerance in maize plants by directly or indirectly influencing molecular, metabolic, and physiological stress responses of plants. This review aims to assess the current knowledge regarding the ability of PGPR to induce drought and heat stress tolerance in maize plants. Furthermore, the drought and heat stress-induced expression of drought and heat stress response genes for this crop is discussed with the mechanisms through which PGPR alter maize stress response gene expression.

关键词： abiotic stress drought stress gene expression heat stress stress response gene stress tolerance Zea Mays L.

Genome-wide identification, expression analysis of auxin-responsive GH_3 family genes in maize(Zea mays L.) under abiotic stresses

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Journal of Integrative Plant Biology 2015年第9期57卷 783-795页

作者： Shangguo Feng Runqing Yue Sun Tao Yanjun Yang Lei Zhang Mingfeng Xu Huizhong Wang Chenjia Shen College of Life and Environmental Sciences Hangzhou Normal University Henan Academy of Agricultural Sciences Department of Plant Pathology Washington State University

Auxin is involved in different aspects of plant growth and development by regulating the expression of auxin-responsive family genes. As one of the three major auxin-responsive families, GH3 (Gretchen Hagen3) genes participate in auxin homeostasis by catalyzing auxin conjugation and bounding free indole-3-acetic acid (IAA) to amino acids. However, how GH3 genes function in responses to abiotic stresses and various hormones in maize is largely unknown. Here, the latest updated maize (Zea mays L.) reference genome sequence was used to characterize and analyze the ZmGH3 family genes from maize. The results showed that 13 ZmGH3 genes were mapped on five maize chromosomes (total 10 chromosomes). Highly diversified gene structures and tissue-specific expression patterns suggested the possibility of function diversification for these genes in response to environmental stresses and hormone stimuli. The expression patterns of ZmGH3 genes are responsive to several abiotic stresses (salt, drought and cadmium) and major stress-related hormones (abscisic acid, salicylic acid and jasmonic acid). Various environmental factors suppress auxin free IAA contents in maize roots suggesting that these abiotic stresses and hormones might alter GH3-mediated auxin levels. The respon-siveness of ZmGH3 genes to a wide range of abiotic stresses and stress-related hormones suggested that ZmGH3s are involved in maize tolerance to environmental stresses.

关键词： abiotic stress auxin auxin responsive gene GH3 gene family maize

Genomic analysis of isopentenyltransferase genes and functional characterization of TaIPT8 indicates positive effects of cytokinins on drought tolerance in wheat

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The Crop Journal 2023年第1期11卷 46-56页

作者： Na Wang Jun Chen Yuan Gao Yongbin Zhou Ming Chen Zhaoshi Xu Zhengwu Fang Youzhi Ma Hubei Collaborative Innovation Center for Grain Industry/College of Agriculture Yangtze UniversityJingzhou 434000HubeiChina Institute of Crop Sciences Chinese Academy of Agricultural Sciences/National Key Facility for Crop Gene Resources and Genetic ImprovementKey Laboratory of Biology and Genetic Improvement of Triticeae CropsMinistry of AgricultureBeijing 100081China

Cytokinins(CKs)function in plant development and during stress responses,but their role in drought tolerance in wheat is unknown.In the present study,24 isopentenyltransferase(IPT)genes,encoding ratelimiting enzymes in CK biosynthesis were identified in the wheat genome.The chromosomal locations and structures of the genes,protein properties,and phylogenetic relationships were characterized.ATP/ADP TaIPT genes showed tissue-specific expression.TaIPT2,TaIPT7,and TaIPT8 expression was rapidly induced by 0.5–1 h drought treatments,which decreased to low levels after 2 h drought treatment,as did most other TaIPT genes.TaIPT8-5a/5b/5d triple mutants showed decreased levels of tZtype CK under normal and drought conditions and reduced drought tolerance,which,however,did not manifest as phenotype alterations.By contrast,transgenic wheat plants with drought-induced TaIPT8showed increased drought tolerance.Our study provides a foundation for further investigation of TaIPT genes and novel insights into the role of CKs in the drought response of wheat.

关键词： TaIPT Phytohormone abiotic stress Cytokinin biosynthesis Wheat