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Combined Drought and Heat Stress in Rice: Responses, Phenotyping and Strategies to Improve Tolerance

Rice science 2021年第3期28卷 233-242页

作者： maria Vera Jesus DA COSTA Yamunarani RAmEGOWDA Venkategowda RAmEGOWDA Nataraja N.KARABA sheshshayee m.sreeman makarla UDAYAKUmAR Department of Crop Physiology University of Agricultural SciencesGandhi Krishi Vigyana KendraBangalore 560065India

Simultaneous occurrence of drought and heat stress will have significant negative impact on rice yield,especially under upland *** projected increase in global temperatures and reduced precipitation will increase the frequency of occurrence and intensity of these stresses,threatening rice *** recognizing the importance of combined stress in rice,the knowledge generated in this area is very *** complex,understanding combined stress tolerance of rice under water saving cultivation is more critical towards development of climate resilient rice ***,we summarized the effects of combined stress on rice physiology with more emphasis on reproductive *** responses,phenotyping and physiology challenges and potential strategies for improving combined stress tolerance in rice are also discussed.

关键词： rice drought stress heat stress combined stress flowering grain filling omics response phenotyping genetic enhancement

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A Simple and Rapid Oxidative Stress Screening method of Small molecules for Functional Studies of Transcription Factor

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Rice science 2022年第5期29卷 402-406,I0012-I0016页

作者： Vanitha ADHINARAYANREDDY Preethi VIJAYARAGHAVAREDDY Ashwin VARGHEESE Sujitha DADI Akshay UTTARKAR Vidya NIRANJAN Anuradha VENKATRAmAN sheshshayee m.sreeman Ramu S.VEmANNA Laboratory of Plant Functional Genomics Regional Centre for BiotechnologyFaridabad-Gurgaon ExpresswayFaridabad 121001India Department of Crop Physiology University of Agricultural SciencesBengaluru 560065India Department of Biotechnology Rashtreeya VidyalayaCollege of EngineeringBengaluru 560059India Department of Biochemistry&Biotechnology Annamalai UniversityChidambaram 608002India

Structure-assisted reverse chemical discovery approaches are becoming attractive due to target based ***,Small molecules(Sms)identified by reverse chemical genetic approach require robust phenotyping assays to study the plant *** optimized a screening method in rice seedlings using methyl viologen(mV)induced oxidative stress under high light *** method was suitable for studying the efficacy of Sm targeting oxidative stress related ***-assisted drug designing approach was used to identify Sm targeting DREB2A transcription factor(TF).Rice seedlings treated with pronetalol showed susceptible phenotype when exposed to oxidative *** inhibited the DREB2A activity and suppressed the expression of its target LEA7 and HSFA3 genes under oxidative *** assay is quite simple and robust and can be expanded to high throughput screening method for functional validation of TF.

关键词： inhibited oxidative Small

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Responses of Lowland, Upland and Aerobic Rice Genotypes to Water Limitation During Different Phases

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Rice science 2020年第4期27卷 345-354页

作者： Preethi VIJAYARAGHAVAREDDY YIN Xinyou Paul CSTRUIK Udayakumar mAKARLA sheshshayee sreeman Department of Crop Physiology University of Agricultural SciencesBengaluru 560065India Centre for Crop Systems Analysis Wageningen University&ResearchPO Box 4306700AK Wageningenthe Netherlands

Rice yield reduction due to water limitation depends on its severity and duration and on the phenological stage of its *** exposed three contrasting rice genotypes,IR64,UPLRi7 and Apo(adapted to lowland,upland and aerobic conditions,respectively),to three water regimes(puddle,100%and 60%field capacity)in pots during the vegetative(GSI),flowering(GSII)and grain filling(GSIII)*** at all the three stages significantly reduced yield especially in lowland genotype *** of water limitation was more severe at GSII than at the other two *** at GSI stage reduced both source activity(leaf area and photosynthetic rate)and sink capacity(tiller number or panicle number per pot).When stress was imposed at GSII,spikelet fertility was most affected in all the three *** both GSII and GSIII,although leaf area was constant in all the three water regimes,estimated relative whole-plant photosynthesis was strongly associated with yield *** photosynthesis due to stress at any given stage was found to have direct impact on *** to the other genotypes,Apo had deeper roots and maintained a better water relation,thus,higher carbon gain and spikelet viability,and ultimately,higher biomass and productivity under water-limited ***,screening for these stage-dependent adaptive mechanisms is crucial in breeding for sustained rice production under water limitation.

关键词： water limitation phenology upland aerobic Oryza sativa yield

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Acquired Traits Contribute more to Drought Tolerance in Wheat Than in Rice

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Plant Phenomics 2020年第1期2卷 172-187页

作者： Preethi Vijayaraghavareddy Ramu S.Vemanna Xinyou Yin Paul C.Struik Udayakumar makarla sheshshayee sreeman Department of Crop Physiology University of Agricultural SciencesBengaluruIndia Centre for Crop Systems Analysis Department of Plant SciencesWageningen University&ResearchPO Box 4306700 AK WageningenNetherlands Regional Centre for Biotechnology FaridabadHaryanaIndia

Drought tolerance is governed by constitutive and acquired *** them has relevance for sustaining crop productivity under *** levels of stress induce specific mechanisms that protect metabolism when stress becomes ***,we report a comparative assessment of“acquired drought tolerance(ADT)”traits in two rice cultivars,IR64(drought susceptible)and Apo(tolerant),and a drought-tolerant wheat cultivar,*** seedlings were exposed to progressive concentrations of methyl viologen(mV),a stress inducer,before transferring to a severe concentration.“Induced”seedlings showed higher tolerance and recovery growth than seedlings exposed directly to severe stress.A novel phenomic platform with an automated irrigation system was used for precisely imposing soil moisture stress to capture ADT traits during the vegetative *** progression of drought was achieved through a software-controlled automated irrigation *** facility allowed the maintenance of the same level of soil moisture irrespective of differences in transpiration,and hence,this platform provided the most appropriate method to assess ADT *** biomass decreased more in IR64 than in *** wheat cultivar showed lower levels of damage and higher recovery growth even compared to *** of ROS-scavenging enzymes and drought-responsive genes was significantly higher in Apo than in IR64,but differences were only marginal between Apo and *** wheat cultivar showed significantly higher stomatal conductance,carbon gain,and biomass than the rice cultivars,under *** differences in ADT traits between cultivars as well as between species can be utilised for improving drought tolerance in crop plants.

关键词： cultivar Wheat drought

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