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Underpinning the molecular programming attributing heat stress associated thermotoleranee in tea (Camellia sinensis (L.) O. Kuntze)

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Horticulture Research 2021年第1期8卷 1333-1351页

作者： Romit Seth tony kipkoech maritim Rajni Parmar Ram Kumar Sharma Biotechnology Department CSIR-I nstitute of Himalayan Bioresource Technology(CSIR-IHBT)PalampurHimachal Pradesh 176061India Academy of Scientific and Innovative Research(AcSIR) CSIR-HRDC CampusGhaziabadUttar Pradesh 201002India Teabreeding and genetic improvement division KALRO-Tea Research InstituteBox 82020200 KerichoKenya

The most daunting issue of global climate change is the deleterious impact of extreme temperatures on tea productivity and quality,which has resulted in a quest among researchers and *** current study aims to unravel molecular programming underpinning thermotolerance by characterizing heat tolerance and sensitivity response in 20 tea *** signi fi cantly higher negative in fl uence of heat stress was recorded in a sensitive cultivar with reduced water retention(47%),chlorophyll content(33.79%),oxidation potential(32.48%),and increase in membrane damage(76.4%).Transcriptional pro fi ling of most tolerant and sensitive cultivars identi fi ed 78 differentially expressed unigenes with chaperon domains,including low and high molecular weight heat shock protein(HSP)and heat shock transcription factors(HSFs)involved in heat shock response(HSR).Further,predicted transcriptional interactome network revealed their key role in thermotolerance via well-co-ordinated transcriptional regulation of aquaporins,starch metabolism,chlorophyll biosynthesis,calcium,and ethylene mediated plant signaling *** study identi fi ed the key role of HSPs(CsHSP90)in regulating HSR in tea,wherein,structure-based molecular docking revealed the inhibitory role of geldanamycin(GDA)on CsHSP90 by blocking ATP binding site at N-terminal domain of predicted ***,GDA mediated leaf disc inhibitor assay further af fi rmed enhanced HSR with higher expression of CsHSP17.6,CsHSP70,HSP101,and CsHSFA2 genes in *** the current study,efforts were made to extrapolate a deeper understanding of chaperons mediated regulation of HSR attributing thermotolerance in tea.

关键词： metabolism programming stress

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