STUDYING THE IMPORTANCE OF ACQUIRED TOLERANCE TRAITS TO EXPLOIT THEIR POTENTIAL IN CROP IMPROVEMENT PROGRAM

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dc.contributor.advisorSheshshayee, M .S
dc.contributor.authorLEKSHMY, V. S
dc.date.accessioned2023-01-03T14:08:11Z
dc.date.available2023-01-03T14:08:11Z
dc.date.issued2022-08-03
dc.description.abstractDrought tolerance in water limited aerobic conditions, from agronomic perspective is mostly achieved by maintaining yield. Plants have adopted various tolerance mechanisms mainly constitutive traits, and “acquired tolerance” traits (ATTs). ATTs are the traits that significantly upregulated when plants experience milder stress and are considered in the context of providing tolerance to plants when stress becomes severe. The present study demonstrated the relevance of precise stress imposition in capturing ATTs. An initial experiment was to understand plant responses to rapid and gradually progressing induction stress in contrasting genotypes. Induction stress showed significant recovery growth in both AC 39000 (tolerant) and BPT 5204 (susceptible). Further, to dissect the subcomponent and phenotyping technique for ATTs, a precise moisture stress was imposed using the novel drought-simulator phenomics platform, with its transpiration-interfaced automated irrigation. Gradually stressed plants showed a reduced oxidative stress level especially, a lower ROS content with increased scavenging activity. Genetic diversity for ATTs in 17 accessions from 3K panel showed a significant variation in ATTs especially for the superoxide (O2-), hydroxyl radical (OH. ), total antioxidant capacity (TAC) and proline content. Further, a set of 90 diverse genotypes were examined to understand the genomic mechanisms of ATTs in drought tolerance. Genome wide association studies identified 43 genetic loci with significant genotype to phenotype association. Among the candidate genes identified, Adenosylmethionine decarboxylase (AdoMetDC) and drought induced 19 protein (Di19), were showed a significant fold change expression. The relevance of AdoMetDC and Di19 was further highlighted by a metabolome analysis in a tolerant genotype, which demonstrated a larger accumulation of polyamines and lower senescence. An integrated phenomics, physiological, and genomic approach allowed us to unravel the genetic control of natural variation in ATTs in 3K panel, and provide a foundation for further studies.en_US
dc.identifier.otherTh-13275
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810191080
dc.keywordsACQUIRED TOLERANCE,TRAITS, CROP IMPROVEMENTen_US
dc.language.isoEnglishen_US
dc.pages240en_US
dc.publisherUniversity of Agricultural Sciences, Bangaloreen_US
dc.subCrop Physiologyen_US
dc.themeIMPORTANCE OF ACQUIRED TOLERANCEen_US
dc.these.typePh.Den_US
dc.titleSTUDYING THE IMPORTANCE OF ACQUIRED TOLERANCE TRAITS TO EXPLOIT THEIR POTENTIAL IN CROP IMPROVEMENT PROGRAMen_US
dc.typeThesisen_US
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