Molecular and physiological studies to identify traits enhancing rice cultivars adaptation to aerobic conditions for sustainable rice production in water short situations

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dc.contributor.advisorJain, Rajinder Kumar
dc.contributor.authorSandhu, Nitika
dc.date.accessioned2017-06-03T03:34:25Z
dc.date.available2017-06-03T03:34:25Z
dc.date.issued2013
dc.description.abstractIn the present investigation experiments were conducted to: identify QTL conferring a potential yield advantage under direct seeded conditions; identify root traits having a positive correlation with grain yield under direct seeded conditions; identify genotypes with high levels of root growth plasticity in multiple conditions (upland, lowland, induced by drought or low P) and to identify a positive correlation of root plasticity with grain yield; BSA approach was applied to identify QTL showing consistent effects in the background of two popular high-yielding varieties, IR64 and MTU1010, under upland reproductive-stage drought stress; identify QTL with large and consistent effects for traits thought to be beneficial for direct-seeded rice: seedling emergence, early vegetative vigour, root morphology, nutrient uptake, and grain yield. We hypothesized that the some of the seedling-stage traits investigated might have a strong enough effect on plant growth to be correlated with grain yield at harvest. Our study identified a total of 35 QTL associated with 14 traits on chromosomes 1, 2, 5, 6, 8, 9, and 11 in MASARB25 × Pusa Basmati 1460 population and 14 QTL associated with nine traits on chromosomes 1, 2, 8, 9, 10, 11, and 12 in HKR47 × MAS26-derived population. These identified QTL included three large-effect stable QTL for increased yield under aerobic conditions and QTL for several root-related traits likely to increase water and nutrient uptake under aerobic conditions. A number of plants were identified with higher root length and dry biomass, yield per plant, length-breadth ratio, and with Pusa Basmati 1460 specific alleles in homozygous or heterozygous condition at the BAD2 locus; these lines shall serve as novel materials for the selection of stable aerobic Basmati rice varieties. A good correlation was observed between root growth/plasticity in lysimeter, field and rhizoscope study, between water uptake in lysimeter and leaf water status in field. Consistently high plasticity was observed across different treatment and environment. Three large and consistent-effect QTL, qDTY1.1, qDTY2.2, and qDTY2.3 for GY were identified under reproductive-stage drought stress in Kali Aus/2*MTU1010 and Kali Aus/2*IR64 populations. A total of 28 QTL associated with 22 traits and 20 QTL associated with 12 traits were mapped in Aus276/3*IR64 and Aus276/3*MTU1010 population, respectively. The QTL qGY6.1, qGY10.1, qGY1.1 and qEVV9.1 were found to be effective in both Aus276/3*IR64 and Aus276/3*MTU1010 populations under wide range of conditions; the QTL for nutrient uptake were located on chromosome 5, co-located with qGR5.2 and qRHD5.1. The positive interaction between the genomic regions for root traits and nutrient uptake depicted that these interacting loci should also be considered when introgressing QTL to develop rice for dry direct seeded conditions. Co-localization of QTL for yield, EVV, and root traits indicates that the identified QTL may be immediately exploited in MAB to develop novel high-yielding direct seeded rice varieties.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/5810014388
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subMolecular Biology and Biotechnology
dc.subjectVegetative propagation, Rice, Sowing, Irrigation, Yields, Planting, Land resources, Weather hazards, Biological phenomena, Research methodsen_US
dc.these.typePh.D
dc.titleMolecular and physiological studies to identify traits enhancing rice cultivars adaptation to aerobic conditions for sustainable rice production in water short situationsen_US
dc.typeThesisen_US
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