Determine Physiological Traits Associated with Flowering Stage Drought Tolerance in Lowland Rice (Oryza sativa L.) Genotypes
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Date
2017
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International Journal of Current Microbiology and Applied Sciences
Abstract
Drought stress significantly reduced the RWC and LWP of the rice plant. Moreover,
Azucena (DT check), NDR-359, NDR-97, DSU-18-6, Vandana, TN-1 and Moroberekan
showed less depression. Result revealed that capacity to maintain high LWP is promising
traits for selection to improve tolerance against flowering stage drought tolerance. Grain
yield under water deficit at the flowering stage is negatively correlated with spikelet
sterility and later associated with genotypic variation in maintenance of LWP. Correlation
studies between RWC and per cent grain sterility and LWP vs. per cent sterility indicated
that maintenance of RWC is necessary but not significant to ensure good yield. These
result suggested that other feature are at least as important as RWC in determining
response to flowering stage drought tolerance. Grain yield is well correlated with RL and
RWD but strong regression coefficient was obtained between root length and RWC. This
result indicated that root length did not contribute directly grain yield under drought at
flowering stage. But, it indirectly helps to maintained higher plant water status. Assimilate
accumulate prior to flowering are of permanent importance when plant experience drought
stress at flowering stage. Present study indicated that translocation of soluble sugar for
grain growth is supported by ACR and ATR was higher in stress. Grain yield was
significantly correlated with ACR and ATR.
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