Screening Rice Varieties For Reproductive Stage Salinity Tolerance
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Date
2015-07-06
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ANDUAT,KUMARGANJ,AYODHYA
Abstract
Rice is a sensitive crop to salinity stress. Salinity has been the single largest factor limiting the
rice yield. Developing rice cultivars with salinity tolerance is the most efficient way to solve this
problem, because salinity tolerance in rice varies with the growth stage, with vegetative and
reproductive stages being most sensitive. Due to its genetic complexity and physiology of
salinity tolerance in rice it is probably the most difficult trait to improve through conventional
breeding. Application of molecular techniques along with conventional approach is the only
option for improvement of salinity stress. The present study was under taken with the objectives
(i) to screen rice varieties in field conditions for salinity tolerance, (ii) to evaluate rice varieties
in controlled condition (iii) to analyze the rice varieties with molecular markers and (iv) to
identify novel protein band with SDS-PAGE in rice varieties for salinity tolerance. The
experiment was conducted in RBD with three replications in two sets one for salinity stress and
other under control condition. Observation were recorded on days to 50% flowering, plant
height, panicles bearing tillers per plant, flag leaf area(cm), number of spikelets per panicle,
number of grains per panicle, spikelet fertility (%), test weight (%) biological yield per plant
(g), harvest index (%), Na content, K content, Na/K ratio and grain yield (g). Varietal screening
under salinity and conditions at vegetative stage revealed that NDRK 5012 was recorded as
tolerant, other eight varieties were moderately tolerant.
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