Application of potassium iodide as a new agent for screening of drought tolerance upland rice genotypes at flowering stage

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Plant Knowledge Journal
Selection of appropriate physiological criteria is still an impediment for the breeding of drought tolerant rice varieties. An experiment was conducted to analyze the effect of potassium iodide (KI) for it’s suitability as a selection criterion to screen upland rice genotypes. Three different KI concentrations vis. 0.25%, 0.50% and 0.75% were applied on eight rice genotypes comprising four tolerant and four susceptible ones. Injuries in young tissues, reduction in yield, panicle length, panicle weight, grain number and grain weight were observed at the KI concentrations of 0.50 and 0.75%. However, 0.25% KI concentration did not showed significant injury effects on rice genotypes. The significant correlation of grain yield with apparent translocation rate (R2 = 0.54) was also observed, indicating reduction in current assimilation during reproductive stage, under different KI treatments and tolerant rice genotypes induced an increase in stem reserve mobilization. SDS-PAGE profiling of KI treated rice leaves induced novel protein bands of 30 kDa, 50 kDa and 70 kDa in tolerant rice genotypes. The present study concluded that KI can be used as chemical desiccant for the screening of drought tolerant upland rice varieties at reproductive stage.