Author(s): M. P. RAGHUNATH, R. BEENA, V. MOHAN, M. M. VIJI, R. V. MANJU AND ROY STEPHEN

Abstract: A two years (years?) experiment was conducted to make certain the effects of exogenously applied plant growth regulators (PGR), nutrients and pink-pigmented facultative methylotrophs on rice growth and yield attributes under high day temperature (HDT). Rice variety Uma (MO-16) was subjected to HDT in controlled polyhouse and ambient temperature with ten different treatments were applied as foliar spray at three stages viz., panicle initiation, heading and flowering stage. Physiological observations were taken at 50% flowering stage and yield parameters were taken at harvest stage. There was significant variation for physiological, biochemical, morphological and yield components among the treatments. Exogenous application of PGRs was helpful in alleviating the adverse effects of high temperature. Brassinosteroid treatment recorded high pollen viability, spikelet fertility and grain yield plant^-1 by improving the physiological traits such as cell membrane stability index (CMSI), photosynthetic rate (Pn), stomatal conductance (Gs), Fv/Fm ratio, chlorophyll stability index (CSI). These results will be of importance for further understanding the adaptation and survival mechanisms of rice to high temperature.

DOI: 10.22271/09746315.2021.v17.i1.1404

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