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A.R. NIRMAL KUMAR*, C. VIJAYALAKSHMI AND D. VIJAYALAKSHMI
Department of Crop Physiology, TNAU, Coimbatore, TN 641 003
The effect of short term natural high temperatures above 35oC and drought in the range of – 50 to – 70 kPa was assessed on grain quality parameters in three rice cultivars (ADT 43, TKM 9 and N 22). Drought stress coupled with natural high temperature was imposed at two critical phenophases i.e., at panicle initiation (PI) and anthesis stages under rain out shelter facility. Rice quality is determined both genetically and environmentally where, heat and drought stress caused reduction in quality characters like, Head Rice Recovery (HRR) and amylose content. The HRR was reduced when it is subjected to combined heat and drought stress whereas, broken rice was significantly increased. N 22 produced the grains with high amylose content whereas, susceptible genotype ADT 43 recorded lowest amylose content.
KEYWORDS:
Amylose, Drought, Heat, Oryza sativa, quality