Effects of terminal heat stress on yield and physiological traits of bread wheat genotypes (Triticum aestivum L.)

Abstract

Wheat is a thermosensitive, long-day crop that is best adapted to temperate climates. Exposure to high temperatures during certain physiological stages of crop growth causes early flowering and shorter grain-filling period, reducing crop duration and ultimately lowering yields. The objective of the study was to evaluate the physiological parameters contributing to heat stress tolerance in bread wheat. The study was carried out using 64 genotypes comprising of six females, eight males and 48 crosses along with two checks under normal and temperature stress conditions. Estimates of mean performances were collected for grain yield per plant, canopy temperature depression, chlorophyll content, proline content, and relative water content.