Wheat genotypes screening for high temperature tolerance under late sowing conditions

Abstract

High temperature especially effects terminal end of inflorescence during anthesis and grain fillingperiodthus significantly reducingquality and yield of wheat. The maincomplication with late sownwheat is high temperature duringreproductionprocess that effects thegrain yield.So the present study wasplanned to screen four wheat genotypeswith twocheck varieties for high temperature tolerance. The studywas laid out at experimental Farm of NIA, Tandojam during 2011-12. The minimum, maximum temperatures and humidity were recordedduring the experiment.Grain yield and associated traitsin genotypesof wheatsignificantly decreased under latesowing. About 15.8%and 14.0% reduction was measured indays to heading and maturity,respectively in late-sown trial. Morphological traits viz., plant height, spike length, spikelets per spike, grains/spike, 1000-grain weight, biological weight and grain yield/plant also decreased by 9.4, 17.4, 11.2, 11.4, 20.4, 62.2 and 54.8%, respectivelyunder late sowingas compared to normal sowing.The late sowing showed leasteffect on MSH-36 and Sarsabzin comparison to other genotypes. Maximum 1000-grain weight (43.0 g) was obtained under MSH-36 and bold seeds in MSH-3 and NIA-8/7. Maturity period of the wheat also decreased (16.8%)underlate sown wheat.So, the genotypes MSH-36and Sarsabz were found superior to cultivate under late sowing and MSH-3 and NIA-8/7 under normal sowing conditions