GENETIC ANALYSIS IN VARIOUS GENOTYPES OF BREAD WHEAT UNDER NORMAL AND HEAT-STRESS ENVIRONMENTS

Raza Ali Rind; Shabana Memon; Wajid Ali Jatoi; Aijaz Ahmed Soomro

doi:10.34016/pjbt.2023.20.02.817

Authors

Raza Ali Rind Department of Plant Breeding and Genetics, Sindh Agriculture University, Tandojam, Sindh
Shabana Memon Department of Plant Breeding and Genetics, Sindh Agriculture University, Tandojam, Sindh https://orcid.org/0000-0002-1710-7280
Wajid Ali Jatoi Department of Plant Breeding and Genetics, Sindh Agriculture University, Tandojam, Sindh
Aijaz Ahmed Soomro Department of Agronomy, Sindh Agriculture University, Tandojam, Sindh, Pakistan

DOI:

https://doi.org/10.34016/pjbt.2023.20.02.817

Keywords:

Heat stress, wheat, morphological character, stomatal conductance, grain yield plant-1

Abstract

Abiotic stresses have brought the crops to a destructive position towards yield production of crops, especially wheat. The present study was investigated to compare the relationship between normal and heat stress conditions under two different sowing dates viz. normal and late sowing dates (25^th Nov and 25^th Dec). The correlation coefficients varied with both sowing dates (normal and late planting). In normal planting number of grains showed a significant positive correlation with grain weight spike^-1 (r = 0.618**), grain yield plant^-1 (r = 0.591**), seed index (r =0 .456**), biological yield plant^-1 (r = 0.540**) and harvest index (r =0 .667**). Grains spike^-1 contributed significant positive correlation with grains spike^-1 (r=0.094**), grain yield plant^-1 (r=0.844**), biological yield plant^-1 (r=0.936**), harvest index (r=0.556**), leaf area (r=0.791**), relative water content (r=0.763**), chlorophyll content (r=0.853**), cell membrane stability (r=0.828**) and stomatal conductance (r=0.292**). Grain yield plant^-1 exhibited a significant positive correlation under normal planting with the number of tillers plant^-1, number of spikelets spike^-1, grains spike^-1, and grain weight spike^-1(r=0.695**,0.207*,0.591**and 0.950**), respectively. Whereas, late planting declared grains spike^-1 revelaed signficant positive correlation with grains spike^-1 (r=0.094**), grain yield plant^-1 (r=0.844**), biological yield plant-1 (r=0.936**), harvest index (r=0.556**), leaf area (r=0.791**),relative water content (r=0.763**), chlorophyll content (r=0.853**), cell membrane stability (r=0.828**) and stolatal conductance (r=0.292**). Under late planting, Yield showed a significant positive correlation with spike length, grains spike^-1, and grain weight spike^-1 (r=0.343**,0.844**, and 0.964**), respectively

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