Abstract:
The purpose of this study was to optimise techniques for screening heat tolerant and heat susceptible germplasm by investigating the relationship between leaf physiology and cotton yield. Cotton accessions were subjected to high temperatures by either shifting planting time under the field or exposing plants to the hot room in glasshouse (34/21°C and 45/30°C). Cotton accessions were classified as heat tolerant, medium tolerant, or susceptible based on yield performance. High temperatures had a significant impact on leaf physiology, including relative cell injury (RCI), gas exchange components like net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (E), leaf temperature (LT), chlorophyll fluorescence (Fv/Fm), and seed cotton yield per plant (SCY). This study discovered a significant interaction between accession and environment for leaf physiology and seed cotton yield, implying genetic variability for heat tolerance in tested cotton germplasm. Under hot conditions, there was a strong positive relationship between leaf gas exchange and seed cotton yield, but this relationship was negligible for the tolerant accessions. Based on the performance of RCI, Pn, Gs, E, LT, Fv/Fm, and SCY for these accessions under heat stress conditions, the principal component analysis (PCA) extracted valuable information of 30 cotton accessions as heat tolerant, medium heat tolerant, and heat susceptible
Page(s):
95-95
DOI:
DOI not available
Published:
Journal: Abstract Book on Second International Conference on Recent Approaches in Plant Sciences (RAPS-23) 4-5 May 2023 , Volume: 0, Issue: 0, Year: 2023
Keywords:
genetic variability
,
Cotton
,
Leaf physiology
,
Cotton
,
temperature extreme