Assessing field and polytunnel based methods for screening wheat genotypes under terminal heat stress
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
Heat stress is one of major abiotic factor which limits the production and productivity of
wheat (Triticum asetivum L.) in different areas of world. In first part of our study, two sets of
wheat genotypes were raised under different growth conditions viz. timely sown and late
sown. In second part of our study sets of genotypes were grown raised in pots under
polytunnel conditions viz stress with aeration, normal, stress without aeration. The
experiment was laid out in a random design and complete random design with three
replication under different growing conditions at different temperature conditions. Result of
various morphological and physiological parameters showed significant difference and yield
related parameters indicated that heat stress at grain filling in late sown environment caused
reduction in yield as 18.19% in set I and 29.90% in set II under field conditions. Under
controlled stress condition (aeration) 13.81 % reduction in yield was recorded as compared to
normal. Correlation analysis between various parameters showed that yield is highly
correlated with grains per spike and seed in central floret. The results suggest that these
physiological traits may used as secondary traits for determining. Genotypes BWL 5202,
PBW 658, PBW 725 are tolerant varieties under field and polytunnel conditions.
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