Indian Society of Genetics & Plant Breeding

Genotypic variation for agro-physiological traits and their utilization as screening indices for drought tolerance in wheat

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Plants of 56 genotypes of bread wheat (Triticum aestivum
L.) were grown under irrigated and droughted conditions
under field conditions at CCS Haryana Agricultural
University, Hisar, India. Leaf water status, canopy
temperature depression and gas exchange were measured
in the flag leaf at anthesis and yield-attributes and yield
were recorded at harvest. The results revealed that there
was a significant genotypic variation for all traits. Seed
yield was positively correlated with yield attributes but a
stronger relationship was observed with biomass. Drought
susceptibility index (DSI) of genotypes matched for
biomass and seed yield. Significant correlations were
found among agro-physiological traits. Genotypes with
higher soil moisture use from deeper layers (90-180 mm)
maintained higher leaf relative water content (RWC),
transpiration rate (E), photosynthetic rate (PN) and cooler
canopy (higher canopy temperature depression, CTD).
Agro-physiological traits such as soil moisture use (90-
180 mm), RWC, PN and CTD were strongly correlated with
seed yield. Since CTD is easier to measure than other
characters, therefore, CTD measured at midday at the
anthesis stage could be used as selection indices to
screen large number of germplasm lines of wheat for
drought tolerance under field conditions.

Keywords: Canopy temperature depression, drought susceptibility index, drought tolerance, relative water content, wheat


Year: 2010
Volume: 70
Issue: 1
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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