Indian Society of Genetics & Plant Breeding

Genotypic response for stomatal conductance due to terminal heat stress under late sown condition in wheat (Triticum aestivum L.)

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Stomatal conductance (SC) was evaluated for thirty-six
wheat (Triticum aestivum L.) genotypes sown during 2013-
14 and 2014-15 under two dates of sowing. Steady state
SC-1 leaf porometer was used to record SC on adaxial leaf
surface at late boot (Z 49-50), early milk (Z 73) and late milk
(Z 77) growth stages. In late sown conditions, the
temperature was high (25.7 to 30.3°C) in boot stage itself
and further increased during later stages (32 to 37.4°C).
Under these conditions, the genotypes need to maintain
an optimum range of stomatal conductance to maintain
transpirational cooling without losing too much of water
through transpiration. Heat susceptibility index ranged from
0.27 to 1.54 indicating levels of stress tolerance among the
genotypes. Heat tolerant genotypes maintained relatively
higher SC under heat stress over normal condition.
Significant association between high SC with CT and grain
yield was observed in all the three growth stages. The study
was useful in detailed evaluation of SC and identification
of genotypes with stable SC under heat stress. Genotypes
KAUZ/AA//KAUZ, BERKUT and RAC 875, maintained high
SC over the growth stages. Indian genotypes HD 2932, HD
2987, FLW-18, HW 2004 and RAJ 3765 were equally potential.

Keywords: Adaxial, conductance, genotypes, heat, stomatal


Year: 2016
Volume: 76
Issue: 3
Article DOI: 10.5958/0975-6906.2016.00040.7
Print ISSN: 0019-5200
Online ISSN: 0975-6906


N. Jain info_circle
B. Amasiddha info_circle
P. K. Singh info_circle
A. Arora info_circle
G. P. Singh info_circle
K. V. Prabhu info_circle

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