Indian Society of Genetics & Plant Breeding

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Grain growth rate and heat susceptibility index: breeding genotypes tolerant to terminal in bread wheat (Triticum aestivum L)

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High temperature stress has an adverse effect on wheat
productivity. To generate information on the effect of high
temperature on various morpho-physiological yield
attributes, which would help in developing high temperature
stress tolerant genotypes, an experiment was conducted
on a set of 15 diverse cultivars, recommended for different
sowing conditions. The experiment was planted on three
sowing dates to subject the material to different
temperature regimes in the cropping period. The results
revealed that early maturing genotypes like HD2285,
HD2307, Sonalika UP2338, Lok1 and C306, showed better
performance under high temperature stress conditions
with less reduction in grain yield and have relatively
higher grain growth rates with more tolerance to heat
stress for most of the yield attributing characters (low
HSI values). The characters GGR and HSI could be taken
as Important criteria for breeding genotypes acclimatised
to late planting conditions.
 

Keywords: Wheat, grain growth rate (GGR), heat susceptibility index (HSI), high temperature stress.

Info

Year: 2001
Volume: 61
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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