Indian Society of Genetics & Plant Breeding

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PATTERN OF GENETIC VARIABILITY FOR MORPHOLOGICAL AND PRODUCTIVE TRAITS IN WHEAT GENOTYPES HAVING DIFFERENTIAL PHOTOTHERMO RESPONSE

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Forty wheat (Triticum aestivum) genotypes were classified on the basis of their
photothermal response into five groups. In the high temperature- and photoperiodresponsive genotypes, sowing under high temperature and long days of Oct'lber caused
reduction in number of days to heading, tillers/plant, plant height, spikelets/spike,
grains/spike, and grain yield/plant, but such reduction was not observed in the
photothermo-nonresponsive genotypes. Maximum resolution of variability for tiller
number and plant height was recorded in December sowing among all the genotypes.
However, maximum variability for other traits was expressed differently among genotypes
of different groups in different environments. The genotypes possessing high degree of
thermotolerance may be used by plant breeders in hybridization to develop heat tolerant
strains or may be directly promoted as cultivar.
 

Keywords: Wheat, photothermo-responsive, vernalization, photoperiod, genetic variability.

Info

Year: 1995
Volume: 55
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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