Indian Society of Genetics & Plant Breeding

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GENETIC ARCHITECTURE OF SOME PHYSIOLOGICAL TRAITS IN WHEAT

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A triple test cross involving 15 diverse lines of bread wheat.(Triticum aestivum L.
em Theil) was studied to investigate the genetic architecture of physiological traits
viz., flag-leaf area (em2), peduncle length (em), stomata number, coleoptile length
(em) and grain filling period. Non-allelic interaction was found to be an integral
component of the genetic architecture of all the traits except flag-leaf area. Partitioning
of non-allelic interaction revealed the influence of additive x dominance (j) and
dominance x dominance (1) interaction in the inheritance of peduncle length,
coleoptile length and grain filling period, whereas additive x additive interaction
was important for stomata number. Both additive and dominance genetic variances
were present for all the traits except peduncle length for which only additive genetic
variance was present. The direction of dominance was ambidirectional for stomata
number and coleoptile length; dominance of increasing alleles for flag-leaf area and
dominance of decreasing alleles for peduncle length and grain filling period. Selection
in early segregating generations for stomata number and in later generations for
remaining traits is expected to be more effective.
 

Keywords: Bread wheat, triple test cross, non-allelic interaction, physiological traits

Info

Year: 1999
Volume: 59
Issue: 2
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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