Wheat Information Service
Number 98: 16-21 (2004)
Research article

Genetic studies of grain filling period in durum wheat under normal and late sown environments

S. N. Sharma and R. S. Sain

All India Coordinated Wheat and Barley Improvement Project, Rajasthan Agricultural University, Agriculture Research Station, Durgapura, ,Jaipur-302018, Rajasthan, India

Summary

Parental, F₁, F₂, BC₁, BC₂, BC₁₁, BC₁₂, BC₂₁, BC₂₂, BC₁ self and BC₂ self generations of three crosses involving six cultivars of durum wheat (Triticum durum Deaf) were studied for grain filling period under normal and lath sown environments to analyze the nature of gene effects. Six-parameter model in the cross Raj 911 x DWL 5002 in normal sown and 10-parameter model in other crosses under both normal and lath sown plantings were found adequate to explain the inheritance of this trait. Additive (d) and dominance (h) gene effects were frequently observed significant. Of the epistatic interactions, one or the other digenic and for trigenic interactions played significantly greater role in controlling the inheritance of this trait. Non-fixable gene effects were much higher than the fixable gene effects in all the crosses in both the sowing environments. Significant positive heterosis (over better parent) was observed in the crosses Cocorit 71 x A-9-30-1 under both the planting dates and in the cross HI 8062 x JNX-4W-128 in normal planting. The major combined effects of digenic as well as trigenic epistatic interactions attributed the significant heterosis. Significant inbreeding depression was not frequently observed. Biparental mating and/or diaiiel selective mating have been suggested for the improvement of this trait in durum.

Key words: durum wheat, non-allelic interactions, gene effects, epistasis, heterosis

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