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Accueil du site → Master → Inde → 2007 → Genetic analysis of shootfly resistance, drought resistance and grain quality component traits in rabi sorghum [sorghum bicolor (l.) moench]

University of Agricultural Sciences, Dharwad (2007)

Genetic analysis of shootfly resistance, drought resistance and grain quality component traits in rabi sorghum [sorghum bicolor (l.) moench]

Keshava Reddy A.

Titre : Genetic analysis of shootfly resistance, drought resistance and grain quality component traits in rabi sorghum [sorghum bicolor (l.) moench]

Auteur : Keshava Reddy A.

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science (MS) in Genetics and Plant Breeding 2007

Résumé
A study was conducted in rabi sorghum to study the genetics of the component traits of shootfly resistance, drought resistance, grain quality and yield. Six generations of a cross CSV216R × B35 (P1, P2, F1, F2, BC1P1 and BC1P2) were evaluated along with six checks at RARS, Bijapur during rabi, 2006. Besides this, a set of 22 rabi genotypes were evaluated for micronutrients in grains. The results revealed that gene actions for components of shootfly resistance such as leaf glossiness, leaf trichome density (upper surface) and leaf trichome density (lower surface) were recessive gene with additive effect, dominance with additive × additive epistasis and recessive with dominance × dominance epistasis, respectively and lower deadhearts (%) being controlled by recessive genes. Drought resistance traits such as stay-green trait and chlorophyll content index at one week after flowering were controlled by dominant and dominance with additive × additive epistasis, respectively. At one week after physiological maturity, these traits were governed by dominance with additive × additive epistasis and dominant gene, respectively. Inheritance of grain quality traits revealed predominance of additive gene action for grain color and endosperm texture, dominance gene action for lustrous seed, thin mesocarp and seed shape. Non-additive gene action played important role in panicle dry weight, days to 50 per cent flowering and grain weight, and additive gene action for plant height, grain number and panicle harvest index. Study of F2 phenotypic segregation showed that leaf glossiness being controlled by major loci with epistasis, inhibitory type of epistasis with two genes for seed luster, dominant gene for thin mesocarp and two genes with supplementary gene interaction observed for pericarp pigmentation. The preliminary evaluation of rabi genotypes for micronutrients in grains showed the existence of genotypic variability for Fe, Zn and Ash content indicating scope for improvement for these traits.

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