GENE ACTION FOR SEED YIELD AND FIBRE TRAITS IN LINSEED (Linum usitatissimum L.)
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Date
2019-01-05
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CSKHPKV, Palampur
Abstract
The present investigation entitled “Gene action for seed yield and fibre traits in linseed (Linum usitatissimum L.)” was undertaken to detect the presence of non-allelic interactions by understanding nature and magnitude of various genic effects including interactions for seed yield, oil content, fibre yield and associated traits, study the inheritance of powdery mildew and rust diseases, and to identify potential parents and cross combinations on the basis of heterosis in linseed. Eight generations namely, two parents (P1 and P2), F1, F2, BC1, BC2, BC1F2/B1S, BC2F2/B2S were evaluated in compact family block design with three replications for 16 characters in five cross combinations namely, Surbhi × Nagarkot, Baner × Belinka, KL-270 × JRF-1, T-397 × Surbhi and K1-Raja × Nagarkot. The research was carried out in Experimental Farm, Department of Crop Improvement, CSK HPKV, Palampur and research station SAREC Kangra and HAREC Kukumseri during the year 2015-16 to 2017-18.
Generation mean analysis suggested that both additive and dominance effects were important for most of the traits but dominance was predominant as compared to additive effects. Duplicate type of gene action was observed in Surbhi × Nagarkot for four characters namely, primary branches per plant, secondary branches per plant, capsules per plant and 1000-seed weight; Baner × Belinka for four characters namely, plant height, technical height, primary branches per plant and capsules per plant; KL-270 × JRF-1 for four characters namely, plant height, primary branches per plant, secondary branches per plant and capsules per plant. In T-397 × Surbhi, one character i.e. harvest index and K1-Raja × Nagarkot for six characters namely, primary branches per plant, aerial biomass per plant, seed yield per plant, 1000-seed weight, fibre yield per plant and oil content which suggested the exploitation of these crosses by growing large segregating populations and adopting biparental mating to get transgressive segregants. Complementary type of gene action was observed in Surbhi × Nagarkot for plant height; K1-Raja × Nagarkot for secondary branches per plant and Baner × Belinka for both seed yield per plant and fibre yield per plant which implies the use of biparental approach and early generation selection to be followed. Significant positive heterosis over better parent for all the cross combinations were observed for eight characters viz., plant height, primary branches per plant, secondary branches per plant, capsules per plant, seeds per capsule, seed yield per plant, straw weight and retted straw weight. The best heterotic crosses were Baner × Belinka (seed yield) and KL-270 × JRF-1 (fibre yield). Crosses with significant heterosis also showed significant inbreeding depression in F2.
The segregation pattern of rust and powdery mildew indicated that single dominant gene controls the inheritance of these diseases having the ratio of 3:1 in linseed.
The outcome of the present endeavour suggested that for developing the dual purpose variety for seed yield, fibre yield and oil content crosses; Baner × Belinka and KL- 270 × JRF-1 may be exploited through biparental approach followed by recurrent selection. Therefore, promising parents and crosses could be utilized in future breeding programme.
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