HETEROSIS AND INBREEDING DEPRESSION STUDIES FOR GRAIN YIELD AND RELATED TRAITS IN BARLEY (Hordeum vulgare L.) UNDER EARLY AND TIMELY SOWN CONDITIONS

CHHAGAN LAL¹*, A.S. SHEKHAWAT², S.S. RAJPUT³, JOGENDRA SINGH^4
1Division of Plant Breeding and Genetics, Rajasthan Agricultural Research Institute, S.K.N. Agriculture University, Durgapura, Jaipur, Rajasthan, 302 018, India
²Division of Plant Breeding and Genetics, Rajasthan Agricultural Research Institute, S.K.N. Agriculture University, Durgapura, Jaipur, Rajasthan, 302 018, India
³Division of Plant Breeding and Genetics, Rajasthan Agricultural Research Institute, S.K.N. Agriculture University, Durgapura, Jaipur, Rajasthan, 302 018, India
⁴Division of Plant Breeding and Genetics, Rajasthan Agricultural Research Institute, S.K.N. Agriculture University, Durgapura, Jaipur, Rajasthan, 302 018, India
* Corresponding Author : chhagangpb123@yahoo.com

Received : 03-08-2018     Accepted : 11-08-2018     Published : 15-08-2018
Volume : 10     Issue : 15       Pages : 6886 - 6889
Int J Agr Sci 10.15 (2018):6886-6889

Keywords : Heterosis, Inbreeding depression, Barley, Grain yield, Timely sown
Academic Editor : Parihar A. K., Dr Prakash Chand Yadav
Conflict of Interest : None declared
Acknowledgements/Funding : Author thankful to Rajasthan Agricultural Research Institute, S.K.N. Agriculture University, Durgapura, Jaipur, Rajasthan, 302 018, India and AICRP on Wheat & Barley, Rajasthan Agricultural Research Institute, S.K.N. Agriculture University, Durgapura, Jaipur, Rajasthan, 302 018, India for providing experimental materials and financial assistance during research work.
Author Contribution : All author equally contributed

Heterosis for grain yield per plant ranged from -20.75 (RD 2715 × RD 2552) to 41.86 per cent (BHS 400 × BH 959) and -21.95 (BHS 400 × BH 902) to 39.65 per cent (BHS 400 × BHS 380) under early and timely sown conditions, respectively. Out of 45 crosses, nine and fifteen crosses exhibited positive significant heterosis in early and timely sown conditions, respectively; while, seven and nine crosses exhibited positive significant heterobeltiosis in early and timely sown conditions, respectively. Negative significant inbreeding depression for grain yield per plant was reported during study which indicated that F2 plants attained comparatively higher grain yield per plant than F1 hybrids and considered to be desirable. In both the early and timely sown conditions, the crosses BG 105 x PL 426, PL 426 × RD 2552 and BH 959 x RD 2786 exhibited positive significant heterosis and heterobeltiosis as well as negative significant inbreeding depression. Hence, these crosses were considered to be most desirable for grain yield per plant. Accordingly, these cross combinations may be utilized for improving grain yield as well as production of better transgressive segregants in advance generations for maintain of specific gene pool of barley through breeding program in future.

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