Indian Journal of Genetics and Plant Breeding (The)
Year : 1981, Volume : 41, Issue : 3
First page : ( 368) Last page : ( 373)
Print ISSN : 0019-5200. Online ISSN : 0975-6906.

Inbreeding Depression in Rapeseed

Doloi P. C.1, Rai B.²

Department of Plant Breeding, G. B. Pant University of Agriculture and Technology, Pantnagar (Nainital) U.P., 263 145, India

²Department of Plant Breeding and Genetics, Rajendra Agricultural University, Dholi Campus, Bihar-843 121.

¹Present address: Regional Agricultural Research Station, Shillongani, Nowgong, Assam-782 001.

Abstract

Inbreeding depression in 9 elite rapeseed cultures for yield, yield components and oil content under different forms of selfing was studied. The self-incompatible group of cultures showed inbreeding depression for all the characters except days to maturity and oil content either in S₁ or S₂ or in both. This was not the case with the self-compatible group. The cumulative effect of depression was observed to be more in S₂ but the relative quantum of depression was more in S₁ than in S₂ generation. This was more true for seed yield which was reflected primarily as a consequence of the simultaneous depression in the characters, number of siliquae per plant, number of primary branches and number of secondary branches. The nature of inbreeding depression in the geitonogamical generation (G₁) was comparable with that in the S₁ generation. Sib-mating was a milder form of inbreeding.

Top