Indian Society of Genetics & Plant Breeding

Inheritance studies of self-incompatibility in low chill requiring genotypes of cabbage (Brassica oleracea L var. capitata) for boltized flowering

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The commercial cultivars of cabbage being grown in
our country are of temperate type requiring chilling
treatment after head formation for a period ranging from
6-8 weeks for bolting, flowering and seed setting. It is
possible in high hills only, where the cabbage seed crop
takes two seasons being biennial. To tide over this
problem, tropical genotypes have been developed during
the last over two decades so that seed crop may be
raised in lower hills also. In CSKHPKV also, mild chill
requiring genotypes of cabbage have been developed
during the last over one decade through hybridization
of tropical genotypes, capable of producing compact
heads under relatively higher temperature, with the most
popular temperate cultivar ‘Golden Acre’ and good seed
crop is possible in about 8-9 months period. As in other
cole crops, cabbage favours cross-fertilization by means
of self-incompatibility system. This genetic phenomenon
be used to facilitate the cross fertilization required for
hybrid seed production in Brassica was first suggested
by Pearson [2]. Subsequently, studies on the
practicability of F1hybrid seed production by making use
of self-incompatibility have been made in cabbage [3],
Brussel sprouts [4] and Kale [5]. The production of F1
hybrids using incompatibility system, depends on
crossing inbred lines, each homozygous for a different
incompatibility allele. Four types of S-alleles interaction
have been reported in Brassica [1, 6]. Inheritance pattern
were studied in the progenies of eight self-incompatible
plants belonging to five genotypes of cabbage. The
progenies of the self-incompatible plants viz., KGAT-I-
29, KGAT-I-10, KGAT-II-12, KGAT-III-5 and Golden Acre
2 segregated as per the single S-locus inheritance. The
results revealed type III S-allele interaction in progeny
1 (KGAT-I-29), type II S-allele interaction in progeny 2
(KGAT-I-10) and progeny 3 (KGAT-II-12), type IV S-allele
interaction in progeny 4 (KGAT-III-5) and type IS-allele
interaction in progeny 7 (Golden Acre-2). However, the
self-incompatible progenies of KGAT-III-20 and KGATIII-22 could not be categorized as per S-locus
inheritance, most probably due to the presence of weak
S-alleles in these progenies.

Keywords: N/A


Year: 2008
Volume: 68
Issue: 2
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906


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