ISSN:
1573-5060
Keywords:
Brassica napus
;
doubled haploid
;
inheritance
;
seed colour
;
vernalization
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Doubled haploid (DH) and F2 populations were used to study the inheritance of seed colour and one DH population was used to study vernalization requirement in Brassica napus. Seed colour was primarily determined by the maternal genotype, but effects of the paternal parent were obvious in a reciprocal F2. The seed colour distributions in the populations fit a trigenic ratio with black seed colour being dominant over yellow seed colour. In the proposed model, which was supported by segregation ratios in an F2 population from a cross with a black-seeded maternal parent (but not its reciprocal) and segregation ratios in 4 DH populations, black seeds were formed when the A gene was homozygous dominant and at least one dominant allele was present at the B locus, brown seeds developed when one or more recessive alleles were present at the A locus and one (or more) dominant alleles was (were) present at any of the three loci and yellow seeds occurred when all three loci were homozygous recessive. The vernalization study showed that the spring habit was dominant to the winter habit and that the requirement for vernalization was controlled by a major and a minor gene. The enhanced resolution of genetic classes afforded by the use of DHs allowed the relative effects of the major and minor vernalization genes to be determined. In the proposed model the major gene was sufficient to allow nonvernalized plants to flower in 62 days or less, the minor gene allowed nonvernalized plants to flower in 63 to 77 days and double recessive genotypes required more than 77 days to flower without vernalization.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00033770
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