Indian Society of Genetics & Plant Breeding

Inheritance of stem fasciation and twin/multi-embryonic seeds and genetic linkage between them in safflower

Published on

The derivatives of an interspecific cross between
Carthamus palaestinus (wild species) X Carthamus
tinctorius (cultivated species) showed exomorphic
variations such as plants with flattened stems having a
fasciated main capitulum forming a semi- circular structure
of two to three capitula fused together. The other capitula
of the fasciated plants were normal. Apart from the stem
fasciation, these derivatives also produced twin/multiembryo seeds. The objective of the present study was to
find the mode of inheritance, the number of genes
controlling stem fasciation and twin/multi-embryo seeds
and linkage between the genes controlling the two traits.
The results of the crosses made between fasciated
derivatives and the normal genotypes revealed that F1s
of all the crosses gave plants with normal stem and single
embryo-seeds. The F2 segregation gave a ratio of 13:3 for
plants with normal and fasciated stems respectively as
also for plants with single-embryo seeds and twin/multiembryo seeds respectively. The F3 generation segregations
further support the role of inhibitory gene action in the
control of stem fasciation and twin/multi-embryo seeds
in safflower. The stem fasciation and twin/multi-embryo
seeds are designated by the gene symbols FpFp and FsFs
respectively. The genic analysis exhibited close linkage
between F
pFp and FsFs genes in coupling phase. Linkage
between the genes for stem fasciation and twin/multiembryo seeds is reported for the first time and its
usefulness in identification of probable apomicts in
safflower is discussed in the paper.

Keywords: Safflower, linkage, fasciated stem, twin/ multiple-embryo seeds, gene action, Carthamus tinctorius


Year: 2010
Volume: 70
Issue: 3
Article DOI: N/A
Print ISSN: 0019-5200
Online ISSN: 0975-6906



Download PDF