Genetical studies of chlorophyll deficient lethal seedling were undertaken in two
G. hirsutum progenies, viz., N-3-19-18-3-5-7-1-20 and N-3-19-27-7-12-1-27. Digenic
segregation in the ratio of 15:1 for nonnal green and pale yellow lethal se~dlings
indicated that the lethal trait was controlled by duplicate recessive genes. In F2
populations of five interspecific crosses, similar segregational pattern was observed.
In the G. hirsutum progeny N-3-19-27-7-12-1-27 cinus colour (red vs. green) was
controlled by the dominant genes segregating in the ratio of 11 red: 5 green, while
in F2 populations obtained from interspecific cross 188-26-7-3- x 21-4-4, this character
segregated in the ratio of 13 red: 3 green, showing inhibitory action of genes.
Hypocotyle colour (red vs. green) was caused by two dominant genes behaving in
complementary manner (7:9) in the G. hirsutum progeny, while it showed duplicate
epistasis with segregation ratio of 15 red: 1 green in F2 population derived from
G. hirsutum x G. hirsutum cross. The loci controlling nonnal vs. pale yellow lethal
seedlings, cinus and hypocotyle (red vs. green) were found to be linked. The
crossover values estimated to be 18.92% between genes for seedling colour and
cinus colour, 34.07% between genes for seedling colour and hypocotyle colour, and
29.06% between loci for cinus and hypocotyle colour.
Keywords: Cotton, lethality, cinus, hypocotyle, segregation, genes, inheritance, linkage, yellow seedlings.
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
MUNSHI SINGH, R. P. SINGH AND V. P. SINGH info_circle