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The Journal of Heredity 1979:70(1):73-74
© 1979 The American Genetic Association 70:73-74

other

Secondary associations of univalent chromosomes in haploids and hybrids of Gossypium

IBRAHIM EL JACK MURSAL

Agricultural Research Corporation, Shambat Research Substation, P.O. Box No. 30, Khartoum North, Sudan, Africa

Abstract

Secondary associations at metaphase I were analyzed in five genetically different haploids of the allotetraploid G. hirsutum and in the A2D5 hybrid F1 between G. arboreum (A2) and G. raimondii (D5) Eighty-three percent of the associations were allosyndetic of AD chromosomes while 17 percent of the associations were classified as autosyndetic of AA and DD chromosomes. The end-to-end associations were in excess of the end-to-side and side-to-side and their respective frequencies were 75, 14, and 11 percent. Reasons are given why these associations were nonrandom, specific, and allosyndetic. The excess of the AD and end-to-end associations over the other types is taken as an indication of homology and gives additional support to the homoeology between the A and D genomes.


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