Indian Society of Genetics & Plant Breeding

Cytomorphology of interspecific hybrids between Gossypium hirsutum L., its haploid and Gossypium raimondii

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Interspecific hybrids between G. hlrsutum, its haploid and
G. ralmondll were obtained. Morphological studies of
different characters indicated that flower colour, petal
spot, filament colour, pollen colour, stems, leaf hairiness
etc. of G. ralmondll were found to be dominant In both
the hybrids while other growth characters and habit were
intermediate. Meiosis in G. hlrsutum and G. ralmondll was
normal leading to formation of viable pollen, however, in
haploid and both the hybrids it was abnormal. On an
average chromosome associations at diakinesis and
metaphase-I were 4.11 1 + 4.6911 + 4.17111 and 5.301 + 4.2011
+ 4.10111 and 10.5511 + 10.2711 + 1.13111 + 1.131V and 10.291
+ 10.9911 + 1.39111 + 0.64IV, in diploid (G. hlrsutum haploid
x G. ralmondll) and triploid (G. hlrsutum x G. ralmondll),
hybrids, receptively. Further, 4 to 6 bivalents observed
in hybrid between G. hlrsutum haploid x G. ralmondll
were due to pairing between. Ah 05 chromosome of G.
hlrsutum and G. ralmondJl, respectively and also Ah with
0h and 05 chromosomes. In addition, bivalents formed
in diploid hybrid and trivalent and quadrlvalents In triploid
hybrid due to pairing between non-homologous
chromosomes. Pattern of chromosome pairing indicated
that chromosomes from 05 genome of the G. ralmondll
have closer homology with Ah 0h' chromosomes of G.
hlrsutum. Formnation of multivalents, univalents and
unequal separation of chromosome has resulted in
formation of sporads containing 1-7 spores leading to
formation of sterile pollens with high size variation.
 

Keywords: Cytomorphology. Gossyplum hirsutum, Gossypium raimondii, haploid, interspecific hybrids

Info

Year: 2003
Volume: 63
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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