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Chapter 5,875

Meiotic studies in the ha ploids 2n equals 2 x equals 26 of the tetra ploid cottons 2n equals 4 x equals 52

Mehetre, S.S.; Thombre, M.V.

Proceedings of the Indian National Science Academy Part B Biological Sciences 47(4): 516-518

1981

Accession: 005874120
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Meiosis and pollen formation were studied in the 2 haploid (2n = 2x = 26) plants of tetraploid (2n = 4x = 52) G. hirsutum and G. barbadense cottons. Varying degrees of bivalents and chiasma per bivalent were observed in 1st meiotic division. The number of microspores varied in different PMC [pollen mother cell]. The range was 1-8/PMC. The pollen formed were variable in size. Average size was 66.05 and 51.31 .mu. in haploids as compared to 122.30 and 120.20 .mu. in normal tetraploids of G. hirsutum and G. barbadense, respectively. The formation of normal bivalents was attributed to the intergenomic homology.

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