CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
The Structural and Numerical Alteratians of Chromosomes in Brassica campestris L
Pulak Mukherjee
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JOURNAL FREE ACCESS

1977 Volume 42 Issue 1 Pages 181-187

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Abstract

Karyomorphological studies of different cultivated strains of three varieties of Brassica campestris L. viz. I) B. campestris var. dichotoma, II) B. campestris var. sarson and III) B. campestris var. toria obtained through the courtesy of State Oil Seed Research Station, Berhampore, West Bengal have been studied. Most of the strains show the normal chromosome number as 2n=20 and 10 bivalents in meiosis but several strains viz. I) B. S. B27, II) Y. S. T9, III) Y. S. 151, IV) Toria T11, V) Toria T81 and one local cultivated strains of toria show the aneuploid number as 2n=18 chromosomes. Such interstrain difference in chromosome number suggests the role of numerical alterations in chromosomes in the evolution of different varieties and strains of B. campestris. Intraspecific variation has been taken to show that difference in chromosome number within difference species should not be regarded as an indication of non-relationship and also confirms the possibility of their origin from a common genome. The role of minute structural alterations of chromosomes has been discussed.

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