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B-chromosomes inIseilema laxumHack. II. Genetics

✍ Scribed by U. R. Murty; D. Satyavathi

Book ID
104626364
Publisher
Springer Netherlands
Year
1972
Tongue
English
Weight
279 KB
Volume
43
Category
Article
ISSN
0016-6707

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✦ Synopsis

Transmission of B-chromosomes to S1 progenies and progenies of crosses involving parents with different numbers of B-chromosomes in Iseilema laxum Hack. is reported. The mean number of B's remained the same in S1 progenies. In the progenies of the crosses, the mean number of B's increased and the range of their number in the offspring also is wider when they are transmitted through the male parent. The inheritance of B's is more or less normal on the female side. The phenomena of nondisjunction and precocious division of B's are more frequent in the male parent. Apart from nondisjunction and precocious divisions in the PMC's, there seems to be some post-meiotic mechanism responsible for the wide range and increase in the mean number of B's in crosses where the male parents contain B-chromosomes.

πŸ“œ SIMILAR VOLUMES

B-chromosomes inIseilema laxumHack. I. C
B-chromosomes inIseilema laxumHack. I. Cytology
✍ U. R. Murty πŸ“‚ Article πŸ“… 1972 πŸ› Springer Netherlands 🌐 English βš– 236 KB

Upto 6 B-chromosomes occurred in natural populations of the fodder grass Iseilema laxum Hack. They were smaller than the A-chromosomes and stained darker. Although the number of B's varied in different PMC's of even the same anther presumably due to the phenomena of nondisjunction and precocious div