✦ LIBER ✦
Suppression of multivalent formation by B chromosomes in natural and artificial autopolyploids of scurvy-grass (CochleariaL.)
✍ Scribed by P. P. Gupta
- Book ID
- 104691994
- Publisher
- Springer
- Year
- 1981
- Tongue
- English
- Weight
- 271 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0040-5752
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✦ Synopsis
In diploid Cochlearia pyrenaica, its established natural autotetraploid C. officinalis, and their newly induced autotetraploid and auto-octoploid derivatives, B chromosomes change the normal pattern of chromosome association by suppressing homologous pairing. Frequency of bivalents increases at the expense of multivalents from lower to higher numbers of B chromosomes. The reduction of multivalents due to the direct influence of the B chromosomes, independent of pollen mother cell chiasma frequency, is suggested as being related to the mechanism that prevents A/B chromosome pairing.