Pachytene Pairing and Meiosis in the F1 Hybrid of Pennisetum typhoides and P. purpureum

• Published in: CYTOLOGIA Vol. 32; no. 3-4; pp. 532 - 541
• Main Author: Pantulu, J. V.
• Format: Journal Article
• Language: English
• Published: Tokyo Japan Mendel Society, International Society of Cytology 01.01.1967; Japan Science and Technology Agency
• ISSN: 0011-4545; 1348-7019
• DOI: 10.1508/cytologia.32.532

Pachytene pairing and meiosis in the F1 hybrid of P. typhoides and P. purpureum has been worked out. On the basis of the diagnostic characters of the pachytene chromosomes of the two parents the chromosomes forming pairs in the hybrid were made out. The first five chromosomes of typhoides are homologous with the first five chromosomes of purpureum. The sixth and seventh chromosomes of typhoides are homologous with the eighth and fourteenth of purpureum respectively. Autosyndetic pairing of chromosomes of the “B” genome of purpureum which is in a monoploid condition was observed; this pairing is non-homologous and not associa-ted with chiasma formation. The chiasma frequency in the F1 hybrid is lower than either parent and at metaphase I ring bivalents are never more than two per cell, all the others rod bivalents. There is irregular distribution of chromosomes at anaphase I and II. Laggards and micronuclei were observed.