ISO-chromosomes and the origin of triploidy in hybrids between old and new world species of Philadelphus

Janaki Ammal, E. K. (1958) ISO-chromosomes and the origin of triploidy in hybrids between old and new world species of Philadelphus Proceedings of the Indian Academy of Sciences, Section B, 48 (5). pp. 251-258. ISSN 0370-0097

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Official URL: http://www.ias.ac.in/j_archive/procb/48/5/251-258/...

Related URL: http://dx.doi.org/10.1007/BF03050262

Abstract

1. AllPhiladelphus species in nature are diploids 2n=26. 2. The chromosome complement of species examined was found to be fairly uniform in morphology and could be represented by the haploid formulae. 1Lm+8Mst+2Sst+2Ssm3. The L chromosome inPhiladelphus was found to be an iso-chromosome with a weak centromere. 4. While geographical isolation inPhiladelphus has not appreciably affected pairing between the 12 pairs of chromosomes in hybrids, it has a distinct effect on the pairing of iso-chromosomes. 5. Pollen fertility of species and hybrids is related to the behaviour of iso-chromosome. 6. Triploidy in interspecific hybrids is due to the formation of unreduced gametes by non-separation of iso-chromosomes at meiosis.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
ID Code:14893
Deposited On:12 Nov 2010 13:22
Last Modified:16 May 2016 23:52

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