Nucleolar variation in a pigeon pea intergeneric hybrid: evidence for allosyndetic recombination

Kumar, P S and Subrahmanyam, N C and Faris, D G (1984) Nucleolar variation in a pigeon pea intergeneric hybrid: evidence for allosyndetic recombination. Canadian Journal of Genetics and Cytology, 26 (5). pp. 499-505. ISSN 0008-4093

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Abstract

Cytological study of a hybrid between Cajanus cajan and Atylosia albicans revealed regular bivalent formation and disjunction. Nevertheless, high pollen sterility and low seed set were evident. An examination of pollen mother cells revealed variation in nucleolar number at telophase-I (four to eight) and at telophase-II (zero to four in daughter nuclei), although each genome contained two nucleolar organizers. Variation was also recorded for nucleolar size and distribution at telophase-II. Variation in nucleolar number and distribution are interpreted to have originated from pairing and recombination between nucleolar organizer chromosome(s) of one parental species with the nonnucleolar organizer chromosome(s) of the other. Size variation is attributed to nucleolar dominance. These results explain the high degree of pollen sterility in the hybrid in spite of normal meiosis, and also suggest that the karyotypes of C. cajan and A. albicans have differentiated through structural heterozygosity.

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	Cajanus cajan; Atylosia albicans; Nucleolar Variation; Structural Heterozygosity; Allosyndetic Recombination
Subjects:	Mandate crops > Pigeonpea
Depositing User:	Mr B K Murthy
Date Deposited:	30 Jul 2014 10:32
Last Modified:	30 Jul 2014 10:32
URI:	http://oar.icrisat.org/id/eprint/8246
Official URL:	http://www.nrcresearchpress.com/doi/abs/10.1139/g8...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	UNSPECIFIED
Links:	Google Scholar

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