Cytomorphological studies of a spontaneous triploid in Pennisetum hohenackeri Hochst. ex Steud

Rao, Y S and Mengesha, M H and Rao, S A (1989) Cytomorphological studies of a spontaneous triploid in Pennisetum hohenackeri Hochst. ex Steud. Genome, 32 (3). pp. 404-407. ISSN 0831-2796

PDF - Published Version Restricted to ICRISAT users only Download (417kB) | Request a copy

Abstract

During studies on the genomic relationships of the wild species of the genus Pennisetum, one spontaneous triploid (3x = 27) plant was identified among the diploid cytotypes (2n = 18) of Pennisetum hohenackeri Hochst. ex Steud. The triploid plant resembled the diploid in most morphological characters, except for the reduced number of spikelets. Chromosome associations of 9 II + 9 I were observed at diakinesis and metaphase I. The bivalents divided normally, while the univalents lagged and formed a separate nucleus, which was included in one of the daughter cells. On the basis of these studies, this plant was considered to be an allotriploid and might have originated as a spontaneous hybrid between diploid P. hohenackeri and an unknown tetraploid (amphidiploid) taxon with one of its genomes homologous to that of diploid P. hohenackeri. The possible donor of this genome could be P. orientale, which is a tetraploid with a basic chromosome number of x = 9.Key words: allotriploid, meiosis, diakinesis, univalents, micronuclei, laggards

Item Type:	Article
Divisions:	UNSPECIFIED
CRP:	UNSPECIFIED
Uncontrolled Keywords:	allotriploid, meiosis, diakinesis, univalents, micronuclei, laggards.
Subjects:	Others > Genetics and Genomics
Depositing User:	Mr B K Murthy
Date Deposited:	31 May 2014 06:25
Last Modified:	31 May 2014 06:25
URI:	http://oar.icrisat.org/id/eprint/8068
Official URL:	http://www.nrcresearchpress.com/doi/abs/10.1139/g8...
Projects:	UNSPECIFIED
Funders:	UNSPECIFIED
Acknowledgement:	The authors thank the Punjab 'Agricultural University, Ludhiana, for supplying us with the wild species and Mr. C. Rajagopal Reddy, ICRISAT, for his assistance in taking care of the wild species. The authors also thank Dr. J, M. J. de Wet, Dr. J. P. Moss, and Dr. A. K. Singh of ICRISAT and Dr. V. Manga, Botany Department, Andhra University, Waltair, for their helpful comments on the manuscript.
Links:	Google Scholar

View Statistics

Actions (login required)

View Item