Genome relationships between Hordeum procerum (6x) and H. lechleri (6x)

Reddy, M. K. ; Subrahmanyam, N. C. (1985) Genome relationships between Hordeum procerum (6x) and H. lechleri (6x) Genetica, 66 (1). pp. 53-61. ISSN 0016-6707

Full text not available from this repository.

Official URL:

Related URL:


Investigations on the meiotic behaviour of chromosomes in interspecific hybrids (2n=6x=42) between Hordeum lechleri (6x) and H. procerum (6x) and in their component haploids have been utilized to assess the nature of pairing and the extent of genome homology between the two species. In the F1 hybrids an average of 25 (60%) chromosomes associated at metaphase I, mostly as bivalents. A majority (60%) of the pollen mother cells (PMCs) in H. procerum haploids (2n=3x=21) displayed 21 univalents and even in the remainder, a maximum of two rod bivalents were formed resulting in an average of 0.52 bivalents per cell. In haploids of H. lechleri (2n=3x=21) however, 30% of chromosomes pair. The sum of the chromosomal associations in the component haploids represents only 17% of the complement, far below the observed frequency (60%) in the hybrids. Thus, the pairing displayed in hybrids between H. lechleri and H. procerum was mostly allosyndetic and suggestive of two genomes being common in these species. In haploid H. procerum 1/3 of the PMCs displayed a tripolar organisation of chromosomes leading to triad and hexad formation after divisions I and II respectively. The significance of hexad formation in the trihaploid H. procerum and a possible suppression of homoeologous pairing in H. procerum haploids are discussed.

Item Type:Article
Source:Copyright of this article belongs to Springer.
ID Code:53180
Deposited On:05 Aug 2011 07:24
Last Modified:05 Aug 2011 07:24

Repository Staff Only: item control page