Meiotic pairing control in wheat–rye hybrids. I. Effect of different wheat chromosome arms of homoeologous groups 3 and 5

Abstract

CUADRADO, C., ROMERO, C., and LACADENA, J. R. 1991. Meiotic pairing control in wheat-rye hybrids. I. Effect of different wheat chromosome arms of homoeologous groups 3 and 5. Genome, 34: 72-75. Wheat-rye hybrids were analyzed to study how the homoeologous-pairing control of wheat is altered when specific regulators of groups 3 and 5 are lacking or mutated. Lack of the 3DS chromosome arm and theph2b mutation showed the most significant effect, due to a deficiency or inactivity of the Ph2 suppressor. The 3DL, 5AS, and 5BS chromosome arms have a promoting effect, 5BS being the most effective. A weak suppressive effect of 3AS and 3AL is proposed, and a promotive effect of 5DS was not ruled out. The suppressive effect of 3BS is discussed. . CUADRADO, C., ROMERO, C., et LACADENA, J. R. 1991. Meiotic pairing control in wheat-rye hybrids. I. Effect of different wheat chromosome arms of homoeologous groups 3 and 5. Genome, 34 : 72-75. Des hybrides ble-seigle ont ete analyses pour etudier comment le contrale de l'appariement des chromosomes homeologues du ble est altere, lorsque des regulateurs specifiques des groupes 3 et 5 sont absents ou ont subi des mutations. L'absence du bras du chromosome 3DS et la mutation deph2b ont eu l'effet le plus important en raison de la deficience ou de l'inactivite du suppresseur de Ph2. Les bras des chromosomes 3DL, 5AS et 5BS ont eu un effet promoteur, le 5BS etant le plus efficace. Un effet faiblement suppressif des chromosomes 3AS et 3AL est propose et un effet promoteur du 5DS n'a pas ete exclus. L'effet suppressif du 3BS est discute.

Discovery and Mapping of Wheat Ph1 Suppressors

“…The QPh.ucd-5S could correspond to the homeologous chromosome pairing promoting locus on the short arms of wheat chromosomes 5A, 5B, and 5D (Riley and Chapman 1967;Dvorak 1976;Cuadrado et al 1991) and on the Lophopyrum elongatum chromosome 5E (Dvorak 1987). Promotion of homeologous chromosome pairing by these loci was suggested by the observation that the level of homeologous chromosome pairing was reduced if the short arm of 5A, 5B, or 5D was absent from hybrids or haploids.…”

Synaptic behaviour of hexaploid wheat haploids with different effectiveness of the diploidizing mechanism

“…A second locus, Ph2, with a lower effect on the suppression of homoeologous pairing was localized on the short arm of chromosome 3D (Mello-Sampayo and Canas, 1973). Additionally, less effective suppressors were discovered on several other chromosomes (Sears, 1976;Cuadrado et al, 1991).…”