Regulation of homoeologous pairing in pentaploid wheat hybrids

✍ Scribed by U. Kushnir; G. M. Halloran

• Book ID: 104624501
• Publisher: Springer Netherlands
• Year: 1982
• Tongue: English
• Weight: 244 KB
• Volume: 58
• Category: Article
• ISSN: 0016-6707
• DOI: 10.1007/bf00056002

✦ Synopsis

Comparisons were made of levels of chromosome pairing in pentaploid hybrids between normal and phth-and Ph2-mutant forms of Triticum aestivum ssp. vulgare cv. Chinese Spring each crossed with Triticum kotsch.vi and T. turgidurn var. dicoccoides. Higher levels of multivalent formation in the Phlb-kotschyi, compared with the Phlb-dicoccoides pentaploid was attributed mainly to the absence of allelic buffering, by the Ph I allele, in the kotschyi pentaploid and its presence in the dicoccoides pentaploid. The higher level of homoeologous pairing in the Ph2-dicoccoides pentaploid compared with that of kotschyi was believed to be due to differential levels of homoe-and non-homoallelic buffering in the two pentaploids. The high level of homoeologous pairing caused by the Ph2-mutant in the dicoccoides pentaploid indicates a potential use of pairing promoters, free ofhomoallelic buffering, as a means of increasing thelevel of homoeologous pairing in wheat and in certain of its hybrids with alien species.