Genotypic control of chromosome pairing in amphiploids involving the cultivated oatAvena sativaL.

✍ Scribed by Hugh Thomas; N. Al-Ansari

• Publisher: Springer
• Year: 1988
• Tongue: English
• Weight: 499 KB
• Volume: 37
• Category: Article
• ISSN: 0014-2336
• DOI: 10.1007/bf00037221

✦ Synopsis

A genotype of the diploid species Avena longiglumis (Cw 57) has been shown to modify the genetic control of diploid-like chromosome pairing in the cultivated oat, A . sativa (2n=6x=42) leading to increased homoeologous chromosome pairing in 4x hybrids between the two species (Rajhathy & Thomas, 1974) . The Cw 57 genotype has a similar effect in increasing homoeologous chromosome pairing in amphiploids combining diploid and hexaploid genomes including associations between alien chromosomes and their corresponding pairs in hexaploid species . The effect of the Cw 57 genotype is probably in altering the specificity of chromosome pairing in the early stages of meiosis . The use of the Cw 57 genotype to induce homoeologous chromosome pairing as a technique for the transfer of desirable alien variation into the cultivated oat is discussed .