八倍体小偃麦与普通小麦自交后代的细胞遗传学研究

CYTOGENETICS OF SELFING OFFSPRINGS BETWEEN OCTOPLOID AGROTRITICUM AND T.AESTIVUM L.

Octoploid Agrotriticum Xiaoyan 7430 and common wheat cultivar Lumai 1 were used as parents to study the cytogenetics of their 3 selfed generations (F_1, F_2 and F_3). The meiotic behavior of PMC in selfed offsprings between Xiaoyan 7430 and Lumai 1 showed that chromosome numbers in the selfed progenies decreased gradually as selfing progressed from the hybrid F_1 to F_3. The frequency of univalents and both frequency and types of multivalents at MI increased gradually as chromosome numbers of the hybrid plants increasing. However, the number of bivalents was basically 21 or so. In addition, one alien additional line of disomics was created from hybrid F_2 which had more chromosome numbers, and an individual plant with 42 chromosomes or 21 bivalents at MI was also selected. The special chromosome(s) or superior gene(s) from Agropyron has got to be preliminarily transferred to the genome of common wheat.