Heterosis analysis of recessive genetic all sterile line in Brassica napus L.

摘要

It is the advantage that the recessive epistasis GMS may gain all sterile line(ASL) through crossing homozygous two-type line(HTL)with temporary maintainer. Triple-cross hybrids (TCH) and single-cross hybrids (SCH) were obtained by crossing ASL and HTL with restoring line respectively, and their heterosis was compared. The result showed that majority of characters of TCH,such as plant height, location of effective branches, pods of main inflorescence and seeds of pod, were superior to the SCH, and TCH was superior to SCH in resistance to Sclerotinia sclerotiorum and yield, too. At the same time, these characters of the heterogeneous TCH were better than those of homologous TCHL ASL was more excellent than HTL and CMS in the yield of hybrid reproduction and spontaneous pollination of sterile line, as the result, the cost of hybrids reproduction reduced greatly. So hybrid reproduction of the TCH of recessive genetic ASL was convenient and it's cost also was lower, thus the TCH has vast application prospect.