Application potential analysis of dwarf mutant M6 in Brassica napus L.
Reducing plant height could significantly improve lodging resistance,increase planting density,and increase yield and harvest index of Brassica napus L.M6 is a semi-dominant dwarf mutant with plant height of 71cm at maturity and compact plant architecture.In order to explore the utilization value of M6 in hybrid produc-tion,F1 hybrids were generated by crossing six rapeseed cultivars(Yangguang 2009,Huashuang 5,Hua 128,Hua 919,Zheyou 7 and Zhongshuang 11)with the M6 mutant.Compared to the six wild-type rapeseed varieties,the plant height,the first primary branch height,the internode length and the branch angle of the F1 hybrids are signifi-cantly reduced.The length of main inflorescence of some hybrids did not change significantly,while the length of main inflorescence of some hybrids decreased significantly.The root crown diameter in the F1 hybrids are signifi-cantly increased compared to their corresponding of the wild-type parents.The effective branch numbers,the num-bers of effective siliques on the main inflorescence,the silique number per plant and the yield per plant of most F1 hybrids increased significantly.These results demonstrated that the F1 hybrids produced between M6 and wild-type tall varieties are of semi-dwarf statures and compact plant architecture,and have strong heterosis of seed yield,indi-cating that M6 is an elite dwarf gene resource and has great potential value in the semi-dwarf rapeseed hybrid breeding programs.
万方数据
维普
