Inheritance study and utilization of Leaf-on-leaf marker character in Brassica napus L

摘要

The leaf-on-leaf in Brassica napus L. is an easy to identify morphological marker character during seedling stage. The main expression is that a couple of leaflets growing on its normal leaf.. It has the great research and utilization value on rapeseed genetics and breeding. We investigated its growth location, size, genetic mechanism and relations with the nuclear male sterile genes. The results showed: 1～5 leaf-on-leaf leaflets grown on the face of vein every normal leaf, the size of leaflet ranged 0.05～4.20 m2. The leaf-on-leaf character was dominant relative to the non leaf-on-leaf and it was controlled by two genes in B. napus. The new recessive male sterile line of leaf-on-leaf was obtained through backcross breeding with the recessive male sterile line 98-116A and the leaf-on-leaf line T2632 as parents. The leaf-on-leaf male sterile line has the advantage of higher sterile plants ratio, and its sterile plants ratio had reached above 90% and higher observably than 98-116A' sterile plant ratio. Research result showed that its genetic mechanism was different from normal rapeseed recessive male sterile lines. The main aim in this paper was to summrize and evaluate the investigated results and iutilization foreground about leaf-on-leaf in B. napus L.