Seed breeding and application of rape environmental sensitivity nucleus sterile line with self-incompatibility characteristic

Abstract

The invention discloses a seed selection method of rape environmental sensitivity nuclear sterile line with self-incompatibility characteristic. In the method, nuclear sterile rape sensitive to photoperiod, temperature and the like is selected to hybridize with self-incompatibility line, environmental sensitivity nuclear sterile line with self-incompatibility characteristic is selected from the progeny as a female parent of two-line hybrid cultivar. The rape environmental sensitivity nuclear sterile line with self-incompatibility characteristic selected by the invention is applied to production of hybrid seeds, selfing fructification probability of the environmental sensitivity sterile line in the production link can be reduced and purity of the hybrid seeds can be improved.

Description

technical field [0001] The invention belongs to the field of obtaining new plants, and relates to a rapeseed male sterile line, in particular to the selection and application of a rapeseed environment-sensitive male sterile line with self-incompatibility characteristics. Background technique [0002] The utilization of crop heterosis must rely on a stable and reliable pollination control system. Self-incompatibility and environment-sensitive nuclear male sterility are two important pollination control systems in rapeseed. Self-incompatibility phenomenon widely exists in Brassica napus x Brassica napus hybrid progenies, Chinese cabbage and Brassica napus (Yang Guangsheng, Fu Tingdong, Self-incompatibility hybrids of rapeseed, edited by Fu Tingdong: Breeding and Utilization (Second Edition), Hubei Science and Technology Press, 2000, p112-148). The self-compatibility index of strict self-incompatibility lines (dividing artificially pollinated self-fertilized seeds by the numb...

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of environmentally sensitive sterile lines is that their fertility is not stable. In the seed production area, if the flowering period encounters special weather such as continuous rain and cooling, the fertility will be restored temporarily (1 to 3 days), and self-fertilizing seeds will be mixed into hybrids. Seed purity cannot be guaranteed, and the risk of seed production failure is relatively high, which limits the promotion of these two-line hybrid rapeseed