A hybrid rice breeding method

Abstract

The invention relates to a method for cultivating cross rice. Wherein, it comprises that (1), selecting the light-temperature sensitive sterile system with low-temperature sterile or short-light low-temperature sterile; (2), selecting the sterile masculinity as gene system; (3), crossing sterile system S with sterile masculinity system S', to obtain stable sterile masculinity S/S' F1; (4), screening and recovering system R; (5), using S/S' F1 as mother type to be crossed with recover system R, to find the needed cross combination, to produce cross rice. The invention can improve the match property of sterile system and reduce produce cost.

Description

technical field [0001] The invention relates to a method for hybrid rice breeding, in particular to a method for hybrid rice breeding by using crop low-temperature sterile or short-day low-temperature sterile light-temperature-sensitive sterile lines to produce stable nuclear male sterility. Background technique [0002] Hybrid self-pollinated plants have long been found to have heterosis, including many desirable traits. Male sterile lines have been widely valued in the field of breeding because they can avoid manual emasculation, save manpower, reduce seed costs, and ensure seed purity. Reducing the cost of hybrid seed production, increasing the degree of freedom in combination, increasing the level of heterosis, and breeding various types of excellent hybrid combinations required for production are the development trends of crop heterosis utilization. [0003] The three-line method based on the cytoplasmic-nuclear interaction male sterile line is an effective way to util...

AI Technical Summary

Problems solved by technology

However, in the seed production stage, the change of light and temperature conditions can make the sterility of the photothermosensitive GMS line fluctuate and restore the fertility

For example, the low temperature in midsummer can cause the bred high-temperature sterile or long-day high-temperature sterile type photothermo-sensitive genic male sterile lines to restore self-fertilization to varying degrees, resulting in the failure of seed production

Research and production practices in recent years have shown that due to the irresistible weather changes in nature and the large inter-annual climate change differences, it is easy to lead to the restoration of self-fertilization of photothermo-sensitive male sterile lines, and the probability of seed production failure is high, which is difficult to control artificially.