Two-line hybridization method for producing sorghum seeds

Abstract

A two-line hybridization method for breeding sorghum features that cultivating the dual-purpose sterile line having high origin temp from the sorghum seeds whose fertility has temp and light sensitivity by selecting layering object at 24.5-26.5 deg.C, obtaining purified and stable dual-purpose sterile line by creating the purifying and reproducing system of key seeds by controlling temp and light radiation in the sensitive period of fertility transform, and cultivating two-line hybridized seeds at proper ecological condition. Its advantages are wide range of production, high safety and high purity.

Description

technical field [0001] The invention relates to the production of sorghum seeds, in particular to a production method of two-line hybrid sorghum seeds. Background technique [0002] The use of heterosis in sorghum, since the first cytoplasmic male sterile line TX3197A was bred in the United States in the 1950s, the three-line method is mainly used in the world. The utilization of sorghum heterosis in the two-line method is based on the three-line method, omitting the maintainer line, and relying on the temperature- and light-sensitive characteristics of the dual-purpose sterile line of sorghum, that is, it is fertile under certain temperature and light conditions. It is used for self-propagation and reserved seeds; it is sterile under another temperature and light condition, and is used for hybridization with restorer lines to produce first-generation hybrid seeds. In 1993, India reported the discovery of sorghum photothermosensitive cytoplasmic male sterile material, and p...

AI Technical Summary

Problems solved by technology

However, in the process of using Xiangnuoliang S-1 to produce two-line sorghum hybrid seeds, there are still two problems in the following aspects: 1. Due to the low starting temperature for inducing the stable sterility of dual-purpose sterile lines, it makes safe seed production The selection range of the ecological point is narrow, which is only suitable for winter seed production in Hainan, and it is difficult to produce large-scale seed; 2. Due to the phenomenon of genetic drift in the starting temperature of the dual-use male sterile line's fertility conversion, under the temperature and light conditions of seed production, the two The proportion of fertile plants using sterile lines rises to more than 50%, and the purity of hybrid seeds produced is difficult to guarantee