Technical method for cultivating optical thermosensitive genetic male sterile line with low fertility transformation starting point temperature

Abstract

The invention discloses a technical method for cultivating an optical thermosensitive genetic male sterile line with low fertility transformation starting point temperature. According to the technical method for cultivating the optical thermosensitive genetic male sterile line with the low fertility transformation starting point temperature, unique natural light and temperature conditions in Sanya in Hainan province is fully used, hybridization is achieved by an excellent optical thermosensitive genetic male sterile gene donor parent and an excellent receptor parent (or back crossing is achieved for one time), a group of F2 generation (or BC1F2 generation) are sown by stages from the last ten-day period of December, each stage lasts five days, and the number of the stages is ten, the heading stage of the group is enabled to cover a sterile line fertility transformation stage, a plurality of single plants which are transferred into sterile lines early are selected in the group, cold penetration is carried out, seeds of selfing fructification are collected, added generation is planted in the middle-ten-day of August, a secondary stage screening is carried out in the last ten-day period of December, cold penetration is carried out on the single plants which are transferred into sterile lines early, seeds of selfing fructification are collected, adding generation and screening are carried out again, single plants (lines) which are transferred into sterile lines early are selected, and the selected single plants (lines) are placed in a target application eco-region for being identified, named, and applied by being put into a matching group.

Description

(1) Technical field: [0001] The invention belongs to the field of hybrid rice genetics and breeding, and is based on the characteristic that the fertility of photothermosensitive male sterile lines changes with the change of light and temperature conditions. A technical method for a photothermosensitive genic male sterile line with a low temperature at the onset of sex conversion. (two) background technology: [0002] Since the beginning of the 21st century, the development momentum of two-line hybrid rice has been strong. At present, two-line hybrid rice has become an indispensable type of rice production in my country and has played an important role in ensuring food security. However, the development of two-line hybrid rice is also facing severe challenges. In recent years, the climate has been abnormal, and low temperature in midsummer frequently occurs, which poses a huge threat to the safety of two-line hybrid rice production. In late July 2009, the Jianghuai region, ...

AI Technical Summary

Problems solved by technology

In addition, the starting temperature of the fertility conversion of some photothermosensitive genic male sterile lines that has been practically used is too high, which not only increases the unsafe factors of two-line hybrid rice seed production, but also limits the ecological area of ​​seed production to a large extent, so that Seed production faces the dilemma of high risk and high cost

Seriously affect the further popularization of two-line hybrid rice