Method for technically propagating dual-purpose genic male sterile rice at high altitudes

Abstract

The invention relates to a high-production low-danger propagation technology of a photo thermo sensitive genic male sterile rice, in which the propagation cost and the danger of the photo thermo sensitive genic male sterile rice are lowered by utilization of the natural low-temperature condition at high altitudes, the difficulties in propagating the dual-purpose genic male sterile rice are avoided and the development of a two-line hybrid rice is promoted. The method comprises the following steps: selecting a propagation base at appropriate altitudes that the latitude is 24 degree to 26 degree and the altitude is 1500 m to 1650 m; arranging a sowing season that the heading and flowering stage can be on about August 10th and the seeding time is generally on April 1st to April 16th at the altitudes of 1500 m to 1650 m; implementing the cultivation management technology that transplant is carried out when the sterile line leaf age is 4-5 leaves, compact planting is conducted moderately, the planting space is generally 15cm*20cm or 13cm*15cm for single-plant interposition; and arranging temperature reduction facilities in abnormal temperature in areas with favorable irrigation conditions, so that the temperature can be lowered by cold water in a mountain spring once the external temperature becomes abnormal and can not meet the temperature requirement of the sterile line in the sensitive stage.

Description

Technical field: [0001] The invention relates to a high-yield and low-risk high-yield propagation technology of a rice photothermosensitive genetic male sterile line. The proposal of this scheme is to take advantage of the natural low temperature conditions in high altitude areas, reduce the cost and risk of the reproduction of rice photothermo-sensitive genetic male sterile lines, and will promote the development of two-line hybrid rice to a certain extent. Background technique: [0002] The two-line hybrid rice has been highly valued by experts and scholars in the field of rice breeding because of its advantages such as free mating, easy breeding, extremely wide recovery spectrum and no negative cytoplasmic effects of sterility. Compared with the three-line method, hybrid rice with two-line method has great potential for high yield. Judging from the dual-purpose genetic male sterile line selected so far, we have bred a photothermo-sensitive genetic male sterile line that c...

AI Technical Summary

Problems solved by technology

However, restricted by the physiological critical low temperature, the fertile temperature range of the dual-purpose GMS line with a low sterility threshold temperature in the fertile sensitive period is very narrow (19°C to 21°C), which makes it possible to breed in situ under natural conditions. extremely difficult

However, the utilization of spring propagation in Hainan and cold water series irrigation can solve the problem of temporary multiplication of dual-purpose GMS lines to a certain extent, but increases the cost of multiplication and will lead to multiplication failure if a little carelessness ( The success rate of breeding in Hainan is less than 40%)

Therefore, the breeding of dual-purpose GMS lines and the safe production of two-line hybrid rice seeds have become the main bottleneck restricting the development of two-line hybrid rice.

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