Breeding method of hybrid rice

Abstract

The invention discloses a breeding method of hybrid rice. The breeding method comprises the following steps: determining strong and preferable hybridized combination; selecting an existing conventional japonica rice variety and strain with excellent characters for crossed matching, observing the hybrid vigor of the hybridized F1, identifying output, quality and resistance thereof, and breeding advantageous combination P1 / P2; separating establishing a three-line sterility line P1A and a two-line sterility line P1S by P1 according to the advantageous combination; establishing a recovery line P2-recovery; configuring a hybrid sterility line F1(P1S / P1A) by taking the three-line sterility line P1A as a female parent and the two-line sterility line P1S as a male parent; and configuring the hybridized combined P2-recovery / / P1S / P1A with the recovery line P2-recovery by taking the hybrid sterility line F1(P1S / P1A) as female parent. The breeding method disclosed by the invention can solve the technical problems that the existing three-line hybrid rice is not good in hybrid vigor and the safety coefficient of production of hybrid seeds of two-line hybrid rice is low.

Description

technical field [0001] The invention relates to a hybrid rice breeding method, in particular to a breeding method which not only has the safety of three-line hybrid rice seed production, but also has the high-yield and high-quality characteristics of two-line hybrid rice. Background technique [0002] At present, hybrid rice in the world mainly includes three-line hybrid rice and two-line hybrid rice, both of which have their own advantages and disadvantages. From the perspective of rice yield and rice quality, the heterosis of seeds produced by the two-line method is more obvious than that of the seeds produced by the three-line method, but the fertility of the sterile line of the two-line seed production is affected by certain temperature and light conditions. The ones under control generally show male sterility under the conditions of long sunshine of more than 13.45h and average daily temperature higher than 24°C, and can be used for seed production; when the length of s...

AI Technical Summary

Problems solved by technology

From the perspective of rice yield and rice quality, the heterosis of seeds produced by the two-line method is more obvious than that of the seeds produced by the three-line method, but the fertility of the sterile line of the two-line seed production is affected by certain temperature and light conditions. The ones under control generally show male sterility under the conditions of long sunshine of more than 13.45h and average daily temperature higher than 24°C, and can be used for seed production; when the length of sunshine is shorter than 13.45h and the average daily temperature is lower than 24°C , the fertility of the sterile line changes, from sterile to fertile, self-fertile, unable to produce seeds, and can only be used for sterile line reproduction

Therefore, two-line hybrid rice seed production is affected by light and temperature conditions, and has certain risks.

The sterile line of three-line hybrid rice is not affected by the environment, and the safety factor of seed production is high, but the heterosis (yield and quality) of three-line hybrid rice is not as good as that of two-line hybrid rice

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