Method for enhancing seed production efficiency of hybrid rice by kernel miniaturization improvement of male sterile line

Abstract

The invention relates to a seed production method of hybrid rice, in particular relating to a method for enhancing seed production efficiency of hybrid rice by kernel miniaturization improvement of a male sterile line. Aiming at the problems of low planting efficiency, high cost and the like due to large kernel in the prior art, the invention uses the method for enhancing seed production efficiency of hybrid rice by kernel miniaturization improvement of a male sterile line to transduce granule mutant gene sg into a male sterile line by sexual hybridization to ensure that the kernel of the male sterile line becomes small without changing the size of rice kernel produced by hybrid rice, thus reducing seed production area, improving land utilization efficiency, reducing seed purchasing cost for rice farmers, and improving rice farmer profit. The invention has the main technical scheme that hybrid rice containing a granule mutant gene sg serves as a donor and is hybridized with CMS maintainer line hybrid rice, two-line sterile line hybrid rice or other types of sterile line hybrid rice receptors, and a maintainer line or a male sterile line containing the mutant gene sg can be obtained by selection of 5-7 generations.

Description

technical field [0001] The invention relates to a hybrid rice seed production method, in particular to a method for improving hybrid rice seed production efficiency by improving sterile lines through miniaturization of grains. Background technique [0002] Plant heterosis is universal, and whether this advantage can be effectively utilized depends to a large extent on whether the cost of producing hybrids, that is, seed production, is low, and whether users have purchasing power. Hybrid rice has been successfully popularized and utilized in my country for more than 30 years. In order to obtain a higher yield potential of hybrid rice, increasing the grain weight of rice grains is one of the most used methods at present, but this has also led to a decrease in the amount of rice used in agriculture. (weight) increases and invests more in the cost of purchasing seeds. [0003] A small-grain mutant (ZH-sg) obtained by r-ray mutagenesis is controlled by a single recessive gene (sg...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low planting efficiency and high cost in the prior art due to large grains, the present invention provides a method for improving the seed production efficiency of hybrid rice through miniaturization of grains and improving the sterile line. This method mutates small grains through sexual hybridization The gene sg is transferred into the sterile line, which only makes the grain of the sterile line itself smaller, without changing the grain size of the rice produced by the hybrid rice, thereby reducing the seed production area, improving land use efficiency, and reducing the cost of rice farmers purchasing seeds Benefits for rice farmers

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