A method for breeding a three-line sterile line of hybrid rice with white midribs on leaves

Abstract

The invention discloses a breeding method of a hybrid rice three-line sterile line with leaves carrying white midribs. The breeding method comprises the steps: with Zhe midrib rice as a male parent and a rice variety of the three-line sterile line as a female parent, selfing after hybridizing to obtain F2; performing selfing on plants with white midribs and excellent characters, which are selected from the F2, performing continuous selfing on plants which have white midribs and excellent characters, are capable of keeping the sterility characteristics of the three-line sterile line, and are selected from the selfed later generation to obtain a hybrid rice three-line maintainer line with leaves carrying white midribs; with the hybrid rice three-line maintainer line as a male parent, performing test crossing with a rice variety of the three-line sterile line; performing back-crossing on sterile plants selected from the later generation obtained through test crossing, and the hybrid rice three-line maintainer line; with the hybrid rice three-line maintainer line as a cycle parent, performing continuous back-crossing on sterile plants with white midribs, which are selected from the later generation and obtained through back-crossing, and the cycle parent to obtain the hybrid rice three-line sterile line with leaves carrying white midribs. In the sterile line obtained by the invention, the marked characters are expressed in the midribs of the leaves only, without influencing the economical characters; hybrids can be simply rejected, and the purity can be identified.

Description

technical field [0001] The invention relates to the technical field of crop genetics and breeding, in particular to a method for breeding a three-line male sterile line of hybrid rice with leaves carrying white midribs. Background technique [0002] The annual planting area of ​​hybrid rice in my country accounts for about half of the total planting area of ​​rice. High-purity and high-quality hybrid rice seeds are the basic guarantee for a large number of rice farmers to harvest. It is one of the breeding goals of breeders to cultivate excellent agronomic traits and to be simple, controllable and pure in the production of hybrids. For this reason, breeders design to combine leaf color markers with breeding, introduce leaf color markers into sterile lines, and cultivate sterile lines with leaf color markers, so as to facilitate the removal of self-bred seeds and hybrids according to the significant difference in leaf color , to achieve the goal of easy identification of hy...

AI Technical Summary

Problems solved by technology

[0004] However, it is worth noting that the existing leaf color markers such as green-turning albino leaf color, purple leaf, yellow leaf, light green and striped vein markers are expressed in large areas in leaves, which have a great impact on the photosynthesis of rice and reduce the The photosynthetic efficiency of rice, which more or less affects the growth period and agronomic traits of rice and even the cultivated sterile lines

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