Breeding method of multi-grain three-line japonica sterile line Thai 765A and application thereof

Abstract

The invention discloses a breeding method of a multi-grain three-line japonica sterile line Tai 765A and an application thereof, and particularly relates to the field of crop breeding, the method comprises the following steps: S1, early-stage multi-year cultivation: hybridizing Yunjing 26 / Wuyunjing 7, carrying out multi-generation (year) breeding to obtain an early-maturing japonica material E166, hybridizing the early-maturing japonica material E166 with Xiushui 09, carrying out multi-year breeding to generate F1 rice, and carrying out anther culture on the F1 rice to obtain H1; and S1, second-stage multi-year cultivation: S2.1, selecting 38 parts of H1 single plants with good plant types obtained in the step S1, hybridizing the H1 single plants and H1 / Yunjing 26 / Xu rice 3 to obtain dwarf multi-tiller materials 223, performing combined fertilizer planting F1 generation on the dwarf multi-tiller materials 223 in the same year in the right season, and screening out 33 parts of dwarf single plants with good plant leaf shapes in Hainan in spring 2014 through multi-generation selection. According to the method, an early-maturing dwarf variety is cultivated by using an early-maturing dwarf parent material; disease-resistant varieties are popularized, damage caused by rice blast and false smut is avoided, and food safety is ensured.

Description

technical field [0001] The invention relates to the technical field of crop breeding, more specifically, the invention relates to a multi-grain type three-line japonica male sterile line Tai 765A breeding method and its application. Background technique [0002] Since the late 1920s, a large number of indica and japonica hybrids have proved that there is no inmembrability between indica and japonica rice, and the chromosome behavior of pollen mother cells in the first generation of hybrids is basically normal during meiosis. However, the hybrid offspring have a low seed setting rate and severe segregation of characters, and their performance is quite different from the hybrids obtained by crossing within the subspecies. [0003] The seed setting rate of the first generation of indica and japonica hybrids is usually between 5% and 40%, but there are also some that are false or have a higher seed setting rate or even close to normal. Generally, it seems to be related to the o...

AI Technical Summary

Problems solved by technology

However, indica rice and japonica rice belong to two subspecies of rice, with long genetic distance, hybridization incompatibility between the two, low seed setting rate of hybrid offspring, super close late maturing in growth period, poor grain filling degree, high plant height, poor rice quality, etc. It affects the direct use of heterosis between subspecies and has become a worldwide problem

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