Breeding method of erect panicle, long-stigma and elongated upmost internode two-line male sterile lines

Abstract

The invention discloses a breeding method of erect panicle, long-stigma and elongated upmost internode two-line male sterile lines, and belongs to the technical field of breeding of rice male sterile lines. The method is characterized in that parents are provided according to erect panicle rice, long-stigma rice and elongated upmost internode rice as target traits; excellent two-line male sterile lines with relatively large production popularization area are treated as recurrent parents; the beneficial trait genes of the three types of rice are backcrossed and introduced into two-line male sterile lines recurrent parents by hybridization and composite cross and target traits selecting and other technological methods, so as to obtain special two-line male sterile lines which are highly consistent with two-line male sterile lines recurrent parents in agronomic traits, transformation temperature in sterility period and sterility and integrate traits of erect panicle, long-stigma and elongated upmost internode; with the adoption of the special two-line male sterile lines for breeding two-line hybrid rice, the production yield of hybrid rice seeds can be increased, the cost can be reduced, and the pollution is lowered down.

Description

technical field [0001] The invention specifically relates to a method for selecting a two-line sterile line with erect panicle, long stigma and long panicle neck, and belongs to the technical field of rice part and line breeding. Background technique [0002] The dwarf breeding in the 1960s increased the rice yield in my country by 30%, and the three-line hybrid rice successfully bred in the 1970s increased the yield by 20% compared with the dwarf rice. These are two major leaps in my country's rice science and technology revolution. The two-line hybrid rice successfully bred in the 1990s has further increased the rice yield in my country. However, the male sterile lines of the two-line hybrid rice that are popularized and applied in production at present have severe ear wrapping. In seed production, gibberellin needs to be sprayed to solve the ear wrapping problem, which not only increases the cost of seed production, but also causes environmental pollution. , Breeding th...

AI Technical Summary

Problems solved by technology

However, the male sterile lines of the two-line hybrid rice that are popularized and applied in production at present have severe ear wrapping. In seed production, gibberellin needs to be sprayed to solve the ear wrapping problem, which not only increases the cost of seed production, but also causes environmental pollution. , the breeding of two-line male sterile lines with long panicle neck can achieve genetic release or alleviate panicle wrapping, without or less use of gibberellin, so that the seed production cost of hybrid rice can be reduced, seed quality can be improved and environmental pollution can be reduced