Breeding method of long and small grain type two-line sterile line of rice and light and simple seed production method of hybrid rice

Abstract

The invention discloses a breeding method of a long and small grain type two-line sterile line of rice and a light and simple seed production method of hybrid rice. The breeding method comprises the following steps: hybridizing C815S serving as a female parent and Taifeng B serving as a male parent to obtain a hybrid F1, planting F1 to obtain a generation F2, screeningout seeds with grain length of more than 10 mm and thickness of less than 2 mm from the generation F2, and planting the seeds to obtain a generation F3; screening out seeds of single plants with strong tillering ability, short plants, grain length of more than 10 mm and thickness of less than 2 mm from the F3 generation, planting the seeds to obtain a generation F4, screening out seeds of plants with good rice quality, grainlength of more than 10 mm and thickness of less than 2 mm from the generation F4 and the generation F5, and planting the seeds, and culturing for more than four generations to obtain seeds of the generation F9 or above, and the seeds are the rice long and small grain type two-line sterile line. According to the breeding method of the long and small grain type two-line sterile line of rice, the obtained rice long and small grain type two-line sterile line has the characteristics of being ideal in plant type, good in outcrossing characteristic, high in combining ability, good in resistance, highin rice quality and the like, and is suitable for light, simple and mechanical seed production.

Description

technical field [0001] The invention relates to the field of hybrid rice, in particular to a breeding method for long and small-grain two-line male sterile lines of rice. In addition, the invention also relates to a light and simplified seed production method of hybrid rice. Background technique [0002] In the early days, the American Circle Seed Company began to conduct mechanized seed production experiments on the hybrid rice combination Nanyou 2 selected and bred in my country; after that, Germany, Japan and other countries also successively carried out research on hybrid rice mechanized seed production technology. American Rice Technology Corporation, German Bayer Corporation and other South American countries, such as Brazil and Argentina, have adopted seed production technologies such as mechanical dry-drilling of parents, mechanical or agricultural aircraft spraying and fertilization, helicopter powder catchment, and mechanical harvesting, etc., to realize large-scal...

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Problems solved by technology

[0006] The invention provides a breeding method of long and small-grain two-line male sterile line of rice and a light and simple seed production method of hybrid rice, so as to solve the problem of combining rice with the existing rice small-grain male sterile line suitable for light and simple mechanized seed production. poor quality problem

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