Method for breeding dual-purpose genic male sterile line of multi-panicle super hybrid rice with strong tillering capability

Abstract

The invention discloses a method for breeding a dual-purpose genic male sterile line of multi-panicle super hybrid rice with strong tillering capability. The method comprises the following steps: S1: F1-generation seeds are obtained by hybridizing an authorized or shaped dual-purpose genic male sterile line taken as a female parent and a material with the marked character of strong tillering capability as a male parent; S2: the F1-generation seeds are sown, excellent plants with characteristics of the dual-purpose genic male sterile line as well as the strong tillering capability are screened out and subjected to backcrossing with a female parent dual-purpose genic male sterile line, and BC1F1-generation seeds are obtained; S3: the BC1F1-generation seeds are sown, excellent plants with characteristics of the dual-purpose genic male sterile line as well as the strong tillering capability are screened out continuously and subjected to backcrossing with a female parent dual-purpose genic male sterile line, and BC2F1-generation seeds are obtained. The dual-purpose genic male sterile line with strong tillering capability can be bred effectively with the method, and novel combination of the multi-panicle super hybrid rice can be formed through matching even through a restorer line with strong combining ability but weaker tillering capability; the breeding efficiency is higher, implementation is simple and convenient, and the cost is low.

Description

technical field [0001] The invention relates to the field of agricultural biotechnology, in particular to a method for breeding a multi-spike super hybrid rice dual-purpose male sterile line with strong tillering ability. Background technique [0002] Since 2000, my country's super hybrid rice breeding has increasingly tended to use large spike varieties, but large spike varieties have also exposed many problems, because of their thick stems, large spikes, high spike rate, but weak tillering ability , the number of effective panicles per 666.7m2 is obviously lower than that of general hybrid rice varieties. In order to increase the biomass, maximize the number of effective panicles and obtain high yield, a large amount of nitrogen fertilizer has to be applied, every 666.7m 2 The amount of pure nitrogen applied in the plant has reached an unprecedented 28 kg, which is about twice the amount of nitrogen fertilizer applied by ordinary farmers for one season of rice. The yield h...

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Problems solved by technology

[0002] Since 2000, my country's super hybrid rice breeding has increasingly tended to use large spike varieties, but large spike varieties have also exposed many problems, because of their thick stems, large spikes, high spike rate, but weak tillering ability , the number of effective panicles per 666.7m2 is significantly lower than that of general hybrid rice varieties

In order to increase the biomass, maximize the number of effective panicles and obtain high yield, a large amount of nitrogen fertilizer has to be applied, every 666.7m 2 The amount of pure nitrogen applied in the plant has reached an unprecedented 28 kg, which is about twice the amount of nitrogen fertilizer used by ordinary farmers for one season of rice. The yield has increased, but the amount of fertilizer and the cost have increased significantly

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