A kind of breeding method of original seed of two-line sterile line

Abstract

The invention provides a safe and efficient method for propagating breeder seeds of a two-line sterile line. The method comprises the following steps: sowing, in December, sowing the two-line sterile line in a region of which the daily mean temperature is stable and more than or equal to 22 DEG C, wherein the field management before heading is same as that of a general field; performing field management before and after heading, namely applying urea timely 7 days before the heading of the two-line sterile line, and discharging water accumulated in fields after the heading while keeping the fields moist; obtaining rice stumps of the two-line sterile line, namely selecting a single plant, and cutting stubbles to obtain the rice stumps of the two-line sterile line; transplanting the rice stumps of the two-line sterile line, namely from April 15 to May 5, planting the rice stumps of the two-line sterile line in a rectangular area of which the width is within 0.9m in a concentrated mode in a region of which the daily mean temperature is stable and more than or equal to 19 DEG C; harvesting seeds, namely harvesting mature seeds after the heading of the two-line sterile line. The output of the breeder seeds of the two-line sterile line obtained by the method provided by the invention is large, and the drift of the critical temperature of the breeder seeds can be effectively prevented at the same time.

Description

technical field [0001] The invention belongs to the field of rice hybrid breeding, in particular to a safe and efficient breeding method for the original seed of two-line male sterile line of hybrid rice, and also relates to a special isolation cover for the breeding method. Background technique [0002] Rice is the largest food crop in my country. Since the 1970s, Chinese scientists have successfully bred the male sterile line of rice nuclear-cytoplasmic interaction, and successfully realized the three-line matching. Following the three-line hybrid rice, my country has created a high-tech two-line hybrid rice with the main content of utilizing photothermo-sensitive sterility. The two-line method has many advantages such as free combination and dual-use in one line, and the breeding progress is very fast. A large number of new hybrid rice varieties of the two-line method have been bred and popularized in production. [0003] The photothermosensitive genic male sterile line ...

AI Technical Summary

Problems solved by technology

For this reason, Yuan Longping proposed to use the artificial climate chamber to produce "core seeds" as the key technology. Since then, some scholars have proposed a method using A method for producing core seeds by cultivating a single plant "three-layer panicle" of a photothermosensitive male sterile line under cold water or natural low temperature treatment

The "three-layer panicle" method uses the natural low temperature of spring water or formation water in reservoirs. The actual application is limited by natural resources in various places, and the technical measures are relatively complicated. In addition, bagging and self-crossing are still required, and the operation is difficult and cumbersome.

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