Breeding method of rice blast-resistant two-line sterile line

Abstract

The invention provides a breeding method of a rice blast-resistant two-line sterile line. The method includes the following steps that a long-grain high-head-rice-yield rice variety A, a variety B with high-temperature-resistant stigmas and easy-to-produce seeds, and a high-blast-resistance variety C serve as parents for producing hybridized combinations FA / FB and FA / FC which are represented by FAB and FAC respectively; FAB and FAC are planted, and FAB / FAC are hybridized to obtain a cross breeding generation represented by FABC; FABC is planted and F2 seeds are harvested; the sterility and reproductivity of a selected two-line sterile line Fs7 generation are identified by adopting an artificial climate box, a low-thermal-sensitive two-line sterile line serves as a control, and a low-thermal-sensitive two-line sterile line with the fertility and stability better than those of the control and with a low critical temperature is selected; the step of identifying the fertility, the head rice rate, the resistance and the seed production outcrossing rate is repeated, and finally the long-grain two-line sterile line which is high in head rice rate, good in outcrossing characteristic, stable in fertility, good in disease resistance and good in excellent in comprehensive property and can produce high-temperature-resistant seeds is obtained.

Description

technical field [0001] The invention relates to the field of rice breeding technology, in particular to a method for breeding rice blast-resistant two-line sterile lines. Background technique [0002] At present, rice is one of the main food crops in my country and even in the world, so it is particularly important to increase rice yield. Among them, high yield, high quality and disease resistance are important breeding goals of hybrid rice. The problems existing in the current process of rice heterosis utilization are becoming more and more obvious, concentrated in a series of problems such as small increase in per unit yield, no breakthrough in rice quality and resistance, and high risk in hybrid rice seed production. The weather is becoming more and more frequent, which brings great risks to rice production. For example, the low temperature in summer seriously affects the safety of two-line rice seed production; high temperature conditions restrict the yield and seed ger...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for breeding rice blast-resistant two-line sterile lines, which solves the defects of low yield, poor high temperature resistance and poor disease resistance of existing rice.

Images