Selecting and breeding technology of stalk-wall-thickened lodging-resistant two-line male sterile line

Abstract

The invention aims to provide a selecting and breeding technology of a stalk-wall-thickened lodging-resistant two-line male sterile line. The selecting and breeding technology comprises the steps thatfirstly, rice 9311 is selected as a base selecting and breeding material, and then radiation is conducted by using Co-60 rays; secondly, mutant rice 9311 obtained after mutation in the first step isselected and bred, single-plant transplanting is conducted on the mutant rice 9311, so that a perennial sterile mutant line is subjected to stability and sterility propagation, and the male-sterile rice, namely Xi08S, is obtained; thirdly, hybrid selecting and breeding are conducted, wherein the mutant rice 9311 obtained in the first step and the Xi08S obtained in the second step are selected generation by generation repeatedly and then subjected to backcrossing with Xi08S until to cultivate the final Xi08S thickened stalk-wall-thickened lodging-resistant two-line male sterile rice with basicgenetic characters similar to those of the Xi08S, and the high-quality lodging-resistant two-line hybrid rice is obtained. The stalk wall is thickened, the lodging-resistant phenomena are reduced, theyield is improved, meanwhile, the harvesting difficulty is reduced, and the rice quality is improved.

Description

technical field [0001] The present invention relates to the field of rice breeding technology, and mainly relates to the improvement and design of the breeding technology of rice with thickened stalk wall and lodging resistance type, especially relates to a two-line hybrid rice with thickened stalk wall and lodging resistance type. Breeding techniques for breeding lines. Background technique [0002] At present, rice production is often attacked by typhoons and rainstorms and causes rice lodging. Lodging is a major obstacle to high-yield rice. The earlier the lodging, the greater the impact on yield. It is estimated that lodging in the milky stage of rice will reduce yield by 34%. Lodging will reduce production by 20% during the wax ripening period and the yellow ripening period. Lodging not only causes yield reduction, but also takes a lot of time and labor during harvesting, which affects rice quality. The main reason for rice lodging is that, in addition to typhoon storm...

AI Technical Summary

Problems solved by technology

Lodging not only causes yield reduction, but also takes a lot of time and labor during harvesting, which affects rice quality. The main reason for rice lodging is that, in addition to typhoon storms, there are many effective panicles per unit area of ​​rice, poor lodging resistance of plants, and fields with a lot of nitrogen application. The probability is high. Under the condition that the rice production environment factors and cultivation management level are basically the same, the lodging resistance of different varieties has certain differences.