Method for improving shade tolerance of maize inbred lines

Abstract

The invention discloses a method for improving shade tolerance of maize inbred lines, and belongs to the technical field of maize breeding. Specifically, an inbred line B (as a male parent) with strong shade tolerance and an inbred line A (as a female parent) with weak shade tolerance are used for forming a crossing combination A*B; A is used as a backcross parent under the condition of artificial simulated shading; after backcrossing for two generations, individual plants which have relatively short male and female interval and are similar to the inbred line A are selected under the condition of artificial simulated shading to perform successive inbreeding for three to four generations, so as to improve the shade tolerance of the inbred line A. The method provided by the invention is short in time for improving the inbred line with weak shade tolerance, low in cost and high in efficiency, overcomes a defect that the bred new maize varieties are intolerant to shade, accelerates breeding of maize shade-tolerant varieties, enhances the capability of new maize varieties to resist rainy sparse sunlight disaster, and mitigates disaster losses.

Description

technical field [0001] The invention belongs to the technical field of corn breeding, and in particular relates to a method for improving the shade tolerance of corn inbred lines. Background technique [0002] Corn is the largest crop in my country and belongs to light-loving crops. However, affected by global climate change, the number of sunshine hours during the growth of corn in the Huanghuaihai and Southwest mountainous and hilly areas has decreased year by year in recent years, and the frequency and severity of rainy and less-sunshine disasters have continued to increase. Seriously affect the high yield and stable yield of corn. Therefore, speeding up the breeding of shade-tolerant varieties is of great significance to the sustainable development of maize. [0003] To improve the shade tolerance of maize varieties, the key is to breed maize inbred lines with strong shade tolerance. The breeding of maize inbred lines is still in the conventional breeding stage, and ther...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for improving the shade tolerance of corn inbred lines, aiming at the shortcomings of weak shade tolerance of corn inbred lines, so as to realize high yield of new corn varieties and at the same time enhance shade tolerance, and resist cloudy, rainy and lack of sunshine disasters , to ensure less or no reduction in production in disaster years