Method for improving shade tolerance of maize inbred lines

An inbred line and ability technology, applied in the directions of botanical equipment and methods, application, plant genetic improvement, etc., can solve the problems of non-reduction in yield and weak shade-tolerant ability of corn inbred lines, to enhance resistance and increase shade-tolerant species. quality resources, and the effect of alleviating disaster losses

CN106577255APending Publication Date: 2017-04-26漯河市农业科学院
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-04-26
Patent Text Reader

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.
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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...

Examples

Embodiment Construction

[0017] The present invention will be further described below in conjunction with specific embodiments. It should be understood that the following examples are only used to illustrate the present invention rather than limit the scope of the present invention, and those skilled in the art can make some non-essential improvements and adjustments based on the content of the above invention.

[0018] The method for improving the shade tolerance of corn inbred lines of the present embodiment comprises the following steps:

[0019] (1) In the winter of 2012, the inbred line Zhong 72 with strong shade tolerance was selected as the male parent, and the corn inbred line 502 with weak shade tolerance was selected as the female parent, and a hybrid combination 502 × Zhong72 was selected in Sanya, Hainan. Among the inbred lines with strong shade tolerance, 72 were male parents, and 502 inbred lines were female parents;

[0020] (2) In the summer of 2013, the hybrid combination 502×Zhong72...