Method using corn Suwan germplasm to breed light-insensitive inbred line

Abstract

The invention relates to the technical field of crop breeding, in particular to a method using corn Suwan germplasm to breed a light-insensitive inbred line. The method has the advantages that a method using low-generation large-population middle-density planting, middle- and high-generation small-population head progeny row planting, middle-generation high-density selection, a northern fixed sowing day and pollination time setting is used to perform 'south-north shuttle selection', the Suwan germplasm is used as the basic population, the low and middle generations are used to breed the inbredline in south China, the middle and high generations are used to breed the inbred line in northern seed production areas, the light-insensitive Suwan inbred line which can be utilized in the mountainous regions in south China is finally bred, and a batch of excellent corn varieties which can be produced and applied in the mountainous regions in south China is bred through the inbred line.

Description

technical field [0001] The invention relates to the technical field of crop breeding, in particular to a method for breeding light-insensitive inbred lines based on maize Suwan germplasm. Background technique [0002] Corn is one of the main food crops in the world, and it has been called the king of feed, and it is also the earliest crop that utilizes heterosis and has the most significant yield increase. Therefore, the development of corn production plays a vital role in ensuring food security and promoting the development of animal husbandry. [0003] The ecological environment in the mountainous areas of Southwest China is complex, the soil is poor, and at the same time, the drought in the early stage of corn growth and the continuous rain in the late stage lead to high requirements for the disease resistance (reversal) of the variety in production; and the Suwan germplasm from the tropical (sub) zone It has the advantages of disease resistance (inverse) and good grain ...

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Problems solved by technology

[0004] The combination mode of Suwan germplasm in this area is mostly combined with temperate zone germplasm, and temperate zone germplasm has a shorter growth period and poorer quality than Suwan germplasm; in the production of seeds in Southwest China, the quality of the produced seeds is poor, The yield is low, and because of its unstable climate factors, it may lead to reduced or no harvest in seed production; in northern China, the conditions of light and temperature are sufficient, the land is flat, large and fertile, which is conducive to large-scale mechanized production, and the seeds produced are of good quality and High yield; Suwan germplasm is highly sensitive to light, resulting in long growth period and high plant height; this is a problem that has long plagued Southwest corn breeding and restricted seed production

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