Breeding method of maize inbred line S37

Abstract

The invention relates to a breeding method of maize inbred line S37, and belongs to the technical field of agricultural science. The breeding method comprises the following steps: (1) using Shen 137 as a female parent and MO17 as a male parent for hybridization to obtain an F1 generation of Shen 137 / MO17; (2) inbreeding the F1 generation to obtain an F2 generation of Shen 137 / MO17; (3) using an early-maturing density-resistant material FR3 as a female parent and the F2 generation of Shen 137 / MO17 as a male parent for hybridization to obtain the F1 generation of FR3 / Shen 137 / MO17; (4) selecting excellent individual plants from the F1 generation of FR3 / Shen 137 / MO17 as the female parent, using the early-maturing density-resistant material FR3 as the female parent for backcrossing to obtain the F1 generation of FR3 / FR3 Shen 137 / MO17; (5) continuously inbreeding the F1 generation of FR3 / FR3 Shen 137 / MO17 for six generations to breed the maize inbred line S37. The S37 bred according to the method provided by the invention has the advantages of high combining ability, moderate growth period, good plant type, good density resistance, high disease resistance and wide adaptability, has become one of excellent inbred lines commonly used in our country, and is an important basic material for the improvement of maize inbred lines and the hybridization breeding in the future.

Description

technical field [0001] The invention belongs to the field of agricultural science and technology, and in particular relates to a breeding method for a corn inbred line S37. Background technique [0002] In the 1980s, maize large leaf spot, gray leaf spot and curvaceous leaf spot were widespread, and compact and semi-compact maize varieties such as Danyu No. 13 and Yedan No. 13, which were widely popularized, were severely susceptible to the disease. Exit production. Since the 1990s, my country has introduced germplasm containing tropical blood from abroad, and then selected a number of germplasms with high productivity per plant, resistance to leaf spot disease, and dense leaves. It has an effective inhibitory effect on maize leaf spot diseases, but the disadvantage is that the ripening period is late. And with the change of the physiotype of the disease and the extension of the application time, the single-gene resistance alone cannot last. After entering 2000, domestic ...

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Problems solved by technology

However, it was found in production that increasing the density not only brought serious diseases, but also made lodging more and more serious, which had a huge impact on yield

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