Method for improving photoperiod sensitivity of tropical maize germplgasm yellow grain Tuxpeno

Abstract

The invention discloses a method for improving the photoperiod sensitivity of a tropical maize germplgasm yellow grain Tuxpeno. The method comprises the following steps: improving the photoperiod sensitivity of a tropical maize germplgasm yellow grain Tuxpeno B.P.C.15 by using a temperate specially-early mature dent maize germplgasm LM2, adopting a breeding selection method including processes of performing hybridization, mixed pollination, two-round back-crossing and continuous three-generation selfing, performing growth period and plant height selection as well as combining ability early generation test, and synchronously performing photoperiod sensitivity identification in a plurality of places in a tropical zone, a subtropical zone and a temperate zone, and especially continuously performing two rounds of back-crossing by taking the temperate specially-early mature dent maize germplgasm LM2 as a back-crossing parent so as to ensure that the proportion of a temperate maize germplasm can be increased, and a maize selfing line which takes a temperate maize germplasm background as the main and integrates the tropical germplasm characteristics and temperate germplasm advantages can be obtained. By adopting the method disclosed by the invention, the problem of photoperiod sensitivity commonly existing in a process of planting the tropical maize germplasm in a temperate area can be effectively solved; and the method also has important significance in promoting the northward migration of maize varieties in the tropical zone and the subtropical zone in China.

Description

technical field [0001] The invention belongs to the field of corn genetic breeding. In particular, it relates to improving the photoperiod sensitivity of the tropical maize germplasm Tuxpeno B.P.C.15 by using the temperate extra-early-maturing dent maize germplasm LM2 of the French Limagrain Company. Background technique [0002] The problem of narrow maize germplasm base has attracted worldwide attention. The narrow genetic base of germplasm and the lack of germplasm resources have become the primary limiting factors for the sustainable development of maize breeding research and production in my country. Tropical and subtropical maize germplasm is rich in genetic variation, and has stress resistance that many temperate zone germplasms do not have, such as well-developed root system, resistance to diseases and insect pests, high temperature resistance, strong drought resistance, etc. important germplasm resources. However, tropical and subtropical maize germplasms are sens...

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Problems solved by technology

[0008] The technical problem to be solved in the present invention is to overcome the prior art to introduce the tropical and subtropical germplasm into the temperate zone germplasm. The maize germplasm selected from the tropical maize germplasm background still has a strong photoperiod response, which cannot be solved. At present, the maize varieties promoted in large areas in northern my country are very similar, and the assimilation of the varieties is very serious. The major production problems, the purpose is to provide a method that can effectively improve the photoperiod sensitivity of the tropical maize germplasm Tuxpeno B.P.C.15

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