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Method for improving photoperiod sensitivity of tropical maize germplasm

A photoperiod and maize technology, applied in the field of maize genetics and breeding, can solve the problems of assimilation and strong photoperiod response of very similar maize varieties, and achieve the effects of improving photoperiod sensitivity, compressing population size, and improving effective improvement.

Inactive Publication Date: 2015-06-24
FOOD CROPS RES INST YUNNAN ACADEMY OF AGRI SCI
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Problems solved by technology

[0009] The technical problem to be solved in the present invention is to overcome the defects in the prior art that the maize germplasm bred by importing tropical and subtropical germplasm into temperate zone germplasm mainly has a background of tropical maize germplasm and still has a strong photoperiod response, Therefore, it is still unable to solve the major production problems that the maize varieties widely promoted in northern my country are very similar and the assimilation of the varieties is very serious. The purpose is to provide a method that can effectively improve the photoperiod sensitivity of tropical maize germplasms

Method used

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  • Method for improving photoperiod sensitivity of tropical maize germplasm

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Embodiment 1

[0040] Embodiment 1 Breeding of photoperiod insensitive maize inbred line YML312 based on temperate germplasm background (method of the present invention)

[0041] Suwan 1 is a photoperiod-sensitive maize germplasm with an average growth period of about 130 days in temperate regions and a plant height of about 2.5m. It is resistant to leaf spot, highly resistant to downy mildew, and head smut. Lodging and drought resistance are strong.

[0042] LM1 is an extra-early-maturing hard-grain hybrid corn with a growth period of about 60 days and a plant height of about 1.3m.

[0043] see figure 1 The technical route shown, (1) material selection: improve the photoperiod sensitivity of the tropical maize germplasm Suwan 1 with the temperate early-maturing durum maize germplasm LM1 of the French Limagrain Company;

[0044] In the summer of 2008 in Kunming City, Yunnan Province, Suwan 1 was used as the female parent and LM1 was used as the male parent to prepare a warm-hot hybrid comb...

Embodiment 2

[0064] Breeding and testing (verification test) of the photoperiod insensitive maize hybrid combination YR556 and YR958 of embodiment 2

[0065] In the winter of 2012, 93 hybrid combinations were prepared in Xishuangbanna Prefecture, Yunnan Province, using the corn inbred line YML312 improved and bred by the method of the present invention.

[0066] In the summer of 2013, the photoperiod sensitivity and comprehensive performance of hybrid combinations were identified at multiple points in Dehong Dai and Jingpo Autonomous Prefecture of Yunnan Province (tropical), Kaiyuan City of Yunnan Province (subtropical zone) and Zhaotong City of Yunnan Province (temperate zone). The cycle-insensitive maize inbred line YML312 and the tropical maize inbred line YML461, the hybrid YR556, and the temperate maize inbred line YML339, the hybrid YR958, had no abnormality in three different ecological environments: tropical, subtropical and temperate. Obvious photoperiod response, in which YR556 m...

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Abstract

The invention discloses a method for improving the photoperiod sensitivity of a tropical maize germplasm, and belongs to the technical field of maize genetic breeding. The method comprises the following steps: improving the photoperiod sensitivity of a world-famous tropical maize germplasm Suwan 1 by using a temperate specially-early mature flint maize LM1 of the Limagrain company in France, 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 flint maize LM1 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 movement of maize varieties in the tropical zone and the subtropical zone in China.

Description

technical field [0001] The invention belongs to the technical field of corn genetics and breeding, in particular to a method for improving photoperiod sensitivity of tropical corn germplasm by using temperate corn germplasm. Background technique [0002] Maize originated in tropical and subtropical regions, and the critical length of sunshine is 12-13h, so it is a short-day crop (Emerson RA. A genetic view of sex expression in the flowering plants[J]. Science, 1924,59:176-182). Tropical and subtropical maize germplasm has many advantages such as well-developed root system, long green period, resistance to various diseases, drought and barrenness (Holland JB, Goodman MM. Combining ability of tropical maize accessions with US germplasm[J]. Crop Science, 1995,35:767-773), so it is an important germplasm basis for the expansion of maize germplasm in my country. However, tropical and subtropical maize germplasm has strong photoperiod sensitivity, and when directly introduced into...

Claims

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Application Information

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IPC IPC(8): A01H1/02
Inventor 番兴明刘丽陈洪梅徐春霞
Owner FOOD CROPS RES INST YUNNAN ACADEMY OF AGRI SCI
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