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Method for space mutation breeding of maize strong heterosis cross combination parent

A technology of hybrid combination and space mutagenesis, which is applied in the fields of botany equipment and methods, application, plant gene improvement, etc., can solve the problems of generation length, etc., and achieve the effects of accelerating breeding, improving improvement efficiency, and shortening the number of years

Inactive Publication Date: 2013-08-21
SICHUAN AGRI UNIV
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Problems solved by technology

[0003] In the prior art, there is a backcrossing method to improve corn inbred lines, but this technology generally requires 5 to 6 generations of backcrossing, so that the main traits of the offspring can be close to the recurrent parents, and the required generations are longer

Method used

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Embodiment Construction

[0014] The technical solutions of the present invention will be further described below through specific embodiments.

[0015] The seeds on the same ear of the maize inbred line S37 were divided into two, one was kept on the ground as a control, and the other was used for returning satellite carrying treatment.

[0016] In the first year, the seeds that returned to the ground were planted in Yunnan, single seed sowing, seedling raising and transplanting, without thinning, and the grown plants were the first generation of space mutagenesis (SP1), self-pollination, and single plant harvesting; Maize inbred line S37 was used as a control.

[0017] In the spring of the second year, the harvested SP1 seeds were planted in rows in Sichuan, and the grown plants were the second generation of space mutagenesis (hereinafter referred to as SP2). The seedlings were raised and transplanted, and each SP1 ear was planted in 4 rows, and every 12 rows were planted in 2 rows. control. Excelle...

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Abstract

The invention discloses a method for space mutation breeding of a maize strong heterosis cross combination parent. The method includes the steps of: using a recoverable satellite to carry a maize inbred line or hybrid; recovering the primary seed and conducting monoseeding without thinning out seedlings, and performing selfing totally; subjecting a first generation of selfing to ear row planting, first selecting a good ear row, then selecting a good single plant from the good ear row to undergo selfing; increasing the planting group of a second generation of selfing, increasing the selection pressure, and further carrying out optimum selecting from the best to perform selfing; for a third generation of selfing, employing diallel crossing to prepare a combination, and letting a mutant line undergo selfing continuously; and identifying the cross combination by multipoint planting, and selecting mutant strains with good comprehensive performance and the cross combination with high specific combining ability through combining ability analysis. By improving the prior art, the method provided in the invention shortens, improves the period of inbred lines, and accelerates breeding of new varieties.

Description

technical field [0001] The invention relates to a method for plant variety breeding, in particular to a method for selecting parents of strong dominant hybrid combinations of maize by using space mutagenesis. Background technique [0002] The genetic basis of germplasm resources is increasingly narrow, which has become a key factor that seriously restricts the improvement of maize breeding yield. The traditional breeding and improvement methods of maize inbred lines have a long cycle and are difficult to improve a single trait. Space mutation breeding is a new product of the combination of aerospace technology and crop breeding technology. It is an important way to broaden the germplasm base and enrich germplasm resources. It can create rare genetic resources that are difficult to obtain in nature in a short period of time. It plays an important role in today's plant breeding by creating conditions for the breeding of breakthrough new varieties. At present, it has been suc...

Claims

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Application Information

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IPC IPC(8): A01H1/02A01H1/04
Inventor 曹墨菊荣廷昭潘光堂张采波兰海汪静卢艳丽胡尔良
Owner SICHUAN AGRI UNIV
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