Wheat interspecific distant hybrid, secondary backcross and selfing breeding method

Abstract

The present invention provides a wheat breeding method, including interspecific distant hybridization, secondary back cross and self-cross. Said method includes the following several procedures: a), parents selection; b), distant hybridization; c), hybridization combination and fertility identification; d), backcross; and e) self-cross. Besides, said invention provides the concrete steps and requirements of the above-mentioned every procedure.

Description

technical field [0001] The invention relates to a breeding method of distant hybridization, secondary backcrossing and self-crossing among wheat species to create germplasm with high thousand-grain weight of wheat, which belongs to the field of crop genetic breeding research. Background technique [0002] Wheat intraspecific hybridization (or inter-variety hybridization) has achieved fruitful results in exploring yield potential, which has greatly promoted the progress of agricultural production. However, due to the fact that the utilization of genetic resources of wheat cultivars has become increasingly saturated in recent years, and many improved varieties have the same or similar parental sources, the narrow genetic background has led to the current level of wheat yield has been hovering. To further increase the yield potential of wheat, it is necessary to find new ways to create and utilize new materials and germplasm with rich variation, and to introduce beneficial exog...

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Problems solved by technology

97119858 patent "increasing ear and increasing grain nutrient" discloses a kind of Chinese herbal medicine nutrient solution plant growth regulator, and also has (Yu Songlie etc., 1988) the method for spraying liquid fertilizer such as " potassium dihydrogen phosphate " on wheat, can improve 1,000-grain weight 1 -2g, but these two methods only regulate the growth of wheat physiologically, and the effect is only shown in the current year, and it will increase production costs such as the purchase of chemicals, field spraying operations, etc.

[0004] In addition, there are also reports of distant hybridization between common wheat and durum wheat (Zhong Guanchang et al., 2002), but the parents selected by them are F 1 Self-fertilization is fertile, with a seed setting rate of 42-48%, and only one cross between common wheat and durum wheat is used for breeding, that is, common wheat × durum wheat, that is to say, the use of "F 1 Distant heterosis” was directly used for variety breeding, so the thousand-grain weight of the selected wheat germplasm failed to exceed 45g

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