Method for cultivating aneuploid perennial forage grass variety by using corn heterologous polyploidy

Abstract

The invention discloses a method for cultivating an aneuploid perennial forage grass variety by using a corn heterologous polyploidy and belongs to the field of corn distant hybridization. According to the method, MTF-1 (Tripsazea creammaize T.2n=76) cultivated by Sichuan Agricultural University is used as a female parent and teosinte is used as a male parent to be hybridized; a filial generation is selected from perennials, a wintering habit, a tiller number, a chromosome number and chromosome constitution to select the perennial heterologous aneuploid forage grass variety. According to the method, firstly, a heterologous aneuploid is used as the forage grass variety to be applied so as to creatively expand an application range of corn affinis species and explore a novel way for utilizing corn affinis specie materials; secondly, a material cultivated by the method is used as a bridge material and has a very great application value; furthermore, a vegetative propagation manner can be used for fixing a hybrid vigor and the variety is perennial, so that the production cost is very low, the yield and the nutritive value are high, and the economic benefit is great.

Description

Technical field [0001] The invention belongs to the field of maize distant hybrid breeding, and specifically relates to a method for cultivating aneuploid perennial forage grass varieties by using maize allopolyploidy. Background technique [0002] Dawei grass and cultivated corn are different subgenus in the same genus or different subspecies in the same species. In the genus Gemus (Gemus Zea), in addition to the cultivated subspecies of corn (ssp.mays), the remaining seven species or subspecies are collectively called "Teosintes" (Teosintes). Among the maize relatives, the relationship between Daminaria and maize is the closest, and crosses with maize can obtain fertile offspring. Different types of wild grasses live in different ecological environments and have unique characteristics. They are the most direct outer gene pool for broadening maize germplasm resources. Among the big stalks, tetraploid perennial stalks (also known as tetraploid perennial corn) (Zea Perennis, 2n=...

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Problems solved by technology

[0008] It can be seen from the above that whether it is corn, tetraploid perennial teosinte or finger-shaped friction grass, they all have their own shortcomings when used as high-quality forage grass. For example, corn is an annual; The stems are aggressive, and the seeds are easy to fall off; the finger-shaped friction grass has low seed setting rate, dormancy, low seed germination rate, and poor palatability of grass quality; it seriously restricts the promotion and use of corn, teosinte and friction grass directly as forage grass

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