Select breeding method of new germplasm of green mowing sorghum sudanense

Abstract

The invention provides a select breeding method of a new germplasm of green mowing sorghum sudanense. The select breeding method comprises the following steps: assembling F0 generation, namely carrying out artificial assembly cross combination by taking Jumbo Gaodan grass coeno-species as the female parent and sorghum sudanense breed of new su number 2 as the male parent to obtain F1 generation coeno-species seeds; selecting F1 generation, namely creating a limit water environment and mainly screening drought resistance-excellent single plants; selecting F2 generation, namely creating an enough water environment and mainly screening disease resistance single plants; selecting F3 generation, namely continuously carrying out plus generation selection under an F1 limit water condition and planting according to head progeny rows, wherein the number of offspring groups of each material is not less than 300; selecting F4-F6 generations, namely respectively carrying out a new round of drought and water alternate directional selection according to a selective sequence of F1-F3 generation offspring materials; and harvesting F7-F8 generations, namely harvesting according to strains, completing stability and adaptability evaluation survey records of two generations of new strains, and arranging breeding tests in a small area under an isolation condition to finally obtain a batch of new germplasm of the green mowing sorghum sudanense.

Description

technical field [0001] The invention relates to a method for breeding new germplasm of green mow sudan grass, which belongs to the technical field of forage grass variety selection and breeding. Background technique [0002] Sudan grass (Sorghum sudanense) is an annual high-quality forage grass belonging to the family Sorghum. It is native to the Sudan Plateau in northern Africa and is widely cultivated in countries all over the world. It has the characteristics of strong drought resistance, wide adaptability, and good palatability. The quality of its stems and leaves is softer than that of silage corn and sorghum. It is known as the "king of green feed for fish farming". In the research on Sudan grass breeding technology, foreign countries mainly focus on the cross breeding of Sudan grass, sorghum and sweet sorghum, and mostly focus on the breeding of disease resistance, cold resistance and forage quality. Since the 1990s, my country has paid attention to the research on S...

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Problems solved by technology

Since the 1990s, my country has paid attention to the research on Sudan grass breeding technology. Min Jichun et al. adopted the systematic breeding method to select and breed Xinsu No. 2 Sudan grass based on indicators such as growth period, seed glume color, and panicle traits; Wang Zhen et al. According to the seed color, Sudangrass No. 1 was bred from the natural hybrid Sudangrass population; Yu Zhuo et al. used the single plant selection method to select for fast growth in the early stage, strong and tall plants, many tillers, and panicle type between the parents. The goal is to breed Mengnong Qingsi No. 2 Sudan grass; Yi Jin et al. proposed that the breeding of Sudan grass should be based on the combination of high yield, shatter resistance, mowing resistance, strong regeneration, dwarf lodging resistance, and cold resistance. The traits are the main target, but the selection criteria for each target are not clear; Wang Yunwen concluded that the number of days of growth, the number of nodes on the main stem, the diameter of the stem, and the number of tillers per plant affect the nutritional quality of Sudan grass

And the varieties that have been selected focus on seed production and hay processing, but there are no relevant reports on the breeding technology of new sudangrass germplasm that is suitable for green mowing, strong tillering and regeneration, high quality and high yield, which seriously restricts The scale and speed of development of grass-fed livestock and fish farming in the South

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