High-altitude seed production method for two-line sorghums

Abstract

The invention discloses a high-altitude seed production method for two-line sorghums. In summer and autumn, seeds are produced in areas around which no other species of sorghums are planted within 500 meters in districts with the altitudes of 1,000 to 1,800 meters in order to meet light-temperature weather conditions that stable sterility of a two-line sorghum seed production female parent is guaranteed and safe grouting maturing can be realized after the female parent is pollinated. The high-altitude seed production method comprises the specific steps of a, sowing seeds in the late April to the mid-May, wherein during sowing, male seeds and female seeds are sowed every 5 to 20 days, the sowing density is that 1 to 2 strains are retained in each hole, and a method for drip irrigation under mulch is adopted to irrigation; b, removing weeds, and performing artificial supplementary pollination; and c, performing field management and standardized cultivation. According to the high-altitude seed production method for the two-line sorghums, the seeds can be sold in the market early by 3 to 4 months, so that the seed production risk is reduced, and the pest diseases to crops are relieved; in the earing and flowering stage of the sorghums, the rainfall is low, and the air humidity is low, so that pollination is facilitated; the day-and-night temperature difference is large, thus grouting is facilitated, and the seed production yield is greatly increased; the production cost is lowered, and the seed production benefit is enhanced.

Description

technical field [0001] The invention belongs to the field of hybrid sorghum seed production, in particular to a two-line sorghum high-altitude seed production method. Background technique [0002] The use of heterosis in sorghum, since the first cytoplasmic male sterile line TX3197A was bred in the United States in the 1950s, the three-line method is mainly used in the world. The utilization of sorghum heterosis in the two-line method is based on the three-line method, omitting the maintainer line, and relying on the temperature- and light-sensitive characteristics of the dual-purpose sterile line of sorghum, that is, it is fertile under certain temperature and light conditions. It is used for self-propagation and reserved seeds; it is sterile under another temperature and light condition, and is used for hybridization with restorer lines to produce first-generation hybrid seeds. In 1993, India reported the discovery of sorghum photothermosensitive cytoplasmic male sterile ...

AI Technical Summary

Problems solved by technology

However, in the process of using dual-purpose sterile lines for winter seed production, there are still the following problems: 1. Because of winter seed production, the seeds cannot be harvested until the middle and early March of the following year, and most areas in the south will not be able to harvest seeds until late March to mid-March. Sowing starts in early April, and the time available for planting is short, which is not conducive to seed sales; 2. In the early stage of winter seed production, it is very vulnerable to typhoon storms, which will cause seedlings to be destroyed and flooded, and the risk of seed production is high; 3. Due to the high temperature all year round , diseases and insect pests are serious and difficult to prevent and control, which affects the yield and quality of seeds in seed production; 4. Due to the continuous increase in land rent and labor prices, the cost of seed production is high and the benefits are low

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