Hybrid rice seed production method of synchronous-transplanted parent plants

Abstract

The invention relates to a hybrid rice seed production method of synchronous-transplanted parent plants. The method is characterized by comprising the following steps: simultaneously sowing maternal plants I and paternal parents I; sowing paternal parents II, wherein sowing time of the paternal parents II is later than that of the paternal parents I by 5 to 7 days; after rice seedlings grow out, simultaneously transplanting maternal plant rice seedlings and paternal parent rice seedlings of two stages into the same seed production field; carrying out artificial supplementary pollination when paternal and maternal plants are earing and blooming; collecting seeds from the maternal plants, so as to obtain seeds, i.e., hybrid rice seeds. According to the seed production method provided by theinvention, paternal parent rice seedling raising of two stages is carried out firstly, and then, the paternal parents of two stages and the maternal plants are transplanted in the seed production field together, so that on one hand, the overall blooming period duration of the paternal parents is prolonged in effect, and a blooming period of maternal plants with a relatively un-concentrated blooming period can completely fall into the range of a blooming period of paternal parents with a relatively concentrated blooming period without severely requiring that blooming periods of the paternal andmaternal plants in a hybrid rice seed production combination are closely coincided. On the other hand, manual operations are greatly reduced, both sowing and rice seedling transplanting can achieve complete mechanization, and thus, labor cost is reduced greatly.

Description

technical field [0001] The invention relates to the fields of hybrid rice breeding and seed production, and more particularly relates to a hybrid rice seed production method for simultaneous transplanting parents. Background technique [0002] Rice is the main food crop in China. At present, the annual rice planting area is about 430-440 million mu, of which the annual planting area of ​​hybrid rice is about 220 million mu, accounting for more than 50% of the total rice area, which is a major contribution to China's rice production and food security. made a great contribution. [0003] The principle of hybrid rice is to select two rice varieties that have certain differences in genetics and can complement each other in their excellent traits, and carry out hybridization, and the first-generation hybrids obtained have heterosis. The use of first-generation hybrids in agricultural plantings yields good yields in terms of both stress resistance and yield. Seeds obtained by se...

AI Technical Summary

Problems solved by technology

[0005] However, on the one hand, these methods greatly increase the workload of seed production farmers, and on the other hand, they are also subject to human factors (such as errors in seeding design, inaccurate flowering prediction, too many or too few parent seedlings, improper field management, etc.) and The impact of non-human controllable factors (such as weather, pests and diseases, soil moisture content, etc.)

[0006] In addition, even if the combination of parents with similar sowing start period is screened out, the stigma of some female parents may not be effectively pollinated because the flowering period of the male parent is shorter than that of the female parent.