Hybrid rice mixed sowing seed production technology performed according to male and female parent grain shape difference

Abstract

The invention belongs to the technical field of japonica hybrid rice seed production, namely, a seed production technology of mixed sowing and mixed harvesting of BT type large-grain three-line nucleo-cytoplasmic interaction sterile lines and restoring lines with restoring genes. Firstly, small-grain varieties with the thousand kernel weight smaller than or equal to 15 g are directionally transformed into small-grain sterile lines or restoring lines with the thousand kernel weight smaller than or equal to 15 g through a traditional manual emasculation cross breeding method; secondly, medium-and-large-grain sterile lines or restoring lines with the thousand kernel weight larger than 25 g are selected to be matched with the small-grain sterile lines or the restoring lines with the thousand kernel weight smaller than or equal to 15 g, it is required that the sowing beginning duration period of the medium-and-large-grain sterile lines or the restoring lines is close to that of the small-grain sterile lines or the restoring lines newly transformed in the first step, and high-advantage combinations are screened from the matched sets; thirdly, when hybrid seeds are produced, male and female parent one-time hybrid direct sowing is performed, or after male parents and female parents are mixed and sown according to a certain proportion, transplantation, or seedling slinging, or mechanical transplanting or mixed harvesting is performed, grains pass a certain-hole-diameter sieve after harvesting, large-grain varieties are left in the sieve, and small-grain varieties pass the sieve.

Description

[0001] The invention belongs to the technical field of japonica hybrid rice seed production. That is, a BT-type large-grain three-line nuclear-cytoplasmic interaction sterile line and a restorer line with a restorer gene are mixed and harvested. Background technique

[0002] The yield increasing potential of hybrid rice is recognized in the world, but one of the most important restrictive factors is that it is difficult to produce a large number of hybrid seeds in economically developed countries like our country. Because the seed production of hybrid rice in my country mostly relies on manual operations, the process is complicated, and it is technology integration and labor-intensive work, which is difficult to apply to countries with developed economies and high degrees of mechanization. In my country, hybrid rice seed production technology has long been mature, but with the rapid development of the rural economy, the labor force continues to appreciate, resulting in the con...