Breeding of a glume degenerated japonica sterile line and its application in indica-japonica hybrid rice
A breeding method and technology for three-line sterile lines, which are applied in the field of plant breeding, can solve the problems of difficulty in improving rice quality, high cost of seed production, and restrict the production and application of strong and excellent combinations, and achieve strong popularization and application value and grain filling degree. The effect of good, strong heterosis
Active Publication Date: 2015-08-19
山东笨笨农业科技有限公司
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Problems solved by technology
Indica-japonica inter-subspecies hybrid rice has stronger heterosis than indica-japonica intra-subspecies hybrid rice. With the three major obstacles of indica-japonica heterosis (late growth period, high plant height, poor seed-setting, that is, low seed-setting rate) Poor quality of indica and japonica hybrid rice and low yield of seed production due to flowering time difference become more and more prominent
The hybrid rice (indica non-japonica restorer) prepared by crossing the indica-type CMS line with the japonica-type restorer line can increase the seed production yield to a certain extent, but it brings more difficulty to the improvement of rice quality, and the rice quality is not as good as indica Not japonica, poor taste
However, the hybrid rice (japonica non-indica restorer type) prepared by the partial japonica CMS line and the partial indica restorer line has better rice quality than the indica non-japonica restorer hybrid rice, but the outcrossing characteristics of the japonica CMS line are poor. (stigma exposed rate is much lower than that of indica type), and the cost of seed production is high, which limits the production and application of some strong and superior combinations
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[0014] Combine below figure 1 Further explain the present invention with specific embodiment:
[0015] Take Jiangsu Fengyuan Seed Industry Co., Ltd.'s improved combination of glume degenerated cycle 422S / Zhenhui 42 as an example:
[0016] Such as figure 1 As shown, the specific cultivation and application methods are as follows:
[0017] 1) In the winter of 2004, the female parent of Samsara 422S was crossed with the glume degenerated mutant as the male parent to obtain F 0 50 seeds;
[0018] 2) In the first season of 2005, F was planted in Jurong, Jiangsu 1 Generation of 20 plants, mixed harvest of 250 grams of seeds after removal of impurities;
[0019] 3) From the winter of 2005 to the spring of 2006, plant F in Lingshui, Hainan 2 generation. At the heading stage, use reincarnation 422S female parent, select 25 fertile plants with degraded glume and good comprehensive agronomic characteristics as the male parent, and select rice grains that are plump and strong at th...
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The invention belongs to the field of seed selection technology for plant variety, and provides a method for breeding sterile line japonica rice with degenerated inner glume and a method for using the same in indica-japonica hybrid rice; the method uses an inner glume degenerated characteristic which is controlled by a single recessive gene from natural mutation, and the characteristic is directionally transferred into the sterile line japonica rice, thereby the sterile line can accept the restorer pollen of indica rice in open type, so the seed propagation and production output of sterile line japonica rice can be substantially improved. Simultaneously, inter-subspecific hybrid rice prepared by sterile line japonica rice with degenerated inner glume and indica-cline type restorer has the advantages of good fullness of grain and good taste value.
Description
technical field [0001] The invention relates to a plant breeding method, more specifically to a method for cultivating a glume degenerated japonica sterile line and its application in indica-japonica hybrid rice. Background technique [0002] Rice is the largest crop in my country. There are two main subspecies of rice cultivated in China, namely the indica subspecies and the japonica subspecies. Indica-japonica inter-subspecies hybrid rice has stronger heterosis than indica-japonica intra-subspecies hybrid rice. With the three major obstacles of indica-japonica heterosis (late growth period, high plant height, poor seed-setting, that is, low seed-setting rate) The problem of poor quality of indica-japonica hybrid rice and low yield of seed production due to flowering time difference has become more prominent. The hybrid rice (indica non-japonica restorer) prepared by crossing the indica-type CMS line with the japonica-type restorer line can increase the seed production yie...
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IPC IPC(8): A01H1/02
Inventor 林添资余波龚红兵钱华飞景德道盛生兰周义文李闯曾生元
Owner 山东笨笨农业科技有限公司