Breeding method of high-quality lodging-resistant long-grain japonica rice

Abstract

A method for breeding high-quality lodging-resistant long-grain japonica rice, comprising the steps of: (1) hybridizing Wuyujing 12 as the female parent and Sidao 690 as the male parent; (2) using the hybrid in step (1) as the female parent, multiplying 516 was backcrossed as the male parent, and after 3 years and 6 generations, the line 10fan 741 was bred; (3) Wuyunjing 19 was used as the female parent, and the line 10fan 741 was used as the male parent, and a single plant was continuously added in local and remote places Selection, 48 long-grain japonica rice lines were bred; (4) The 48 stable lines bred were sowed in a small area, and 26 lines with strong lodging resistance and good resistance to rice blast were finally selected; (5) 26 lines were selected Indoor seed testing, steaming and tasting, and 12 excellent materials were finally selected for off-site propagation; (6) The 12 high-quality materials that were multiplied in off-site were tested for comparison, rice blast inoculation identification, and the retained yield was 5% higher than that of the control variety There are 2 strains, Si 15‑301 and Si 17‑16. The japonica rice variety bred by the invention has long aggregate grain shape, strong lodging resistance, high yield, good appearance quality and good cooking and eating properties.

Description

technical field [0001] The invention belongs to the technical field of improved varieties, and in particular relates to a breeding method for high-quality lodging-resistant long-grain japonica rice. Background technique [0002] Since the 1950s, Chinese rice breeding has experienced three revolutions, namely rice dwarf breeding, three-line hybrid rice breeding, and two-line hybrid rice breeding, of which the two-line hybrid rice breeding coincides with super rice breeding. Driven by the rice breeding revolution, the yield per unit area of ​​rice in China has continued to increase. Since the 1960s, China's rice yield has increased by 228%, with an average annual compound growth rate of 1.56%. At present, China's rice production technology and production level are at the forefront of the world. It is expected that resistance and rice quality upgrading will become a breakthrough for the fourth-generation rice varieties in China's rice breeding. [0003] The area of ​​rice in ...

AI Technical Summary

Problems solved by technology

[0004] With the change of farming system, the cultivation area of ​​light and simplified direct-seeding rice is increasing, the root system of direct-seeding rice is shallow, and the lodging resistance is poor

It brings about three outstanding problems: one is to affect the yield of rice, the other is to increase the cost of harvesting, and the third is to affect the quality of rice

In particular, the third problem has greatly affected the brand awareness of the Jiangsu rice market, leading to an increasing gap between "Jiangsu rice" and the "long-grain fragrant" rice in the Northeast, and the problem of "strong rice and weak rice" in Jiangsu has become more and more obvious