Breeding method of early-maturity middle japonica rice variety

Abstract

The invention relates to a breeding method of an early-maturity middle japonica rice variety, and belongs to the technical field of plant breeding. The breeding method comprises: using Yanfeng 47 as a female parent and Xudao No.3 as a male parent to perform artificial hybridization matching in Yancheng of Jiangsu province to obtain F0 seeds, planting the seeds in Sanya of Hainan province in winter of the same year, and performing mixed harvesting of F1 seeds at maturity; performing mixed line planting of generations F2 to F5 in Dandong of Liaoning province, Yancheng of Jiangsu province, Dandong of Liaoning province, and Yancheng of Jiangsu province respectively, planting two parents at the same time for each generation as control, and performing mixed harvesting of seeds at maturity, wherein the maturity period of selected individual plants was between that of the two parents, and other characters are similar to that of conventional breeding; planting a strain identification nursery of the generation F6 in Yancheng, and breeding the generation F7 into a new early-maturity middle japonica rice variety 'Yandao 200', which matures 7-8 days earlier than Xudao No.3 in Jiangsu. The yield, resistance, quality and other indexes of the early-maturity middle japonica rice variety conform to the standard of rice variety approval above the provincial level.

Description

technical field [0001] The invention relates to a breeding method for early-maturing medium-maturing japonica rice varieties, which belongs to the technical field of plant breeding, and is specifically used for breeding new early-maturing and medium-maturing japonica rice varieties. Background technique [0002] Rice is the most important food crop in my country. my country has the world's leading achievements in rice breeding. Rice breeding has undergone three major leaps. The first is the high-stalk to short-stalk breeding technology, which has increased the average rice yield from 100 kg to 300 kg; the second is the "conventional rice to "Hybrid rice" as a symbol, through the rapid development of three-line or two-line hybrid rice, the average yield of rice per mu in my country has risen to 400 kg; the third time is represented by "super rice varieties", and the average yield of rice per mu in China has reached 450 kg , The yield potential exceeds 800 kg / mu. In recent yea...

AI Technical Summary

Problems solved by technology

At present, medium-maturing medium-maturity japonica rice varieties used in large-scale rice production in Jiangsu generally have the defect of long growth period, and their late growth period, especially the mid-to-late period of grain filling, is easily affected by low temperature, drought or flood, resulting in a significant decline in yield; Influenced by other factors, the rice varieties in northern my country are planted in the middle japonica rice area of ​​Jiangsu, and their whole growth period is too short, resulting in low yield.

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