A kind of breeding method of early maturing medium 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 method for selecting and breeding early-maturing medium-maturing rice varieties, which belongs to the technical field of plant breeding, and is specifically dedicated to selecting new early-maturing medium-maturing medium-maturing rice varieties. Background technique [0002] Rice is the most important food crop in our country. China has the world’s leading achievements in rice breeding. Rice breeding has experienced 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; "Hybrid rice" as a symbol, through the rapid development of three-line or two-line hybrid rice, the average rice yield per mu in China has increased to 400 kg; the third time is represented by the "super rice variety", the national average rice yield has reached 450 kg per mu , The yield potential exceeds 800 kg / mu. In recent years, the global climate has been abnormal,...

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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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