A kind of breeding method of green super rice

Abstract

The invention discloses a breeding method of green super-rice. The method comprises the following steps: (1) taking rice parents for hybridization, to obtain an F1 generation; (2) performing selfing and back-crossing to the F1 generation to obtain a F2 generation and a BC1F1 generation; (3) placing the F2 generation or the BC1F1 generation in a natural stress environment for breeding, and screening according to target characters to obtain target single plant; (4) repeating the steps (2) and (3) until the single plant with stable characters is obtained. According to the method, the conventional breeding method and a multi-factor natural stress environment are combined, rice is not subjected to stress screening of water irrigation, fertilizer application and pesticide spraying environments after being transplanted, high-yield, drought-resistant, low fertilizer-resistant (efficient utilization of the fertilizer) and disease and pest-resistant green super-rice can be obtained through matching the screening of target characters; and the rice material obtained by adopting the breeding method has the characteristics of being high-yield, drought-resistant, low fertilizer-resistant (efficient utilization of the fertilizer) and disease and pest-resistant, and the hereditary character is stable.

Description

technical field [0001] The invention relates to the technical field of breeding of new agricultural varieties, in particular to a method for breeding green super rice. Background technique [0002] Rice is one of the most important food crops in the world and plays an important role in food security. In the past more than half a century, breeders have bred many excellent varieties through conventional breeding methods such as dwarf breeding and heterosis utilization, which have greatly improved rice yield. However, rice production still faces challenges due to the growing world population and decreasing cultivated land area. [0003] As one of the 13 most water-scarce countries in the world, agricultural production consumes 70% of my country's freshwater resources, and rice production accounts for 70% of agricultural water consumption, and my country's grain production area is less than 10% of the world's, consuming more than 30% % pesticides and fertilizers. Aiming at the...

AI Technical Summary

Problems solved by technology

However, the usual conventional breeding needs to identify the characteristics of drought tolerance, low fertilizer tolerance (high efficiency utilization of nitrogen and phosphorus), resistance and yield of rice breeding materials through the construction of corresponding transfer facilities; drought tolerance; selecting a special low-fertility land to identify the high-efficiency absorption and utilization of nitrogen and phosphorus of rice materials, etc., not only requires a lot of investment, but also cannot identify multiple shapes at the same time

Compared with conventional breeding, molecular breeding has obvious advantages such as easy gene detection. It can aggregate good genes from different sources and improve rice varieties in a targeted manner. Gene control requires more fine-tuning and cloning of gene loci, and the construction of a tight linkage map of molecular markers. At present, there are still insufficient efforts to mine genetic resources, few practical molecular markers and genes with breeding value, and molecular marker-assisted selection. The disadvantages of accuracy and cumbersome methods

Therefore, the current molecular design breeding is only used to aggregate multiple resistance genes or identify some traits that are difficult for breeders to directly distinguish, and it is extremely rare to truly use molecular marker-assisted selection to breed varieties

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