Breeding method for rice with high and stable resistance to rice blast

Abstract

The invention discloses a breeding method for rice with high and stable resistance to rice blast. By means of high-density direct seeding of F2 in the earlier stage, construction of rice blast resistant hybridized combinations, induction of rice blast with an environmental induction method and quantitative seeding of F3, the hybridized combination with rice blast resistant potential is effectivelyscreened, screening workload is reduced, and breeding effect is improved; furthermore, seedling cultivation density has no difference in the seedling stage, influence of cultivation density on rice blast induction is reduced, and single-plant rice blast resistant breeding effect is improved; by the aid of all-region planting, induction and screening of the rice blast resistant combination, loss of horizontal resistance resource of rice blast is prevented, and the combination has general and stable resistance to physiological strains; resistance level of the selected rice combination to localdominant physiological strains is improved through vertical disease resistance screening, and characteristics of stable resistance is further improved under inoculation identification of the local dominant physiological strains of rice blast; besides, under the action of medium optimization, callus differentiation and cell division are effectively promoted, and anther-culture breeding efficiency is improved.

Description

technical field [0001] The invention relates to rice breeding technology, in particular to a rice breeding method with high and stable resistance to rice blast. Background technique [0002] Rice is the main food crop of our people. With the improvement of people's living standards and the continuous trend of increasing population and decreasing cultivated land, increasing rice production and increasing stable supply have been the key issues that my country's rice breeding has been working on for a long time. It is the most effective and economical way to increase rice yield by using excellent germplasm resources for high-yield and stable-yield breeding. [0003] Rice blast is a fungal rice disease. It is listed as the three major diseases of rice along with bacterial blight and sheath blight. Rice blast is widely distributed. The annual occurrence area of ​​rice blast in my country is more than 3.8 million hectares, and the annual loss of rice is hundreds of millions. ...

AI Technical Summary

Problems solved by technology

[0005] However, when a variety with this type of vertical resistance is promoted on a large scale, it is easy to cause the physiological race that infects it to rise to the dominant race, so that the vertically resistant variety is infected and eliminated, and the resistance of the disease-resistant variety The disease cannot be maintained stably and persistently

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