Method for creating high-yield multi-resistance corn inbred line suitable for northern latitude 33-degree region

Abstract

The invention discloses a method for creating a high-yield multi-resistance corn inbred line suitable for a northern latitude 33-degree region, which comprises the following steps: (1) on the basis of local eurytopic germplasm, respectively hybridizing with European and American density-tolerant high-yield germplasm and germplasm with a tropical stress-resistant background to obtain two groups of F1 hybrid clusters; (2) mixing the two groups of F1 hybrid clusters with powder, hybridizing 200 clusters, selecting 100 clusters conforming to target traits, and mixing to form double-cross F1 seeds; (3) selecting 200 double-cross F1 seeds to hybridize with local germplasm to obtain hybrid seeds, and constructing S0 seeds; (4) carrying out mixed planting on the S0 seeds, constructing an S0 group, and carrying out selective selfing according to a character target; and (5) planting the selfing clusters obtained by optimization in the step (4), carrying out nine generations of selfing purification and generation-crossing combining ability determination selection according to a pedigree method, optimizing clusters with stable characters, and threshing to obtain a high-yield eurytopic multi-resistance corn selfing line material which gathers local high-quality germplasm, European and American density-resistant high-yield and tropical stress-resistant germplasm aggregation.

Description

Technical field: [0001] The invention relates to a method for creating a high-yield multi-resistance maize inbred line suitable for an area at 33 degrees north latitude, and belongs to the technical field of new agricultural varieties breeding. Background technique: [0002] The area at 33 degrees north latitude is the area with the greatest potential for grain production in my country, and it is distributed in the five provinces of Jiangsu, Anhui, Henan, Hubei, and Sichuan. The main corn production area in Anhui Province belongs to the area at 33 degrees north latitude, with a perennial planting area of ​​15 million mu and an average yield of 400kg / mu, occupying an important position in grain production. The state has put forward the strategy of "storing grain on the ground and storing grain on technology", the trend of centralization of major grain production areas has been further strengthened, and the pressure on production capacity has increased. The main maize product...

AI Technical Summary

Problems solved by technology

In view of the characteristics of high temperature, high humidity, and susceptibility to disease in the late stage of maize production and growth in Anhui Province, maize varieties with a single germplasm source can no longer adapt to the current environmental changes

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