Method for breeding ultrahigh-yield eurytopic wheat

Abstract

The invention discloses a method for breeding ultrahigh-yield eurytopic wheat. The method provided by the invention comprises the following steps of: hybridizing disease-resistant wheat serving as a female parent and No.924402 wheat serving as a male parent, and obtaining destination wheat by screening, wherein the destination wheat is one of the following (a) to (f) wheat: (a) wheat, the yield, the lodging resistance and the stress tolerance of which are higher than those of No.14 Lu wheat; (b) wheat, the yield of which is higher than that of No.14 Lu wheat or No.19 Ji wheat or No.4185 Shi or No.8 Jingdong; (c) wheat, the lodging resistance of which is higher than that of No.14 Lu wheat; and (d) wheat, the stress tolerance of which is higher than that of No.14 Lu wheat or No.4185 Shi or No.4589 Han. Proved by experiments, the stable yield and the eurytopic property are enhanced by parent creation, hybridization and recombination, separate generation shuttle selection, alternate flood and drought selection and multi-point identification of set strains; and a new wheat variety is obtained.

Description

technical field [0001] The invention relates to the field of plant breeding, in particular to a method for breeding super-high-yielding broad-fit wheat. Background technique [0002] Wheat is an important food crop in my country, and its output and consumption account for about 22% of the country's total grain, and it plays a pivotal role in agricultural production and the national economy. Due to the fact that our country has a lot of people and little land and the continuous reduction of land, the contradiction between supply and demand of wheat is becoming more and more prominent. To meet the increasing demand of wheat consumption, wheat yield must be increased, and the breeding of high-yield and super-high-yield wheat varieties is the simplest and most effective way to increase yield. According to statistics, new varieties contribute the most to the improvement of my country's wheat production, reaching 30.9%, with an average annual contribution rate of about 1%. Each w...

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Problems solved by technology

[0003] The factors that plague the improvement of wheat production in China can be summarized into three aspects: first, the contradiction between high yield and lodging. With the improvement of soil fertility and the increase of chemical fertilizer application, the population of wheat continues to increase, and lodging has become a major obstacle restricting the promotion of high-yielding varieties. Lodging not only significantly reduces production, but also greatly increases harvesting costs, especially when the proportion of wheat harvested by machine is rapidly expanding; the second is the contradiction between high yield and wide adaptability, and the varieties used in production, especially high-yield varieties, are sensitive to environmental and climatic conditions. , showing poor adaptability. With the increasing frequency and degree of various biotic and abiotic stresses, this situation is particularly prominent, which seriously limits the large-scale planting of high-yielding varieties. Although super-high-yielding varieties (lines) have ultra-high-yield records, However, there is no planting area or the area is very small; the third is the contradiction between high yield and premature aging. Wheat often encounters dry and hot wind damage in the later stage of growth. High-yielding wheat varieties have premature aging and high-temperature ripening from time to time, which seriously affects the fullness of the grain and the yield potential of the variety. However, high-yield wheat mostly pays attention to the early selection, ignoring the late selection, especially the selection at the maturity stage, which further aggravates the occurrence of premature aging and the harm of dry and hot wind

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