Breeding method of thermally stable quality wheat

Abstract

The invention provides a breeding method of thermally stable quality wheat. The breeding method is provided based on the fact that different quality parameters selected as thermal stability test parameters from wheat generations are suitable for accurately reflecting quality thermal stability of wheat varieties.

Description

technical field [0001] The invention relates to a wheat breeding method, in particular to a wheat breeding method with quality and heat stability, and belongs to the field of agricultural breeding. Background technique [0002] Dry hot wind is a kind of dry and hot wind that occurs during the grain filling period of wheat grains and causes damage to wheat grains in milk maturity stage, among which high temperature stress is the most important factor. Since the middle of the 20th century, we have witnessed the consequences of global warming, which are likely to continue to increase in frequency and severity, with the frequency and severity of extreme heat events, sea level rise, and loss of Arctic sea ice. High temperature stress damages a large area and seriously affects wheat yield and quality. Studies have shown that every 1°C increase in global temperature will lead to a 4.1%-6.4% decrease in wheat yield. In 2018, moderate to severe dry hot winds appeared in the late stag...

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Problems solved by technology

Sun Qixin et al. found that varieties with more stable thousand-grain weight may have stronger heat tolerance under thermal stress, and proposed an index of grain weight thermal sensitivity index, which can reflect the sensitivity of crop traits to thermal stress and the stable yield of the tested materials. It is more intuitive to apply to the screening of wheat heat-resistant germplasm materials, but the index of quality heat stability is not indicated

[0004] In the prior art, there are many quality parameters that characterize the quality of wheat. At the same time, we also found that different quality parameters have different effects after being affected by heat at different stages of wheat growth. For example, for a certain heat Wheat varieties with poor stability, in which a certain quality parameter will show poor heat stability only when measured at a specific period, while in other growth periods, even if subjected to heat stress, this quality parameter is not as good as that without heat stress. Therefore, if the measurement is not carried out in the appropriate growth period, the measured changes in thermal quality parameters will also be inaccurate, that is, it cannot truly reflect the thermal stability of the wheat variety

This makes it difficult to select which quality parameters to study and at what stage to measure quality parameters in the evaluation of wheat thermal stability

At the same time, in the process of wheat breeding, it usually takes several generations to select the final heat-stable variety, but it is uncertain which quality parameter will be tested in which generation, and the determination of the quality parameter and the quality parameter measurement time is The key step of cultivating heat-stable wheat varieties, that is, if incorrect quality parameters are detected in inappropriate generations, whether the characteristics change may not be able to represent the heat stability of the variety. This application is addressing the above-mentioned A Breeding Method for Heat Stable Wheat Varieties

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