Method for screening cold-resistant cotton varieties and application thereof

Abstract

The invention discloses a method for screening cold-resistant cotton varieties and application thereof. The method comprises the following steps of (1) seeding cotton seeds of different varieties; after the seeding for two days, realizing young seedling emergence; removing young seedlings with nonuniform growth conditions in the fourth day; maintaining the continuous growth of other young seedlings; (2) realizing flat spreading of cotyledons after the young seedlings grow to the seventh day; performing cold adaptation on the young seedlings; then, performing cold treatment; next, performing hot adaptation and restoration treatment; counting the survival rate and counting the cotyledon cold damage level; next, calculating the form index; testing the relative electrical conductivity of detached leaves when the cold treatment is performed for 72 hours; and evaluating the cold resistance according to the form index or the relative electrical conductivity.

Description

technical field [0001] The invention belongs to the technical field of screening cotton varieties, and in particular relates to a method for screening cold-resistant cotton varieties and an application thereof. Background technique [0002] Cotton is a worldwide important fiber crop and plays an important role in the national economy. With the "westward, eastward, and northward" of the main cotton producing areas, Xinjiang has become the main cotton planting area in my country, and the cotton production in Xinjiang accounts for more than 80% of my country's output. Due to the specific ecological and climatic conditions in Xinjiang, cotton fields are subjected to varying degrees of "cold spring" low temperature damage every year, which seriously affects the growth and production of cotton. Therefore, the selection of cold-tolerant cotton varieties in production is of great significance for resisting the low temperature damage in Xinjiang and realizing high-quality and high-y...

AI Technical Summary

Problems solved by technology

The method of this invention directly restores growth at normal temperature from low temperature treatment, which is easy to cause freezing damage to cotton seedlings, reduces the survival rate and thus brings great errors, and the identification standards are cumbersome and the indicators are fuzzy, so it is not suitable for large quantities of cotton Screening of populations or varieties, and the treatment time is short, and it does not reach the most significant difference in cold resistance among cotton varieties

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