Method for performing field screening on maize inbred line with strong high-temperature resistance

Abstract

The invention provides a method for performing field screening on a maize inbred line with strong high-temperature resistance. The method comprises the following steps: I, selecting a plurality of inbred lines, and taking an inbred Zheng 58 as a control group; II, seeding each of the selected inbred lines in a test site according to a seeding time I and a seeding time II, wherein the seeding time I is a high-temperature-avoiding period of a maize anthesis maturity period, and the seeding time II is a period when the maize anthesis maturity period is positioned at a high temperature; III, calculating a comprehensive high-temperature resistance coefficient of each inbred line; and IV, determining the high-temperature resistance of the inbred lines. According to the technical scheme of the invention, the method disclosed by the invention has the beneficial effects that (1) the screening process is simplified and is convenient to operate; (2) two traits such as seed setting and single ear yield of the maize are tested and expressed in a digital manner, the evaluation standard is intuitive, and the result is reliable; and (3) the comprehensive high-temperature resistance coefficient of each maize inbred line can be rapidly calculated by using a calculating expression of the comprehensive high-temperature resistance coefficient, and rapid and high-efficiency screening and identifying effects are achieved.

Description

technical field [0001] The invention relates to the technical field of agricultural planting, in particular to a method for screening strong high-temperature-resistant corn inbred lines in a field. Background technique [0002] In recent years, as the "greenhouse effect" has been intensified, short-term abnormal high temperatures have become more frequent, and the impact of high temperature stress on maize has become increasingly prominent. In my country's southwestern corn region and the Huanghuaihai summer corn region, the frequent occurrence of long-term high temperature and dry weather during the flowering and grain stage has a huge impact on the corn yield in the region. For example, the extreme high temperature weather from the end of June to the beginning of August in 2013 caused huge losses to corn production in Southwest and South China. [0003] Maize suffers from high temperature stress during the tasseling and silking stage, which may cause the growth and develo...

AI Technical Summary

Problems solved by technology

The disadvantage is that there is no control, and the high temperature resistance characteristics of corn inbred lines are artificially divided into four levels according to the HTT value (that is, the HTT value between 70 and 100 is the special type, and the HTT value between 51 and 70 is the high temperature resistance type. type, between 31 and 50 is the moderate resistance type, and between 0 and 30 is the non-resistant type), the evaluation of high temperature resistance is more subjective

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