关键词: 高温胁迫, 生理指标, 产量构成, 河套灌区

Abstract:

 By setting different gradient temperature environments，this paper analyzed the physiological indexes of maize under different high temperature situation，and tracked the treated plants，analyzed the changes of the yield components，then determined the critical temperatures of the high temperature stress treatment of maize． The results are as follows:( 1) High temperature environment more than or equal to 32 ℃ had some effects on the physiological indexes and yield components of maize; ( 2) With the increasing of treatment temperature and prolonging of the period of high temperature treatment，the soluble sugar content，soluble protein content and SOD activity increased firstly and then decreased，and 100 － kernel weight and stalk weight showed a downward trend，but the ear barren tip showed a upward trend; ( 3) 38 ℃ was a turning point in many physiological indexes of maize tolerance to high temperature，which could be regarded as the important transition temperature．

Key words: Hetao irrigtion district, high temperature treatment, physiological indexes, yield components