玉米不同基因型气孔阻力的变化及其与光合、蒸腾作用的关系

Changes of Stomatal Resistance (RS) and the Relationships between Photosynthesis (PH),Transpiration (TR) and RS among Different Inbreds Lines of Maize

在田间条件下，研究了生产上广泛应用的１７个玉米自交系的气孔阻力（ＲＳ）及其与光合速率（ＰＨ）、蒸腾速率（ＴＲ）的关系。主要结果是：（１）不同自交系之间ＲＳ具有显著的差异，相差最大可达２．３倍以上；（２）ＲＳ随生育进程的推延而增大；（３）ＲＳ同ＰＨ、ＴＲ及ＷＵＥ（叶片水分利用率）在玉米生长的主要阶段存在极显著的指数函数关系，而在某一特定的生育期则表现出极显著的直线关系；（４）ＲＳ与ＰＨ、ＴＲ、ＷＵＥ及Ｒ（呼吸速率）的相关度从大到小依次是ＴＲ＞ＰＨ＞ＷＵＥ＞Ｒ；（５）气孔阻力值拟可作为不同基因型的重要生理学特征之一。

Seventeen inbred lines of maize which have been applied widely in practice were used to study RS and the relationships between PH,TR and RS in field conditions. The results showed:(1) the values of RS was significantly different among inbred lines;(2) the relationships between PH,TR,WUE and RS could be simulated as y=aebxduring main growth stages and as y=a+bx in a special stage; (3) the correlative degree:rRS-TR>rRS-PH>rRS-WUE>rRS-R;(4) stomatal resistance might be regarded as a important characteristic of maize genotypes.