温度对三种满江红光合及固氮活性的影响

本文报道满江红(Azolla imbricata)、卡洲满江红(A. caroliniana)和蕨状满江红(A. filiculoides)的光合与固氮(乙炔还原)活性对温度的反应差异。根区培养液温度在7—40℃范围内满江红与卡洲满江红的光合活性在30℃达到峰值，高于或低于30℃均急剧下降。而蕨状满江红在7—25℃的根区温度范围内光合活性差异不大，高于25℃则下降(图2)。0℃24小时或40℃2小时暗预处理对三种满江红光合活性与乙炔还原活性表现出不同影响(图3，4)。本文报道的方法可用于满江红生理生态参量的比较研究。

Influences of Temperature on the Photosynthetic and Acetylene Reduction Activity of Three Azolla Species

Photosynthetic activities of Azolla imbricata, A. caroliniana and A. filiculoides were studies under different root-zone temperatures. A. imbricata and A. caroliniana present maxium photosynthetic activity at 30℃. photosynthetic activity were decreased dramatically when temperatures (with 7-40℃) were lower or higher than 30~C.Whereas A.filiculoides showed similar photosynthetic activity in the range of root-zone temperatures 7-25℃ (Fig.2). The photosynthetic and acetylene reduction activities of the three Azolla species were influenced in different pattern by the pretreatment of 24 hours dark 0℃ or 2 hours dark 40℃ (Fig. 3,4). The methods here reported were suggested using to measure the ecological-physiology parameters Of Azolla germplasms.