茉莉酸甲酯对水稻幼苗光合作用的影响

EFFECT OF JASMONIC ACID METHYL ESTER ON THE PHOTOSYNTHESIS OF RICE SEEDLINGS

２．５×１０－４ｍｏｌ／Ｌ茉莉酸甲酯处理水稻（ＯｒｙｚａｓａｔｉｖａＬ．）幼苗叶片，可明显地降低Ｃｈｌａ、Ｃｈｌｂ的含量及叶片的光合速率，抑制ＲｕＢＰＣａｓｅ的活性，抑制幼苗叶片中ＲｕｂｉｓＣＯ大亚基的合成，降低小亚基的含量。对幼苗叶片中叶绿素含量、叶片的光合速率及ＲｕＢＰＣａｓｅ的活性没有影响。

The contents of chlorophyll a and chlorophyll b, as well as the photosynthetic rate and the activity of RuBP carboxylase in leaves of rice (Oryza sativa L.) seedlings were apparently decreased by treating with 2.5×10-4 mol/L jasmonic acid methyl ester (JaMe). The synthesis and contents of RubisCO and its large and small subunit were distinctly reduced by this treatment either. Only did 2.5×10-7 mol/L JaMe treatment suppress the synthesis of large RubisCO subunit and decrease the content of small RubisCO subunit, it had no effects on the chlorophyll content, photosynthetic rate and RuBP carboxylase activity in leaves of rice seedlings.