芸薹属中几个物种碳酸酐酶活性的比较

检测芸薹属中几种植物的碳酸酐酶在根、茎、叶中的分布和活性以及叶片净光合速率和锌元素含量的结果表明：碳酸酐酶在甘蓝型油菜的根、茎、叶中均有分布,叶中的碳酸酐酶活性最大,茎中的次之,根中的最小。不同芸薹属植物中碳酸酐酶活性的大小依序为：甘蓝型油菜〉白菜型油菜〉芜菁〉埃塞俄比亚芥。以甘蓝型油菜为例,碳酸酐酶活性的日变化呈双峰曲线,在整个生育期的变化趋势是先上升后下降,抽薹期间的碳酸酐酶活性最高。碳酸酐酶活性与净光合速率以及与锌元素含量之间均呈现显著的正相关。

Comparison of Carbonic Anhydrase Activities of Several Species in Brassica

The distribution and activities of carbonic anhydrases （CA） in root, stem, and leaf of several species in Brassica were studied in order to determine the correlations between CA activity with net photosynthetic rate or zinc content. It was showed that CAs were distributed extensively in root, stem, and leaf of Brassica. CA activity was much higher in leaves than that in roots or stems, while enzyme activity in roots was the lowest. Considering different species in Brassica, CA activities in leaves were descending with the range as B. napus L., B. campestris L., B. rapa L., and B. carinata L. The diurnal variation of CA activity in B. napus leaves showed the double-peak curve during whole growth period, which reached its maximum at the bolting stage. It could be concluded that CA activity had positive correlation with net photosynthetic rate and zinc content, respectively.