大血藤叶片生化成分的动态变化  

The Dynamic Changes of the Biochemical Components in the Leafblades of Sargentodoxa Cuneata

作　　者：金则新[1] 李钧敏[1] 钟章成[2] 葛明菊[1] 

机构地区：[1]台州师范专科学校,浙江临海317000 [2]西南师范大学,重庆北碚400715

出　　处：《武汉植物学研究》2002年第4期303-307,共5页Journal of Wuhan Botanical Research

基　　金：国家自然科学基金资助项目 (3 9870 160 )

摘　　要：对自然条件下大血藤叶片生化成分的动态变化进行了研究 ,结果表明 :大血藤叶片可溶性糖、淀粉和总糖含量的动态变化有相同的趋势 ,在叶片生长季节早期含量较低 ,随着叶片的生长发育 ,其含量逐渐上升 ,至 8月达到最大值后逐渐下降。叶片总糖含量与日均净光合速率的季节变化呈极显著的正相关。在整个生长季节中 ,可溶性糖含量比淀粉高。大血藤叶片总蛋白含量季节性变化呈单峰曲线 ,在展叶初期含量较低 ;随后迅速上升 ,在 6月初达到最大值后逐渐下降 ,落叶前降至最低点。可溶性蛋白质含量的季节性变化曲线与总蛋白含量基本相似。 DNA含量在叶生长初期大幅度上升 ,至 6月达到高峰后迅速下降 ,以后基本趋向稳定。RNA在叶生长初期有所上升 ,峰值也出现在 6月 ,以后缓慢下降 ,到 9月降至最低值 ,在落叶前又有所回升。总核酸含量的季节变化与 RNA变化相似。 RNA/ DNA比值在生长季节中出现 3次高峰。大血藤叶片总黄酮含量季节性变化呈“双峰”型 ,第 1高峰期在开花期的 5月 ,第 2高峰期在秋季的The dynamic features of biochemistry contents in the leafblades of Sargentodoxa cuneata under natural conditions were studied. The results showed as follows. The dynamic changes of the content of soluble sugar, starch and total sugar were similar. The content of them was low in the forepart of growth season, and ascended gradually with the growth of leafblades. The maximal content reached at August, then declined gradually. There were distinctly positive correlation between the content of total sugar and the average diurnal net photosynthetic rate. In the whole growth season, the content of soluble sugar was higher than that of starch. The seasonal change of total protein in the leafblades of Sargentodoxa cuneata showed as unimodal curve. The content of protein was low at the early stage of the spread of leafblades, and then it ascended quickly. The maximal content reached at June, then it declined gradually and the minimal content reached before defoliation. The seasonal change of soluble protein was similar to that of total protein. The content of DNA ascended at a large extent at the early stage of the growth of leafblades. The peak reached at June and declined rapidly, then it inclined to stabilization on the whole. The content of RNA ascended in a sort with peak at June, then it declined slowly while the minimal content reached at September and the content went back a little before defoliation. The seasonal content change of nucleic acid was similar to that of RNA. The ratio of RNA to DNA reached 3 pinnacles in the whole growth season. In a whole growth season, the dynamic patterns of flavonoids in the leafblades of Sargentodoxa cuneata were bimodal curve. The first peak was reached at May while the second peak was reached at September.

关 键 词：药用植物 大血藤 叶片 生化成分 动态变化 

分 类 号：R284[医药卫生—中药学] Q946[医药卫生—中医学]