2种大黄叶片色素及紫外吸收物质含量的比较研究

Comparative Study on the Leaves of Two Rhubarbs and the UV-absorbing Substances Contents

[目的]探讨唐古特大黄与药用大黄对高原强紫外线辐射的生理适应特征。[方法]以栽培于同一生境下的4年生唐古特大黄与药用大黄为研究对象,测定2种大黄叶片中的叶绿素、类胡萝卜素及紫外吸收物质的含量,研究了在高原强紫外线辐射下2种大黄的生理适应性。[结果]同一生境下唐古特大黄叶片中的叶绿素a、叶绿素b、叶绿素总量、类胡萝卜素和紫外吸收物质的含量高于药用大黄。[结论]叶绿素a、b及类胡萝卜素和紫外吸收物质的积累,有利于唐古特大黄对高原强紫外辐射的适应,是长期进化适应高原环境的结果。

[ Objective ] Physiological adaptation characters of Rh. tanguticum Maxim. ex Balf and Rh. Palmtum Linn to plateau intensive ultraviolet radiation were discussed. [ Method] Taking four-year old Rh. tanguticum Maxim. ex Balf and Rh. Palmtum Linn in the same habitat as the research materials, the contents of chlorophyll, carotenoid and UV-absorbing substances in rhubarb leaves were detected. Physiological adaptation characters of two rhubarbs under plateau intensive ultraviolet radiation were studied. [ Result ] Under the same habitat, the contents of chlorophyll a, chlorophyll b, total content of chlorophyll, caroteniod and UV-absorbing substances in the leaves of Rh. Tanguticum Maxim. ex Balf. were higher than those of Rh. Palmtum Linn. [ Conclusion ] The accumulation of chlorophyll, carotenoid and UV-absorbing substances could help the Rh. Tangtaicum Maxim. ex Balf. to adapt to plateau intensive ultraviolet radiation.