UV-irradiation and shade change the concentration of catalpol in Rehmannia glutinosa seedling and rhizosphere
首发时间:2013-07-02
Abstract:Research was conducted on Rehmannia glutinosa Libosch., a Chinese traditional medicinal plant, to investigate the effects of UV-irradiation and shade on the concentration of catalpol in seedlings and rhizosphere. The plants were grown under three irradiances: full light, partial shade (50% full light), and UV-irradiation. The R. glutinosa seedlings were harvested and the hydroponic culture solution in the containers was collected on day 3, 6, 9, 12, 15 after treatment respectively for determination of catalpol. The results showed that UV-irradiation increased the concentration of catalpol in leaves rapidly at the early stage, and then, instead of increasing, the concentration of catalpol decreased a little. In contrast, the catalpol content in R. glutinosa leaves was reduced under partial shade. Similar trends were observed in roots and stems of R. glutinosa under UV-irradiation and shade. The concentration of catapol in medium in which full-light, shade and UV-irradiated seedlings were grown all increased with time. But the concentration of catapol in medium of UV-irradiated seedlings was greater than that of full-light seedlings, and the concentration of catapol in medium of shade seedlings is lower. Therefore, UV-irradiation increased both production of catalpol in R. glutinosa seedlings, and secretion of catalpol into R. glutinosa rhizosphere. On the contrary shading decreased not only production of catalpol in R. glutinosa seedlings, but also secretion of catalpol into R. glutinosa rhizosphere. It was also found that UV-irradiation decreased the root vigor and partial shading increased the root vigor of R. glutinosa seedlings.
keywords: Rehmannia glutinosa Catalpol Rhizosphere Shade UV-irradiation Root vigor
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UV-B辐射和遮阴对地黄幼苗和根际梓醇含量的影响
摘要:本研究以地黄(Rehmannia glutinosa Libosch.)为材料研究UV-B辐射和遮阴对地黄幼苗和根际梓醇含量的影响。利用水培方法,将地黄分别培养于全日照、半遮阴(50%日照)、UV-B辐射三种不同的辐射下。分别在3、6、9、12、15天后测定地黄幼苗和培养液中的梓醇含量。结果表明UV-B辐射下叶片迅速积累梓醇;在半遮阴情况下,地黄叶片中的梓醇含量减少;根和茎中梓醇含量的变化规律与叶相似。培养液中梓醇含量随着幼苗的生长逐渐增加,其中UV-B辐射下培养液中梓醇含量高于全日照处理,半遮阴处理下的梓醇含量最低。实验证明,UV-B辐射不仅增加地黄幼苗中梓醇的含量,而且增加梓醇向根运输并分泌到根际;半遮阴不仅减少梓醇在地黄幼苗中的积累,也减少了梓醇向根部运输和分泌。同时也发现UV-B辐射减弱了根部活力,而半遮阴则增强根活。根际梓醇含量增加导致根部活力减弱也许是地黄连作障碍的原因之一。
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