不同海拔对珙桐叶片生理指标的影响

Effects of Altitudes on Physiological Indicators of Davidia Involucrata Leaves

为探讨珙桐(Davidia involucrate Baill.)对海拔的生理适应机制,研究珙桐叶片中色素、花色素苷、丙二醛(MDA)、游离脯氨酸(Pro)、超氧化物歧化酶(SOD)、紫外吸收物质的含量与海拔的关系是十分重要的。结果表明:珙桐叶片中叶绿素a、b、类胡萝卜素、MDA的含量随海拔高度的增加,呈减少的趋势,叶绿素a/b值在海拔1 650 m时最大,MDA含量在海拔1 590 m时最高;花色素苷、紫外吸收物质、Pro的含量随着海拔高度的增加,呈先增高后降低的趋势。花色素苷和Pro含量在海拔1 650 m时最大,紫外吸收物质含量在海拔1 590 m时最高;珙桐叶片中超氧化物歧化酶(SOD)的活性随海拔高度的递增而逐渐增加。综合本次研究表明,珙桐在一定海拔范围内,受到高海拔不利环境的胁迫时,可通过自身内部的调节保护自己。

To explore the physiological adaptation mechanisms of Davidia involucrate to altitudes, studies were made of the relationship between pigment, anthocyanin, malondialdehyde, proline, superoxide dis-mutase,and UV-absorbing compounds contents of Davidia involucrata leaf blades and altitudes. The re-search results showed that chlorophyll a and b, carotenoids, MDA content would decrease with the increase of an altitude, the maximum value of chlorophyll a/b ratio occurred at an altitude of 1 650 m, while the maximum contents of MDA occurred at an altitude of 1 590 m;anthocyanins, UV-absorbing compounds and Pro contents would reduce after first increasing with increasing altitude. The maximum contents of an- thocyanins and Pro occurred at an altitude of 1 650 m,while the maximum content of UV-absorbing com-pounds occurred at an altitude of 1 590 m;leaf superoxide dismutase （SOD） activity would gradually in-crease with altitude increasing. In general, when Davidia involucrate got stress from adverse environment at high altitudes, it could protect itself by internal regulation in a certain altitude range.