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测定了祁连山大火烧(相对干旱环境)和吐鲁沟(相对湿润环境)中祁连圆柏(Sabina przewal-skii)幼树和老树叶片5种色素含量以及稳定碳同位素组成和脯氨酸含量等指标.结果显示:在相对干旱的环境下,幼树和老树的叶黄素循环转换率(Z+A)/(V+A+Z)、类胡萝卜素含量、脯氨酸含量及稳定碳同位素值都较高,而PsⅡ光化学效率(Fv/Fm)及叶绿素含量都较低,且花青素和紫松果黄素含量也较低;在两种不同生境下,除Fv/Fm及叶绿素外,老树的其它指标都显著高于幼树.结果说明色素在干旱胁迫下起重要的光保护作用,其变化是祁连圆柏在长期与环境交互作用过程中形成的一种适应策略.
Five kinds of pigment content, stable carbon isotope composition and proline content of Sabina przewalskii sapling and old tree leaves in the fires of Qilian Mountains (relatively arid environment) and Turluou (relatively humid environment) were measured The results showed that under relatively drought conditions, the ratio of lutein cycle conversion (Z + A) / (V + A + Z), carotenoid content, proline content and stable carbon isotope The values of Fs / Fm and chlorophyll were lower, and the contents of anthocyanin and rhodoxanthin were also lower. Under the two different habitats, except Fv / Fm and chlorophyll , And the other indexes of old trees were significantly higher than that of saplings.The results showed that pigments played an important photoprotective role under drought stress and their changes were the adaptation strategies of Sabina przewalskii in long-term interaction with the environment.