光质对珙桐幼苗形态建成及光合特性的影响

Effect of light quality on morphogenesis and photosynthetic characteristics of Davidia involucrata seedlings

摘要:

为探究不同光质对珙桐幼苗的形态和生理指标的影响，采用发光二极管（LED）对珙桐幼苗进行不同颜色的可见光处理（白色，蓝色，绿色和红色）.结果表明，红光处理下的珙桐幼苗株高最低但光合色素含量最高；绿光使幼苗叶宽及叶面积明显减小，光合色素含量显著增加；蓝光处理则使幼苗生长较高，叶绿素荧光特性参数及H2O2等含量也最高，但光合色素含量和PSⅡ量子产量最低；白光使珙桐幼苗生长最高，但光合色素和H2O2及MDA等含量较低.以上结果说明珙桐幼苗在不同的生长环境下能形成不同的生长机制，通过感知光质来调整自身的生理机能，最大限度地进行适应性生长.

Abstract:

To explore the effects of different light qualities on the morphological and physiological indicators of the Davidia involucrata seedlings, LightEmitting Diode (LED) was used to treat the seedlings under different visible light (white, blue, green, and red). The results showed that the Davidia involucrata seedlings had the lowest height but the highest photosynthetic pigments content under red light treatment; green light significantly reduced leaf width and leaf area of seedlings but significantly increased photosynthetic pigments content; blue light treatment resulted in higher height of seedlings, the highest chlorophyll fluorescence parameters and H2O2 content, but the lowest photosynthetic pigments content and PSⅡ quantum yield; the highest height, lower content of photosynthetic pigment, H2O2 and MDA were found in seedlings irradiated with white light. These results indicated that Davidia involucrata seedlings could form different growth mechanism under different light environment, and adjust their physiological status according to the sensing light quality, and maximize adaptive growth.