在温室条件下研究了芹菜叶片光合性能对增强UV-B辐射的适应性响应。结果表明：芹菜叶片光合色素含量随辐射效应累积而降低，叶绿素a/b值随辐射强度增加而升高。芹菜叶片Pn、Gs、Tr、WUE值均随辐射时间延长和强度增加而降低。Pn与Gs极显著正相关，与Ci不相关，增强UV-B辐射对芹菜光合作用的影响由非气孔限制因素引起。芹菜可以适应长期的轻度(0.2W/m2)UV-B辐射，但重度辐射(0.8W/m2)严重降低了芹菜叶片的净光合速率，使“光合午休”时间延长达3h。
第1个回答 2009-12-14
Studied under greenhouse conditions, celery leaf photosynthetic performance of enhanced UV-B radiation adaptive response. The results showed that: celery leaf photosynthetic pigment content decreases with the accumulation of radiation effects, chlorophyll a / b value increased with the increase in radiation intensity. Celery leaf Pn, Gs, Tr, WUE values are extended with the irradiation time and intensity increases. Pn and Gs was significantly positive correlation with the Ci are not related to enhanced UV-B radiation on photosynthesis of celery by non-stomatal limitation factors. Celery can adapt to long-term mild (0.2W/m2) UV-B radiation, but severe radiation (0.8W/m2) severely reduced the net photosynthetic rate of celery leaves so that the "midday depression" time extension of up to 3h.
