棉花花青素能量耗散过程维持光合机构稳定性分析

【目的】研究棉花花青素能量耗散过程维持光合机构稳定性。【方法】选取花青素含量差异较大的棉花为材料,测定花青素含量、光合色素含量、气体交换参数、叶绿素荧光参数、NDH介导的环式电子流活性、ATP合成酶活性、玉米黄质的合成速率等。【结果】随花青素含量升高,吸光能力逐渐增强,而净光合速率逐渐减弱,将面临较多的过剩激发能;NDH介导的环式电子流活性均逐渐增强,并且环式电子调控的ATP合成也逐渐增强;相对于无花青素的棉花,花青素存在的条件下,叶黄素循环的热耗散明显较弱,并且随花青素含量的增多,叶黄素循环的过程逐渐减弱,可能花青素的耗散能力逐渐增强。【结论】花青素能够作为一种光保护机制起到耗散过剩光能有效保护PSI和PSII。

Cotton Can Protect Photosynthetic Mechanism through Energy Dissipation Processes That Rely on Anthocyanins

【Objective】 Cotton Can Protect Photosynthetic Mechanism through Energy Dissipation Processes That Rely on Anthocyanins. 【Methods】 In this study, cotton with big difference in anthocyanin content was selected as the experimental material, the anthocyanin content, photosynthetic pigment content, gas exchange parameters, chlorophyll fluorescence parameters, total cyclic electron flow activity, NDH-mediated cyclic electron flow activity, ATP synthase activity, zeaxanthin synthesis rate were measured. 【Results】 With the increase of anthocyanin content, the light absorption capacity was gradually enhanced, while the net photosynthetic rate was gradually weakened, so there were more excess excitation energy. At this time, the total cyclic electron flow and NDH mediated cyclic electron flow were gradually enhanced, and the cyclic electron regulated ATP synthesis was also gradually enhanced. Compared with the anthocyanin-free cotton, the heat dissipation of the lutein cycle was obviously weak under the presence of anthocyanin, and the process of the lutein cycle was gradually weakened with the increase of anthocyanin content, and the dissipation capacity of anthocyanin might be gradually enhanced. 【Conclusion】 Therefore, anthocyanins can effectively protect PSI and PSII by dissipating excess light as a photoprotection mechanism.