The chlorophyll and carotenoid content, and the spectra of low-temperature fluorescence of the leaves, chloroplasts and isolated pigment-protein complexes in the perennial herbaceous wintergreen plant Ajuga reptans L. (bugle) in different seasons of the year were studied. During winter, these plants downregulate photosynthesis and the PSA is reorganised, including the loss of chlorophyll, possible reductions in the number of functional reaction centres of PSII, and changes in aggregation of the thylakoid protein complexes. We also observed a restructuring of the PSI-PSII megacomplex and the PSII-light-harvesting complex II supercomplex in leaves covered by snow. After snowmelt, the monomeric form of the chl a/b pigment-protein complex associated with PSII (LHCII) and the free pigments were also detected. We expect that snow cover provides favourable conditions for keeping photosynthetic machinery ready for photosynthesis in spring just after snowmelt. During winter, the role of the zeaxanthin-dependent protective mechanism, which is responsible for the dissipation of excess absorbed light energy, is likely to increase.

译文

多年生草本冬绿植物Ajuga reptans L中的叶绿素和类胡萝卜素含量,以及叶片,叶绿体和分离的色素-蛋白质复合物的低温荧光光谱。(军号) 在一年中的不同季节进行了研究。在冬季,这些植物下调了光合作用,PSA被重组,包括叶绿素的损失,PSII功能反应中心数量的可能减少以及类囊体蛋白复合物聚集的变化。我们还观察到被雪覆盖的叶子中PSI-PSII巨复合体和PSII-采光复合体II超复合体的重组。融雪后,还检测到与PSII (LHCII) 相关的chl a/b色素-蛋白复合物的单体形式和游离色素。我们希望积雪为在融雪后的春季保持光合作用机械的准备提供有利条件。在冬季,玉米黄质依赖的保护机制的作用可能会增加,该机制负责消耗过多的吸收光能。

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