The role of pigment system of an evergreen dwarf shrub Ephedra monosperma in adaptation to the climate of Central Yakutia
The role of pigment system of an evergreen dwarf shrub Ephedra monosperma in adaptation to the climate of Central Yakutia
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DOI：
10.1134/s1021443714010142
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发表时间：
2014-03-01
影响因子：
1.4
通讯作者：
Golovko, T. K.
中科院分区：
文献类型：
--
作者：
Sofronova, V. E.;Chepalov, V. A.;Golovko, T. K.
万年青矮灌木麻黄同化枝色素系统的适应性反应。Gmel.来自C.A. Mey.在雅库特中部的自然条件下进行了研究。揭示了绿色和黄色色素含量及比例的季节变化规律，以及它们与植物发育阶段和耐冷性形成的关系。叶绿素含量的下降始于9月，此时自然光周期变短，气温较低，冬季叶绿素浓度比夏季低30%。β-胡萝卜素的含量下降了两倍。叶黄素循环色素的含量和脱环氧化水平分别增加了1.7和3.6倍。在周边细胞的同化薄壁组织，积累的次生类胡萝卜素，红黄素。在植物生长活跃期（6月至8月），紫紫红质不存在，而其在冬季的芽中的浓度为75 μ g/g干重。它的结论是，在色素池的变化反映了光合机械的结构和功能重组，是植物硬化的复杂过程中不可或缺的一部分。能量耗散和抗氧化色素系统的激活，与积累的光屏蔽二级类胡萝卜素rhodoxanthin一起，促进光合机构的保留和雅库特cryolithozone极端条件下的单籽麻黄植物的生存。
Adaptive reactions of the pigment system in assimilating shoots of evergreen dwarf shrub Ephedra monosperma J.G. Gmel. ex C.A. Mey. were studied under natural conditions of Central Yakutia. Seasonal changes in the content and ratio of green and yellow pigments were revealed; their relation to the stage of plant development and formation of cold tolerance was shown. The decrease in chlorophyll content started in September when the natural photoperiod became shorter and the air temperature lower; the chlorophyll concentration in winter was 30% lower than in summer. The content of beta-carotene decreased twofold. The xanthophyll cycle pigments increased in content and deepoxidation level by a factor of 1.7 and 3.6, respectively. In peripheral cells of assimilating parenchyma, accumulation of a secondary carotenoid, rhodoxanthin was noted. In the period of active plant growth (from June to August), rhodoxanthin was absent, while its concentration in shoots in winter was 75 mu g/g dry wt. It is concluded that changes in the pigment pool reflect structural and functional reorganization of photosynthetic machinery and are an indispensable part of the intricate process of plant hardening. Activation of energy-dissipating and antioxidant pigment systems, together with accumulation of the light-screening secondary carotenoid rhodoxanthin, promote the retention of photosynthetic apparatus and the survival of Ephedra monosperma plants under extreme conditions of cryolithozone of Yakutia.