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首页> 外文期刊>European Journal of Medicinal Chemistry: Chimie Therapeutique >Photosynthetic pigment composition and photosystem II photochemistry of wheat ears
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Photosynthetic pigment composition and photosystem II photochemistry of wheat ears

机译：小麦穗的光合色素组成和光系统II光化学

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摘要

The characteristics of pigment composition and photosystem II (PSII) photochemistry in the flag leaf and ear parts of wheat (Triticum aestivum L.) grown in the field was compared. At the early stage of flowering, awns and the flag leaf showed the highest values in the maximal efficiency of PSII photochemistry (F_v/F_m), actual PSII efficiency (Φ_(PSII)), photochemical quenching (qP), and the efficiency of excitation capture by open PSII centres (F′_v/F′_m), followed by glumes, lemmas, and paleae, respectively except that no differences in F′_v/F′_m were observed among glumes, leamms, and paleae. With progressing grain filling, there was a change in the photosynthetic pigment stoichiometry. In the ear parts, neoxanthin and antheraxanthin decreased equally with chlorophyll levels. Lutein and zeaxanthin decreased less than chlorophyll levels while β-carotene and violaxanthin decreased faster than chlorophyll levels. No big differences in pigment composition were observed among different ear parts. For the flag leaf, neoxanthin and β-carotene decreased concomitantly with chlorophyll, whereas lutein and xanthophyll cycle pigment were less affected, leading to increases in lutein/chlorophyll and xanthophyll cycle pigment/chlorophyll ratios. F_v/F_m, Φ_(PSII), qP, and F′_v/F′_m decreased gradually in the flag leaf and ear parts but to different extents. The largest changes were observed in awns, followed by the lemmas of floret 2, the lemmas of floret 1, glumes, and the flag leaf, respectively. The results suggest that during grain filling, a down-regulation of PSII associated with an increase of the de-epoxidation state of the xanthophyll cycle carotenoids occurred in the flag leaf but not in the ear parts.
机译：比较了田间生长的小麦（Triticum aestivum L.）的旗叶和穗部的色素组成和光系统II（PSII）光化学特征。在开花初期，芒和旗叶在PSII光化学的最大效率（F_v / F_m），实际PSII效率（Φ_（PSII）），光化学猝灭（qP）和激发效率中表现出最高的值。通过开放的PSII中心（F'_v / F'_m）捕获，然后分别捕获颖，引理和古部，只是在颖，叶和古部之间未观察到F'_v / F'_m的差异。随着谷物填充的进行，光合色素化学计量发生了变化。在耳部，新黄嘌呤和花药黄素与叶绿素水平同样下降。叶黄素和玉米黄质的下降速度小于叶绿素水平，而β-胡萝卜素和紫黄质的下降速度快于叶绿素水平。在不同的耳朵部分之间没有观察到色素成分的大差异。对于旗叶，新黄嘌呤和β-胡萝卜素与叶绿素同时减少，而叶黄素和叶黄素循环色素的影响较小，导致叶黄素/叶绿素和叶黄素循环色素/叶绿素比例增加。 F_v / F_m，Φ_（PSII），qP和F'_v / F'_m在剑叶和耳部逐渐降低，但程度不同。在芒中观察到最大的变化，其次是小花2的引理，小花1的颖片，颖片和旗叶。结果表明，在灌浆过程中，与叶黄素循环类胡萝卜素的脱环氧化状态增加相关的PSII的下调发生在旗叶中，而不是在耳部。

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