Changes in the Biochemical Composition, Structure, and Function of Pea Leaf Chloroplasts in Iron Deficiency and Root Anoxia
Changes in the Biochemical Composition, Structure, and Function of Pea Leaf Chloroplasts in Iron Deficiency and Root Anoxia
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缺铁和根部缺氧时豌豆叶绿体生化组成、结构和功能的变化
DOI：
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发表时间：
2004
影响因子：
0.8
通讯作者：
V. Ladygin
中科院分区：
文献类型：
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作者：
V. Ladygin
研究了缺铁和根缺氧对豌豆叶片叶绿体生化组成、功能和结构的影响。结果发现，缺铁引起的顶叶失绿是由捕光复合物I和II的减少决定的。在根系缺氧条件下，光系统I和II反应中心的复合物首先降解。在这两种因素的作用下，即使在黄色和白色叶中也保持了微弱的活性。叶片叶绿体超微结构逐渐退化。最初，基粒间类囊体网站减少，基粒的纵向方向被打乱。而黄色和白色叶片仍保留有小的类囊体和基粒。因此，缺铁和根缺氧对叶片叶绿体复合体组成和结构与功能的影响是相加的，这是由于它们各自的自主机制所致。
A combined effect of iron deficiency and root anoxia on the biochemical composition, function, and structure of pea leaf chloroplasts was studied. It was found that the chlorosis of apical leaves in response to iron deficiency was determined by the reduction of light-harvesting complexes I and II. Under root anoxia, complexes of the reaction centers of photosystems I and II degraded first. Weak activity was preserved even in yellow and white leaves under the effect of both factors. The ultrastructure of leaf chloroplasts gradually degraded. Initially, intergranal thylakoid sites were reduced, and the longitudinal orientation of grana was disturbed. However, yellow and white leaves still retained small thylakoids and grana. It is concluded that the degrading effects of iron deficiency and root anoxia on the complex composition and leaf chloroplast structure and function are additive because of their autonomous mechanisms.