J Integr Plant Biol. ›› 2000, Vol. 42 ›› Issue (5): 467-470.

• Research Articles • Previous Articles     Next Articles

Effects of Water Stress on the Mossbauer Spectrum of Fe2+/Fe3+ Components in Cucumber PSII Particles

ZENG Fu-Li, WU Jin-Song, ZHANG Li-Jing, WANG Jian-Bo, ZHOU Rong-Jie, ZHANG Ming-Feng   

Abstract:

There were four doublets in the Mössbauer spectrum of cucumber ( Cucumis sativus L.) photosystemⅡ (PSⅡ) particles. According to the value of isomer shift and quadrupole splitting, they represented oxidized cytochrome b559 (Cyt-b559), reduced Cyt-b559, Fe3+-quinone (Q) complex, and Fe2+-Q complex respectively. After water-stress, the electron transport rate between QA (primary quinone electron acceptor of PSⅡ)/QB(secondary quinone electron acceptor of PSⅡ) was affected and the absorption doublets of Fe2+ disappeared, suggesting that the reduced Cyt-b559 and Fe2+-Q complex had been oxidized. The results indicated that water-stress had changed the redox status of iron in the iron-quinone complex. Iron took part in electron transport through the change from a state of reduction to oxidation.

干旱胁迫对黄瓜PSII颗粒铁组分Mossbauer谱的影响
曾福礼1 吴劲松1 张丽静1 王建波2 周荣洁2 张明凤3*

(兰州大学,生物系1,物理系2,化学系3,兰州730000)

摘要:黄瓜(Gcumis sativus L)叶片PSⅡ颗粒的Mossbauer谱呈现4套双峰,依它们的化学位移相四敬矩劈塑数值,分别属于氧化态Cyt-b559,还原态Cyl-b559、Fe3+-Q画物和Fe2+-Q复合物。干埋胁迫旱影响QA/QB中铁(Fe)参与电子传递的速率,使PSⅡ颗粒的Mossbauet谱中Fe2+的吸收双峰消失,即还原态G7yt-B559转变为氧化态Cyt-b559Fe2-Q复合物转变为Fe3+-Q复合物。结果干旱胁迫改变了铁醌复合物中的铁存在状态,使铁具有氧化6还原态变化,从而参与电子传递。

关键词: 黄瓜;PSII颗粒;Mossbauer谱;Fe-Q复合物;干旱胁迫

Key words: cucumber, PSⅡ particles, Mö, ssbauer spectrum, Fe-quinone complex, water stress

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