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首页> 美国卫生研究院文献>Plant Physiology >Diurnal Fluctuations in Cotton Leaf Carbon Export Carbohydrate Content and Sucrose Synthesizing Enzymes
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Diurnal Fluctuations in Cotton Leaf Carbon Export Carbohydrate Content and Sucrose Synthesizing Enzymes

机译：棉花叶片碳输出碳水化合物含量和蔗糖合成酶的日变化

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摘要

In fully expanded leaves of greenhouse-grown cotton (Gossypium hirsutum L., cv Coker 100) plants, carbon export, starch accumulation rate, and carbon exchange rate exhibited different behavior during the light period. Starch accumulation rates were relatively constant during the light period, whereas carbon export rate was greater in the afternoon than in the morning even though the carbon exchange rate peaked about noon. Sucrose levels increased throughout the light period and dropped sharply with the onset of darkness; hexose levels were relatively constant except for a slight peak in the early morning. Sucrose synthase, usually thought to be a degradative enzyme, was found in unusually high activities in cotton leaf. Both sucrose synthase and sucrose phosphate synthetase activities were found to fluctuate diurnally in cotton leaves but with different rhythms. Diurnal fluctuations in the rate of sucrose export were generally aligned with sucrose phosphate synthase activity during the light period but not with sucrose synthase activity; neither enzyme activity correlated with carbon export during the dark. Cotton leaf sucrose phosphate synthase activity was sufficient to account for the observed carbon export rates; there is no need to invoke sucrose synthase as a synthetic enzyme in mature cotton leaves. During the dark a significant correlation was found between starch degradation rate and leaf carbon export. These results indicate that carbon partitioning in cotton leaf is somewhat independent of the carbon exchange rate and that leaf carbon export rate may be linked to sucrose formation and content during the light period and to starch breakdown in the dark.
机译：在温室种植的棉花（Gossypium hirsutum L.，cv Coker 100）的完全膨胀的叶片中，碳输出，淀粉积累速率和碳交换速率在光照期间表现出不同的行为。在光亮时期，淀粉积累速率相对恒定，而即使碳交换速率在中午左右达到峰值，下午的碳出口速率也比早晨的高。在整个光亮时期，蔗糖水平增加，随着黑暗的来临，蔗糖水平急剧下降。己糖水平相对恒定，只是在清晨略有高峰。蔗糖合酶通常被认为是降解酶，在棉花叶片中发现异常活跃的活性。蔗糖合成酶和蔗糖磷酸合成酶的活性均在棉花叶片中昼夜波动，但节律不同。蔗糖输出速率的昼夜波动通常与光照期的蔗糖磷酸合酶活性一致，但与蔗糖合酶活性不相关。在黑暗中，酶的活性均与碳的出口无关。棉叶蔗糖磷酸合酶活性足以说明观察到的碳出口速率。不需要将蔗糖合酶作为成熟棉叶中的合成酶。在黑暗中，发现淀粉降解速率与叶片碳输出之间存在显着相关性。这些结果表明，棉叶中的碳分配在某种程度上与碳交换速率无关，并且叶的碳输出速率可能与光照期间的蔗糖形成和含量以及黑暗中的淀粉分解有关。

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