Dhindsa R S, Beasley C A, Ting I P
Department of Biology, University of California, Riverside, California 92502.
Plant Physiol. 1975 Sep;56(3):394-8. doi: 10.1104/pp.56.3.394.
Kinetics and osmoregulation of cotton (Gossypium hirsutum L.) fiber growth (primarily extension) have been studied. Growth is dependent on turgor pressure in the fiber. It is inhibited when a decrease in the water potential of the culture medium due to an addition of Carbowax 6000, equals the turgor pressure of the fiber. Potassium and malate accumulate in the fiber and reach peak levels when the growth rate is highest. Maximum concentrations of potassium and malate reached in the fiber can account for over 50% of the osmotic potential of the fiber. As growth slows down, levels of potassium and malate decrease and turgor pressure declines. Cotton ovules are capable of fixing H(14)CO(3) (-) in the dark, predominantly into malate. Fiber growth is inhibited by the absence of potassium and/or atmospheric CO(2). We suggest that potassium and malate act as osmoregulatory solutes and that malate, at least in part, arises from dark CO(2) fixation reactions.
对棉花（陆地棉）纤维生长（主要是伸长）的动力学和渗透调节进行了研究。纤维的生长依赖于其膨压。当由于添加聚乙二醇6000导致培养基水势降低至与纤维膨压相等时，生长受到抑制。钾和苹果酸在纤维中积累，并在生长速率最高时达到峰值水平。纤维中钾和苹果酸的最大浓度可占纤维渗透势的50%以上。随着生长减缓，钾和苹果酸水平下降，膨压也随之降低。棉花胚珠能够在黑暗中固定H(14)CO(3) (-)，主要生成苹果酸。钾和/或大气中的二氧化碳缺失会抑制纤维生长。我们认为钾和苹果酸作为渗透调节溶质起作用，并且苹果酸至少部分源自黑暗中的二氧化碳固定反应。
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