OSMOREGULATION IN COTTON FIBER - ACCUMULATION OF POTASSIUM AND MALATE DURING GROWTH
OSMOREGULATION IN COTTON FIBER - ACCUMULATION OF POTASSIUM AND MALATE DURING GROWTH
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DOI：
10.1104/pp.56.3.394
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发表时间：
1975-01-01
期刊：
影响因子：
7.4
通讯作者：
TING, IP
中科院分区：
文献类型：
--
作者：
DHINDSA, RS;BEASLEY, CA;TING, IP
棉花（Gossypium hirsutum L.）已经研究了纤维生长（主要是延伸）。生长取决于纤维中的膨压。当由于添加Carbowax 6000而导致培养基的水势降低等于纤维的膨压时，其被抑制。钾和苹果酸在纤维中积累，并在生长速度最快时达到峰值水平。纤维中达到的钾和苹果酸盐的最大浓度可以占纤维渗透势的50%以上。随着生长速度减慢，钾和苹果酸的水平降低，膨压下降。棉花胚珠能够在黑暗中固定H14 CO 3 −，主要是苹果酸。纤维生长受到钾和/或大气CO2缺乏的抑制。我们认为，钾和苹果酸盐的行为，作为调节溶质和苹果酸盐，至少部分，从黑暗CO2固定反应。
Kinetics and osmoregulation of cotton (Gossypium hirsutumL.) 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 H14CO3−in the dark, predominantly into malate. Fiber growth is inhibited by the absence of potassium and/or atmospheric CO2. We suggest that potassium and malate act as osmoregulatory solutes and that malate, at least in part, arises from dark CO2fixation reactions.