成熟鳄梨果实更年期呼吸的调控
Regulation of climacteric respiration in ripening avocado fruit.
作者信息
Bennett A B, Smith G M, Nichols B G
机构信息
Department of Vegetable Crops, Mann Laboratory, University of California, Davis, California 95616.
出版信息
Plant Physiol. 1987 Apr;83(4):973-6. doi: 10.1104/pp.83.4.973.
Abstract
Ripening of avocado fruit is associated with a dramatic increase in respiration. In vivo(31)P nuclear magnetic resonance spectroscopy revealed large increases in ATP levels accompanying the increase in respiration. Both glycolytic enzymes, phosphofructokinase, and pyrophosphate: fructose-6-phosphate phosphotransferase were present in avocado fruit with the latter activity being highly stimulated by fructose 2,6-bisphosphate. Fructose 2,6-bisphosphate levels increased approximately 90% at the onset of ripening, suggesting that the respiratory increase in ripening avocado fruit may be regulated by the activation of pyrophosphate:fructose-6-phosphate phosphotransferase by an increase in fructose 2,6-bisphosphate.
摘要
鳄梨果实的成熟与呼吸作用的显著增强有关。体内³¹P核磁共振波谱显示，随着呼吸作用的增强，ATP水平大幅升高。鳄梨果实中同时存在糖酵解酶磷酸果糖激酶和焦磷酸：果糖-6-磷酸磷酸转移酶，后者的活性受到果糖2,6-二磷酸的高度刺激。在成熟开始时，果糖2,6-二磷酸水平大约增加了90%，这表明成熟鳄梨果实呼吸作用的增强可能是通过果糖2,6-二磷酸的增加激活焦磷酸：果糖-6-磷酸磷酸转移酶来调节的。
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