Fruit Research Division, Department of Scientific and Industrial Research, Auckland, New Zealand.
Planta. 1970 Dec;94(4):273-81. doi: 10.1007/BF00385759.
Onset of phosphorus deficiency in Spirodela oligorrhiza was accompanied by a 50-fold increase in phosphatase activity of cell extracts. The enzyme behaved like other plant acid phosphatase, and was both inhibited and repressed by inorganic phosphate. The phosphatase activity comprised at least three isozymes. Two, of low molecular weight, were present only in P-deficient Spirodela; one of high molecular weight was also present, though in smaller amounts, in normal Spirodela. Presence of 2-thiouracil during onset of P-deficiency partly inhibited the development of phosphatase activity. The nature and role of the increased phosphatase activity in P-deficient plants are discussed.
缺磷时紫萍细胞提取液中的磷酸酶活性增加了 50 倍。这种酶的性质与其他植物酸性磷酸酶相似，它既受无机磷的抑制，又受无机磷的阻遏。这种磷酸酶至少包含三种同工酶。其中两种分子量较低，仅存在于缺磷的紫萍中；另一种分子量较高，在正常紫萍中虽含量较少，但也存在。在缺磷开始时加入 2-巯基尿嘧啶，部分地抑制了磷酸酶活性的发展。本文讨论了在缺磷植物中这种增加的磷酸酶活性的性质和作用。
