Phosphate Deficiency in Maize. II. Enzyme Activities |
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Authors: | Usuda Hideaki; Shimogawara Kousuke |
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Institution: | Laboratory of Chemistry, Faculty of Medicine, Teikyo University Ohtsuka, Hachioji, Tokyo, 192-03 Japan |
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Abstract: | Low-phosphate (P) treatment decreased photosynthetic rates ofmaize plants (Zea mays L.) by about 50% 18 to 19 days afterplanting Usuda and Shimogawara (1991) Plant Cell Physiol. 32:497]. Low-P treatment decreased the enzyme activities differentially(by 0-49%). The significance of the decreased activities ofpyruvate.Pj dikinase (by 29%), phosphoenolpyruvate carboxylase(by 49%), and ribulose 1,5-bisphosphate carboxylase (by 42%)in the detrimental effects of low-P treatments on the ratesof photosynthesis is discussed. (Received August 9, 1991; Accepted October 1, 1991) |
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