Division of Irrigation Research, Commonwealth Scientific and Industrial Research Organization, Griffith, N.S.W., Australia.
Plant Physiol. 1973 Apr;51(4):744-8. doi: 10.1104/pp.51.4.744.
Expanding leaves of Capsicum frutescens L. cv. California Wonder, Cucumis melo L. cv. Hales Best, and Citrus sinensis L. Osbeck cv. Washington Navel showed a marked diurnal periodicity in the incorporation of (14)C from photosynthetically fixed (14)CO(2) into amino acids. Incorporation was virtually nil at the beginning of the photoperiod, reached a maximum in the 6th to 7th hour and decreased during the latter part of the photoperiod. In Capsicum frutescens this was apparently a reflection of the availability of reduced nitrogen controlled by the activity of nitrate reductase in the leaves. This also controlled the periodicity of the incorporation of (14)C into fraction I protein. Possible control mechanisms and the relation of nitrogen metabolism to the periodicity of leaf expansion growth are discussed.
辣椒、甜瓜和脐橙叶片的光合固定（14）CO2 掺入氨基酸呈现明显的昼夜周期性。光周期开始时几乎没有掺入，在第 6 到 7 小时达到最大值，在光周期的后期减少。在辣椒中，这显然反映了叶片中硝酸还原酶活性控制的还原氮的可利用性。这也控制了（14）C 掺入 I 部分蛋白质的周期性。讨论了可能的控制机制以及氮代谢与叶片扩展生长周期性的关系。
