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Plant Physiology 78:296-299 (1985)
© 1985 American Society of Plant Biologists

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Articles

Chlorophyll-Proteins and Electron Transport during Iron Nutrition-Mediated Chloroplast Development

John N. Nishio1, Javier Abadía2 and Norman Terry

Department of Plant and Soil Biology, University of California, Berkeley, California 94720

Chlorophyll-protein complexes and electron transport activities were measured during iron nutrition-mediated chloroplast development in sugar beet (Beta vulgaris L. cv F58-554H1). Results showed that the chlorophyll-protein complexes associated with the reaction centers of photosystem I (CP1) and photosystem II (CPa) and the electron transport activities of these two photosystems per leaf area increased rapidly during the first 24 to 48 hours of iron resupply to iron-deficient sugar beet plants. Bulk chlorophyll and the amounts of light-harvesting chlorophyll-proteins increased after a lag period of 24 hours. The changes in chlorophyll-proteins with time were apparently the cause of an initial increase, then decrease, in the chlorophyll a/b ratio during iron resupply. There was evidence that iron deficiency diminished photosystem I more than photosystem II. We propose that there are two distinct phases in iron nutrition-mediated chloroplast development: (a) the commencement of the synthesis of the lipid matrix of the thylakoid membrane, including a fully functioning electron transport (and photosynthetic) system, during the first 24 hours of iron resupply; and (b) after 24 to 48 hours, the formation of the bulk of the thylakoid proteins, including the light-harvesting chlorophyll-proteins with which the large increase in total chlorophyll is associated.

1 Present address: Department of Botany and Plant Sciences, University of California, Riverside, CA 92521.

2 Recipient of a postdoctoral fellowship from the Spanish Superior Council of Scientific Research (C.S.I.C.). Permanent address: Estación Experimental de Aula Dei (C.S.I.C.), Apartado 202, Zaragoza, Spain.






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Copyright © 1985 by the American Society of Plant Biologists