Plant Physiol. Illumina
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Plant Physiology 87:458-462 (1988)
© 1988 American Society of Plant Biologists

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Development and Growth Regulation

Characteristics of Photosynthate Partitioning during Chloroplast Development in Avena Leaves

Yasunori Nakamura and Haruki Hashimoto

National Institute of Agrobiological Resources, Kannondai, Tsukuba, Ibaraki 305, Japan, Department of Biology, College of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan

The first leaves (40 millimeters long) of 4-day-old light-grown Avena sativa L. cv Victory I seedlings contained a complete age sequence of cells from the base to the tip, and within these tissues all stages of chloroplast development could be observed. Although chloroplasts underwent progressive development, a marked increase in number of thylakoids per granum, in chloroplast volume, and in chlorophyll content occurred in the region between 20 and 30 millimeters from the base. Photosynthetic CO2 fixation (per unit chlorophyll) increased markedly during chloroplast development and closely followed structural changes in chloroplasts. It was also found that the partitioning of photosynthates differed greatly in the segment from 30 to 40 millimeters (at the tip of the leaf) compared with the segment nearer to the leaf base, although both total 14CO2 fixation and chlorophyll content per segment did not change significantly along the length of the leaves. As the thylakoid system reached full maturation, partitioning of photosynthates into sucrose increased but partitioning decreased into starch, lipids, and phosphorylated intermediates.






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Copyright © 1988 by the American Society of Plant Biologists