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Science 12 November 1982:
Vol. 218. no. 4573, pp. 680 - 682
DOI: 10.1126/science.218.4573.680
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Articles

Longevity of Guard Cell Chloroplasts in Falling Leaves: Implication for Stomatal Function and Cellular Aging

EDUARDO ZEIGER 1 and AMNON SCHWARTZ 1

1 Department of Biological Sciences, Stanford University, Stanford, California 94305

Guard cell chloroplasts in senescing leaves from 12 species of perennial trees and three species of annual plants survived considerably longer than their mesophyll counterparts. In Ginkgo biloba, stomata from yellow leaves opened during the day and closed at night; guard cell chloroplasts from these leaves showed fluorescence transients associated with electron transport and photophosphorylation. These findings indicate that guard cell chloroplasts are highly conserved throughout the life-span of the leaf and that leaves retain stomatal control during senescence.

Submitted on July 19, 1982


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)