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

1982; American Association for the Advancement of Science; Volume: 218; Issue: 4573 Linguagem: Inglês

10.1126/science.218.4573.680

1095-9203

Eduardo Zeiger, Amnon Schwartz,

Ginkgo biloba and Cashew Applications

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.