Changes with leaf age in stomatal function and water status of several tropical tree species

P. B. Reich, R. Borchert

Research output: Contribution to journalArticle

44 Scopus citations

Abstract

Changes with leaf age in diffusive resistance (r1) and xylem pressure potential (Pp were monitored in leaves of five tropical tree species. In all species, very young, expanding leaves had high r1 and Pp in situ and wilted soon after being excised. Among fully expanded leaves, stomatal control declined with increasing age, especially in the deciduous species. In Tabebuia rosea, intact older leaves had lower r1 and greater water deficits than younger leaves. In T. rosea and Cordia glabra, excised older leaves had higher transpiration rates and wilted sooner than younger leaves. Also, old T. rosea (but not C. glabra) leaves had lower r1 at night than younger leaves. In Licania arborea, Anacardium excelsium and Mangifera indica, intact older leaves had higher r1 and a smaller range of r1 than younger leaves and displayed less stomatal closure following excision. M. indica and L. arborea leaves had the most sensitive stomatal response and the best control of water loss, even when detached; these species remained evergreen and continued to grow even during seasonal drought. Stomatal control of water loss was poorest in T. rosea, which is leafless 4-6 months each year. -from Authors

Original languageEnglish (US)
Pages (from-to)60-69
Number of pages10
JournalBiotropica
Volume20
Issue number1
DOIs
StatePublished - Jan 1 1988
Externally publishedYes

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