Variations in transpiration rate and leaf cell turgor maintenance in saplings of deciduous broad-leaved tree species common in cool temperate forests in Japan

Takami Saito, Tadashi Tanaka, Hiromi Tanabe, Yoosuke Matsumoto, Yasushi Morikawa

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    To clarify mechanisms underlying variation in transpiration rate among deciduous broad-leaved tree species, we measured diurnal changes in stomatal conductance (gs) and leaf water potential, and calculated the maximum transpiration rate (Emax), leaf-specific hydraulic conductance (Ks-l) and difference between the soil water potential and the daily minimum leaf water potential (Ψsl,min). Pressure-volume (P-V) measurements were made on leaves. Saplings of eight broad-leaved tree species that are common in Japanese cool temperate forests were studied. Maximum transpiration rate varied significantly among species. There was a statistically significant difference in Ψsl,min, but not in Ks-l. Species with large Emax also had large Ψsl,min and gs. The results of the P-V analyses showed that species with a large Ψsl,min maintained turgor even at low leaf water potentials. The similar daily minimum leaf pressure potentials (Ψp) across all eight species indicate that Ψp values below this minimum are critical. Based on these results, we suggest that the leaf cell capacity for turgor maintenance strongly affects Ψsl,min and consequently Emax via stomatal regulation.

    Original languageEnglish
    Pages (from-to)59-66
    Number of pages8
    JournalTree Physiology
    Issue number1
    Publication statusPublished - 2003 Jan



    • Hydraulic conductivity
    • Pressure-volume curve
    • Soil-plant-atmospheric continuum (SPAC)
    • Stomatal conductance

    ASJC Scopus subject areas

    • Forestry
    • Plant Science

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