The effect of gravity on surface temperatures of plant leaves

Yoshiaki Kitaya, M. Kawai, J. Tsuruyama, H. Takahashi, A. Tani, E. Goto, T. Saito, M. Kiyota

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    A fundamental study was conducted to develop a facility having an adequate air circulation system for growing healthy plants over a long-term under microgravity conditions in space. To clarify the effects of gravity on heat exchange between plant leaves and the ambient air, surface temperatures of sweet potato and barley leaves and replica leaves made of wet paper and copper were evaluated at gravity levels of 0.01, 1.0, 1.5 and 2.0 g for 20 s each during parabolic aeroplane flights. Thermal images were captured using infrared thermography at an air temperature of 26°C, a relative humidity of 18% and an irradiance of 260 W m-2. Mean leaf temperatures increased by 0.9-1.0°C with decreasing gravity levels from 1.0 to 0.01 g and decreased by 0.5°C with increasing gravity levels from 1.0 to 2.0 g. The increase in leaf temperatures was at most 1.9°C for sweet potato leaves over 20 s as gravity decreased from 1.0 to 0.01 g. The boundary layer conductance to sensible heat exchange decreased by 5% when the gravity decreased from 1.0 to 0.01 g at the air velocity of 0.2 m s-1. The decrease in the boundary layer conductance with decrease in the gravity levels was more significant in a lower air velocity. Heat exchange between leaves and the ambient air was more retarded at lower gravity levels because of less sensible and latent heat transfers with less heat convection.

    Original languageEnglish
    Pages (from-to)497-503
    Number of pages7
    JournalPlant, Cell and Environment
    Volume26
    Issue number4
    DOIs
    Publication statusPublished - 2003 Apr 1

    Keywords

    • Barley
    • Heat convection
    • Infrared thermography
    • Leaf temperature
    • Microgravity
    • Parabolic aeroplane flights
    • Space
    • Sweet potato

    ASJC Scopus subject areas

    • Physiology
    • Plant Science

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