The effect of gravity on surface temperature and net photosynthetic rate of plant leaves

Details The effect of gravity on surface temperature and net photosynthetic rate of plant leaves The effect of gravity on surface temperature and net photosynthetic rate of plant leaves

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001adspr..28..659k&link_type=abstract

Advances in Space Research, Volume 28, Issue 4, p. 659-664.

Physics

3

Scientific paper

To clarify the effects of gravity on heat/gas exchange between plant leaves and the ambient air, the leaf temperatures and net photosynthetic rates of plant leaves were evaluated at 0.01, 1.0, 1.5 and 2.0 G of 20 seconds each during a parabolic airplane flight. Thermal images of leaves were captured using infrared thermography at an air temperature of 26 °C, a relative humidity of 15 % and an irradiance of 260 W m-2. The net photosynthetic rates were determined by using a chamber method with an infrared gas analyzer at an air temperature of 20 °C, a relative humidity of 50 % and a photosynthetic photon flux of 0.5 mmol m-2 s-1. The mean leaf temperature increased by 1 °C and the net photosynthetic rate decreased by 13 % with decreasing gravity levels from 1.0 to 0.01 G. The leaf temperature decreased by 0.5 °C and the net photosynthetic rate increased by 7 % with increasing gravity levels from 1.0 to 2.0 G. Heat/gas exchanges between leaves and the ambient air were more retarded at lower gravity levels. A restricted free air convection under microgravity conditions in space would limit plant growth by retarding heat and gas exchanges between leaves and the ambient air.

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