Journal of Experimental Botany, Vol 49, 1381-1386, Copyright © 1998 by Oxford University Press
J Ray and T Sinclair
Many experiments are conducted in greenhouses or growth chambers in which
plants are grown in pots. Considerable research has shown that pots can
have a limiting effect on overall plant growth. This research was
undertaken to examine the effects of pot size specifically on transpiration
response of maize (Zea mays L.) and soybean
(Glycine max L.) plants undergoing water-deficit
stress. Maize and soybean experiments were conducted similarly, but as
separate experiments. Maize plants were grown in 2.3, 4.1, 9.1, and 16.2 l
pots sealed to prevent water loss except by transpiration. For each pot
size, plants were divided into two watering regimes, a well-watered control
and a water-deficit regime. Water deficits were imposed by simply not
rewatering the pots. Soybean was examined in a similar manner, but only the
three larger pot sizes were used in the experiment. For both maize and
soybean, and in both watering regimes, there was a significant reduction of
shoot dry weight and total transpiration with decreasing pot size. However,
there were no significant differences among pot sizes in the fraction of
transpirable soil water (FTSW) point at which
transpiration began to decline (FTSW
ARTICLES
The effect of pot size on growth and transpiration of maize and soybean during water deficit stress
USDA-ARS, Agronomy Physiology Laboratory, University of Florida, PO Box 110965, Gainesville, FL 32611-0965, USA; Corresponding author
0.31 for
maize and 0.35 for soybean) or in the overall relationship of
transpiration rate to soil water content in response to water deficits.
These results indicated that, regardless of pot size or plant size, the
overriding factor determining transpirational response to drought stress
was soil water content.Keywords: Drought, maize, pot
size, transpiration
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