Abstract
The leaves of many plant species exhibit a noticeable color change in response to water stress. A study was conducted to determine if physiological changes associated with imposed water stress could be correlated with quantifiable leaf color changes in Catharanthus roseus. The Minolta Chroma Meter CR-200 was used to measure leaf color changes during water stress in three cultivars of Catharanthus. In addition, soil and plant water content, osmotic pressure, net photosynthetic rate, transpiration rate, and stomatal conductance were determined. Two components of light, chroma and L value, showed a correlation to the water content of the plant tissue. As plant water content decreased, both chroma and L value decreased. Since a change in leaf color (or a component of color) is easily monitored, the Chroma Meter could ultimately be used to detect incipient water stress in greenhouse crops.
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