The Effect of Light Intensity on Stomate Number and Density of Phaseolus vulgaris L. Leaves

Stomate density and leaf area were determined for four groups of Phaseolus vulgaris L. (red kidney bean) plants, which had been grown at 2,000, 4,000, 6,000 and 8,000 ft-c light intensity. The plants were grown in nutrient solution in growth chambers, with all other conditions held constant. Measurements were made from the third trifoliate leaf after a 20-day growing period in the chambers. Variance analysis revealed that those plants grown at 2,000 ft-c had a significantly greater leaf area than those grown at 4,000, 6,000, or 8,000 ft-c The plants grown at 8,000 ft-c had significantly less leaf area than those grown at 4,000 or 6,000. The stomate density was significantly greater for those plants grown at 8,000 ft-c and significantly less at 2,000 compared with the two intermediate light levels. However, the total stomate number per trifoliate leaf did not vary significantly among the four light levels.

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