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Variation and correlation of stomatal frequency and transpiration rate in Phaseolus vulgaris

Variation and correlation of stomatal frequency and transpiration rate in Phaseolus vulgaris

Amer Jour Bot 28(8): 722-725

Stomatal frequency is the sum of the number of stomata in a unit area of upper and lower leaf surface. Transpiration rate is the average detd. from the same number of cobalt chloride test paper readings in each of the 2 leaf surfaces. In the leaf blades stomatal frequency was highest near the apex and lowest near the midrib, and in the different leaves it was apparently higher at the upper than at the lower levels of a plant. The variation in stomatal frequency was much greater between leaves at different levels than between the parts of a single leaf blade, but the leaves at different levels did not differ in transpiration rate any more than did the parts of a single lamina. For comparing plants with respect to transpiration rate any comparably exposed and full grown leaflet of the young plants were used. For comparing them in stomatal frequency the lower right portion of the plumular leaf was the representative sample used. There was a positive correlation of 0.431 [plus or minus] 0.062 between stomatal frequency and transpiration rate.

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Accession: 013600782

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DOI: 10.2307/2436972

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