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Photosynthesis and Stomatal Behavior in Sugarcane Leaves as Affected by Light Intensity and Low Air Flow Rates
Author(s) -
IRVINE JAMES E.
Publication year - 1971
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1971.tb03517.x
Subject(s) - photosynthesis , light intensity , intensity (physics) , botany , horticulture , porosity , biology , chemistry , physics , quantum mechanics , optics , organic chemistry
Increased air flow and light intensity increased the rate of photosynthesis of attached sugarcane leaves. At constant, low flow rates greater photosynthetic rates, leaf porosity, and stomatal opening accompanied increased light intensity. At constant light intensity, greater photosynthetic rates but lesser porosity and lesser stomatal opening accompanied increased air flow. The highest rate of photosynthesis (53 mg dm –2 h –1 ) was observed when both air flow and light intensity were at a maximum, even though porosity was minimal and no stomata appeared open. It is concluded that stomataL resistance of sugarcane leaves does not control rates of photosynthesis except when that resistance is very high.