EFFECT OF AGE OF LEAVES UPON THE RATE OF PHOTOSYNTHESIS IN SOME CONIFERS

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Abstract
Apparent photosynthesis per unit number of leaves was detd. for 1- (current-yr.), 2-, and 3-yr.-old leaves of Pinus strobus, P. sylvestris, P. nigra, P. ponderosa, Abies concolor, and Picea pungens. Conifer leaves 3 yrs. of age still had an appreciable photosynthetic capacity. Max. apparent photosynthesis occurred approx. at the time of maturity, during the 1st yr. of growth, of leaves of all the spp. investigated. Beginning during the 2d yr., the rate of photosynthesis decreased with increasing age of the leaves. The decrease in rate with increase in age was not due to the presence of dirt on the surfaces of the older leaves.

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