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The rate of chlorophyll formation in initially etiolated pea seedlings (Pisum sativum) that are growing in the light in salinized media is slower than in similar plants not subjected to salinity. However, the final steady state level of chlorophyll is the same under both conditions. Growth under saline conditions did not change the ratio of dry weight to wet weight in the plant leaves nor the specific concentration of soluble protein in leaf extracts. Changes in the specific activity of 11 enzymes in leaf extracts during growth in the light were measured. At least six of these enzymes are known to be part of the photosynthetic apparatus and that their synthesis is subject to photocontrol. The changes in specific activity that were observed were slower in the salt-treated plants, but the final steady state concentration of each was the same as in the control plants. It is concluded that salinity impairs growth of pea plants but that formation of enzymes and other proteins are always in balance with growth.

Effect of Growth in Highly Salinized Media on the Enzymes of the Photosynthetic Apparatus in Pea Seedlings