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Promotion by a Peptidyl Growth Factor, Phytosulfokine, of Chlorophyll Formation in Etiolated Cotyledon of Cucumber.

We examined the effects of a peptidyl growth factor, phytosulfokine-α (PSK-α), isolated from conditioned medium and known to induce the proliferation of single mesophyll cells of asparagus, and its derivatives on chlorophyll formation in etiolated cotyledons of cucumber after illumination. The chlorophyll content was increased by PSK-α treatment. Chlorophyll-content increases were not observed following either [2-5]PSK or Tyr-SO3H treatment. There was no difference between the PSK-α treatments and water controls on increasing rate of fresh weights of cotyledons. These results suggest that PSK-α has the effect of elevating the chlorophyll content in the cells.