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Cross-gradient Temperature Plates for Environmental Control of Growth and Differentiation. Edward J. Trione, Biochemist, Crops Research Division, ARS, USDA, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331; Charles M. Leach, Professor of Plant Pathology, Oregon State University, Corvallis 97331. Phytopathology 60:1389-1390. Accepted for publication 10 April 1970. DOI: 10.1094/Phyto-60-1389.

Several simple apparatuses were constructed which permit the establishment of precise temp gradients that may be changed in a day-night sequence. Warm and cold temp-controlled water is supplied to opposite ends of a solid 0.25-inch-thick aluminum plate. Many small but significant experiments on the interactions of temp, light, and chemicals on the growth and development of microorganisms and tissue cultures can be carried out at the same time on these cross-gradient plates.