Abstract
AbstractA need to study the effect of a wide range of temperatures on early plant growth as well as seed germination of a wide range of sorghum [Sorghum bicolor (L.) Moench] germplasm led to the construction of a sand thermogradient sand table. The table was constructed so heat was transferred between water baths of two different temperatures. A continuous, linear thermogradient was established when the water baths were at 15 and 45 C. Other temperature differentials produced nearly linear gradients. Temperature deviation at any depth during the experiments never exceeded 1 C and usually was less. Germination and early growth of sorghum and corn (Zea mays L.) were measured to demonstrate the type of response curves that could be obtained with this apparatus. The table lends itself to many applications for physiological studies, including screening genetic material for temperature tolerance.
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