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Relationship of Temperature to the Development of Calcium Deficiency Symptoms in Nicotiana tabacum¹

Tobacco (Nicotiana tabacum L.) was grown in controlled environmentalg rowthc hambersa t five different temperatures (21, 23, 26, 29, and 30 C) in two separate experiments. Plants grown at 21 and 23 C developed no Ca deficiency symptoms, and only a few plants of genetically susceptible varieties (‘Burley 21’ and Ky Exp 22) developed Ca deficiency symptoms when grown at 26 C. However, these varieties developed very severe Ca deficiency symptoms when grown at either 29 or 30 C. ‘Ky 16 ’ (nonsusceptible) and ‘Ky 12 ’ (slightly susceptible) developeds light and severe deficiency symptomast 29 C. These two varieties were grown only at the 23 and 29 C temperatures.

A moderately deficient level of K (0.6 meq/liter) resuited in appreciably less severe development of Ca deficiency symptoms. Differences due to K were slight or not apparent at higher levels of K concentration in the nutrient solutions. However, increasing the level of K nutrition resulted in a decrease in Ca content at all levels of K used.

An increase in temperature at which the plants were grown resulted in an increase in Ca accumulation in the stems. Apparently the Ca is being immobilized in the stems at higher temperatures and is failing to reach the meristem and terminal leaves, the critical portion of the plant with respect to Ca deficiency.

² Former Graduate Assistant (now Department of Chemistry, State University College of Forestry, Syracuse, N. Y.), Plant Physiologist, and Professor of AgronomyU, niversity of Kentucky.

Received for publication December 14, 1967.