Factors Affecting the Development of Flue‐Cured Tobacco Grown in Artificial Environments. I. Effects of Light Duration and Temperature on Physical Properties of Fresh Leaves1

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Abstract
Tobacco (Nicotiana tabacum L. ‘Coker 319‘) plants were grown to maturity in the facilities of the North Carolina State University Phytotron (Southeastern Plant Environment Laboratory) to determine effects of temperature and light duration on the physical characteristics of fresh leaves. Leaf area, shape, and specific leaf weight (dry weight per unit leaf surface area) were determined at six stalk positions. The lower temperatures resulted in small, relatively wide leaves at the base of the plant and elongated leaves at the top. Higher temperatures tended to reverse the normal shape and size ordering sequence of leaves; at the highest temperature condition the largest, as well as the broadest, leaves were developed at the uppermost stalk positions. The specific leaf weight was increased by an increase in the duration of the high intensity light period and by decreases in temperature. The increased light duration also enhanced the relative width of leaves.

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