Temperatures in Early Post‐Transplant Growth: Effect on Shape of Mature Nicotiana Tabacum L. Leaves 1

Tobacco plants ( Nicotiana tabacum L. ‘Coker 319’) were grown in controlled environment rooms under a simplified simulation of seasonal temperature progression. The temperature simulation was differentially modified only during the first 10 days of post‐transplant growth. The temperatures during this period were effective in determining the final shape of leaves from the upper half of the plant. In addition to the generally accepted role of night temperature, day temperature during this initial post‐transplant period was critical in determination of final leaf shape.