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Annals of Botany 40: 837-843, 1976
© 1976 Annals of Botany Company

RESEARCH-ARTICLE

Development of Leaf Forms in Ipomoea reptans (Linn.) Poir

P. C. DATTA and NITA SAHA

Department of Botany, University of Calcutta Calcutta 700019, India

Received: 12 February 1974   

Development of leaves of two chromosomal biotypes of Ipomoea reptans, one with broad leaves and the other with narrow leaves, was studied. Early development of the ‘narrow’ type involves a rapid multiplication of cells without expansion. This phase is followed by cell enlargement with a negligible amount of multiplication. In the ‘broad’ type on the other hand, multiplication and enlargement are simultaneous and proceed slowly, but steadily. The lamina shape of both the biotypes is primarily related to a difference of cell multiplication rate in the basal, median and apical parts. Some gradient influencing cell multiplication probably exists from the base to the tip of lamina, the optimum point being in the middle. Maturation and enlargement of cells is basipetal and continuous. The wavy nature of the leaf margin is related to a very accurate geometrical adjustment of cell number variation in depressions and mounds, which may be controlled by a product of the lateral veins.


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