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Plant Physiology 85:10-12 (1987)
© 1987 American Society of Plant Biologists

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Development and Growth Regulation

Role of Catecholamines in Promotion of Flowering in a Short-Day Duckweed, Lemna paucicostata 6746 1

J. P. Khurana2, B. K. Tamot3, N. Maheshwari and S. C. Maheshwari

Unit for Plant Cell and Molecular Biology and Department of Botany, University of Delhi, Delhi-110007, India

L-Epinephrine, L-norepinephrine, and L-isoproterenol substantially promote flowering under a photoperiodic regime of 8 hours light and 16 hours darkness in Lemna paucicostata 6746 when grown on the modified Bonner-Devirian medium devoid of ethylenediaminetetraacetic acid. If catecholamines are provided to plants at 10–4 molar level prior to transferring them to the short-day regime, they not only induce more floral primordia but also significantly improve flower development and sustain the flowers for a longer period. Propranolol (10–4 molar), a {beta}-adrenergic blocking agent, partially suppresses flowering and the inhibition of flowering is relieved by catecholamines.

2 Present address: MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, MI 48824.

3 Supported by a fellowship of the University Grants Commission, New Delhi.

1 Supported by the Department of Science and Technology of the Government of India.




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S. Yamaguchi, M. Yokoyama, T. Iida, M. Okai, O. Tanaka, and A. Takimoto
Identification of a Component that Induces Flowering of Lemna among the Reaction Products of {alpha}-Ketol Linolenic Acid (FIF) and Norepinephrine
Plant Cell Physiol., November 1, 2001; 42(11): 1201 - 1209.
[Abstract] [Full Text] [PDF]


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Copyright © 1987 by the American Society of Plant Biologists