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Plant Physiology 81:26-29 (1986)
© 1986 American Society of Plant Biologists

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Characterization of Water Stress and Low Temperature Effects on Flower Induction in Citrus 1

Stephen M. Southwick and Thomas L. Davenport

Tropical Research and Education Center, University of Florida, IFAS, Homestead, Florida 33031

Experiments were conducted with containerized `Tahiti' lime (Citrus latifolia Tan.) trees in order to define conditions needed to induce flowering. Cyclical or continuous water stress for 4 to 5 weeks induced flowering. Moderate (–2.25 megapascals, midday) or severe (–3.5 megapascals, midday) water stress as measured by leaf xylem pressure potential, for as little as 2 weeks induced flowering, but the response was more significant in severely stressed trees. Low temperature (18°C day/10°C night) induced a time dependent flowering response much like that of moderate water stress. Significantly negative leaf xylem pressure potentials as compared to controls were found only under water stress treatment, suggesting that a common stress-linked event, separate from low plant water potential is involved in floral induction. Leafless, immature cuttings from mature, field-grown trees were induced to flower by water stress treatment, suggesting that leaves are not essential for a flower inductive response.

1 Florida Agricultural Experiment Stations Journal Series No. 6738.




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Copyright © 1986 by the American Society of Plant Biologists