Plant and Cell Physiology, 1982, Vol. 23, No. 3 427-431
© 1982
Article |
Temperature-dependent Inhibition of Hypocotyl Elongation in Some Soybean Cultivars: I. Localization of Ethylene Evolution and Role of Cotyledons1
Department of Plant Pathology, Seed and Weed Sciences and Department of Botany, Iowa State University Ames, Iowa 50011, U.S.A.
Apical 2-cm hypocotyl segments from seedlings of a "short-hypocotyl" cultivar Amsoy 71, like whole seedlings, evolve about twice as much ethylene at 25°C as at 30°C. Segments consisting of two cotyledons and an attached epicotyl evolve ethylene at low rates at both 25°C and 30°C. Hypocotyl segments from seedlings of Cutler 71 also show enhanced ethylene evolution at 25°C. Hypocotyl segments from Corsoy, a "long hypocotyl" cultivar, however, evolve ethylene at low rates at both 25°C and 30°C. Wounding of Amsoy 71 hypocotyl segments does not increase their ethylene evolution. Ethylene evolution at 25°C is reduced and the short-hypocotyl phenomenon is reversed by partial (50%) removal of Amsoy 71 cotyledons at planting time.
1 Journal Paper No. J-10412 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, U.S.A. Project 2191.
(Received October 5, 1981; Accepted January 28, 1982)
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