Plant Physiol. Drug Metab Dispos
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Plant Physiology 62:276-279 (1978)
© 1978 American Society of Plant Biologists

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Articles

Hormones and Young Leaves Control Development of Cotyledonary Buds in Tomato Seedlings

Louis H. Aung

John M. Byrne

Department of Horticulture, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, Department of Biological Sciences, Kent State University, Kent, Ohio 44242

Hormonal and plant factors regulating the development of the inhibited cotyledonary buds of Lycopersicon esculentum Mill. cv. `Fireball' seedlings were studied. Excision of the immature plumular leaves of 5- to 20- millimeter length significantly stimulated bud development after 2 to 4 days, but excision of leaves exceeding 20-millimeter length was without effect. Apical application of 20 microliters of 5 millimolar abscisic acid significantly promoted development of the cotyledonary buds after 6 days. A subapical ring of 0.1 millimolar concentration of 2,3,5-triiodobenzoic acid (TIBA) in lanolin significantly promoted cotyledonary bud development after 11 days. Twenty microliters of 0.1 millimolar 6-benzylaminopurine (BAP) applied directly to the cotyledonary bud loci significantly promoted bud development, but 1 micromolar gibberellin A4/7 was ineffective. Application of 0.1 millimolar BAP in lanolin to the petiole or hypocotyl was ineffective. However, application of 0.1 millimolar TIBA as a ring around the petioles of the cotyledons or 1-centimeter on the hypocotyl below the cotyledons significantly promoted cotyledonary bud development.






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Copyright © 1978 by the American Society of Plant Biologists