Evidence for a graft-transmissible substance which delays apical senescence in Pisum sativum L. |
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| Authors: | W. M. Proebsting P. J. Davies G. A. Marx |
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| Affiliation: | (1) Section of Genetics, Development and Physiology, Division of Biological Sciences, Cornell University, 14853 Ithaca, NY, USA;(2) Department of Seed and Vegetable Sciences, New York State Agricultural Station, 14456 Geneva, NY, USA |
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| Abstract: | Apical senescence in an early flowering line of pea, G2, is greatly delayed by short days. This behavior is controlled by two dominant genes. Apical senescence of ungrafted, insensitive (I) lines is unaffected by photoperiod. When I-type scions with one of the two required genes were grafted onto G2, apical senescence of the I-type was delayed in short days, but not in long days. Flowering of the I-type was unaffected. The apex of the G2 stock was unaffected as well. Apical senescence of an I-type line lacking both photoperiod genes was not delayed when grafted on G2 in short days. It is concluded that G2 plants grown in short days produce a graft-transmissible factor which delays apical senescence of photoperiodically insensitive lines. |
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| Keywords: | Apical senescence Pisum Photomorphogenesis Grafting Growth regulators Senescence |
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