Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 10 June 1977:
Vol. 196. no. 4295, pp. 1201 - 1203
DOI: 10.1126/science.196.4295.1201
Prev | Table of Contents | Next

Articles

Phyllotaxis in Xanthium Shoots Altered by Gibberellic Acid

ROMAN MAKSYMOWYCH 1 and RALPH O. ERICKSON 2

1 Department of Biology, Villanova University, Villanova, Pennsylvania 19085
2 Department of Biology, University of Pennsylvania, Philadelphia 19174

Gibberellic acid treatment of vegetative Xanthium shoots induced a change in phyllotaxis and almost doubled the rate of leaf production. Phyllotaxis in control plants displayed a 2,3 contact parastichy pattern; that of the treated plants could be approximated with a 3,5 pattern. Thus, the Xanthium apex switched to a new mode of growth and a higher order of phyllotactic leaf arrangement not seen in untreated plants. It may be inferred from these experiments that gibberellic acid plays a role in determining the site of leaf initiation.

Submitted on December 17, 1976


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
PLASTOCHRON1, a timekeeper of leaf initiation in rice, encodes cytochrome P450.
K. Miyoshi, B.-O. Ahn, T. Kawakatsu, Y. Ito, J.-I. Itoh, Y. Nagato, and N. Kurata (2004)
PNAS 101, 875-880
   Abstract »    Full Text »    PDF »
Abscisic Acid Induces Formation of Floating Leaves in the Heterophyllous Aquatic Angiosperm Potamogeton nodosus.
L. W. J. ANDERSON (1978)
Science 201, 1135-1138
   Abstract »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)