Plant Physiol.
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Blue Light and Abscisic Acid Independently Induce Heterophyllous Switch in Marsilea quadrifolia1

Bai-Ling Lin* and Wen-Jen Yang2

Institute of Molecular Biology, Academia Sinica, Nankang, Taipei 115, Taiwan, Republic of China (B.-L.L., W.-J.Y.); and Graduate Institute of Biotechnology, Chinese Culture University, Taipei 111, Taiwan, Republic of China (W.-J.Y.)

In natural habitats Marsilea quadrifolia L. produces different types of leaves above and below the water level. In aseptic cultures growth conditions can be manipulated so that leaves of the submerged type are produced continuously. Under such conditions the application of either blue light or an optimal concentration of abscisic acid (ABA) induced the development of aerial-type leaves. When fluridone, an inhibitor of ABA biosynthesis, was added to the culture medium it did not prevent blue light induction of aerial leaf development. During blue light treatment the endogenous ABA level in M. quadrifolia leaves remained unchanged. However, after the plants were transferred to an enriched medium, the ABA level gradually increased, corresponding to a transition in development from the submerged type of leaves to aerial leaves. These results indicate that the blue light signal is not mediated by ABA. Therefore, in the regulation of heterophyllous determination, discrete pathways exist in response to environmental signals.

1   This work was supported by grants to B.-L.L. from Academia Sinica and the National Science Council (no. NSC85-2311-B-001-091), Republic of China.
2   Present address: Graduate Institute of Life Sciences, National Sun Yat-sen University, Kaoshiung 804, Taiwan, Republic of China.
*   Corresponding author; e-mail mblbl{at}ccvax.sinica.edu.tw; fax 886-2-2788-3739.

Plant Physiol. (1999) 119: 429-434
Copyright Clearance Center:   0032-0889/99/119//06
© 1999 American Society of Plant Physiologists




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