Blue light and abscisic acid independently induce heterophyllous switch inMarsilea quadrifolia

Authors
Citation
Bl. Lin et Wj. Yang, Blue light and abscisic acid independently induce heterophyllous switch inMarsilea quadrifolia, PLANT PHYSL, 119(2), 1999, pp. 429-434
Citations number
40
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
PLANT PHYSIOLOGY
ISSN journal
0032-0889 → ACNP
Volume
119
Issue
2
Year of publication
1999
Pages
429 - 434
Database
ISI
SICI code
0032-0889(199902)119:2<429:BLAAAI>2.0.ZU;2-V
Abstract
In natural habitats Marsilea quadrifolia L. produces different types of lea ves above and below the water level. In aseptic cultures growth conditions can be manipulated so that leaves of the submerged type are produced contin uously. Under such conditions the application of either blue light or an op timal concentration of abscisic acid (ABA) induced the development of aeria l-type leaves. When fluridone, an inhibitor of ABA biosynthesis, was added to the culture medium it did not prevent blue light induction of aerial lea f development. During blue light treatment the endogenous ABA level in M. q uadrifolia leaves remained unchanged. However, after the plants were transf erred to an enriched medium, the ABA level gradually increased, correspondi ng to a transition in development from the submerged type of leaves to aeri al leaves. These results indicate that the blue light signal is not mediate d by ABA. Therefore, in the regulation of heterophyllous determination, dis crete pathways exist in response to environmental signals.