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Higher Activity of an Aldehyde Oxidase in the
Auxin-Overproducing superroot1 Mutant of
Arabidopsis thaliana1
Mitsunori Seo,
Shuichi Akaba,
Takayuki Oritani,
Marianne Delarue2,
Catherine Bellini,
Michel Caboche, and
Tomokazu Koshiba*
Department of Biology, Tokyo Metropolitan University, Hachioji-shi,
Tokyo 192-0397, Japan (M.S., S.A., T.K.); Department of Applied
Biological Chemistry, Tohoku University, Aoba-ku, Sendai 981, Japan
(T.O.); and Laboratoire de Biologie Cellulaire, Institut National de la
Recherche Agronomique, Route de Saint-Cyr, F-78026, Versailles cedex,
France (M.D., C.B., M.C.)
Aldehyde
oxidase (AO; EC 1.2.3.1) activity was measured in seedlings of wild
type or an auxin-overproducing mutant, superroot1 (sur1), of Arabidopsis thaliana. Activity
staining for AO after native polyacrylamide gel electrophoresis
separation of seedling extracts revealed that there were three major
bands with AO activity (AO1-3) in wild-type and mutant seedlings. One
of them (AO1) had a higher substrate preference for indole-3-aldehyde.
This AO activity was significantly higher in sur1 mutant
seedlings than in the wild type. The difference in activity was most
apparent 7 d after germination, the same time required for the
appearance of the remarkable sur1 phenotype, which
includes epinastic cotyledons, elongated hypocotyls, and enhanced root
development. Higher activity was observed in the root and hypocotyl
region of the mutant seedlings. We also assayed the
indole-3-acetaldehyde oxidase activity in extracts by high-performance
liquid chromatography detection of indole-3-acetic acid (IAA). The
activity was about 5 times higher in the extract of the
sur1 seedlings, indicating that AO1 also has a substrate
preference for abscisic aldehyde. Treatment of the wild-type seedlings
with picloram or IAA caused no significant increase in AO1 activity.
This result suggested that the higher activity of AO1 in
sur1 mutant seedlings was not induced by IAA accumulation and, thus, strongly supports the possible role of AO1 in
IAA biosynthesis in Arabidopsis seedlings.
1
This research was supported in part by a
Grant-in-Aid for Japan-France Joint Study on Development in Higher
Plants from the Ministry of Education, Science, Sports, and Culture,
Japan.
2
Present address; Laboratoire de Biologie et
Physiologie Vegetale, Faculte des Sciences, Universite d'Angers 2 Boulevard Lavoisier 49045 Angers cedex 01, France.
*
Corresponding author; e-mail koshiba-tomokazu{at}c.metro-u.ac.jp; fax
81-426-77-2559.
Plant Physiol. (1998) 116: 687-693
Copyright Clearance Center: 0032-0889/98/116/0687/07
© 1998 American Society of Plant Physiologists
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