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Plant Physiol, November 1999, Vol. 121, pp. 715-722
Expression of Endoxyloglucan Transferase Genes in
acaulis Mutants of Arabidopsis1
Taku
Akamatsu,
Yoshie
Hanzawa,
Yuhko
Ohtake,
Taku
Takahashi,
Kazuhiko
Nishitani, and
Yoshibumi
Komeda*
Division of Biological Sciences, Graduate School of Science,
Hokkaido University, N10, W8, Sapporo 060-0810, Japan (T.A., Y.H.,
Y.O., T.T., Y.K.); and Department of Biology, Graduate School of
Science, Tohoku University, Aoba, Sendai 980-8578, Japan (K.N.)
A mutant of Arabidopsis with reduced
internodal cell length, acaulis5 (acl5),
has recently been shown to have reduced transcript levels of a gene for
endoxyloglucan transferase, EXGT-A1 (Y. Hanzawa, T. Takahashi, Y. Komeda [1997] Plant J 12: 863-874). In the
present study, we cloned genomic fragments of five members of the
EXGT gene family, EXGT-A1,
EXGT-A3, EXGT-A4, XTR2,
and XTR3, and examined their expression in the wild type
and in a series of acl mutants. In wild-type plants, the
EXGT-A3 gene showed higher expression in lower
internodes (internodes between nodes bearing axillary shoots) than in
upper and young internodes, in which EXGT-A1 was highly
expressed. EXGT-A4 was preferentially expressed in roots and XTR3 in siliques. The XTR2 gene was
constitutively expressed. In acl1, acl3,
and acl4 mutants, which have a severe defect in leaf
expansion as well as in internode elongation, the
EXGT-A1 gene showed reduced levels of expression before
bolting of plants. In contrast, XTR3 was increased in
these mutant seedlings. Reduction of EXGT-A1 expression
was also detected after bolting of all acl mutants
except acl2, whose growth defect is restricted to lower internodes. These results suggest the involvement of each EXGT in
different aspects of organ development.
1
This work was partially supported by a
Grant-In-Aid from the Ministry of Education, Science and Culture of
Japan and by a grant for the Research for the Future Program from the
Japan Society for the Promotion of Science (JSPSRFTF96L00403).
*
Corresponding author; e-mail ykomeda{at}bio.sci.hokudai.ac.jp; fax
81-11-706-2739.
© 1999 American Society of Plant Physiologists
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