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Plant Physiol, March 2000, Vol. 122, pp. 853-860
Characterization of XET-Related Genes of Rice
Sakurako
Uozu,*
Miyako
Tanaka-Ueguchi,
Hidemi
Kitano,
Kazumi
Hattori, and
Makoto
Matsuoka
Graduate School of Bioagricultural Science and BioScience Center,
Nagoya University, Chikusa, Nagoya 464-8601, Japan
To elucidate the mechanism of
internodal elongation in rice (Oryza sativa L.), we
analyzed genes encoding xyloglucan endotransglycosylase (XET), a cell
wall-loosening enzyme essential for cell elongation. Four rice
XET-related (XTR) genes,
OsXTR1, OsXTR2,
OsXTR3, and OsXTR4, were isolated and
their expression patterns in rice plants determined. The expression of
the four XTR genes showed different patterns of organ
specificity and responses to several plant hormones. OsXTR1 and OsXTR3 were up-regulated by
gibberellin and brassinosteroids, whereas OsXTR2 and
OsXTR4 showed no clear response to these hormones. Expression of the four XTR genes was also investigated
in elongating internodes at different developmental stages.
OsXTR1 and OsXTR3 were preferentially
expressed in the elongating zone of internodes, while
OsXTR2 and OsXTR4 were expressed in nodes
and in the divisional and elongating zones of internodes. In three
genetic mutants with abnormal heights, the expression of
OsXTR1 and OsXTR3 correlated with the
height of the mutants, whereas no such correlation was observed for
OsXTR2 and OsXTR4. Based on these
observations, we discuss the roles that OsXTR1 and
OsXTR3 may play in internodal elongation in rice.
*
Corresponding author; e-mail
uozu{at}nuagr1.agr.nagoya-u.ac.jp; fax 81-52-789-4017.
© 2000 American Society of Plant Physiologists
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