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petit1, a Conditional Growth Mutant of Arabidopsis
Defective in Sucrose-Dependent Elongation Growth1
Tetsuya Kurata and
Kotaro T. Yamamoto*
Division of Biological Science, Graduate School of Environmental
Earth Science, Hokkaido University, Sapporo, 060-0810 Japan
The hypocotyl of Arabidopsis is well
suited for the analysis of cell elongation because it elongates without
cell division. We have isolated a new class of recessive mutants,
petit1 (pet1), which are defective in
aspects of hypocotyl elongation. The short-hypocotyl phenotype of
pet1 is caused by shortened cells. The cells of the elongation zone of the hypocotyl are often deformed.
pet1 also shows defects in elongation of the roots,
flower stalk, leaves, petals, pedicels, and siliques, and these defects
cannot be repaired by the application of auxin, gibberellin,
brassinolide, or an inhibitor of ethylene biosynthesis. The
short-hypocotyl phenotype of pet1 is pronounced only in
growth medium supplemented with sucrose, which has promotive effects on
hypocotyl elongation. In pet1 this effect is much
reduced, causing the sucrose-dependent short-hypocotyl phenotype of
pet1. pet1 accumulates more soluble sugars than the wild type and also shows more intensive iodo-starch staining in the cotyledon and hypocotyl. These results indicate that
PETIT1 is involved in a sugar-dependent elongation process that may
include correct assembly of expanding cell wall architecture.
1
This work was supported in part by a
grant-in-aid from the Ministry of Education, Science and Culture of
Japan (no. 05276102 to K.T.Y.).
*
Corresponding author; e-mail kty{at}ees.hokudai.ac.jp; fax
81-11-706-2253.
Plant Physiol. (1998) 118: 793-801
Copyright Clearance Center: 0032-0889/98/118//09
© 1998 American Society of Plant Physiologists
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