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Evidence for the Critical Role of Sucrose Synthase for Anoxic
Tolerance of Maize Roots using a Double Mutant
Bérénice Ricard*,
Tara Van Toai,
Prem Chourey, and
Pierre Saglio
Station de Physiologie Végétale, Institut National de
la Recherche Agronomique, Centre de Recherches de Bordeaux, B.P. 81, 33883 Villenave d'Ornon cedex, France (B.R., P.S.); Soil Drainage
Research Unit, United States Department of Agriculture-Agricultural
Research Service, 590 Woody Hayes Drive, Columbus, Ohio 43210 (T.V.T.); and United States Department of Agriculture-Agricultural Research
Service and Program in Plant Molecular and Cellular Biology, University
of Florida, Gainesville, Florida 32611-0680 (P.C.)
The induction of the sucrose synthase
(SuSy) gene (SuSy) by low O2, low
temperature, and limiting carbohydrate supply suggested a role in
carbohydrate metabolism under stress conditions. The isolation of a
maize (Zea mays L.) line mutant for the two known SuSy genes but functionally normal showed that SuSy
activity might not be required for aerobic growth and allowed the
possibility of investigating its importance during anaerobic stress. As
assessed by root elongation after return to air, hypoxic pretreatment
improved anoxic tolerance, in correlation with the number of
SuSy genes and the level of SuSy expression.
Furthermore, root death in double-mutant seedlings during anoxic
incubation could be attributed to the impaired utilization of sucrose
(Suc). Collectively, these data provide unequivocal evidence that Suc
is the principal C source and that SuSy is the main enzyme active in
Suc breakdown in roots of maize seedlings deprived of O2.
In this situation, SuSy plays a critical role in anoxic tolerance.
*
Corresponding author; e-mail ricard{at}bordeaux.inra.fr; fax
335-56-84-32-45.
Plant Physiol. (1998) 116: 1323-1331
Copyright Clearance Center: 0032-0889/98/116/1323/09
© 1998 American Society of Plant Physiologists
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