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Plant Physiol, September 2000, Vol. 124, pp. 71-84
A Maize Vacuolar Invertase, IVR2, Is
Induced by Water Stress. Organ/Tissue Specificity and Diurnal
Modulation of Expression1
Jae-Yean
Kim,
Aline
Mahé,
Judy
Brangeon, and
Jean-Louis
Prioul*
Institut de Biotechnologie des Plantes, Centre National de
la Recherche Scientifique-Unité Mixte de Recherche 8618, Bât 630, Université de Paris-Sud, 91405, Orsay cedex,
France
The expression of invertases was analyzed in vegetative
organs of well-watered and water-stressed maize (Zea
mays) plants. Early changes in sucrose metabolism and in acid
soluble invertase expression were observed in vegetative sink and
source organs under mild water stress. The organ-specific induction of
acid invertase activity was correlated with an increase in the
Ivr2 gene transcripts and in the vacuolar invertase
proteins. In addition diurnal changes in activity and
Ivr2 transcripts for vacuolar invertase were noted in
shoots. Hexoses (glucose and fructose) accumulated in all organs
examined from water-stressed plants. In situ localization studies
showed that glucose accumulation, vacuolar invertase activity,
invertase protein, and the Ivr2 transcripts colocalized
specifically in bundle sheath and vascular tissue cells of mature
stressed leaf; in primary roots the stress-induced increase of
Ivr2 transcripts was detected only in root tips. Based on these results different regulatory roles are proposed in sink and
source organs for the stress induced Ivr2 vacuolar invertase.
1
J.-Y.K. was financially supported by the Korean government.
*
Corresponding author; e-mail prioul{at}ibp.u-psud.fr; fax
33-1- 69-33-64-24.
© 2000 American Society of Plant Physiologists
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