Increased hexose transport in the roots of tomato plants submitted to prolonged hypoxia.
We investigated the effects of prolonged hypoxia on the sugar uptake in tomato (Solanum lycopersicum L. var. MP-1) roots. Hydroponic cultures of whole tomato plants were submitted to hypoxic treatment for 1 week, and the roots were analyzed for sugar concentrations, hexose uptake and hexose transporter expression level. Contrary to what has been observed after anoxic shock or short-term hypoxic treatment, we show that sugar concentrations increase and hexose uptake is up-regulated in the roots after 1 week of hypoxic treatment. Increased hexose transport is concomitant with the induction of the hexose transporter gene LeHT2. These responses may be due either to a direct effect of low O(2) supply, or to a secondary effect associated with the increase in sugar concentrations, which, typically, develops in most hypoxic plants.
Unité d'Ecologie Végétale, Département des Sciences Biologiques, Faculté des Sciences de Tunis, 2092, El Manar II, Tunisia. imenegharbi@yahoo.fr
Imène
I
Gharbi
Bérénice
B
Ricard
Samira
S
Smiti
Essia
E
Bizid
Renaud
R
Brouquisse
D001692:Biological Transport / Q000502:physiology; D015687:Cell Hypoxia / Q000502:physiology*; D018506:Gene Expression Regulation, Plant; D006601:Hexoses / Q000378:metabolism*; D018551:Solanum lycopersicum / Q000378:metabolism*; D009004:Monosaccharide Transport Proteins / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism*; D018517:Plant Roots / Q000378:metabolism*
D006601:Hexoses; D009004:Monosaccharide Transport Proteins; D010100:Oxygen