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GrainGenes Reference Report: PLA-216-985

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Reference	PLA-216-985
Title	Abiotic stresses affecting water balance induce phosphoenolpyruvate carboxylase expression in roots of wheat seedlings
Journal	Planta
Year	2003
Volume	216
Pages	985-992
Author	Gonzalez MC Sanchez R Cejudo FJ
Abstract	Summary: Phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) plays an important role in CO2 fixation in C4 and CAM plants. In C3 plants, PEPC is widely expressed in most organs; however, its function is not yet clearly established. With the aim of providing clues on the function of PEPC in C3 plants, we have analyzed its pattern of expression in wheat (Triticum aestivum L.) seedlings. Roots showed almost double the level of PEPC activity of shoots. Further analysis of PEPC expression in roots by in situ localization techniques showed a high accumulation of PEPC transcripts and polypeptides in meristematic cells, whereas in the rest of the root PEPC localized preferentially to the vascular tissue. Treatment with NaCl and LiCl induced PEPC expression in roots. Similarly, other abiotic stresses affecting water status, such as drought or cold, induced PEPC expression. Induction was root-specific except for the cold treatment, which also induced PEPC in shoots, although to a lesser extent. In contrast, hypoxia, which does not affect water balance, did not promote any induction of PEPC expression. These results suggest an important role for this enzyme in the adaptation of plants to environmental changes
Keyword	[ Hide all but 1 of 38 ] abiotic stress abiotic stresses acid metabolism adaptation cell co2 fixation cold common ice plant drought enzyme fixation gene expression hypoxia in situ induction ion toxicity localization maize leaf tissue mesembryanthemum-crystallinum messenger rna nacl nitrogen-metabolism pattern phosphoenolpyruvate carboxylase regulated gene salt stress seedling signaling pathways stress tissue transcript triticum triticum aestivum vascular tissue water water balance water status wheat seedlings

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