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Year: 2008 Volume: 133 Issue: 1

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Dependence of nitrate-induced oxalate accumulation on nitrate reduction in rice leaves.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Tian, Hua Jiang, Linrong Liu, Ee Zhang, Jianjun Liu, Fang Peng, Xinxiang
Description	Country affiliation: China Author Affiliation: Tian H ( Laboratory of Molecular Plant Physiology, College of Life Sciences, South China Agricultural University, Guangzhou 510642, China.)
Abstract	Oxalate, a common constituent in many plants, is known to play important functional roles in plants. However, excess levels of oxalate in edible parts of plants adversely affect their quality as food. Understanding the regulatory mechanism in plants, particularly in food crops, is of both scientific and practical significance. While a number of studies have shown that nitrate can efficiently induce oxalate accumulation in plants, how it elicits such an effect is not well understood. This study aimed to gain a further insight into the mechanism underlying the nitrate-induced oxalate accumulation. Nitrate-N efficiently caused oxalate accumulation in rice leaves, depending on the nitrate concentrations and treatment time. In contrast, same nitrogen molar levels of the other N forms such as nitrite, ammonium, glutamate and urea either had no effect on the accumulation or even reduced the oxalate level. When glutamate, glutamine, asparate and asparagine were added into the nutrient solution that already contained saturating concentration of nitrate, both oxalate levels and NR activity were correspondingly decreased. In all of these modes of treatment, the change in NR activity was positively paralleled to that in oxalate levels. For a further confirmation, we generated the transgenic rice plants with a NR interference gene introduced. The result further demonstrated that in the transgenic plants, unlike in wild-type plants, oxalate was no longer able to accumulate in response to the nitrate treatment even though the endogenous nitrate levels were substantially elevated. Taken together, our results suggest that the nitrate-induced oxalate accumulation in rice leaves is dependent on the NR-catalyzed nitrate reduction, rather than on nitrate itself or nitrite reduction or its downstream metabolites.
File Format	HTM / HTML
ISSN	00319317
Issue Number	2
Volume Number	133
e-ISSN	13993054
Journal	Physiologia Plantarum
Language	English
Publisher	Wiley
Publisher Date	2008-06-01
Publisher Place	Denmark
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany Nitrates Metabolism Pharmacology Oryza Sativa Drug Effects Oxalates Plant Leaves Amino Acids Down-regulation Gene Expression Regulation, Plant Nitrate Reductase Genetics Nitrogen Enzymology Rna Interference Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Cell Biology Genetics Physiology Plant Science Medicine

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