期刊
JOURNAL OF PLANT NUTRITION
卷 36, 期 7, 页码 1138-1159出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2013.780613
关键词
deficiency; metabolite; phosphorus; rice; root exudate
资金
- Japan Society for the Promotion of Science (JSPS) [23580086, 23380041]
We applied a metabolite profiling technique to investigate root exudates under phosphorus (P) deficiency. Oryza sativa was grown in culture solution containing three P levels (0, 1, and 8mg P L-1). Shoot extracts, root extracts, and root exudates were obtained from 18 and 23-day-old plants and their metabolites were determined by capillary electrophoresis/time-of-flight mass spectrometry. Eighty, 90, and 65 metabolites were identified in shoot extracts, root extracts, and root exudates, respectively. Sixty-three to eighty-four percent of the metabolites were exuded to the rhizosphere. More than 33% of the metabolites in the root exudates showed higher concentration at low P than at high P. On the other hand, only 14% of the metabolites in the root extracts showed lower concentration at low P than at high P. These results suggest that rice roots actively release many metabolites in response to P deficiency.
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