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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Growth and nodulation of symbiotic Medicago truncatula at different levels of phosphorus availability
Journal of Experimental Botany, Volume 64, No. 10, Year 2013
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Description
Medicago truncatula is an important model plant for characterization of P deficiency on leguminous plants at the physiological and molecular levels. Growth optimization of this plant with regard to P supply is the first essential step for elucidation of the role of P in regulation of nodulation. Hence, a study was carried out to address the growth pattern of M. truncatula hydroponically grown at different gradual increases in P levels. The findings revealed that M. truncatula had a narrow P regime, with an optimum P level (12 μM P) which is relatively close to the concentration that induces P toxicity. The accumulated P concentration (2.7 mg g-1 dry matter), which is normal for other crops and legumes, adversely affected the growth of M. truncatula plants. Under P deficiency, M. truncatula showed a higher symbiotic efficiency with Sinorhizobium meliloti 2011 in comparison with S. meliloti 102F51, partially as a result of higher electron allocation to N2 versus H+. The total composition of free amino acids in the phloem was significantly affected by P deprivation. This pattern was found to be almost exclusively the result of the increase in the asparagine level, suggesting that asparagine might be the shoot-derived signal that translocates to the nodules and exerts the down-regulation of nitrogenase activity. Additionally, P deprivation was found to have a strong influence on the contents of the nodule carbon metabolites. While levels of sucrose and succinate tended to decrease, a higher accumulation of malate was observed. These findings have provided evidence that N2 fixation of M. truncatula is mediated through an N feedback mechanism which is closely related to nodule carbon metabolism. © The Author(2) [2013].
Authors & Co-Authors
Sulieman, Saad A.
Japan, Yokohama
Riken Center for Sustainable Resource Science
Germany, Gottingen
Georg-august-universität Göttingen
Sudan, Khartoum
Khartoum University
van Ha, Chien Van
Japan, Yokohama
Riken Center for Sustainable Resource Science
Schulze, Joachim
Germany, Gottingen
Georg-august-universität Göttingen
Tran, Lam Son Phan
Japan, Yokohama
Riken Center for Sustainable Resource Science
Statistics
Citations: 114
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1093/jxb/ert122
ISSN:
00220957
e-ISSN:
14602431
Research Areas
Environmental