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Article: Assimilation of phytate-phosphorus by the extracellular phytase activity of tobacco (Nicotiana tabacum) is affected by the availability of soluble phytate

TitleAssimilation of phytate-phosphorus by the extracellular phytase activity of tobacco (Nicotiana tabacum) is affected by the availability of soluble phytate
Authors
KeywordsInositol hexakisphosphate
Phosphate
Phosphorus
Phytase
Phytate
Tobacco
Issue Date2006
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0032-079X
Citation
Plant And Soil, 2006, v. 279 n. 1-2, p. 187-199 How to Cite?
AbstractPhytate, the major organic phosphorus in soil, is not readily available to plants as a source of phosphorus (P). It is either complexed with cations or adsorbed to various soil components. The present study was carried out to investigate the extracellular phytase activities of tobacco (Nicotiana tabacum variety GeXin No.1) and its ability to assimilate external phytate-P. Whereas phytase activities in roots, shoots and growth media of P i-fed 14-day-old seedlings were only 1.3-4.9% of total acid phosphatase (APase) activities, P starvation triggered an increase in phytase secretion up to 914.9 mU mg -1 protein, equivalent to 18.2% of total APase activities. Much of the extracellular phytase activities were found to be root-associated than root-released. The plants were not able to utilize phytate adsorbed to sand, except when insoluble phytate salts were preformed with Mg 2+ and Ca 2+ ions for supplementation. Tobacco grew better in sand supplemented with Mg-phytate salts (31.9 mg dry weight plant -1; 0.68% w/w P concentration) than that with Ca-phytate salts (9.5 mg plant -1; 0.42%), presumably due to its higher solubility. We conclude that insolubility of soil phytate is the major constrain for its assimilation. Improving solubility of soil phytate, for example, by enhancement of citrate secretion, may be a feasible approach to improve soil phytate assimilation. © Springer 2006.
Persistent Identifierhttp://hdl.handle.net/10722/54340
ISSN
2015 Impact Factor: 2.969
2015 SCImago Journal Rankings: 1.409
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLung, SCen_HK
dc.contributor.authorLim, BLen_HK
dc.date.accessioned2009-04-03T07:43:51Z-
dc.date.available2009-04-03T07:43:51Z-
dc.date.issued2006en_HK
dc.identifier.citationPlant And Soil, 2006, v. 279 n. 1-2, p. 187-199en_HK
dc.identifier.issn0032-079Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/54340-
dc.description.abstractPhytate, the major organic phosphorus in soil, is not readily available to plants as a source of phosphorus (P). It is either complexed with cations or adsorbed to various soil components. The present study was carried out to investigate the extracellular phytase activities of tobacco (Nicotiana tabacum variety GeXin No.1) and its ability to assimilate external phytate-P. Whereas phytase activities in roots, shoots and growth media of P i-fed 14-day-old seedlings were only 1.3-4.9% of total acid phosphatase (APase) activities, P starvation triggered an increase in phytase secretion up to 914.9 mU mg -1 protein, equivalent to 18.2% of total APase activities. Much of the extracellular phytase activities were found to be root-associated than root-released. The plants were not able to utilize phytate adsorbed to sand, except when insoluble phytate salts were preformed with Mg 2+ and Ca 2+ ions for supplementation. Tobacco grew better in sand supplemented with Mg-phytate salts (31.9 mg dry weight plant -1; 0.68% w/w P concentration) than that with Ca-phytate salts (9.5 mg plant -1; 0.42%), presumably due to its higher solubility. We conclude that insolubility of soil phytate is the major constrain for its assimilation. Improving solubility of soil phytate, for example, by enhancement of citrate secretion, may be a feasible approach to improve soil phytate assimilation. © Springer 2006.en_HK
dc.languageengen_HK
dc.publisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0032-079Xen_HK
dc.relation.ispartofPlant and Soilen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectInositol hexakisphosphateen_HK
dc.subjectPhosphateen_HK
dc.subjectPhosphorusen_HK
dc.subjectPhytaseen_HK
dc.subjectPhytateen_HK
dc.subjectTobaccoen_HK
dc.titleAssimilation of phytate-phosphorus by the extracellular phytase activity of tobacco (Nicotiana tabacum) is affected by the availability of soluble phytateen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0032-079X&volume=279&issue=1-2&spage=187&epage=199&date=2006&atitle=Assimilation+of+phytate-phosphorus+by+the+extracellular+phytase+activity+of+tobacco+(nicotiana+tabacum)+is+affected+by+the+availability+of+soluble+phytate+en_HK
dc.identifier.emailLim, BL: bllim@hkucc.hku.hken_HK
dc.identifier.authorityLim, BL=rp00744en_HK
dc.description.naturepostprinten_HK
dc.identifier.doi10.1007/s11104-005-1009-1en_HK
dc.identifier.scopuseid_2-s2.0-32544446000en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-32544446000&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume279en_HK
dc.identifier.issue1-2en_HK
dc.identifier.spage187en_HK
dc.identifier.epage199en_HK
dc.identifier.isiWOS:000235340600018-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLung, SC=8619522500en_HK
dc.identifier.scopusauthoridLim, BL=7201983917en_HK
dc.identifier.citeulike509999-

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