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dc.contributor.advisorJohns, Mitrick A.en_US
dc.contributor.authorSachay, James E.en_US
dc.date.accessioned2016-02-26T17:27:51Z
dc.date.available2016-02-26T17:27:51Z
dc.date.issued1990
dc.identifier.urihttp://commons.lib.niu.edu/handle/10843/15779
dc.descriptionIncludes bibliographical references (pages [60]-68)en_US
dc.description.abstractPhosphate-stress was determined in the monocot Zea mays. Definition of phosphate-stress was investigated by growing plants with and without phosphate in defined nutrient solution and measuring a number of parameters. These parameters included (1) measurements of shoot and root, (2) weight of shoot and root, (3) phosphatase activity present in the root, and (A) total phosphate levels of shoot and root. Conclusions of this study showed that phosphate-stressed corn had increased root growth, while shoot growth decreased. Not only were phosphate-starved roots longer, but they were less massive and less branching than phosphate-rich roots. Phosphatase secretion increased A-fold in roots starved for phosphate. Threshold for phosphate-stress has been determined to occur between 5uM and 15uM phosphate. The soluble phosphatase secreted from the root surface has been partially purified by ion-exchange chromatography. An acid and an alkaline phosphatase with pH optima 5.5 and 7.5, respectively, were demonstrated.en_US
dc.format.extent68 pagesen_US
dc.language.isoengen_US
dc.publisherNorthern Illinois Universityen_US
dc.rightsNIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.en_US
dc.subject.lcshPhosphatesen_US
dc.subject.lcshCorn--Physiologyen_US
dc.titleDefinition of phosphate-stress in Zea maysen_US
dc.type.genreDissertation/Thesisen_US
dc.typeTexten_US
dc.contributor.departmentDepartment of Biological Sciencesen_US
dc.description.degreeM.S. (Master of Science)en_US


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