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dc.contributor.authorRay, I. M.
dc.contributor.authorSisson, W. B.
dc.date.accessioned2020-09-24T03:44:43Z
dc.date.available2020-09-24T03:44:43Z
dc.date.issued1986-11-01
dc.identifier.citationRay, I. M., & Sisson, W. B. (1986). Nitrate reductase activity of kleingrass (Panicum coloratum L.) during drought in the northern Chihuahuan Desert. Journal of Range Management, 39(6), 531-535.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/3898765
dc.identifier.urihttp://hdl.handle.net/10150/645367
dc.description.abstractPlant nitrate (NO_3-N) uptake rates are often low in desert environments because soil nitrogen levels are typically low, and mineralization and nitrification of nitrogen is moisture-dependent. During drought, leaf tissue NO_3-N levels toxic to grazing animals can result because the enzyme responsible for NO_3-N reduction (nitrate reductase; NR) is repressed during plant water stress. Seasonal leaf NR activity (in vivo), and NO_3-N, total nitrogen, and leaf water (%) content of kleingrass (Panicum coloratum L.) plants growing in situ in the northern Chihuahuan Desert were determined. Total precipitation during the April through November growing season (11.5 cm) was 40% less than the long-term average (19 cm). This drought resulted in low NR activity, repressed plant growth, and water-stressed plants through most of the growing season. Seasonal and diurnal leaf NR activities were positively correlated (P<.05) with leaf water contents (%) and leaf water potentials, respectively. The latter correlation was significant only with young leaf tissue. Young leaf tissue reduced 29.6 micromol NO_3-N gDW-1 on 14 July when leaf water potentials exceeded -3.0 MPa. On 18 May, 7.1 micromol NO_3-N gDW-1 were reduced when older leaf tissue was present and leaf water potentials did not exceed -3.0 MPa. Leaf NO_3-N accumulated to levels toxic to livestock during August, September, and October. The stem plus leaf sheath component of the aboveground biomass was the primary site for NR activity, and nitrogen and biomass allocation during 6 phenological stages (second through fifth leaf stages, and boot and immature seed stages). Immature seeds comprised only 12.3% of the aboveground biomass and possessed 29.9% of the nitrogen and 62.2% of the total capacity of NO_3-N reduction.
dc.language.isoen
dc.publisherSociety for Range Management
dc.relation.urlhttps://rangelands.org/
dc.rightsCopyright © Society for Range Management.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectnitrate reductase
dc.subjectPanicum coloratum
dc.subjectenzyme activity
dc.subjectnitrogen metabolism
dc.subjectdevelopmental stages
dc.subjectnitrate nitrogen
dc.subjectdeserts
dc.subjectleaf water content
dc.subjectleaf water potential
dc.subjectdrought
dc.subjectNew Mexico
dc.subjectwater stress
dc.titleNitrate Reductase Activity of Kleingrass (Panicum Coloratum L.) During Drought in the Northern Chihuahuan Desert
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
dc.description.noteThis material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.
dc.description.collectioninformationThe Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform August 2020
dc.source.volume39
dc.source.issue6
dc.source.beginpage531-535
refterms.dateFOA2020-09-24T03:44:43Z


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