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dc.contributor.authorSmith, S. E.
dc.contributor.authorMosher, R.
dc.contributor.authorFendenheim, D.
dc.date.accessioned2020-09-23T05:19:00Z
dc.date.available2020-09-23T05:19:00Z
dc.date.issued2000-09-01
dc.identifier.citationSmith, S. E., Mosher, R., & Fendenheim, D. (2000). Seed production in sideoats grama populations with different grazing histories. Journal of Range Management, 53(5), 550-555.
dc.identifier.issn0022-409X
dc.identifier.doi10.2307/4003657
dc.identifier.doi10.2458/azu_jrm_v53i5_smith
dc.identifier.urihttp://hdl.handle.net/10150/643807
dc.description.abstractFrequent and intense defoliation of grasses has been associated with the evolution of "grazing morphotypes" that exhibit a variety of vegetative traits correlated with improved grazing resistance. While recovery from a seed bank is not considered an important grazing resistance mechanism, relatively little is actually known regarding seed (caryopsis) production in grazing morphotypes of caespitose grasses. The goal of this research was to compare components of seed production in 2 populations of sideoats grama (Bouteloua curtipendula var. caespitosa Gould Kapadia) from nearby sites with different histories of livestock grazing. This was done using vegetative propagules of genotypes from both populations in a greenhouse study. The study was conducted in 2 flowering seasons under conditions considered favorable for seed production. The population exposed to livestock grazing showed a genetically based decrease in seed production relative to the ungrazed population. Lower seed production per plant in the grazed population was at least partially due to reduced numbers of tillers and panicles per plant and spikes per panicle that may be associated with selection for grazing tolerance. The grazed population also exhibited lower average seed production per spike indicating lower inherent floral fertility. Seed production was not closely correlated with vegetative traits associated with increased grazing tolerance, nor was there evidence of obvious physiological trade-offs related to decreased seed production in the grazed population. Lower seed production potential in populations of sideoats grama intensively grazed by livestock may lead to reduced potential for seedling colonization.
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.subjectapomixis
dc.subjectselection pressure
dc.subjectBouteloua curtipendula
dc.subjectinflorescences
dc.subjectplant morphology
dc.subjectseed productivity
dc.subjectgenetic effects
dc.subjectgrazing
dc.subjectArizona
dc.subjectBouteloua
dc.subjectdefoliation tolerance
dc.subjectevolution
dc.subjectgrazing resistance
dc.titleSeed production in sideoats grama populations with different grazing histories
dc.typetext
dc.typeArticle
dc.identifier.journalJournal of Range Management
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.volume53
dc.source.issue5
dc.source.beginpage550-555
refterms.dateFOA2020-09-23T05:19:00Z


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