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    • Journal of Range Management, Volume 53 (2000)
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    Seed production in sideoats grama populations with different grazing histories

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    Author
    Smith, S. E.
    Mosher, R.
    Fendenheim, D.
    Issue Date
    2000-09-01
    Keywords
    apomixis
    selection pressure
    Bouteloua curtipendula
    inflorescences
    plant morphology
    seed productivity
    genetic effects
    grazing
    Arizona
    Bouteloua
    defoliation tolerance
    evolution
    grazing resistance
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    Citation
    Smith, 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.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/643807
    DOI
    10.2307/4003657
    10.2458/azu_jrm_v53i5_smith
    Additional Links
    https://rangelands.org/
    Abstract
    Frequent 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.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4003657
    Scopus Count
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    Journal of Range Management, Volume 53, Number 5 (September 2000)

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