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Abstract:

Adaptations to overcrowding of individual plants result in density dependant control of growth and development. There is little information on how anthropogenic stresses modify these responses. We investigated whether combinations of diclofop-methyl herbicide and tropospheric ozone alter the pattern of expected growth compensation with density changes resulting from intraspecific competition in Lolium multiforum Lam (Poacea) plants. Individual plant vegetative parameters and total seed production were assessed for plants growing under various densities and different herbicide rates and ozone treatments. The stressors differently changed the frequency distribution for average individual plant weight resulting from increasing densities. Only herbicide affected seedling mortality. Plants were able to compensate during grain filling maintaining similar seed production - density relationships in all treatments. Our findings contribute to the understanding of the impact of stress factors on the demographic changes in plant populations. Important ecological implications arise: (i) contrasting responses to ozone and herbicide, alone and in combination of individual plants resulted in different biomass - density relationships; (ii) stress effects on plant populations could not be predicted from individual responses; and (iii) changes in competitive outcome by single or combined stress factors may alter the expected genotype frequency in a crowded population with few dominant individuals. © 2009 Ecological Society of Australia.

Registro:

Documento: Artículo
Título:Lolium multiflorum density responses under ozone and herbicide stress
Autor:Martínez-Ghersa, M.A.; Radosevich, S.R.
Filiación:IFEVA-CONICET, Depto. de Recursos Naturales y Ambiente, Universidad de Buenos Aires, Av. San Martin 4453, Buenos Aires C1417DSE, Argentina
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR, United States
Palabras clave:Density dependence; Italian ryegrass; Lolium multiflorum; Ozone; Stress; adaptation; ecosystem response; genotype; herbicide; intraspecific competition; ozone; plant community; population density; Lolium; Lolium multiflorum
Año:2009
Volumen:34
Número:8
Página de inicio:889
Página de fin:900
DOI: http://dx.doi.org/10.1111/j.1442-9993.2009.01995.x
Título revista:Austral Ecology
Título revista abreviado:Austral Ecol.
ISSN:14429985
CODEN:AUECF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14429985_v34_n8_p889_MartinezGhersa

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Citas:

---------- APA ----------
Martínez-Ghersa, M.A. & Radosevich, S.R. (2009) . Lolium multiflorum density responses under ozone and herbicide stress. Austral Ecology, 34(8), 889-900.
http://dx.doi.org/10.1111/j.1442-9993.2009.01995.x
---------- CHICAGO ----------
Martínez-Ghersa, M.A., Radosevich, S.R. "Lolium multiflorum density responses under ozone and herbicide stress" . Austral Ecology 34, no. 8 (2009) : 889-900.
http://dx.doi.org/10.1111/j.1442-9993.2009.01995.x
---------- MLA ----------
Martínez-Ghersa, M.A., Radosevich, S.R. "Lolium multiflorum density responses under ozone and herbicide stress" . Austral Ecology, vol. 34, no. 8, 2009, pp. 889-900.
http://dx.doi.org/10.1111/j.1442-9993.2009.01995.x
---------- VANCOUVER ----------
Martínez-Ghersa, M.A., Radosevich, S.R. Lolium multiflorum density responses under ozone and herbicide stress. Austral Ecol. 2009;34(8):889-900.
http://dx.doi.org/10.1111/j.1442-9993.2009.01995.x