Fecha/hora: 07/06/2024 23:07:41

Biblioteca(s): | INIA Treinta y Tres.
Fecha corriente: | 23/07/2020
Fecha de la última actualización: | 23/07/2020
Autoria: | GUIDO, A.; QUIÑONES, A.; PEREIRA, A.L.; SILVA, E.R. DA
Afiliación: | ANACLARA GUIDO BOLIOLI, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; AMPARO QUIÑONES DELLEPIANE, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ANA LAURA PEREIRA AMATO, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; ELIANE REGINA DA SILVA, Universidade Federal do Río Grande do Sul, Instituto de Biociencias, Depto. de botanica. Porto Alegre, RS, Brazil.
Título: | Are the invasive grasses Cynodon dactylon and Eragrostis plana more phytotoxic than a co-occurring native? [¿Las gramíneas invasoras Cynodon dactylon y Eragrostis plana son más fitotóxicas que una nativa coexistente?].
Año de publicación: | 2020
Fuente/Imprenta: | Ecología Austral, Agosto 2020, v. 30, p. 295-303.
Idioma: | Inglés
Notas: | History article: Recibido: 12 de Diciembre de 2019//Aceptado: 27 de Abril de 2020.
Contenido: | ABSTRACT. Allelopathy, the release of phytotoxins by plants, may be a key mechanism by which an invasive species displaces residents. However, methodological procedures are still questioned in the literature. We evaluated the phytotoxic effects of Cynodon dactylon and Eragrostis plana, the most invasive grasses of the Río de la Plata grasslands. Although allelopathy has been claimed as one of the possible mechanisms involved in the establishment and impact of these species, no empirical evidence has convincingly supported it. We performed a germination experiment to assess the effect of both invasive species on Eragrostis bahiensis, a native grass from the region. We used aqueous extracts from fresh and dry leaves of three donor species: two invasive (C. dactylon and E. plana) and one co-occurring native from the introduced range (Coelorachis selloana). This approach allows to relativize the invasive species effect from resident species, according to the novel weapon hypothesis. As a result, only aqueous extracts from dried leaves inhibited the germination and early growth of E. bahiensis. The magnitude of these effects varied between donor species, but there was no consensus to conclude both invasive species had greater effects. Cynodon dactylon caused the strongest inhibitory effect on E. bahiensis. However, the native C. selloana also presented a potent inhibitory effect, stronger than the well-known invasive E. plana. Thus, the role of allelopathy on E. plana invasion in the Río de la Plata grasslands should be questioned. Finally, we addressed some suggestions for improving experimental design for testing the novelty of phytotoxic effects in the introduced range.
Palabras-Clave: | BERMUDAGRASS; CAPIM ANNONI; FITOTOXINAS; GRAMILLA; INVASION; LOVEGRASS; PASTIZALES DEL RIO DE LA PLATA; PHYTOTOXINS; RIO DE LA PLATA GRASSLANDS.
Categoría del tema: | H60 Malezas y escardas
URL: | http://www.ainfo.inia.uy/digital/bitstream/item/14556/1/Guido-2020.pdf
Registro original: | INIA Treinta y Tres (TT)
Ejemplares: | TT - (103119-1) - PXI - AP - DD - Ecología-Austral/2020/Guido -  -  - DIS