info:eu-repo/semantics/article
Different patterns of aerenchyma formation in two hygrophytic species of Paspalum (Poaceae) as response to flooding
Registro en:
Fabbri, Liliana Teresa; Rua, Gabriel Hugo; Bartoloni, Norberto Jose; Different patterns of aerenchyma formation in two hygrophytic species of Paspalum (Poaceae) as response to flooding; Elsevier Gmbh; Flora; 200; 4; 1-8-2005; 354-360
0367-2530
CONICET Digital
CONICET
Autor
Fabbri, Liliana Teresa
Rua, Gabriel Hugo
Bartoloni, Norberto Jose
Resumen
Paspalum modestum and P. wrightii are perennial grasses growing in permanent and seasonally flooded areas, respectively. The former produces short rhizomes and floating culms, the latter forms long rhizomes and erect culms. Variations in percentage aerenchymatous space (PAS) in different organs as a response to flooding was analysed using a clone of each species. Eighteen plantlets of each clone were cultivated during 7 months under flooded vs. unflooded conditions. After this period, roots, rhizomes, culms, and leaf sheaths were collected and prepared. PAS was measured using an image analysis device, and data were analysed using ANOVA. Production of aerenchyma took place in both species within the cortical parenchyma of roots, rhizomes and culms, and the mesophyll of leaf sheaths, both in flooded and unflooded plants. Under flooding conditions PAS increased in both species, although the individual response of organs differed: whereas in P. modestum PAS increased primarily in substratum-fixed roots, in P. wrightii all organs produced additional aerenchyma uniformly. Contrasting responses are understood as adaptations to permanent and seasonal flooding, respectively. Fil: Fabbri, Liliana Teresa. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Cátedra de Botánica Agrícola; Argentina Fil: Rua, Gabriel Hugo. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Recursos Naturales y Ambiente. Cátedra de Botánica Agrícola; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Bartoloni, Norberto Jose. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Métodos Cuantitativos y Sistemas de Información; Argentina