Different patterns of aerenchyma formation in two hygrophytic species of Paspalum (Poaceae) as response to flooding

Fabbri, Liliana Teresa; Rua, Gabriel Hugo; Bartoloni, Norberto

doi:10.1016/j.flora.2004.11.002

Cited by 13 publications

(18 citation statements)

References 24 publications

(43 reference statements)

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“…This new feature sets the limit of plants with aerenchyma to the mean inundated area and increases maximum aerenchyma area in plants when mean inundated fraction increases, which agrees with other studies that show the increase of aerenchyma in wetland plants in response to flooding (Fabbri et al, 2005;Kolb and Joly, 2009). However, this model feature may underestimate aerenchyma area in unflooded plants as formation of aerenchyma in some plants is not controlled by flooding conditions (Fabbri et al, 2005).…”

Section: Existence Of Aerenchyma In Mostly Inundated Wetlandssupporting

confidence: 88%

“…However, this model feature may underestimate aerenchyma area in unflooded plants as formation of aerenchyma in some plants is not controlled by flooding conditions (Fabbri et al, 2005). This relationship only applies to natural wetlands since rice paddies are assumed to always be inundated in this study.…”

Section: Existence Of Aerenchyma In Mostly Inundated Wetlandsmentioning

confidence: 99%

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Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

et al. 2012

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Abstract. Methane emissions from natural wetlands and rice paddies constitute a large proportion of atmospheric methane, but the magnitude and year-to-year variation of these methane sources are still unpredictable. Here we describe and evaluate the integration of a methane biogeochemical model (CLM4Me; Riley et al., 2011) into the Community Land Model 4.0 (CLM4CN) in order to better explain spatial and temporal variations in methane emissions. We test new functions for soil pH and redox potential that impact microbial methane production in soils. We also constrain aerenchyma in plants in always-inundated areas in order to better represent wetland vegetation. Satellite inundated fraction is explicitly prescribed in the model, because there are large differences between simulated fractional inundation and satellite observations, and thus we do not use CLM4-simulated hydrology to predict inundated areas. A rice paddy module is also incorporated into the model, where the fraction of land used for rice production is explicitly prescribed. The model is evaluated at the site level with vegetation cover and water table prescribed from measurements. Explicit site level evaluations of simulated methane emissions are quite different than evaluating the grid-cell averaged emissions against available measurements. Using a baseline set of parameter values, our model-estimated average global wetland emissions for the period 1993-2004 were 256 Tg CH 4 yr −1 (including the soil sink) and rice paddy emissions in the year 2000 were 42 Tg CH 4 yr −1 . Tropical wetlands contributed 201 Tg CH 4 yr −1 , or 78 % of the global wetland flux. Northern latitude (>50 N) systems contributed 12 Tg CH 4 yr −1 . However, sensitivity studies show a large range (150-346 Tg CH 4 yr −1 ) in predicted global methane emissions (excluding emissions from rice paddies). The large range is sensitive to (1) the amount of methane transported through aerenchyma, (2) soil pH (±100 Tg CH 4 yr −1 ), and (3) redox inhibition (±45 Tg CH 4 yr −1 ). Results are sensitive to biases in the CLMCN and to errors in the satellite inundation fraction. In particular, the high latitude methane emission estimate may be biased low due to both underestimates in the high-latitude inundated area captured by satellites and unrealistically low high-latitude productivity and soil carbon predicted by CLM4.

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Section: Existence Of Aerenchyma In Mostly Inundated Wetlandssupporting

confidence: 88%

Section: Existence Of Aerenchyma In Mostly Inundated Wetlandsmentioning

confidence: 99%

Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

et al. 2012

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“…These tissues also have a role in floatation (Sifton, 1945), buoying the petiole and allowing the leaves to remain above the surface of the water during periods of flooding. Fabbri et al (2005) observed a significant increase in the size of the lacunas in the aerenchyma in populations of Paspalum exposed to flooding, presumably favouring their competitive position in these aquatic environments. A second function of the petiole aerenchyma in these species is related to the physical structure of the plants.…”

Section: Discussionmentioning

confidence: 89%

Systematic consideration of petiole anatomy of species of Echinodorus Richard (Alismataceae) from north-eastern Brazil

Matias

Soares

Scatena

2007

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…The exoderme of Oxycaryum cubense is multiseriate and the first layer possesses thickening in 'O' and the other three layers are, progressively, less thickened ( Figure 5B), while the exodermis of Eichhornia azurea is slightly thickened ( Figure 4C). Fabbri et al (2005) observed exodermis thichening in Paspalum modestum and Paspalum wrightii, and Seago-Jr. et al (2000b), in Caltha palustris and Nymphaea odorata. Coan et al (2002) registered exodermis slightly with cells thickened in six aquatic species of Eriocaulaceae.…”

Section: Resultsmentioning

confidence: 93%

“…Borkhsenious (2000), for the same species and still in Thalia geniculata and Pontederia cordata. In the study of Fabbri et al (2005), the aerenchyma in the roots resulted in the death and subsequent cellular collapse. Schussler and Longstreth (2000) related the lyse of the cortical cells with a type of programmed cellular death, call of PCD -programmed cellular death, however, they did not observe cellular death in Sagittaria lancifolia.…”

Section: Resultsmentioning

confidence: 99%

Anatomy of the root of eight species of emergent aquatic macrophytes from the upper Paraná river, Paraná State, Brazil floodplain

Marques

Moscheta

2010

Acta Sci. Biol. Sci.

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ABSTRACT. The upper Paraná River floodplain is characterized by the existence of several aquatic and transitional habitats between the aquatic and terrestrial environment, influencing the presence and distribution of aquatic macrophytes. Samples were taken from different places and permanent slides were prepared for analysis and capture of images with the objective of comparing the anatomy of the roots of eight species of emergent aquatic macrophytes. The species feature uniseriate epidermis with narrow and long cells, cortex composed of uniseriate or biseriate exodermis, with or without thickening, aerenchyma with great gaps, uniseriate endodermis, with or without thickening, continuous or interrupted pericycle, and central cylinder with variable number of xylem poles.Key words: aerenchyma, root, Alismataceae, Cyperaceae, Polygonaceae, Pontederiaceae. RESUMO. Anatomia da raiz de oito espécies de macrófitas aquáticas emergentes da planície alagável do alto rio Paraná, Estado do Paraná, Brasil.A planície alagável do alto rio Paraná é caracterizada pela existência de vários hábitats aquáticos e transicionais entre o ambiente aquático e terrestre, influenciando na presença e distribuição das macrófitas aquáticas. Com o objetivo de se comparar a anatomia das raízes de oito espécies de macrófitas aquáticas emergentes, foram realizadas coletas em diferentes locais e preparadas lâminas permanentes para análise e captura de imagens. As espécies possuem epiderme unisseriada com células estreitas e longas, córtex composto por exoderme unisseriada ou bisseriada, com ou sem espessamento, aerênquima com grandes lacunas, endoderme unisseriada, com ou sem espessamento, periciclo periciclo ou interrompido e cilindro central com número variável de polos de xilema.

show abstract

Different patterns of aerenchyma formation in two hygrophytic species of Paspalum (Poaceae) as response to flooding

Cited by 13 publications

References 24 publications

Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

Sensitivity of wetland methane emissions to model assumptions: application and model testing against site observations

Systematic consideration of petiole anatomy of species of Echinodorus Richard (Alismataceae) from north-eastern Brazil

Anatomy of the root of eight species of emergent aquatic macrophytes from the upper Paraná river, Paraná State, Brazil floodplain

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