Flooding tolerance of Tabebuia cassinoides: Metabolic, morphological and growth responses

Kolb, Rosana Marta; Joly, Carlos A.

doi:10.1016/j.flora.2008.07.004

Cited by 37 publications

(31 citation statements)

References 20 publications

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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%

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%

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

et al. 2012

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“…Metil orange (0.5 g mL ) was used to monitor pH. Potassium perchlorate was removed by centrifugation (Kolb and Joly, 2009). Ethanol and lactate were determined enzymatically, using test kits (Boehringer, Mannheim, Germany).…”

Section: Metabolites Analysesmentioning

confidence: 99%

“…Ethanol and lactate were determined enzymatically, using test kits (Boehringer, Mannheim, Germany). Pyruvate was determined by enzymatic methods, as described by Kolb and Joly (2009).…”

Section: Metabolites Analysesmentioning

confidence: 99%

Waterlogging-induced changes in fermentative metabolism in roots and nodules of soybean genotypes

Borella

Amarante

Oliveira

et al. 2014

Sci. agric. (Piracicaba, Braz.)

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Waterlogging blocks the oxygen supply to the root system which inhibits respiration, and greatly reduces the energy status of cells that affect important metabolic processes. This study evaluated fermentative metabolism and carbohydrate contents in the root system of two soybean (Glycine max L. Merril) genotypes under hypoxic and post-hypoxic conditions. Nodulated plants (genotypes Fundacep 53 RR and BRS Macota) were grown in vermiculite and transferred to a hydroponic system at the reproductive stage. The root system was submitted to hypoxia by flowing N 2 (nitrogen) gas in a solution for 24 and 72 h. For recovery, plants returned to normoxia condition by transfer to vermiculite for 24 and 72 h. Fermentative enzyme activity, levels of anaerobic metabolites and carbohydrate content were all quantified in roots and nodules. The activity of alcohol dehydrogenase, pyruvate decarboxylase and lactate dehydrogenase enzymes, as well as the content of ethanol and lactate, increased with hypoxia in roots and nodules, and subsequently returned to pre-hypoxic levels in the recovery phase in both genotypes. Pyruvate content increased in nodules and decreased in roots. Sugar and sucrose levels increased in roots and decreased in nodules under hypoxia in both genotypes. Fundacep RR 53 was more responsive to the metabolic effects caused by hypoxia and post-hypoxia than BRS Macota, and it is likely that these characteristics contribute positively to improving adaptation to oxygen deficiency.Keywords: Glycine max, oxygen deficiency, enzyme activities, anaerobic metabolites, sugars IntroductionSoil waterlogging is a common abiotic stress worldwide in cultivated areas and influences the composition and productivity of soybean (Glycine max L. Merril) and most crops species (Jackson and Colmer, 2005;Githiri et al., 2006;Sairam et al., 2009;Kokubun, 2013). In waterlogged soils, gas exchanges between root systems and soil porous spaces are limited due to oxygen diffusion resistance that is around 10,000 times higher in water than in the air (Armstrong et al., 1994;Dongen et al., 2003;Zabalza et al., 2009;Bailey-Serres et al., 2012).Decrease in the oxygen level is the main factor that causes stress, leading to a chain signaling that unleashes a series of metabolic changes (Horchani et al., 2009), such as N metabolism and interconversion of amino acids (Puiatti and Sodek, 1999;Oliveira et al., 2013), changes in carbohydrates levels and energetic metabolism (Sousa and Sodek, 2002a), in an effort to secure plant survival and growth when exposed to hypoxic stress (Geigenberger, 2003). Anaerobic metabolism is activated under low oxygen concentration and as a consequence, there is a significant decrease in energy production that is derived mainly from glycolysis in contrast to oxidative phosphorylation (Kumutha et al., 2008;Horchani et al., 2009;Sairam et al., 2009;Zabalza et al., 2009). Plant survival under these conditions depends almost exclusively on anaerobic metabolism (Sousa and Sodek, 2002a).Due to the lack of O 2 as the fi...

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“…However, when subjected to extended periods of flooding and the water column is relatively shallow, it may be more beneficial to the plant to undergo rapid shoot elongation to escape submersion. Some species rapidly elongate their stems or petioles keeping leaves above the water surface, facilitating gas exchange and light interception (Voesenek et al 2004;Kolb & Joly 2009;Manzur et al 2009;Chen et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Anatomical and morphological modifications in response to flooding by six Cerrado tree species

et al. 2015

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Wetlands are common in the Cerrado (Brazilian savannas) biome, however flooding of these wetlands impairs growth and development of most plants. We evaluated flood tolerance of typical Cerrado trees. Seedlings of Aspidosperma macrocarpon (Apocynaceae), Tabebuia rosea (Bignoniaceae), Handroanthus chrysotrichus (Bignoniaceae), Myracrodruon urundeuva (Anacardiaceae), Kielmeyera coriacea (Calophyllaceae) and Copaifera langsdorffii (Fabaceae) were flooded up to the stem base for 30 days. Stems with cortical cracks, secondary aerenchyma and hypertrophic lenticels were observed in flooded plants of M. urundeuva, H. chrysotrichus and T. rosea while adventitious roots were formed in flooded plants of T. rosea and H. chrysotrichus. However, only T. rosea developed aerenchyma in the root cortex. K. coriacea and A. macrocarpon were the most sensitive to flooding, showing a decrease in survival and necrosis of the leaves and roots. C. langsdorffii and M. urundeuva were less sensitive to flooding, although reductions in root biomass and symptoms of necrosis of the roots were noticeable in flooded seedlings. Flooded M. urundeuva seedlings also had a decrease in total leaf area, leaf biomass, total biomass and in stem growth. Flooding affected root development and reduced stem growth of H. chrysotrichus with symptoms of necrosis of the leaves and roots. T. rosea was the only species where symptoms of injury from flooding were not evident.

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Flooding tolerance of Tabebuia cassinoides: Metabolic, morphological and growth responses

Cited by 37 publications

References 20 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

Waterlogging-induced changes in fermentative metabolism in roots and nodules of soybean genotypes

Anatomical and morphological modifications in response to flooding by six Cerrado tree species

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