The physiological light response of two tree species across a hydrologic gradient in Brazilian savanna (Cerrado)

Dalmagro, Higo J.; Lobo, Francisco de Almeida; Vourlitis, George L.; Dalmolin, Ândrea Carla; Antunes, M. Z.; Ortiz, Carmen Eugênia Rodríguez; Nogueira, José de Souza

doi:10.1007/s11099-014-0001-5

Cited by 24 publications

(18 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…C. americana is tolerant to droughts in the Cerrado and floodings in the Pantanal, surviving in habitats with widely contrasting hydrology (Dalmagro et al 2014). However, this species' CO 2 assimilation and photosynthetic capacity Stages ontogenetic stages, k annual population growth rate, CI confidence interval for k, S l seedlings, Y r young ramets, I r immature ramets, Y s young seedlings, I s immature seedlings, A adult An asterisk (*) indicates the rates that most influenced k Trees decrease with flooding (Dalmagro et al 2013).…”

Section: Discussionmentioning

confidence: 99%

“…C. americana has a wide geographic distribution, from Central to South America. Although this species may grow on different soil types, it is often found on acidic and infertile soils (Baruch 2011) or poorly drained soils (e.g., wetlands) (Dalmagro et al 2014). The physical factors that determine variations in C. americana phenology and physiology across rainfall and fertility gradients have been identified.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of resource availability on sprouting: a key trait influencing the population dynamics of a tree species

Lucena

Amorim

Lobo

et al. 2015

Trees

View full text Add to dashboard Cite

Key message Sprouting is a key component of the population dynamics of woody species. Regeneration via sprouting contributes substantially to population growth when resource availability varies. Abstract Basal sprouting is an important trait that facilitates the persistence of woody species under different environmental conditions. Environmental heterogeneity can have variable effects on allocation to sexual reproduction and vegetative growth over an individual's ontogeny; consequently, environmental heterogeneity can influence the dynamics of woody plant populations. However, the effects of environmental factors on the ramet and genet dynamics of woody species have yet to be fully explored. This study investigated the population dynamics of Curatella americana L. (Dilleniaceae), an abundant tree species with a wide geographic distribution. The following hypotheses were tested: (1) density, vital rates and population growth rate are constrained by low rainfall and low soil fertility and (2) ramet production contributes more than seedling production to population growth at low rainfall levels and low soil fertility. Population dynamics were evaluated at two soil types (low and high fertility) over 3 years (2010, 2011 and 2012) with varying rainfall levels (average, average and low rainfall levels, respectively). Both hypotheses were supported. Vegetative growth and the population growth rate were limited by low rainfall and low soil fertility. The survival rates of adults and immature ramets had the largest effect on population growth. Although sprouting was limited by resource availability, this regeneration mode contributed more than seedlings to population growth. Basal sprouting not only ensures species persistence but also, as indicated by these results, permits a species to tolerate a lack of seedling recruitment. Basal sprouting was, therefore, determined to play an important role in the population growth of woody species in heterogeneous environments.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effects of resource availability on sprouting: a key trait influencing the population dynamics of a tree species

Lucena

Amorim

Lobo

et al. 2015

Trees

View full text Add to dashboard Cite

show abstract

“…As settlers of the wetlands of the Brazilian Pantanal, this species is considered an invasive plant that is widely tolerant to seasonal variations in hydrological conditions and is therefore resistant to the dry season as well as to the seasonal floods that occur during the rainy season in the Pantanal [6]. The plant is used in folk medicine to treat respiratory infections, digestive disorders, and asthma.…”

Section: Introductionmentioning

confidence: 99%

Genotoxic and Chemopreventive Effects of Vochysia divergens Leaves (Pantanal, Brazil)

Oliveira

Mendes

Acésio

et al. 2018

Evidence-Based Complementary and Alternative Medicine

View full text Add to dashboard Cite

The medicinal plant Vochysia divergens is a colonizing tree species of the Pantanal, a unique and little explored wetland region in Brazil. This species is used in folk medicine as syrups and teas to treat respiratory infections, digestive disorders, asthma, scarring, and skin diseases. The objectives of this study were to evaluate the antioxidant, cytotoxic, and genotoxic potential of the ethanolic extract of Vochysia divergens leaves (VdE), as well as the influence of VdE and its major component (the flavone 3′,5-dimethoxy luteolin-7-O-β-glucopyranoside; 3′5 DL) on MMS-induced genotoxicity. The extract significantly reduced the viability of V79 cells in the colorimetric XTT assay at concentrations ≥ 39 μg/mL. A significant increase in micronucleus frequencies was observed in V79 cell cultures treated with VdE concentrations of 160 and 320 μg/mL. However, animals treated with the tested doses of VdE (500, 1000, and 2000 mg/kg b.w.) exhibited frequencies that did not differ significantly from those of the negative control group, indicating the absence of genotoxicity. The results also showed that VdE was effective in reducing MMS-induced genotoxicity at concentrations of 20, 40, and 80 μg/mL in the in vitro test system and at a dose of 15 mg/kg b.w. in the in vivo test system. Its major component 3′5 DL exerted no protective effect, suggesting that it is not responsible for the effect of the extract. The results of the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay showed that VdE was able to scavenge 92.6% of free radicals. In conclusion, the results suggest that the protective effect of VdE may be related, at least in part, to the antioxidant activity of its chemical constituents.

show abstract

“…In the northern Pantanal of Mato Grosso, Brazil, species must physiologically adapt to seasonal stresses when soils are either completely dry or fully saturated (Dalmagro et al. , ). Flooding occurs in phase with the wet season when rivers overbank and inundate the surrounding floodplains.…”

Section: Introductionmentioning

confidence: 99%

Physiological responses to extreme hydrological events in the Pantanal wetland: heterogeneity of a plant community containing super‐dominant species

Dalmagro

Lathuillière

Vourlitis

et al. 2016

J Vegetation Science

View full text Add to dashboard Cite

Aims We tested two mechanisms of adaptation to extreme hydrological stresses (flooding and drought) of species making up a tropical wetland plant community by measuring leaf gas exchange and water potential. We hypothesized that anoxic conditions that occur during flooding will decrease leaf gas exchange when compared to the dry season, and that ‘super‐dominant’ species will have a distinctive physiological advantage when compared to other plants within the community. Location Northern Pantanal wetland, Private Natural Heritage Reserve of the Brazilian Social Service of Commerce (RPPN‐SESC Pantanal), Mato Grosso, Brazil. Methods Two periods representing typical extreme hydrological conditions in the Pantanal wetland were selected based on historical soil and meteorological measurements: (1) a drought period when plants experience stress due to soil moisture deficits during a dry season that persists for several months (May to Sept), and (2) a flooding period when oxidation‐reduction potential is negative for 30 d or more (Mar or Apr), indicating anoxic stress. Measurements of gas exchange and leaf water potential were made on seven species in drought and flood stress conditions. The seven species represent the majority of the plant community. Results As a whole, the plant community showed significantly lower potential net photosynthesis (PN) during flooding when soil oxidation‐reduction potential reached close to −900 mV when compared to the dry season, but the magnitude of the decline in PN was species specific. Not all super‐dominant species showed higher PN compared to non‐dominant species, but they did demonstrate higher stomatal conductance and transpiration leading to lower water use efficiency. The combination of higher PN despite low soil water content suggests that the plant community had access to deep water resources. This access was also confirmed by the midday leaf water potential, which was similar for the flood and dry seasons. Conclusions Results suggest that the plant community may have high physiological performance under a wide range of soil oxidation‐reduction potentials. Higher PN rates of super‐dominant species indicate a physiological advantage of these species in the different hydrological conditions.

show abstract

The physiological light response of two tree species across a hydrologic gradient in Brazilian savanna (Cerrado)

Cited by 24 publications

References 54 publications

The effects of resource availability on sprouting: a key trait influencing the population dynamics of a tree species

The effects of resource availability on sprouting: a key trait influencing the population dynamics of a tree species

Genotoxic and Chemopreventive Effects of Vochysia divergens Leaves (Pantanal, Brazil)

Physiological responses to extreme hydrological events in the Pantanal wetland: heterogeneity of a plant community containing super‐dominant species

Contact Info

Product

Resources

About