Comparative gas exchange performance during the wet season of three Brazilian Styrax species under habitat conditions of cerrado vegetation types differing in soil water availability and crown density

Habermann, Gustavo; Ellsworth, Patricia F.V.; Cazoto, Juliana L.; Simão, Edson; Bieras, Angela Cristina

doi:10.1016/j.flora.2010.05.009

Cited by 19 publications

(11 citation statements)

References 24 publications

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“…However, we were able to find differences in the carbon assimilation rates of the species; G. polymorpha showed the highest values in comparison to G. barrosii. The same trend was found in congeneric Styrax species growing on the edge and in the understory of a "cerradão" forest (Habermann et al 2011). Differences in the amount of mesophyll tissues may partially explain these photosynthetic differences, as G. polymorpha heavily invested in mesophyll thickness in comparison to G. barrosii.…”

Section: Traitssupporting

confidence: 63%

“…Despite the fact that both species share similar ecologies, we expected structural and functional divergences in leaf traits due to their different growth forms (Santiago & Wright 2007) and the differences in light intensity and quality that a tree (G. polymorpha) and a shrub (G. barrosii) experience along the borders of a forest (Habermann et al 2011). We expected that the shrub species would present mesomorphic leaves with low investment in tissues thickness, thinner and bigger leaves, with higher values of specific leaf area and mass basis carbon assimilation, a set of traits that would allow the shrub to deal with the lower light availability, and a common condition experienced in the forest understory.…”

Section: Introductionmentioning

confidence: 99%

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Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil

Rossatto

Kolb

2012

Acta Bot. Bras.

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RESUMO(Atributos foliares estruturais e funcionais de duas espécies de Gochnatia, de formas distintas de crescimento, em uma floresta esclerófila do sudeste do Brasil). O gênero Gochnatia é comumente encontrado em diferentes fitofisionomias do Cerrado do Estado de São Paulo, crescendo desde ambientes mais abertos até áreas florestais mais fechadas. Aqui foram comparadas a anatomia foliar e alguns parâmetros ecofisiológicos de duas espécies do gênero Gochnatia, uma arbustiva (Gochnatia barrosii Cabrera) e a outra arbórea (Gochnatia polymorpha (Less.) Cabrera), ambas ocorrendo em área de cerradão na Estação Ecológica de Assis, SP. Encontraram-se diferenças estruturais qualitativas entre as espécies, com G. barrosii apresentando folhas anfiestomáticas, com epiderme unisseriada e G. polymorpha apresentando folhas hipoestomáticas, com epiderme múltipla ou hipoderme, na face adaxial. Além disso, as folhas de G. barrosii apresentaram menores valores para a espessura dos tecidos (com exceção da epiderme na face abaxial) e da folha em relação a G. polymorpha. Foram observadas diferenças na assimilação de CO 2 tanto em base de área quanto de massa seca foliar, além de diferenças na área foliar específica, sendo esta maior em G. barrosii. Apesar das folhas de G. barrosii possuírem estrutura bem menos escleromorfa do que as folhas de G. polymorpha, não foram encontradas diferenças na eficiência do uso de água. Os resultados sugerem que espécies de formas distintas de crescimento de um mesmo gênero possuem características foliares diferenciadas para lidar com as variações ambientais a que são submetidas. Palavras-chave: anatomia foliar, Cerrado, estômatos, trocas gasosas ABSTRACT(Structural and functional leaf traits of two Gochnatia species, with distinct growth forms, from a sclerophyll forest in Southeastern Brazil). Gochnatia is very common in different phytophysiognomies in the Cerrado of São Paulo State, occupying open and closed areas. In this study, we compared the leaf anatomy and some ecophysiological traits of two species of Gochnatia, one a shrub (Gochnatia barrosii Cabrera) and the other a tree (Gochnatia polymorpha (Less.) Cabrera), which both occur in an area of "cerradão" at the Estação Ecológica de Assis, SP. We found qualitative structural differences between the species, with G. barrosii presenting amphistomatic leaves with a uniseriate epidermis and G. polymorpha showing hypostomatic leaves and a multiple epidermis or hypodermis on the adaxial surface. Moreover, the G. barrosii leaves had lower values in tissue thickness (with the exception of the epidermis on the abaxial surface) and leaf thickness in relation to G. polymorpha. There were differences in CO 2 assimilation both in area and leaf dry mass basis, and differences in specific leaf area, which was higher in G. barrosii. Although the G. barrosii leaves were much less sclerophyllous than the G. polymorpha leaves, we found no differences in the efficiency of water use. The results suggest that plants from the same genus, but with distinct growth fo...

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Section: Traitssupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil

Rossatto

Kolb

2012

Acta Bot. Bras.

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“…These elevated rates, coupled with the higher g s result in savanna plants showing elevated WUE. This fact was mainly reported for tree species (Habermann et al 2011; Da Veiga and Habermann 2013), and herbaceous species seems to follow a similar pattern.…”

Section: Discussionmentioning

confidence: 53%

“…This is particularly the case for traits associated with carbon gain, considering morphological (specific leaf area) and physiological aspects (maximum photosynthesis and stomatal conductance) (Pérez-Harguindeguy et al 2013). Many studies reported how these traits enable plant persistence in savanna environments (Lemos Filho 2000;Prado et al 2004;Franco et al 2005;Habermann et al 2011;Souza et al 2015;Rossatto and Franco 2017); which are characterized by a series of selective pressures such as fire, rainfall seasonality, lower content of soil nutrients and elevated irradiance (Franco 2002). Such studies, however, focused only on tree species, a diverse, but not unique, component of the savanna ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Leaf traits combinations may explain the occurrence of savanna herbaceous species along a gradient of tree encroachment

Carlos

Rossatto

2017

Theor. Exp. Plant Physiol.

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In savanna environments, plants have specific leaf traits to deal with high irradiance. These traits allow plants to show high carbon assimilation capacity. However, under encroachment, reduced light availability may act as a filter on traits of plants established under typical savanna conditions. Here we studied morpho-physiological traits of species exclusively found in typical and forested savanna conditions to evaluate how encroachment selects for specific leaf traits in such environments. We also evaluated if species occurring in distinct encroached situations would show plasticity to deal with light variations. We studied two species exclusively found in typical savanna (TS, open condition), two species exclusively found in forested savanna (FS, encroached condition) and two species growing along a gradient of tree encroachment (typical, dense and forested savanna). We measured specific leaf area (SLA), maximum photosynthetic rate in an area basis (A max), stomatal conductance (g s), water use efficiency (WUE), leaf carbon (C) and nitrogen (N) concentrations. We found that herbaceous species exclusively found in TS possess higher A max , g s , WUE and C in comparison with plants from forested savanna. Such strategies are necessary to thrive under environments with elevated irradiances. In turn, species from FS showed elevated SLA and foliar N concentration, strategies linked to capture diffuse light in forested environments. Species capable of thriving in sites with distinct degrees of encroachment changed their leaf traits according with light availability. We conclude that differences in leaf traits between typical and forested savanna species may explain the non-occurrence of typical savanna species when their environment become encroached. Only those species capable of showing a certain degree of plasticity may survive under such distinct encroached states.

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“…Consequently, the main constraint for cerrado woody species during the wet season is a nutritional stress, as soil nutrients are leached to soil beds after heavy rains, while in the dry season the lack of water availability to roots becomes the main concern. In fact, the dry season in such regions creates a remarkable pressure for the survival of cerrado species (Hao et al, 2008;Habermann et al, 2011a;Habermann and Bressan, 2011). Under an ecological point of view, and considering the low-light saturation of citrus photosynthesis and its shallow root system, it can be said that citrus plants present a forestlike ecophysiological behavior.…”

Section: Climate and Genetic Origin Center Of Citrus And Cerrado Woodmentioning

confidence: 99%

Towards a New Ecophysiological Approach to Understand Citrus Crop Yield Under Abiotic Stresses Mirroring in the Brazilian Savanna Genetic Resources

Souza¹,

Habermann²

2012

Water Stress

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Comparative gas exchange performance during the wet season of three Brazilian Styrax species under habitat conditions of cerrado vegetation types differing in soil water availability and crown density

Cited by 19 publications

References 24 publications

Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil

Structural and functional leaf traits of two Gochnatia species from distinct growth forms in a sclerophyll forest site in Southeastern Brazil

Leaf traits combinations may explain the occurrence of savanna herbaceous species along a gradient of tree encroachment

Towards a New Ecophysiological Approach to Understand Citrus Crop Yield Under Abiotic Stresses Mirroring in the Brazilian Savanna Genetic Resources

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