Ultrastructural and functional chloroplast changes promoting photoacclimation after forest management in a tropical secondary forest

Teixeira, Milena Carvalho; Trindade, Fernanda Gomes; Cunha, Maura Da; Rezende, Carlos Eduardo de; Vitória, Ângela Pierre

doi:10.1016/j.foreco.2018.06.032

Cited by 10 publications

(5 citation statements)

References 41 publications

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“…2016 ) and savannas ( Sankaran 2019 ). At the leaf level, water restriction and high irradiance reduce isotopic discrimination and increase the amount of 13 C incorporated in the plant’s leaf tissue as stomata remain closed longer ( Martinelli et al 1998 ; Teixeira et al . 2018 ).…”

Section: Introductionmentioning

confidence: 99%

“…Blue arrows depict positive relationships and red arrows negative ones. This theoretical model was constructed mostly based on references provides in the main text, particularly by Hacke et al (2001) , Richardson et al (2007) , Jansen et al (2009) , Zanne et al (2010) ; Lens et al (2011) , Ziemińska et al (2013) , Hacke (2015) , de Boer et al (2016) , Rosado et al (2016) , Carlquist (2018) , Dória et al (2018) , Teixeira et al (2018) , Bueno et al (2019) .…”

Section: Introductionmentioning

confidence: 99%

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Anatomical traits related to leaf and branch hydraulic functioning on Amazonian savanna plants

et al. 2023

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Background and Aims Amazonian savannas are isolated patches of open habitats found within the extensive matrix of Amazonian tropical forests. There remains limited evidence on how Amazonian plants from savannas differ in the traits related to drought resistance and water loss control. Previous studies have reported several xeromorphic characteristics of Amazonian Savanna plants at the leaf and branch levels that are linked to soil, solar radiation, rainfall, and seasonality. How anatomical features relate to plant hydraulic functioning in this ecosystem is less known and instrumental if we want to accurately model transitions in trait states between alternative vegetation in Amazonia. In this context, we combined studies of anatomical and hydraulic traits to understand the structure-function relationships of leaf and wood xylem in plants of Amazonian savannas. Methods We measured 22 leaf, wood, and hydraulic traits, including embolism resistance (as P50), Hydraulic Safety Margin (HSM) and isotope-based water use efficiency (WUE), for the seven woody species that account for 75% of the biomass of a typical Amazonian savanna on rocky outcrops in the state of Mato Grosso, Brazil. Key Results Few anatomical traits are related to hydraulic traits. Our findings showed wide variation exists among the seven species studied here in resistance to embolism, water use efficiency and structural anatomy, suggesting no unique dominant functional plant strategy to occupy an Amazonian savanna. We found wide variation in resistance to embolism (-1.6 ±0.1 MPa and -5.0±0.5 MPa) with species that are less efficient in water use (e.g. Kielmeyera rubriflora, Macairea radula, Simarouba versicolor, Parkia cachimboensis, and Maprounea guianensis) showing higher stomatal conductance potential, supporting xylem functioning with leaf succulence and/or safer wood anatomical structures and that species that are more efficient in water use (e.g. Norantea guianensis and Alchornea discolor) can exhibit riskier hydraulic strategies. Conclusions Our results provide a deeper understanding of how branch and leaf structural traits combine to allow for different hydraulic strategies among coexisting plants. In Amazonian savannas, this may mean investing in buffering water loss (e.g. succulence) at leaf level or safer structures (e.g. thicker pit membranes) and architectures (e.g. vessel grouping) in their branch xylem.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anatomical traits related to leaf and branch hydraulic functioning on Amazonian savanna plants

et al. 2023

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“…In the União Biological Reserve (Rebio União), a fragment of the Atlantic forest with integral nature protection located in southwest Brazil presents specific forestry management which consists on the removal of eucalyptus trees (Corymbia citriodora) until 2015 aiming to restore the native flora. With management, the irradiance patterns, humidity, and site temperature were altered, as well as the δ 13 C from the main regenerating species from the understory (Teixeira et al, 2015(Teixeira et al, , 2018Vitória et al, 2016). Other ecological processes might as well have been affected by management, like the C and N dynamics in the soil-plant system.…”

Section: Introductionmentioning

confidence: 99%

Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach

Teixeira

Vitória

Rezende

et al. 2020

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The impact of exotic species on heterogeneous native tropical forest requires the understanding on which temporal and spatial scales these processes take place. Functional tracers such as carbon (δ13C) and nitrogen (δ15N) isotopic composition in the soil-plant system might help track the alterations induced by the exotic species. Thus, we assess the effects from the removal of the exotic species eucalyptus (Corymbia cytriodora) in an Atlantic forest Reserve, and eucalyptus removal on the alteration of the nutrient dynamics (carbon and nitrogen). The hypotheses were: (1) the eucalyptus permanence time altered δ13C and δ15N in leaves, soils and litter fractions (leaves, wood, flowers + fruits, and rest); and (2) eucalyptus removal furthered decomposition process of the soil organic matter. Hence, we determined the soil granulometry, the δ13C and δ15N in leaves, in the superficial soil layer, and litter in three sites: a secondary forest in the Atlantic forest, and other two sites where eucalyptus had been removed in different times: 12 and 3 months ago (M12 and M3, respectively). Litter samples presented intermediate δ13C and δ15N values in comparison with leaves and soil. In the M3, the greater δ13C values in both litter rest fraction and soil indicate the presence, cycling and soil incorporation of C, coming from the C4 photosynthesis of grassy species (Poaceae). In the secondary forest, the soil δ15N values were twice higher, compared with the eucalyptus removal sites, revealing the negative influence from these exotic species upon the ecosystem N dynamics. In the M12, the leaves presented higher δ13C mean value and lower δ15N values, compared with those from the other sites. The difference of δ13C values in the litter fractions regarding the soil led to a greater fractioning of 13C in all sites, except the flower + fruit fractions in the secondary forest, and the rest fraction in the M3 site. We conclude that the permanence of this exotic species and the eucalyptus removal have altered the C and N isotopic and elemental compositions in the soil-plant system. Our results suggest there was organic matter decomposition in all litter fractions and in all sites. However, a greater organic matter decomposition process was observed in the M3 soil, possibly because of a more intense recent input of vegetal material, as well as the presence of grassy, easily-decomposing herbaceous species, only in this site. Therefore, the dual-isotope approach generated a more integrated picture of the impact on the ecosystem after removing eucalyptus in this secondary Atlantic forest, and could be regarded as an option for future eucalyptus removal studies.

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“…In the leaves, the stomas control CO 2 entry into the substomatal cavity, which has a direct impact on δ 13 C present in vegetal tissues. At first, any factor that alters the atmospheric CO 2 isotopic ratio and/or the c i /c a (internal C/atmospheric C) relationship, will then modify δ 13 C (Farquhar et al, 1982;Mardegan et al, 2009;Vitória et al, 2016;Teixeira et al, 2018;Vitória et al, 2018). Hence, in the leaves, the δ 13 C is determined by processes which interfere and modulate photosynthesis, for example the photosynthetic syndrome, the environmental conditions (for instance irradiance, temperature, humidity), and the availability of water and nutrients (Farquhar et al, 1989;Teixeira et al, 2015;Vitória et al, 2016;Teixeira et al, 2018;Vitória et al, 2018;Vitória et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In the União Biological Reserve (Rebio União), a fragment of the Atlantic forest with integral nature protection located in southwest Brazil presents specific forestry management which consists on the removal of eucalyptus trees (Corymbia citriodora) until 2015 aiming to restore the native flora. With management, the irradiance patterns, humidity, and site temperature were altered, as well as the δ 13 C from the main regenerating species from the understory (Teixeira et al, 2015;Vitoria etal., 2016;Teixeira et al, 2018). Other ecological processes might as well have been affected by management, like the C and N dynamics in the soil-plant system.…”

Section: Introductionmentioning

confidence: 99%

Peer Review #1 of "Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach (v0.1)"

2020

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The impact of exotic species on heterogeneous native tropical forests requires the understanding of which temporal and spatial scales these processes take place. Functional tracers such as carbon (δ 13 C) and nitrogen (δ 15 N) isotopic composition in the soil-plant system might help track the alterations induced by the exotic species. Thus, we assess the effects of the removal of the exotic species eucalyptus (Corymbia cytriodora) in an Atlantic forest Reserve and eucalyptus removal on the alteration of the nutrient dynamics (carbon and nitrogen). The hypotheses were: (1) the eucalyptus permanence time altered δ 13 C and δ 15 N in leaves, soils and litter fractions (leaves, wood, flowers+fruits, and rest); and (2) eucalyptus removal furthered decomposition process of the soil organic matter. Hence, we determined the soil granulometry, the δ 13 C and δ 15 N in leaves, in the superficial soil layer, and litter in three sites: a secondary forest in the Atlantic forest, and other two sites where eucalyptus had been removed in different times: 12 and 3 months ago (M12 and M3, respectively). Litter samples presented intermediate δ 13 C and δ 15 N values in comparison with leaves and soil. In the M3 site, the higher δ 13 C values in both litter rest fraction and soil indicate the presence, and carbon soil incorporation coming from the C 4 photosynthesis of grassy species (Poaceae). In the secondary forest, the soil δ 15 N values were twice higher, compared with the eucalyptus removal sites, revealing the negative influence from these exotic species upon the ecosystem N dynamics. In the M12 site, the leaves presented higher δ 13 C mean value and lower δ 15 N values, compared with those from the other sites.

show abstract

Ultrastructural and functional chloroplast changes promoting photoacclimation after forest management in a tropical secondary forest

Cited by 10 publications

References 41 publications

Anatomical traits related to leaf and branch hydraulic functioning on Amazonian savanna plants

Anatomical traits related to leaf and branch hydraulic functioning on Amazonian savanna plants

Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach

Peer Review #1 of "Consequences of removal of exotic species (eucalyptus) on carbon and nitrogen cycles in the soil-plant system in a secondary tropical Atlantic forest in Brazil with a dual-isotope approach (v0.1)"

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