Instantaneously measured traits may detect non-plastic ecophysiological performances in response to drought, explaining distributions of Styrax species in the Cerrado

Veiga, Eduardo Borges da; Habermann, Gustavo

doi:10.1007/s00468-013-0919-4

Cited by 11 publications

(5 citation statements)

References 31 publications

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“…These adjustment strategies of C. langsdorffii found in Cerrado physiognomies corroborate data by Veiga and Habermann (2013), who suggest that species in this ecosystem exhibit photoprotection performance under water stress. Thus, the capacity of making diurnal adjustments in photochemical and non-photochemical processes in order to overcome photoinhibitory threats would play a central role in the understanding of photosynthesis acclimation in seasonal environments like in Cerrado, regardless of the prevailing irradiance levels and degree of stomata closure (Franco and Lüttge, 2002).…”

Section: Discussionsupporting

confidence: 88%

WATER DEFICIT ENSURES THE PHOTOCHEMICAL EFFICIENCY OF Copaifera langsdorffii Desf1

et al. 2017

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The intensity and frequency of drought periods has increased according to climate change predictions. The fast overcome and recovery are important adaptive features for plant species found in regions presenting water shortage periods. Copaifera langsdorffii is a neotropical species that has developed leaves presenting physiological mechanisms and morphological adaptations that allow its survival under seasonal water stress. We aimed in this work to observe substantial physiological responses for water saving and damage representative to the photochemical reaction after exposed plants to water stress and to subsequent recovery. We found in plants mechanisms to control water loss through the lower stomatal conductance, even after rehydration. It goes against the rapid recovery of leaves, indicated by the relative water content values restored to previously unstressed plants. Stomatal conductance was the only variable presenting high plasticity index. In photochemical activity, the species presented higher photochemical quenching, electron transport rate and effective quantum yield of photosystem II when they were subjected to rehydration after water stress period. Our results suggest that C. langsdorffii presented rapid rehydration and higher photochemical efficiency even after water restriction. These data demonstrate that this species can be used as a model for physiological studies due to the adjustment developed in response to different environmental schemes.

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Section: Discussionsupporting

confidence: 88%

WATER DEFICIT ENSURES THE PHOTOCHEMICAL EFFICIENCY OF Copaifera langsdorffii Desf1

et al. 2017

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“…Cerrado conservation has been a major challenge due to lack of scientific information regarding the plant responses to environmental stresses that occur in the different physiognomies of this biome. Studies addressing native species have been carried out in greenhouse and in loco (Veiga and Habermann, 2013;Dalmolin et al, 2015;Garcia et al, 2015). However, little is known about the effects of drought on woody species from Cerrado.…”

Section: Introductionmentioning

confidence: 99%

Physiological and biochemical changes attenuate the effects of drought on the Cerrado species Vatairea macrocarpa (Benth.) Ducke

Vieira

Silva

Moro

et al. 2017

Plant Physiology and Biochemistry

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Drought is considered the main abiotic stress because it influences the distribution of plant species and limits the productivity of ecosystems. The aim of this study was to evaluate the effects of drought on physiological and biochemical parameters during the initial development of Vatairea macrocarpa, a native cerrado species. Plants were subjected to daily watering (control); suppression of watering during 90 days with field capacity (fc) 50% and 25% and then followed by rewatering. Relative leaf water content (RWC), gas exchange, photosynthetic pigments content, carbohydrate and amino acids content, antioxidant activities and growth were recorded. The RWC decreased according to the soil water restriction, causing reduction in stomatal conductance and decrease of 76.4% in net photosynthesis in plants submitted to 25% fc. Water restriction decreased the chlorophyll content, however increased carotenoid content and also improved the antioxidant activities of superoxide dismutase (SOD), ascorbate peroxidase (APX) and catalase (CAT). In addition, high levels of sugars (sucrose, raffinose) and amino acids (proline, tryptophan, valine, glutamine and GABA) were detected in drought stressed plants, contributing to osmoregulation and as sources of carbon and nitrogen after rehydration. Decreases in carbon assimilation promoted a reduction of the leaf area, however an increase in the root surface area was observed. After rewatering, the analized parameters became similar to the control plants indicating that the severe water stress did not impair the survival of young plants. Instead, adjustments were made to protect them against drought such as the maintenance of the assimilatory metabolism at minimal levels.

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“…To estimate the photoprotective role of anthocyanins, we measured chlorophyll a fluorescence and calculated the fraction of absorbed light used in photochemical activity [ P = (Fm′ − Fs)/Fm′], which is equivalent to the effective quantum yield of photosystem II (ΦPSII), the heat dissipation in the light‐gathering pigment antenna, which collects light and transfers the energy to the reaction center complex ( D = 1 – Fv′/Fm′) and the heat dissipation in reaction centers of photosystem II, PSII [ E = (1 – qP)(Fv′/Fm′)] according to da Veiga and Habermann (2013). We used saturating light pulses of 7000 µmol photons·m −2 ·s −1 for 0.7 s. For these equations, Fv′ is the variable fluorescence between the maximal (Fm′) and minimal (Fo′) fluorescence of light‐adapted fruits, and Fs is the steady‐state fluorescence of light‐adapted fruits.…”

Section: Methodsmentioning

confidence: 99%

Bicolored display ofMiconia albicansfruits: Evaluating visual and physiological functions of fruit colors

Camargo

Schaefer

Habermann

et al. 2015

American J of Botany

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Since the communicative function of unripe fruits was not confirmed, seed dispersers are unlikely to select the display with bicolored fruits. Because of the absence of photosynthetic activity in ripe and unripe fruits and enhanced photoprotective mechanisms in ripe fruits rather than in unripe fruits, we could not confirm the photoprotective role of anthocyanins in unripe fruits. As an alternative hypothesis, we suggest that the bicolored fruit display could be an adaptation to diversify seed dispersal vectors instead of restricting dispersal to birds and that anthocyanins in unripe fruits may have a defense role against pathogens.

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Instantaneously measured traits may detect non-plastic ecophysiological performances in response to drought, explaining distributions of Styrax species in the Cerrado

Cited by 11 publications

References 31 publications

WATER DEFICIT ENSURES THE PHOTOCHEMICAL EFFICIENCY OF Copaifera langsdorffii Desf1

WATER DEFICIT ENSURES THE PHOTOCHEMICAL EFFICIENCY OF Copaifera langsdorffii Desf1

Physiological and biochemical changes attenuate the effects of drought on the Cerrado species Vatairea macrocarpa (Benth.) Ducke

Bicolored display ofMiconia albicansfruits: Evaluating visual and physiological functions of fruit colors

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