Ecophysiological responses of water hyacinth exposed to Cr3+ and Cr6+

Paiva, Luisa Brito; Oliveira, Jurandi Gonçalves de; Azevedo, Ricardo Antunes; Ribeiro, Douglas Rodrigues; Silva, Marcelo Gomes da; Vitória, Ângela Pierre

doi:10.1016/j.envexpbot.2008.11.012

Cited by 110 publications

(79 citation statements)

References 28 publications

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“…Reductions in the F v /F m ratio are reported as photoinhibition in tropical tree species subjected to elevated levels of irradiance (Dias and Marenco, 2007) and plants exposed to stress (Paiva et al, 2009;Gonçalves et al, 2010). One of the targets of the photoinhibitory process is the dimer D1/D2, a chief structural protein complex of PSII.…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Lage-Pinto

Bernini

Oliveira

et al. 2012

Braz. J. Plant Physiol.

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Gas exchange, chlorophyll a fluorescence, and photosynthetic pigments of Xylopia sericea A. St.-Hil. and Siparuna guianensis Aubl. were evaluated during the rainy season and the dry season (2009)(2010) in three understories with different ecological conditions (irradiance, water availability, and temperature) located in the União Biological Reserve (known as REBIO União), at Rio de Janeiro State, a natural forest understory, eucalyptus understory under regeneration, and understory of eucalyptus plantation with 18-year-old trees that were removed 1 year before. The lowest values of F v /F m e F m /F o were observed in the exposed understory for both seasons, with lower values in the dry season, suggesting that reduced water availability potentializes the photoinhibitory process. For both species of the exposed understory it is suggested the occurrence of photoprotection, given that an increased proportion of carotenoid pigments in relation to the chlorophylls were verified. Both species still exhibited dynamic photoinhibition after 1 year of exposure to full sunlight (exposed understory) in both seasons, but more markedly so in the dry season, though they belong to early stages of ecological succession. Based on the results, it is suggested that these species are indicated for planting in degraded areas and that the cutting of eucalyptus trees as management practice should be performed in a gradual manner, during the rainy season, in order to minimize stress on these species.

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Section: Discussionmentioning

confidence: 99%

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Lage-Pinto

Bernini

Oliveira

et al. 2012

Braz. J. Plant Physiol.

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“…Statistical analysis indicated the Fv/F0 ratio as the more effective in discriminating the efficiency of the photosynthetic apparatus. Others authors have suggested the use of the Fv/F0 ratio, rather than the Fv/Fm ratio, for better discrimination of small differences in the PS II quantum yield (Paiva et al, 2009;Pereira et al, 2000;Sarajeva et al, 2007;Oliveira et al, 2009;Vitória et al, 2010). In contrast, Roháček (2002) reported that the Fv/ F0 ratio in healthy plants can vary between 4 and 6, suggesting that despite it decreases in sun plants during the rainy season, this could not be well correlated with a stressed condition, as the performance of PS II quantum yield proved to be .…”

Section: Discussionmentioning

confidence: 99%

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Silva

Oliveira

Cunha

et al. 2010

Braz. J. Plant Physiol.

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The photosynthetic dynamics of the tropical pioneer species, Byrsonima sericea DC., were studied during the regeneration process of a native forest by evaluating ecophysiological (gas exchange, chlorophyll a fluorescence and photosynthetic pigment contents) and anatomical parameters of plants in sunny and shady environments. Ecophysiological evaluations were carried out monthly for one year, encompassing both a dry and a rainy season. Byrsonima sericea DC. presents anatomical plasticity that enables it to establish in environments with contrasting light regimes. In sunny conditions, it produced a thicker leaf (about 420 mm) and flat adaxial epidermis, whilst in the shade, leaves had a thinner convex adaxial epidermis (about 395 mm). No differences were found in the compositions of the pigments in the different environments, however, during the dry season, the plants presented a significantly higher concentration of photosynthetic pigments. In the sun, plants showed decreases in Fv/F0 ratio (in the rainy season) and NPQ (in the dry season), but no difference was observed between plants that were in the sun or in the shade. A significantly higher net photosynthetic rate was found only in the rainy season in the plants in the sun, compared to shaded plants (9.9±0.8 and 7.4±0.3 μmol m -2 s -1 , respectively). Significant increase in transpiration was observed in plants in the shade during the dry season, but no alterations were observed in the water use efficiency. Ecophysiological data suggest that mainly plants overexposed to the sun underwent water limitations during the dry season and that, in the rainy season, these plants increased their net photosynthetic rate, possibly due to the greater drainage force resulting from increased growth during this period. Data suggest that anatomic alterations, namely the convex adaxial epidermis, could aid in the supply of light to shaded plants during both seasons, precluding changes in the pigments, such as the increase in chlorophyll b usually observed in shaded plants, but not detected in the present study. Another consequence of the greater quantity of light captured by these shade plants is that during the dry season their net photosynthetic rate was not different from that of plants in a sunny environment. However, when water was not a limiting factor, a better photosynthetic performance was observed in this pioneer specie in open spaces.Key words: Atlantic forest species; photosynthetic adaptation; leaf anatomy; sun overexposure; shaded plants. RESUMOA dinâmica fotossintética da espécie pioneira tropical Byrsonima sericea DC. foi estudada durante o processo de regeneração de uma mata nativa por avaliações ecofisiológicas (trocas gasosas, fluorescência da clorofila a e conteúdo de pigmentos fotossintéticos) e parâmetros anatômicos das plantas em ambientes ensolarados e sombreados. As avaliações ecofisiológicas foram feitas mensalmente por um ano e os dados foram agrupados em estação seca e chuvosa. Byrsonima sericea DC. apresentou plasticidade anatômica que a ...

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“…Aquatic macrophytes have ability to concentrate heavy metals in their roots, shoots as well as leaves. However, the accumulation of heavy metals is much higher in roots of these plants (Mishra et al 2009;Paiva et al 2009;Mufarrege et al 2010). V.K.…”

Section: Aquatic Macrophytes and Their Potential To Accumulate Heavy mentioning

confidence: 99%

Phytoremediation Potential of Aquatic Macrophyte, Azolla

Sood

Uniyal

Prasanna

et al. 2011

AMBIO

244

123

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Aquatic macrophytes play an important role in the structural and functional aspects of aquatic ecosystems by altering water movement regimes, providing shelter to fish and aquatic invertebrates, serving as a food source, and altering water quality by regulating oxygen balance, nutrient cycles, and accumulating heavy metals. The ability to hyperaccumulate heavy metals makes them interesting research candidates, especially for the treatment of industrial effluents and sewage waste water. The use of aquatic macrophytes, such as Azolla with hyper accumulating ability is known to be an environmentally friendly option to restore polluted aquatic resources. The present review highlights the phytoaccumulation potential of macrophytes with emphasis on utilization of Azolla as a promising candidate for phytoremediation. The impact of uptake of heavy metals on morphology and metabolic processes of Azolla has also been discussed for a better understanding and utilization of this symbiotic association in the field of phytoremediation.

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Ecophysiological responses of water hyacinth exposed to Cr3+ and Cr6+

Cited by 110 publications

References 28 publications

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Photosynthetic analyses of two native Atlantic Forest species in regenerative understory of eucalyptus plantation

Photosynthetic performance and anatomical adaptations in Byrsonima sericea DC. under contrasting light conditions in a remnant of the Atlantic forest

Phytoremediation Potential of Aquatic Macrophyte, Azolla

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