Influence of N deficiency and salinity on metal (Pb, Zn and Cu) accumulation and tolerance by Rhizophora stylosa in relation to root anatomy and permeability

Cheng, Hao; Wang, You‐Shao; Ye, Zhihong; Chen, Dan-Ting; Wang, Yu-Tu; Yang, Peng; Wang, Liying

doi:10.1016/j.envpol.2012.01.034

Cited by 41 publications

(29 citation statements)

References 69 publications

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“…2. Salinity stress induces a higher demand on carbon resources Trees subject to salinity stress tend to thicken the walls of the outer cell layer of the roots and significantly increase the lignification of the exodermis, endodermis and stele, limiting the intake of salt and, as a consequence, of water and nutrients (Munns 2002;Cheng et al 2012). To compensate for such uptake limitation plants allocate more biomass to root growth, increasing their resource absorption surface (Shannon et al 1994;Krishnamorthy et al 2009;Cheng et al 2010Cheng et al , 2012Peters et al 2014).…”

Section: Discussionmentioning

confidence: 97%

“…Salinity stress induces a higher demand on carbon resources Trees subject to salinity stress tend to thicken the walls of the outer cell layer of the roots and significantly increase the lignification of the exodermis, endodermis and stele, limiting the intake of salt and, as a consequence, of water and nutrients (Munns 2002;Cheng et al 2012). To compensate for such uptake limitation plants allocate more biomass to root growth, increasing their resource absorption surface (Shannon et al 1994;Krishnamorthy et al 2009;Cheng et al 2010Cheng et al , 2012Peters et al 2014). Hence, the demand for carbon capture (and consequently of photosynthetic Trees (2014Trees ( ) 28:1413Trees ( -1425Trees ( 1421 area) also increases (Clough and Sim 1989;Sobrado and Ball 1999;Minden and Kleyer 2011), which might in turn, lead to a greater investment in crown biomass, as suggested by recent work (Minden and Kleyer 2011;Peters et al 2014).…”

Section: Discussionmentioning

confidence: 99%

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Morphological plasticity in mangrove trees: salinity-related changes in the allometry of Avicennia germinans

Vovides

Vogt

Kollert

et al. 2014

Trees

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Key Message Morphological plasticity helps plants to cope to environmental conditions. Allometric responses of the mangrove Avicennia germinans to increasing salinity are easily detectable when focusing on the top height trees. Abstract Several studies show that mangrove trees possess high species-and site-related trait allometry, suggesting large morphological plasticity that might be related to environmental conditions, but the causes of such variation are not clearly understood and systematic quantification is still missing. Both aspects are essential for a mechanistic understanding of the development and functioning of forests. We analyzed the role of salinity in the allometric relations of the mangrove Avicennia germinans, using: (1) the top height trees (trees with the largest diameters at breast height, which reflect forest properties at the maximum use of resources); (2) the slenderness coefficient (which indicates competition and environmental conditions); and (3) the crown to DBH ratio. These standard tools for forest scientists dealing with terrestrial forests are suitable to analyze the plastic responses of mangroves to salinity. First, the top height trees help to recognize structural forest properties that are not detectable when studying the whole stand. Second, we found that at salinities above 55 %, trees are less slender and develop wider crowns in relation to DBH than when growing at lower salinities. Our results suggest a significant change in allometric traits in relation to salinity, and reflect the plastic responses of tree traits in response to environmental variation. Understanding the plastic responses of plants to their environment can help to better model, predict, and manage forests in changing environments.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Morphological plasticity in mangrove trees: salinity-related changes in the allometry of Avicennia germinans

Vovides

Vogt

Kollert

et al. 2014

Trees

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“…The results indicated that antioxidant systems in roots and stems could not resist the oxidative stress, and thus, significant lipid peroxidation in roots and stems were found under PAH polluted conditions. Perhaps there are some other adaptive strategies such as anatomical adaption involved in roots and stems under polluted conditions (Cheng et al 2012b). …”

Section: Discussionmentioning

confidence: 99%

Effects of pyrene on antioxidant systems and lipid peroxidation level in mangrove plants, Bruguiera gymnorrhiza

et al. 2012

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The effects of polycyclic aromatic hydrocarbon (PAH) (pyrene) on superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase, peroxidase, malondialdehyde (MDA) and proline were studied in leaves, stems and roots of Bruguiera gymnorrhiza. The results showed that the responses of enzymatic and non-enzymatic antioxidants varied significantly among the three tissues studied. The activities of antioxidant enzymes in PAH-treated stems and roots fluctuated in different stress levels compared to the controls, while the antioxidant enzymes such as SOD, APX in leaves increased when stressed by PAH with a significant positive relation between PAH and leaf SOD or APX activity. Low PAH treatments could also stimulate proline in leaves and stems. MDA content was obviously accumulated in stems and roots under PAH stress while decreased in leaves, indicating that the increased antioxidant enzymes in leaves may partly alleviate lipid peroxidation. For pollution monitoring purpose, SOD and APX in leaves may be potential biomarkers of PAH pollution in intertidal estuaries.

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“…Previous study (Van de Mortel et al 2008) also claimed the important roles of lignin/suberin on metal detoxification in Arabidopsis, they knockout lignin/suberin biosynthesis related genes myb72 and found that Arabidopsis myb72 knockout mutant was more sensitive to Zn stresses than wild type. Besides, our previous study (Cheng et al 2012b) indicated that a moderate salinity could stimulate a lignified exodermis that delayed the entry of metals into the roots and thereby contributed to a higher metal tolerance, while N deficiency would aggravate metal toxicity. In order to further confirm the function lignin and suberin on metal detoxification in mangroves, Pb uptake, translocation and tolerance between lignin/suberin increase or inhibit mutant mangroves should further be conducted.…”

Section: Discussionmentioning

confidence: 98%

Pb uptake and tolerance in the two selected mangroves with different root lignification and suberization

et al. 2015

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Metal pollution has been widely reported in mangrove wetlands; however, the mechanisms involved in metal detoxification by mangroves are still poorly understood. This study aimed to investigate the possible function of root lignification/suberization on Pb uptake and tolerance in mangroves. Two mangroves, Acanthus ilicifolius and Rhizophora stylosa with different root lignification/suberization were selected as plant materials; the former exhibits a thin exodermis and low lignification/suberization, while the latter possesses a thick exodermis and high lignification/suberization. A pot trial with addition of Pb was conducted to investigate the differences in Pb uptake and tolerance between the two mangroves. The experiment of rhizobox was designed to explore Pb dynamics and availabilities in the rhizosphere soils, besides, the ability of Pb uptake by the excised roots and X-ray analysis for Pb distribution within roots were also detected. The results revealed that R. stylosa exhibited relatively higher Pb tolerance together with less Pb accumulations when compared to A. ilicifolius. For both species, lower proportion of exchangeable and Carbonate Pb and higher higher Fe-Mn oxides Pb were observed in the rhizosphere zone when compared to the respective non-rhizosphere zone. The results from metal uptake by the excised roots and X-ray analysis clearly showed that the thick lignified/suberized exodermis of R. stylosa could more efficiently delay Pb entering into the roots, leading to less Pb accumulation. In summary, the present study proposes a barrier property of the lignified/suberized exodermis in dealing with the stresses of Pb.

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Influence of N deficiency and salinity on metal (Pb, Zn and Cu) accumulation and tolerance by Rhizophora stylosa in relation to root anatomy and permeability

Cited by 41 publications

References 69 publications

Morphological plasticity in mangrove trees: salinity-related changes in the allometry of Avicennia germinans

Morphological plasticity in mangrove trees: salinity-related changes in the allometry of Avicennia germinans

Effects of pyrene on antioxidant systems and lipid peroxidation level in mangrove plants, Bruguiera gymnorrhiza

Pb uptake and tolerance in the two selected mangroves with different root lignification and suberization

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