Salinity tolerance of halophyte Atriplex nummularia L. grown under increasing NaCl levels

Araujo, Sandro Alexandre Marinho de; Silveira, Joaquim Albenísio Gomes da; Almeida, Tânia; Rocha, Iza M. A.; Morais, Déborah L. de; Viégas, Ricardo Almeida

doi:10.1590/s1415-43662006000400010

Cited by 49 publications

(19 citation statements)

References 25 publications

(31 reference statements)

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“…Visible symptoms of early senescence in old leaves (chlorosis, necrosis) were observed only under Na 2 SO 4 treatment, in association with chlorophyll a decrease. In NaCl and two salt-treated plants, in contrast, chlorophyll b was decreased, and chlorosis symptoms were not evident, in coincidence with the results reported by Araújo et al (2006) in the halophyte Atriplex nummularia and Koyro (2006) in Plantago coronopus. Adaptations of light harvesting capacity may be used to reduce (optimize) photosynthetic efficiency, and consequently reduce oxidative stress.…”

Section: Discussionsupporting

confidence: 87%

Changes in the levels of jasmonates and free polyamines induced by Na2SO4 and NaCl in roots and leaves of the halophyte Prosopis strombulifera

et al. 2012

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Prosopis strombulifera, a common legume in high-salinity soils of Argentina, is a useful model for elucidation of salt tolerance mechanisms and specific biochemical pathways in halophytes, since its NaCl tolerance exceeds the limit described for most halophytic plants. We analyzed the effects of the increasing concentration of two main soil salts, Na2SO4 and NaCl, on growth parameters of P. strombulifera, chlorophyll levels, and content of jasmonates (JAs) and polyamines (PAs), which are key molecules involved in stress responses. P. strombulifera showed a halophytic response (growth promotion) to NaCl, but strong growth inhibition by iso-osmotic solutions of Na2SO4. Chlorophyll levels, number of leaves and leaf area were also differentially affected. An important finding was the partial alleviation of SO 2− 4toxicity by treatment with two-salt mixture. JAs are not directly involved in salt tolerance in this species since its levels decrease under all salt treatments. Beneficial effects of Putrescine (Put) accumulation in NaCl treated plants maybe inferred probably associated with the antioxidative defense system. Another novel finding is the accumulation of the uncommon PA cadaverine in roots under high Na2SO4, which may be related to SO 2− 4 toxicity.

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Section: Discussionsupporting

confidence: 87%

Changes in the levels of jasmonates and free polyamines induced by Na2SO4 and NaCl in roots and leaves of the halophyte Prosopis strombulifera

et al. 2012

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“…The moisture contents were selected based on the SWRCC. The waters for irrigation were prepared in the laboratory using two sources of salts, one composed of NaCl and the other composed of a mixture of salts in proportions similar to those found in a well located in the experimental area, which were produced maintaining 1 Clay dispersed in water; 2 Soil bulk density; 3 Soil particle density; 4 Index of dispersion (CDW/Clay); six values of electrical conductivity: 0, 5, 10, 20, 30 and 40 dS m -1 (Araújo et al, 2006;Silveira et al, 2009;Belkheiri & Mulas, 2013). In order to justify the composition of the mixture of salts necessary for the treatments, water samples were collected in an Artesian well located close to the area of soil collection.…”

Section: Methodsmentioning

confidence: 99%

Fluorescence of chlorophyll a and photosynthetic pigments in Atriplex nummularia under abiotic stresses

Melo

Souza

Cunha

2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C TChlorophyll a fluorescence is a very useful tool in ecophysiological studies to analyze the photosynthetic performance of plants under biotic and abiotic stresses. This research aimed to evaluate the parameters of the fluorescence of chlorophyll a, contents of chlorophyll a, b and total, and carotenoids in Atriplex nummularia cultivated under water stress (37 and 70% of field capacity) and salt stress (irrigation water with electrical conductivity of 0, 5, 10, 20, 30 and 40 dS m -1 ), besides two sources of salts: NaCl and a mixture of salts of Ca 2+ , Mg +2 , K + , Na + and Cl -, in a 6 x 2 x 2 factorial, with 4 replicates, totaling 96 experimental plots. At 91 days after transplanting, the initial fluorescence (F 0 ), maximum fluorescence (F m ), potential quantum efficiency of photosystem II (F v /F m ), F v /F 0 ratio and the contents of chlorophyll a, b, and total and carotenoids were determined. All assessed parameters decreased as a standard response to salt stress, except F 0 , which had, as a characteristic, the increase in its values under stress conditions. The emission parameters for Atriplex nummularia varied with the type of salt present in the irrigation water.Fluorescência da clorofila a e pigmentos fotossintéticos em Atriplex nummularia sob estresses abióticos R E S U M OA fluorescência da clorofila a é uma ferramenta de grande utilidade em estudos ecofisiológicos para a análise da performance fotossintética de plantas sob estresses bióticos e abióticos. Objetivou-se avaliar os parâmetros da fluorescência da clorofila a, teores de clorofila a, b e total e carotenoides em Atriplex nummularia cultivada sob estresses hídrico (37 e 70% da capacidade de campo) e salino (água de irrigação com condutividade elétrica de 0, 5, 10, 20, 30 e 40 dS m -1 ), além de duas fontes de sais: NaCl e uma mistura com sais de Ca 2+ , Mg 2+ , K + , Na + e Cl -, em fatorial 6 x 2 x 2 com 4 repetições totalizando 96 parcelas experimentais. Aos 91 dias após o transplantio foram determinadas a fluorescência inicial (F 0 ), a fluorescência máxima (F m ), a eficiência quântica potencial do fotossistema II (F v /F m ) e a razão F v /F 0 e os teores de clorofila a, b, total e carotenoides. Os parâmetros de emissão avaliados reduziram como resposta padrão ao estresse salino, com exceção do F 0 que tem, como característica, o aumento de seus valores quando em condições de estresse. Os parâmetros de emissão para a Atriplex nummularia variaram de acordo com o tipo de sal presente na água de irrigação. Key words:photosynthesis water and salt stress halophyte Palavras-chave: fotossíntese estresse salino e hídrico halófita

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“…Such storage was likely due to the presence of small vesicles found in the epidermis of plants (Freire et al, 2010). Halophytes are able to provide osmotic adjustment through the uptake and accumulation of the salts in leaves -a tolerance mechanism in response to high salinity levels (Araújo et al, 2006). This process takes place with cellular compartmentalization of salt ions into vacuoles, decreasing osmotic potential of the cytoplasm; hence, keeping metabolism balance and enzymatic functions (Dias and Blanco, 2010).…”

Section: Biomass Yield and Phytoextraction Of Saltsmentioning

confidence: 99%

Atriplex nummularia Lindl. as alternative for improving salt-affected soils conditions in semiarid environments: a field experiment

Silva

Freire

et al. 2016

Chilean J. Agric. Res.

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Atriplex nummularia Lindl. represents a cost-effective alternative for improving salt-affected soils in arid and semiarid environments due to its high adaptability to salinity and water deficiency. This study aimed to investigate soil physical-chemical changes in response to A. nummularia cultivation under field condition. Additionally, we quantified its biomass yield and phytoextraction potential. Two treatments were evaluated: soil cultivated with Atriplex under two crop densities (1 × 1 and 2 × 2 m), and a control (bared soil) with four replicates. The samples were taken at three soil depths (0-5, 15-20, and 40-45 cm). In general, dry biomass yield for leaves, stems and roots, as well as the bulk density and the hydraulic conductivity of the soil were sensitive to crop densities. Thus, the use of A. nummularia can be recommended for phytoremediation of salt-affected soils, as well as to improve soil physical condition. When it comes to salt phytoextraction per area, we recommend planting A. nummularia at a 1 × 1 m crop density. The greater accumulation of salts was observed in leaves, as observed for Na (82% roughly). However, in order to improve soil physical conditions, we suggest the management of A. nummularia under 2 × 2 m crop density. Pruning was fundamental to increase the biomass yield and, consequently, the phytoextraction of specific ions, e.g., Na, Cl. It was responsible for 83% and 88% of the total dry biomass at 1 × 1 and 2 × 2 m crop density, respectively.

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Salinity tolerance of halophyte Atriplex nummularia L. grown under increasing NaCl levels

Cited by 49 publications

References 25 publications

Changes in the levels of jasmonates and free polyamines induced by Na2SO4 and NaCl in roots and leaves of the halophyte Prosopis strombulifera

Changes in the levels of jasmonates and free polyamines induced by Na2SO4 and NaCl in roots and leaves of the halophyte Prosopis strombulifera

Fluorescence of chlorophyll a and photosynthetic pigments in Atriplex nummularia under abiotic stresses

Atriplex nummularia Lindl. as alternative for improving salt-affected soils conditions in semiarid environments: a field experiment

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