Distribution of Ni and Zn in the leaves of<i>Thlaspi japonicum</i>growing on ultramafic soil

Mizuno, Naoharu; Nosaka, Shiro; Mizuno, Takafumi; Horie, Kenji; Obata, Hitoshi

doi:10.1080/00380768.2003.10409984

Cited by 42 publications

(16 citation statements)

References 16 publications

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“…Therefore, more Mn was accumulated at the end of the transpiration stream, indicating a transpiration-driven distribution pattern of Mn in the leaf. The distribution pattern of Mn within a leaf of P. acinosa is similar to those found for Cd, Ni, Al or Mn in the leaves of other plants, as reported by Cosio et al (2005), Mizuno et al (2003), Shen and Ma (2001) and Kitao et al (2001). Additional results showed that the Mn toxicity symptom associated with the 28-day exposure of P. acinosa plants to 5 mM Mn (brown spots) was correlated to the distribution of Mn in the leaf.…”

Section: Discussionsupporting

confidence: 79%

Distribution and mobility of manganese in the hyperaccumulator plant Phytolacca acinosa Roxb. (Phytolaccaceae)

Shi

Chen

et al. 2006

Plant Soil

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The distribution and mobility of manganese (Mn) in the hyperaccumulator plant species Phytolacca acinosa Roxb. (Phytolaccaceae) were investigated in a hydroponic system. The plants were exposed to 2 or 5 mM Mn for up to 28 days. For any given plant, the Mn content in the mature leaves (nos. 5-9) was always higher than that in the old (nos. 1-4) and young leaves (nos. 10-14). Within the different parts of a leaf, Mn was preferentially accumulated in the leaf marginal area, where the observed level was threefold higher than that in the midrib. Crosssectional analysis of the leaf revealed that the concentration of Mn was higher in the leaf epidermis than in the mesophyll. Cell fractionation analysis with P. acinosa leaves showed that most of the Mn (78.4%) was present in the final supernatant fraction (following centrifugation at 20,000 g for 45 min). The distribution of Mn in the leaves of P. acinosa was controlled mainly by the transpiration rate. Our investigation demonstrated that Mn was readily transported from the roots to shoots of P. acinosa but that it could not be remobilized readily after it reached leaves.

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Section: Discussionsupporting

confidence: 79%

Distribution and mobility of manganese in the hyperaccumulator plant Phytolacca acinosa Roxb. (Phytolaccaceae)

Shi

Chen

et al. 2006

Plant Soil

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“…It also reduces flowers and fruits of several plant species (Balaguer et al 1998;Mizuno et al 2003). An example of Ni toxicity appeared in four cultivars of blackgram (Vigna mungo), grown in sandy loam soil (pH 6.3) and amended with 0, 50, 100, 150, or 200 mg Ni kg −1 ; these plants displayed a reduction in the following: root and shoot lengths, dry matter yields, number of root nodules, and leaf area (Chawan 1995).…”

Section: Yield and Yield Componentsmentioning

confidence: 99%

“…Using a microscope, dimethylglyoxime-staining disclosed a Ni-compound presenting as rodshaped crystals, and these appeared mainly in areas around stomata and projections of the leaf edge. In addition, a considerable amount of Ni was found to be excreted via the guttation fluids (Mizuno et al 2003) Heavy metals have been shown to alter stem tissue organization in some crop plants. In particular, Ni caused disorganization of epidermal cells and distortion and disintegration of root cortical cells of wheat and pigeon pea (Setia and Bala 1994;Sresty and Rao 1999).…”

Section: Yield and Yield Componentsmentioning

confidence: 99%

Essential Roles and Hazardous Effects of Nickel in Plants

Ahmad

Ashraf²

2011

Reviews of Environmental Contamination and Toxicology

140

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With the world's ever increasing human population, the issues related to environmental degradation of toxicant chemicals are becoming more serious. Humans have accelerated the emission to the environment of many organic and inorganic pollutants such as pesticides, salts, petroleum products, acids, heavy metals, etc. Among different environmental heavy-metal pollutants, Ni has gained considerable attention in recent years, because of its rapidly increasing concentrations in soil, air, and water in different parts of the world. The main mechanisms by which Ni is taken up by plants are passive diffusion and active transport. Soluble Ni compounds are preferably absorbed by plants passively, through a cation transport system; chelated Ni compounds are taken up through secondary, active-transport-mediated means, using transport proteins such as permeases. Insoluble Ni compounds primarily enter plant root cells through endocytosis. Once absorbed by roots, Ni is easily transported to shoots via the xylem through the transpiration stream and can accumulate in neonatal parts such as buds, fruits, and seeds. The Ni transport and retranslocation processes are strongly regulated by metal-ligand complexes (such as nicotianamine, histidine, and organic acids) and by some proteins that specifically bind and transport Ni. Nickel, in low concentrations, fulfills a variety of essential roles in plants, bacteria, and fungi. Therefore, Ni deficiency produces an array of effects on growth and metabolism of plants, including reduced growth, and induction of senescence, leaf and meristem chlorosis, alterations in N metabolism, and reduced Fe uptake. In addition, Ni is a constituent of several metallo-enzymes such as urease, superoxide dismutase, NiFe hydrogenases, methyl coenzyme M reductase, carbon monoxide dehydrogenase, acetyl coenzyme-A synthase, hydrogenases, and RNase-A. Therefore, Ni deficiencies in plants reduce urease activity, disturb N assimilation, and reduce scavenging of superoxide free radical. In bacteria, Ni participates in several important metabolic reactions such as hydrogen metabolism, methane biogenesis, and acetogenesis. Although Ni is metabolically important in plants, it is toxic to most plant species when present at excessive amounts in soil and in nutrient solution. High Ni concentrations in growth media severely retards seed germinability of many crops. This effect of Ni is a direct one on the activities of amylases, proteases, and ribonucleases, thereby affecting the digestion and mobilization of food reserves in germinating seeds. At vegetative stages, high Ni concentrations retard shoot and root growth, affect branching development, deform various plant parts, produce abnormal flower shape, decrease biomass production, induce leaf spotting, disturb mitotic root tips, and produce Fe deficiency that leads to chlorosis and foliar necrosis. Additionally, excess Ni also affects nutrient absorption by roots, impairs plant metabolism, inhibits photosynthesis and transpiration, and causes ultrastructural modificat...

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“…Previously we described the accumulation of Ni in lower epidermal cells, especially around the stomata in crystal form in a Japanese Ni hyperaccumulator Thlaspi japonicum [16], the sole Ni hyperaccumulator found in Japan that accumulates about 2500 mg kg -1 Ni in its shoot [14,20], and suggested that transpiration of T. japonicum is one source of Ni hyperaccumulation. This system is predicted to utilize Ni 2+ -transporters for Ni excretion by guttation from the end of veins, and protect the cells from the damage by a high Ni concentration.…”

Section: Introductionmentioning

confidence: 98%

Cloning of three ZIP/Nramp transporter genes from a Ni hyperaccumulator plant Thlaspi japonicum and their Ni2+-transport abilities

Mizuno¹,

Usui²,

Horie³

et al. 2005

Plant Physiology and Biochemistry

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143

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Distribution of Ni and Zn in the leaves ofThlaspi japonicumgrowing on ultramafic soil

Cited by 42 publications

References 16 publications

Distribution and mobility of manganese in the hyperaccumulator plant Phytolacca acinosa Roxb. (Phytolaccaceae)

Distribution and mobility of manganese in the hyperaccumulator plant Phytolacca acinosa Roxb. (Phytolaccaceae)

Essential Roles and Hazardous Effects of Nickel in Plants

Cloning of three ZIP/Nramp transporter genes from a Ni hyperaccumulator plant Thlaspi japonicum and their Ni2+-transport abilities

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