Zinc in pollen and its incorporation into seeds

Polar, Emine

doi:10.1007/bf00388064

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…When Zn is no longer applied to fully fertile plants rescued by Zn supplementation, infertility is the first visible effect (data not shown). This is consistent with the measurement of high Zn concentrations in pollen of bean (Phaseolus vulgaris) and tobacco (Nicotiana tabacum), much of which was incorporated into embryos at fertilization (Polar, 1975). The HMA2p-GUS and HMA4p-GUS constructs are both expressed in developing anthers, particularly the tapetum, and RT-PCR experiments have confirmed expression of both HMA2 and HMA4 mRNA in this tissue.…”

Section: Discussionsupporting

confidence: 87%

P-Type ATPase Heavy Metal Transporters with Roles in Essential Zinc Homeostasis in Arabidopsis

et al. 2004

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Arabidopsis thaliana has eight genes encoding members of the type 1 B heavy metal-transporting subfamily of the P-type ATPases. Three of these transporters, HMA2, HMA3, and HMA4, are closely related to each other and are most similar in sequence to the divalent heavy metal cation transporters of prokaryotes. To determine the function of these transporters in metal homeostasis, we have identified and characterized mutants affected in each. Whereas the individual mutants exhibited no apparent phenotype, hma2 hma4 double mutants had a nutritional deficiency phenotype that could be compensated for by increasing the level of Zn, but not Cu or Co, in the growth medium. Levels of Zn, but not other essential elements, in the shoot tissues of a hma2 hma4 double mutant and, to a lesser extent, of a hma4 single mutant were decreased compared with the wild type. Together, these observations indicate a primary role for HMA2 and HMA4 in essential Zn homeostasis. HMA2promoter-and HMA4promoter-reporter gene constructs provide evidence that HMA2 and HMA4 expression is predominantly in the vascular tissues of roots, stems, and leaves. In addition, expression of the genes in developing anthers was confirmed by RT-PCR and was consistent with a male-sterile phenotype in the double mutant. HMA2 appears to be localized to the plasma membrane, as indicated by protein gel blot analysis of membrane fractions using isoform-specific antibodies and by the visualization of an HMA2-green fluorescent protein fusion by confocal microscopy. These observations are consistent with a role for HMA2 and HMA4 in Zn translocation. hma2 and hma4 mutations both conferred increased sensitivity to Cd in a phytochelatin-deficient mutant background, suggesting that they may also influence Cd detoxification.

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Section: Discussionsupporting

confidence: 87%

P-Type ATPase Heavy Metal Transporters with Roles in Essential Zinc Homeostasis in Arabidopsis

et al. 2004

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“…In fact, Zn is present in pollen grains. [56] Furthermore, we found that Cu and Zn, which are considered to be emitted from metallurgical industrial activity, [52] are associated with different factors obtained from Varimax rotated factor analysis of trace metals (see Table 3).…”

Section: Nh 4 + and K + : Biomass Burning Emissionsmentioning

confidence: 92%

Characteristics, seasonality and sources of inorganic ions and trace metals in North-east Asian aerosols

et al. 2015

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Environmental context Atmospheric aerosols affect the Earth's climate system and can cause adverse effects on human health depending on their loading and chemical composition. This study presents the chemical characteristics and seasonality of inorganic ions and trace metals in atmospheric aerosols from Sapporo, northern Japan, and explores their possible sources. The work is relevant for our understanding of atmospheric composition and climate change. Abstract To better understand the characteristics, seasonality and sources of inorganic aerosols in North-east Asia, we studied total suspended particulate samples collected in Sapporo, northern Japan for inorganic ions and trace metals over a 1-year period. SO42- was found as the most abundant ionic species, which accounted for on average 43 +/- 15% of the measured total ionic mass followed by Cl-approximate to NO3-approximate to Na+. Among the metals determined, Ca was found as the most abundant (45 +/- 5.2% of the measured total metals) followed by Fe. Temporal variations of methanesulfonate (MS-) and SO42- showed a clear seasonal pattern with a maximum in summer followed by spring. Cl-, NO3-, NH4+ and K+ showed increasing trends from mid autumn to winter. Na+, Ca2+ and Mg2+ and crustal metals (Al, Ca, Fe, Ti and Mn) peaked in early spring. Na+ and Mg2+ and Ni, Cu and As were abundant in autumn whereas Zn was in spring. However, Cd and Pb did not show any seasonality. Based on comparisons of such seasonal trends with those of organic tracers as well as the air mass trajectories, we infer that the seasonality in inorganic aerosols in the North-east Asian atmosphere is mainly controlled by their season-specific source(s): soil dust in early spring, biogenic emissions in spring-summer, microbial activities in autumn and forest fires and biomass burning in autumn-winter. However, contributions from anthropogenic sources are significant in all seasons. This study also suggests that fungal spores partly contribute to some trace metals (i.e. Ni, Cu and As) whereas pollen contributes to Zn in aerosols

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Plant Genotypic Differences Under Metal Deficient and Enriched Conditions

Lindberg

Greger

2002

Physiology and Biochemistry of Metal Toxicity and Tolerance in Plants

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Zinc in pollen and its incorporation into seeds

Cited by 7 publications

References 12 publications

P-Type ATPase Heavy Metal Transporters with Roles in Essential Zinc Homeostasis in Arabidopsis

P-Type ATPase Heavy Metal Transporters with Roles in Essential Zinc Homeostasis in Arabidopsis

Characteristics, seasonality and sources of inorganic ions and trace metals in North-east Asian aerosols

Plant Genotypic Differences Under Metal Deficient and Enriched Conditions

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