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  • 1
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    Online Resource
    The Cassava Source–Sink project: opportunities and challenges for crop improvement by metabolic engineering
    Wiley ; 2020
    In:  The Plant Journal Vol. 103, No. 5 ( 2020-08), p. 1655-1665
    Details
    In: The Plant Journal, Wiley, Vol. 103, No. 5 ( 2020-08), p. 1655-1665
    Abstract: Cassava (Manihot esculenta) is one of the most important staple food crops in Sub‐Sahran Africa. The Cassava Source‐Sink project aims to boost cassava storage root yield by simultaneously improving the plants source, transport and sink capacity.
    Type of Medium: Online Resource
    ISSN: 0960-7412 , 1365-313X
    URL: Issue
    URL: Article
    DOI: 10.1111/tpj.v103.5
    DOI: 10.1111/tpj.14865
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2020961-7
    SSG: 12
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  • 2
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    A re‐assessment of sucrose signaling involved in cluster‐root formation and function in phosphate‐deficient white lupin ( Lupinus albus )
    Wiley ; 2015
    In:  Physiologia Plantarum Vol. 154, No. 3 ( 2015-07), p. 407-419
    Details
    In: Physiologia Plantarum, Wiley, Vol. 154, No. 3 ( 2015-07), p. 407-419
    Abstract: Apart from substrate functions, a signaling role of sucrose in root growth regulation is well established. This raised the question whether sucrose signals might also be involved in formation of cluster‐roots ( CRs ) under phosphate (Pi) limitation, mediating exudation of phosphorus (P)‐mobilizing root exudates, e.g. in Lupinus albus and members of the Proteaceae. Earlier studies demonstrated that CR formation in L. albus was mimicked to some extent by external application of high sucrose concentrations (25 m M ) in the presence of extremely high P supply (1–10 m M ), usually suppressing CR formation. In this study, we re‐addressed this question using an axenic hydroponic culture system with normal P supply (0.1 m M ) and a range of sucrose applications (0.25–25 m M ). The 2.5  m M sucrose concentration was comparable with internal sucrose levels in the zone of CR initiation in first‐order laterals of P‐deficient plants (3.4 m M ) and induced the same CR morphology. Similar to earlier studies, high sucrose concentrations (25 m M ) resulted in root thickening and inhibition of root elongation, associated with a 10‐fold increase of the internal sucrose level. The sucrose analog palatinose and a combination of glucose/fructose failed to stimulate CR formation under P‐sufficient conditions, demonstrating a signal function of sucrose and excluding osmotic or carbon source effects. In contrast to earlier findings, sucrose was able to induce CR formation but had no effect on CR functioning with respect to citrate exudation, in vitro activity and expression of genes encoding phosphoenolpyruvate carboxylase, secretory acid phosphatase and MATE transporters, mediating P‐mobilizing functions of CRs .
    Type of Medium: Online Resource
    ISSN: 0031-9317 , 1399-3054
    URL: Issue
    URL: Article
    DOI: 10.1111/ppl.2015.154.issue-3
    DOI: 10.1111/ppl.12311
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2015
    detail.hit.zdb_id: 208872-1
    detail.hit.zdb_id: 2020837-6
    SSG: 12
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  • 3
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    The vacuolar transporter LaMTP8 .1 detoxifies manganese in leaves of Lupinus albus
    Wiley ; 2022
    In:  Physiologia Plantarum Vol. 174, No. 6 ( 2022-11)
    Details
    In: Physiologia Plantarum, Wiley, Vol. 174, No. 6 ( 2022-11)
    Abstract: Manganese (Mn) is an essential microelement, but overaccumulation is harmful to many plant species. Most plants have similar minimal Mn requirements, but the tolerance to elevated Mn varies considerably. Mobilization of phosphate (P) by plant roots leads to increased Mn uptake, and shoot Mn levels have been reported to serve as an indicator for P mobilization efficiency in the presence of P deficiency. White lupin ( Lupinus albus L.) mobilizes P and Mn with outstanding efficiency due to the formation of determinate cluster roots that release carboxylates. The high Mn tolerance of L . albus goes along with shoot Mn accumulation, but the molecular basis of this detoxification mechanism has been unknown. In this study, we identify LaMTP8.1 as the transporter mediating vacuolar sequestration of Mn in the shoot of white lupin. The function of Mn transport was demonstrated by yeast complementation analysis, in which LaMTP8.1 detoxified Mn in pmr1 ∆ mutant cells upon elevated Mn supply. In addition, LaMTP8.1 also functioned as an iron (Fe) transporter in yeast assays. The expression of LaMTP8 . 1 was particularly high in old leaves under high Mn stress. However, low P availability per se did not result in transcriptional upregulation of LaMTP8 . 1 . Moreover, LaMTP8 . 1 expression was strongly upregulated under Fe deficiency, where it was accompanied by Mn accumulation, indicating a role in the interaction of these micronutrients in L . albus . In conclusion, the tonoplast‐localized Mn transporter LaMTP8.1 mediates Mn detoxification in leaf vacuoles, providing a mechanistic explanation for the high Mn accumulation and Mn tolerance in this species.
    Type of Medium: Online Resource
    ISSN: 0031-9317 , 1399-3054
    URL: Issue
    URL: Article
    DOI: 10.1111/ppl.v174.6
    DOI: 10.1111/ppl.13807
    RVK:
    WA 15000
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 208872-1
    detail.hit.zdb_id: 2020837-6
    SSG: 12
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  • 4
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    Ammonium ion transport by the AMT/Rh homologue LeAMT1;1
    Portland Press Ltd. ; 2006
    In:  Biochemical Journal Vol. 396, No. 3 ( 2006-06-15), p. 431-437
    Details
    In: Biochemical Journal, Portland Press Ltd., Vol. 396, No. 3 ( 2006-06-15), p. 431-437
    Abstract: AMT (ammonium transporter)/Rh (Rhesus) ammonium transporters/channels are identified in all domains of life and fulfil contrasting functions related either to ammonium acquisition or excretion. Based on functional and crystallographic high-resolution structural data, it was recently proposed that the bacterial AmtB (ammonium transporter B) is a gas channel for NH3 [Khademi, O'Connell, III, Remis, Robles-Colmenares, Miercke and Stroud (2004) Science 305, 1587–1594; Zheng, Kostrewa, Berneche, Winkler and Li (2004) Proc. Natl. Acad. Sci. U.S.A. 101, 17090–17095]. Key residues, proposed to be crucial for NH3 conduction, and the hydrophobic, but obstructed, pore were conserved in a homology model of LeAMT1;1 from tomato. Transport by LeAMT1;1 was affected by mutations of residues that were predicted to constitute the aromatic recruitment site for NH4+ at the external pore entrance. Despite the structural similarities, LeAMT1;1 was shown to transport only the ion; each transported 14C-methylammonium molecule carried a single positive elementary charge. Similarly, NH4+ (or H+/NH3) was transported, but NH3 conduction was excluded. It is concluded that related proteins and a similar molecular architecture can apparently support contrasting transport mechanisms.
    Type of Medium: Online Resource
    ISSN: 0264-6021 , 1470-8728
    URL: Article
    DOI: 10.1042/BJ20060051
    RVK:
    WA 15000
    Language: English
    Publisher: Portland Press Ltd.
    Publication Date: 2006
    detail.hit.zdb_id: 1473095-9
    SSG: 12
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  • 5
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    Plant plasma membrane water channels conduct the signalling molecule H2O2
    Portland Press Ltd. ; 2008
    In:  Biochemical Journal Vol. 414, No. 1 ( 2008-08-15), p. 53-61
    Details
    In: Biochemical Journal, Portland Press Ltd., Vol. 414, No. 1 ( 2008-08-15), p. 53-61
    Abstract: H2O2 is a relatively long-lived reactive oxygen species that signals between cells and organisms. H2O2 signalling in plants is essential for response to stress, defence against pathogens and the regulation of programmed cell death. Although H2O2 diffusion across membranes is often considered as a passive property of lipid bilayers, native membranes represent significant barriers for H2O2. In the present study we addressed the question of whether channels might facilitate H2O2 conduction across plasma membranes. The expression of several plant plasma membrane aquaporins in yeast, including PIP2;1 from Arabidopsis (where PIP is plasma membrane intrinsic protein), enhanced the toxicity of H2O2 and increased the fluorescence of dye-loaded yeast when exposed to H2O2. The sensitivity of aquaporin-expressing yeast to H2O2 was altered by mutations that alter gating and the selectivity of the aquaporins. The conduction of water, H2O2 and urea was compared, using molecular dynamics simulations based on the crystal structure of SoPIP2;1 from spinach. The calculations identify differences in the conduction between the substrates and reveal channel residues critically involved in H2O2 conduction. The results of the calculations on tetramers and monomers are in agreement with the biochemical data. Taken together, the results strongly suggest that plasma membrane aquaporin pores determine the efficiency of H2O2 signalling between cells. Aquaporins are present in most species and their capacity to facilitate the diffusion of H2O2 may be of physiological significance in many organisms and particularly in communication between different species.
    Type of Medium: Online Resource
    ISSN: 0264-6021 , 1470-8728
    URL: Article
    DOI: 10.1042/BJ20080287
    RVK:
    WA 15000
    Language: English
    Publisher: Portland Press Ltd.
    Publication Date: 2008
    detail.hit.zdb_id: 1473095-9
    SSG: 12
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  • 6
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    Function of the anion transporter At CLC ‐d in the trans ‐Golgi network
    Wiley ; 2007
    In:  The Plant Journal Vol. 50, No. 3 ( 2007-05), p. 466-474
    Details
    In: The Plant Journal, Wiley, Vol. 50, No. 3 ( 2007-05), p. 466-474
    Abstract: Anion transporting proteins of the CLC type are involved in anion homeostasis in a variety of organisms. CLCs from Arabidopsis have been shown to participate in nitrate accumulation and storage. In this study, the physiological role of the functional chloride transporter AtCLC‐d from Arabidopsis was investigated. AtCLC‐d is weakly expressed in various tissues, including the root. When transiently expressed as a GFP fusion in protoplasts, it co‐localized with the VHA‐a1 subunit of the proton‐transporting V‐type ATPase in the trans ‐Golgi network (TGN). Stable expression in plants showed that it co‐localized with the endocytic tracer dye FM4‐64 in a brefeldin A‐sensitive compartment. Immunogold electron microscopy confirmed the localization of AtCLC‐d to the TGN. Disruption of the AtCLC‐d gene by a T‐DNA insertion did not affect the nitrate and chloride contents. The overall morphology of these clcd‐1 plants was similar to that of the wild‐type, but root growth on synthetic medium was impaired. Moreover, the sensitivity of hypocotyl elongation to treatment with concanamycin A, a blocker of the V‐ATPase, was stronger in the clcd‐1 mutant. These phenotypes could be complemented by overexpression of AtCLC‐d in the mutant background. The results suggest that the luminal pH in the trans ‐Golgi network is adjusted by AtCLC‐d‐mediated transport of a counter anion such as Cl − or NO 3 − .
    Type of Medium: Online Resource
    ISSN: 0960-7412 , 1365-313X
    URL: Issue
    URL: Article
    DOI: 10.1111/tpj.2007.50.issue-3
    DOI: 10.1111/j.1365-313X.2007.03061.x
    Language: English
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 2020961-7
    SSG: 12
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  • 7
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    The role of N form supply for PGPM‐host plant interactions in maize
    Wiley ; 2019
    In:  Journal of Plant Nutrition and Soil Science Vol. 182, No. 6 ( 2019-12), p. 908-920
    Details
    In: Journal of Plant Nutrition and Soil Science, Wiley, Vol. 182, No. 6 ( 2019-12), p. 908-920
    Abstract: The form of nitrogen (N) supply has a significant impact on rhizosphere chemistry and root growth responses of higher plants. The respective effects are also employed as management options to improve nutrient acquisition and to minimize nutrient losses in cropping systems. However, surprisingly little is known concerning the interactions with rhizosphere biota. In this study, we investigated the effects of selected bacterial and fungal inoculants with proven plant growth‐promoting and phosphate (P)‐solubilizing potential (plant growth‐promoting microorganisms, PGPM) in maize with nitrate or stabilized ammonium supply, on soils with limited P availability and sparingly soluble rock phosphate (Rock‐P) applied as P fertilizer. The combination of the bacterial inoculants Pseudomonas sp. DSMZ 13134 (Proradix) and Bacillus amyloliquefaciens FZB42 with ammonium sulphate fertilization, stabilized with the nitrification inhibitor 3,4‐dimethylpyrazole‐phosphate (DMPP), resulted in a superior shoot biomass production (79–111%) and shoot P accumulation (109–235%) as compared with nitrate supply. This effect could be partially attributed to (1) ammonium‐induced rhizosphere acidification via increased root extrusion of protons, (2) promotion of root hair elongation, and (3) increased shoot concentrations of hormonal growth regulators (indole‐3‐acetic acid, zeatin, gibberellic acid). The effects, induced by the microbial inoculants were mainly related to increased root length development (43–44%), associated with a 60% increase in auxin production potential. No inoculant effects were detected on root hair elongation or on chemical modifications of the rhizosphere involved in P solubilisation, such as rhizosphere acidification, release of carboxylates or secretory phosphohydrolases. However, the ammonium‐induced stimulation of root hair elongation increased preferential sites for root colonization by the selected inoculants, which may explain the increase in rhizosphere abundance of PGPMs, exemplarily recorded for the fungal inoculant Trichoderma harzianum OMG16 (210%). The presented data suggest a network of positive interactions between stabilized ammonium fertilization and plant growth‐promoting functions of various bacterial and fungal PGPM inoculants. This offers perspectives to increase the efficiency and the reproducibility of PGPM‐assisted fertilization strategies.
    Type of Medium: Online Resource
    ISSN: 1436-8730 , 1522-2624
    URL: Issue
    URL: Article
    DOI: 10.1002/jpln.v182.6
    DOI: 10.1002/jpln.201900133
    RVK:
    RA 5430
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 1481142-X
    detail.hit.zdb_id: 1470765-2
    detail.hit.zdb_id: 200063-5
    SSG: 12
    SSG: 13
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  • 8
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    Nitrogen improves the recovery of maize plants under repeated drought stress
    Wiley ; 2022
    In:  Journal of Plant Nutrition and Soil Science Vol. 185, No. 5 ( 2022-10), p. 612-621
    Details
    In: Journal of Plant Nutrition and Soil Science, Wiley, Vol. 185, No. 5 ( 2022-10), p. 612-621
    Abstract: Modern high‐yielding crops, such as maize, are characterized by extensive yield stability across various environments and can cope with repetitive periods of moderate water shortage. However, there is conflicting evidence on how the nutritional status of the plants contributes to stress resilience and whether farmers have management options via nitrogen fertilization. Aims We aimed at identifying factors relevant for improved growth recovery of maize after repeated water deficit stress (WDS). Methods A pot experiment with maize and repeated WDS was conducted. Growth and recovery from stress and physiological parameters were measured. Results The growth penalty of juvenile maize plants exposed to a moderate WDS was lost after additional exposure to a 2‐week WDS. Primed plants transiently contained more osmolytes and performed superior in the second recovery phase when nitrogen fertilization was applied directly before the second WDS. Nitrogen fertilization did not affect the osmolyte quantity, and primed plants had transiently higher antioxidant levels, higher reactive oxygen species production and recovered more quickly with N addition. Conclusions Pot experiments suggest that nitrogen fertilization may be an option to improve maize resilience to repeated WDS, a hypothesis that should be tested more rigorously in the field.
    Type of Medium: Online Resource
    ISSN: 1436-8730 , 1522-2624
    URL: Issue
    URL: Article
    DOI: 10.1002/jpln.v185.5
    DOI: 10.1002/jpln.202200138
    RVK:
    RA 5430
    Language: English
    Publisher: Wiley
    Publication Date: 2022
    detail.hit.zdb_id: 1481142-X
    detail.hit.zdb_id: 1470765-2
    detail.hit.zdb_id: 200063-5
    SSG: 12
    SSG: 13
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  • 9
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    Genes and Proteins for Solute Transport and Sensing
    BioOne ; 2002
    In:  The Arabidopsis Book Vol. 1 ( 2002-01), p. e0092-
    Details
    In: The Arabidopsis Book, BioOne, Vol. 1 ( 2002-01), p. e0092-
    Type of Medium: Online Resource
    ISSN: 1543-8120 , 1543-8120
    URL: Article
    DOI: 10.1199/tab.0092
    Language: English
    Publisher: BioOne
    Publication Date: 2002
    detail.hit.zdb_id: 2179359-1
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  • 10
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    Online Resource
    Maize Inoculation with Microbial Consortia: Contrasting Effects on Rhizosphere Activities, Nutrient Acquisition and Early Growth in Different Soils
    MDPI AG ; 2019
    In:  Microorganisms Vol. 7, No. 9 ( 2019-09-07), p. 329-
    Details
    In: Microorganisms, MDPI AG, Vol. 7, No. 9 ( 2019-09-07), p. 329-
    Abstract: The benefit of plant growth-promoting microorganisms (PGPMs) as plant inoculants is influenced by a wide range of environmental factors. Therefore, microbial consortia products (MCPs) based on multiple PGPM strains with complementary functions, have been proposed as superior, particularly under challenging environmental conditions and for restoration of beneficial microbial communities in disturbed soil environments. To test this hypothesis, the performance of a commercial MCP inoculant based on 22 PGPM strains was investigated in greenhouse experiments with maize on three soils with contrasting pH, organic matter content and microbial activity, under different P and N fertilization regimes. Interestingly, the MCP inoculant stimulated root and shoot growth and improved the acquisition of macronutrients only on a freshly collected field soil with high organic matter content, exclusively in combination with stabilized ammonium fertilization. This was associated with transiently increased expression of AuxIAA5 in the root tissue, a gene responsive to exogenous auxin supply, suggesting root growth promotion by microbial auxin production as a major mode of action of the MCP inoculant. High microbial activity was indicated by intense expression of soil enzyme activities involved in C, N and P cycling in the rhizosphere (cellulase, leucine peptidase, alkaline and acid phosphatases) but without MCP effects. By contrast, the MCP inoculation did not affect maize biomass production or nutrient acquisition on soils with very little Corg and low microbial activity, although moderate stimulation of rhizosphere enzymes involved in N and P cycling was recorded. There was also no indication for MCP-induced solubilization of Ca-phosphates on a calcareous sub-soil fertilized with rock-phosphate. The results demonstrate that the combination of multiple PGPM strains with complementary properties as MCP inoculants does not necessarily translate into plant benefits in challenging environments. Thus, a better understanding of the conditions determining successful MCP application is mandatory.
    Type of Medium: Online Resource
    ISSN: 2076-2607
    URL: Article
    DOI: 10.3390/microorganisms7090329
    Language: English
    Publisher: MDPI AG
    Publication Date: 2019
    detail.hit.zdb_id: 2720891-6
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