A series of new hybrid vanadium chalcogenoarsenates(III) [VIII(en)2AsIIIS3] (1, en = ethylenediamine), [VIII(dap)2AsIIISe3] (2, dap = 1,2-diaminopropane), [VIII(teta)AsIIIQ3] {Q = S (3), Se (4), teta = triethylene-tetramine}, and [VIII2(en)6(μ2-O)][As2Se5] (5)...
Nonribosomal peptide synthetases (NPS) are known for the biosynthesis of antibiotics, toxins, and siderophore production. They are also a virulence determinant in different phytopathogens. However, until now, the functional characterization of NPS in Verticillium dahliae has not been reported. Deletion of the NPS gene in V. dahliae led to the decrease of conidia, microsclerotia, and pathogenicity. ΔVdNPS strains were tolerant to H2O2, and the genes involved in H2O2 detoxification, iron/copper transport, and cytoskeleton were differentially expressed in ΔVdNPS. Interestingly, ΔVdNPS strains exhibited hypersensitivity to salicylic acid (SA), and the genes involved in SA hydroxylation were up-regulated in ΔVdNPS compared with wild-type V. dahliae under SA stress. Additionally, during infection, ΔVdNPS induced more pathogenesis-related gene expression, higher reactive oxygen species production, and stronger SA-mediated signaling transduction in host to overcome pathogen. Uncovering the function of VdNPS in pathogenicity could provide a reliable theoretical basis for the development of cultivars with durable resistance against V. dahliae-associated diseases.
Two
organic hybrid manganese selenoarsenates, [Mn(en)3][MnAsII
2Se4] (1; en
= ethanediamine) and {[Mn(atep)]2[Mn(tepa)](AsVSe4)2} [2; atep = 4-(2-aminoethyl)triethylenetetramine],
were made under mild solvothermal conditions. 1 is a
new type of one-dimensional low-valent selenoarsenate(II) constructed
by the linkages of tetrahedral [MnSe4] units and two manners
of bridging of [AsII
2Se4]4– anions. 2 comprises a neutral {[Mn(atep)]2[Mn(tepa)](AsVSe4)2} molecule with
a rare seven-coordinated manganese center, which represents the sole
example of an organic hybrid selenoarsenate with the [Mn(tepa)]2+ complex as the bridging group. Both 1 and 2 exhibit special photocurrent responses upon visible-light
illumination and magnetic properties.
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