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Xuemin Wang - One of the best experts on this subject based on the ideXlab platform.

Jean-benoit Morel - One of the best experts on this subject based on the ideXlab platform.

  • Plant Hormones a fungal point of view
    Molecular Plant Pathology, 2016
    Co-Authors: Emilie Chanclud, Jean-benoit Morel
    Abstract:

    Summary Most classical Plant Hormones are also produced by pathogenic and symbiotic fungi. The way in which these molecules favour the invasion of Plant tissues and the development of fungi inside Plant tissues is still largely unknown. In this review, we examine the different roles of such hormone production by pathogenic fungi. Converging evidence suggests that these fungal-derived molecules have potentially two modes of action: (i) they may perturb Plant processes, either positively or negatively, to favour invasion and nutrient uptake; and (ii) they may also act as signals for the fungi themselves to engage appropriate developmental and physiological processes adapted to their environment. Indirect evidence suggests that abscisic acid, gibberellic acid and ethylene produced by fungi participate in pathogenicity. There is now evidence that auxin and cytokinins could be positive regulators required for virulence. Further research should establish whether or not fungal-derived Hormones act like other fungal effectors.

  • Plant Hormones: a fungal point of view
    Molecular plant pathology, 2016
    Co-Authors: Emilie Chanclud, Jean-benoit Morel
    Abstract:

    Most classical Plant Hormones are also produced by pathogenic and symbiotic fungi. The way these molecules favor the invasion of Plant tissues and the development of fungi inside Plant tissues is still largely unknown. In this review, we examine the different roles of such hormone production by pathogenic fungi. Converging evidence suggest that these fungal-derived molecules have potentially two modes of action: (i) they may perturb Plant processes, either positively or negatively, to favor invasion and nutrient uptake and (ii) they may also act as signals for the fungi themselves to engage appropriate developmental and physiological processes adapted to their environment. Indirect evidences suggest that abscisic acid, gibberellic acid and ethylene produced by fungi participate to pathogenicity. There is now evidence that auxin and cytokinins could be positive regulators required for virulence. Further research should establish whether or not fungal-derived Hormones act like other fungal effectors. This article is protected by copyright. All rights reserved.

Guoan Luo - One of the best experts on this subject based on the ideXlab platform.

  • Fragmentation pathway studies of several Plant Hormones using an electrospray ionization-quadrupole/time-of-flight mass spectrometer
    International Journal of Mass Spectrometry, 2013
    Co-Authors: Hongzhi Zhao, Chunfeng Xie, Shengyou Song, Gang Bai, Qionglin Liang, Min Jiang, Jing Wang, Guoan Luo
    Abstract:

    Auxins, cytokinins (CKs), gibberellins (GAs), and abscisic acid (ABA) are four classes of Plant Hormones, which play important roles in phytophysiology. However, few mass spectrometric fragmentation pathway studies of these compounds have been performed using a high-resolution mass spectrometer. Therefore, there is an urgent need to research the fragmentation pathways of classic Plant Hormones. In this study, the fragmentation pathways of four types of Plant Hormones were studied by employing an electrospray ionization-quadrupole/time- of-flight (ESI-Q/TOF) mass spectrometer. The accurate masses of the ions in the mass spectrometer (MS) and the product ions in the MS/MS were combined and used to obtain the MS fragmentation pathways of these compounds. The exact mass-to-charge ratio for each product ion was determined to deduce the elemental compositions for each compound. Most of the ions were assigned according to the collected high-resolution accurate mass data, and typical fragmentation pathways of the four classes of Plant Hormones were proposed. Furthermore, a comprehensive MS/MS spectra library of the Plant Hormones was established for the first time using ESI-Q/TOF. For instance, a characteristic mass signal of m/z 130 was identified for the product ions of the indole 3-acetic acid homologue auxins in the positive ion mode and for the characteristic neutral loss of CO2CO2H2O for gibberellin in the negative ion mode. These findings are valuable for the identification of a variety of Plant Hormones and could also provide a basis for developing MS-based methods of detecting or screening a target class of Plant Hormones in Plant extracts. © 2012 Elsevier B.V.

Ruth Welti - One of the best experts on this subject based on the ideXlab platform.

Yuqi Feng - One of the best experts on this subject based on the ideXlab platform.

  • highly sensitive profiling assay of acidic Plant Hormones using a novel mass probe by capillary electrophoresis time of flight mass spectrometry
    Journal of Chromatography B, 2011
    Co-Authors: Mingluan Chen, Yunqing Huang, Bifeng Yuan, Yuqi Feng
    Abstract:

    Abstract Plant Hormones play crucial roles in Plant growth and development. However, up to date, identification and quantification of acidic Plant Hormones with trace amount in complicated Plant matrix is still a challenge. In current study, we developed a high sensitive assay for the determination of acidic Plant Hormones in rice by combining capillary electrophoresis and electrospray ionization-time of flight-mass spectrometry (CE-ESI-TOF-MS). To improve the detection sensitivity of acidic Plant Hormones, 3-bromoactonyltrimethylammonium bromide (BTA) was synthesized as a new mass probe, which can react efficiently with acidic Plant Hormones in acetonitrile containing triethylamine (TEA). The positively charged BTA-derivatives were separated by CE using amino-coated capillary, which provided a reversed electroosmotic flow (EOF) at low pH, as well as reduced the adsorption of BTA-derivatives on the inner wall of capillary. Using the CE-ESI-TOF-MS method developed in current study, 15 acidic Plant Hormones, including 10 gibberellins (GAs), were identified and quantified with good linearities from 1.3 to 850 ng/mL with linear coefficient R 2 values of >0.99. The limits of detection (LODs) were in the range of 0.34–4.59 ng/mL. Recoveries of compounds from spiked beverage samples ranged from 84.6 to 112.2%. And a good reproducibility was obtained by evaluating the intra and inter-day precisions with relative standard deviations (RSDs) less than 6.7 and 9.9%, respectively.