[PMID]: | 27923986 |
[Au] Autor: | Lesniewska J; Öhman D; Krzeslowska M; Kushwah S; Barciszewska-Pacak M; Kleczkowski LA; Sundberg B; Moritz T; Mellerowicz EJ |
[Ad] Endereço: | Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, S901-83 Umeå, Sweden (J.L., D.Ö., M.K., S.K., M.B.-P., B.S., T.M., E.J.M.); and Department of Plant Physiology, Umeå Plant Science Center, Umeå University, S901-87 Umeå, Sweden |
[Ti] Título: | Defense Responses in Aspen with Altered Pectin Methylesterase Activity Reveal the Hormonal Inducers of Tyloses. |
[So] Source: | Plant Physiol;173(2):1409-1419, 2017 Feb. |
[Is] ISSN: | 1532-2548 |
[Cp] País de publicação: | United States |
[La] Idioma: | eng |
[Ab] Resumo: | Tyloses are ingrowths of parenchyma cells into the lumen of embolized xylem vessels, thereby protecting the remaining xylem from pathogens. They are found in heartwood, sapwood, and in abscission zones and can be induced by various stresses, but their molecular triggers are unknown. Here, we report that down-regulation of PECTIN METHYLESTERASE1 (PtxtPME1) in aspen (Populus tremula × tremuloides) triggers the formation of tyloses and activation of oxidative stress. We tested whether any of the oxidative stress-related hormones could induce tyloses in intact plantlets grown in sterile culture. Jasmonates, including jasmonic acid (JA) and methyl jasmonate, induced the formation of tyloses, whereas treatments with salicylic acid (SA) and 1-aminocyclopropane-1-carboxylic acid (ACC) were ineffective. SA abolished the induction of tyloses by JA, whereas ACC was synergistic with JA. The ability of ACC to stimulate tyloses formation when combined with JA depended on ethylene (ET) signaling, as shown by a decrease in the response in ET-insensitive plants. Measurements of internal ACC and JA concentrations in wild-type and ET-insensitive plants treated simultaneously with these two compounds indicated that ACC and JA regulate each other's concentration in an ET-dependent manner. The findings indicate that jasmonates acting synergistically with ethylene are the key molecular triggers of tyloses. |
[Mh] Termos MeSH primário: |
Hidrolases de Éster Carboxílico/metabolismo Celulose/análogos & derivados Populus/fisiologia
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[Mh] Termos MeSH secundário: |
Aminoácidos Cíclicos/metabolismo Aminoácidos Cíclicos/farmacologia Hidrolases de Éster Carboxílico/genética Celulose/metabolismo Ciclopentanos/metabolismo Etilenos/metabolismo Peróxido de Hidrogênio/metabolismo Oxilipinas/metabolismo Folhas de Planta/metabolismo Proteínas de Plantas/genética Proteínas de Plantas/metabolismo Plantas Geneticamente Modificadas Populus/efeitos dos fármacos Populus/genética Ácido Salicílico/metabolismo
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[Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (Amino Acids, Cyclic); 0 (Cyclopentanes); 0 (Ethylenes); 0 (Oxylipins); 0 (Plant Proteins); 0 (Tyloses); 3K9EJ633GL (1-aminocyclopropane-1-carboxylic acid); 6RI5N05OWW (jasmonic acid); 9004-34-6 (Cellulose); 91GW059KN7 (ethylene); BBX060AN9V (Hydrogen Peroxide); EC 3.1.1.- (Carboxylic Ester Hydrolases); EC 3.1.1.11 (pectinesterase); O414PZ4LPZ (Salicylic Acid) |
[Em] Mês de entrada: | 1710 |
[Cu] Atualização por classe: | 171003 |
[Lr] Data última revisão:
| 171003 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 161208 |
[St] Status: | MEDLINE |
[do] DOI: | 10.1104/pp.16.01443 |
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