Título:	Induction of defense in apples by sulfated and deacetylated chichá gum.
Autor:	LIMA, C. P. C. de OSTER, A. H. CAVALCANTI, F. R. PAULA, R. C. M. de FEITOSA, J. P. A.
Afiliación:	CARLOS PINHEIRO CHAGAS DE LIMA, Laboratório de Polímeros - LabPol, Departamento de Química Orgânica e Inorgânica - DQOI, Universidade Federal do Ceará - UFC, Fortaleza, CE, Brasil; ANDREIA HANSEN OSTER, CNPUV; FABIO ROSSI CAVALCANTI, CNPUV; REGINA CÉLIA MONTEIRO DE PAULA, Laboratório de Polímeros - LabPol, Departamento de Química Orgânica e Inorgânica - DQOI, Universidade Federal do Ceará - UFC, Fortaleza, CE, Brasil; JUDITH PESSOA ANDRADE FEITOSA, Laboratório de Polímeros - LabPol, Departamento de Química Orgânica e Inorgânica - DQOI, Universidade Federal do Ceará - UFC, Fortaleza, CE, Brasil.
Año:	2021
Referencia:	Polímeros, v. 31, n. 1, e2021010, p. 1-8, julho 2021.
Descripción:	Elicitors activate the defense mechanism in plants to resist pathogens. Ulvans and glucuronans can act as elicitors, and their activity seems to be related to the sulfate groups, rhamnose and uronic acid monosaccharides. Chichá gum (CHG), which also contains rhamnose and uronic acid, was sulfated with chlorosulfonic acid/N,N-dimethylformamide and deacetylated with sodium hydroxide solution. The changes were confirmed by infrared spectroscopy. Carbon-13 NMR revealed that sulfation occurred in galactose and rhamnose units. The apples were sprayed with water (negative control), deacetylated chichá gum (DCHG), and sulfated chichá gum (SCHG). The activity of enzymes guaiacol peroxidase and polyphenol oxidases and the lignin content were compared with those under the action of a commercial elicitor, benzothiadiazole. DCHG, and especially SCHG, increased the activity of the two enzymes. Only fruits treated with SCHG showed a significant (p<0.05) increase in lignin content. The plant exudate can be one abundant, renewable and safe source of elicitors. Keywords: benzothiadiazole (BTH), Sterculia striata, elicitor, polysaccharide, sulfation.
NAL Thesaurus:	Sterculia striata
Palabras clave:	Benzothiadiazole (BTH) Elicitor Polysaccharide Sulfation
DOI:	https://doi.org/10.1590/0104-1428.08820
Tipo de Material:	Artigo de periódico
Acceso:	openAccess
Aparece en las colecciones:	Artigo em periódico indexado (CNPUV)