Induction of defense in apples by sulfated and deacetylated chichá gum

Polimeros,Ciencia e Tecnologia

article

Carlos Pinheiro Chagas de Lima¹  Andréia Hansen Oster²  Fábio Rossi Cavalcanti²  Regina Célia Monteiro de Paula¹  Judith Pessoa Andrade Feitosa¹ 

[1] Laboratório de Polímeros - LabPol, Departamento de Química Orgânica e Inorgânica - DQOI, Universidade Federal do Ceará - UFC;Empresa Brasileira de Pesquisa Agropecuária - Embrapa Uva e Vinho

关键词: benzothiadiazole (BTH);    Sterculia striata;    elicitor;    polysaccharide;    sulfation;   

DOI  :  10.1590/0104-1428.08820

来源: Brazilian Academy Of Neurology

【 摘 要 】

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.

【 授权许可】

Unknown