Evaluation of herbicidal potential of depsides from Cladosporium uredinicola, an endophytic fungus found in Guava fruit

Journal of the Brazilian Chemical Society

Veiga, Thiago André M.¹  Universidade Federal de São Carlos, São Carlos, Brazil¹  Medeiros, Lívia S. de¹  Universidade Federal de São Paulo, Diadema, Brazil¹  Sampaio, Olívia M.¹  Rodrigues Filho, Edson¹  Silva, Maria Fátima das G. F. da¹ 

关键词: endophyte;    Cladosporium;    depsides;    Hill reaction inhibitors;    photosystem II;   

DOI  :  10.1590/S0103-50532012005000018

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Two natural products produced by Cladosporium uredinicola, an endophytic fungus isolated from guava fruit, were evaluated for their effects on photosynthesis. Both of them inhibited electron flow (basal, phosphorylating, and uncoupled) from water to methylviologen (MV), acting as Hill reaction inhibitors in freshly lysed spinach thylakoids. These polyketides, belonging to depsides class, inhibited partial reactions of photosystem II (PS II) electron flow from water to 2,5-dichloro-1,4-benzoquinone (DCBQ), from water to sodium silicomolybdate (SiMo Na+), and partially inhibited electron flow from 1,5-diphenylcarbazide (DPC) to 2,6-dichloroindophenol (DCPIP). These results established that the depsides sites of inhibition are located on the donor and acceptor sides of PS II, between P680 and QA. Chlorophyll a fluorescence measurements corroborated this mechanism of action. None of the tested compounds inhibited photosystem I (PS I) electron transport.

【 授权许可】

Unknown