Alkaloids from endophyte-infected Festuca argentina

Area of Science:

• * Phytochemistry
• * Plant Pathology
• * Mycology

Background:

• * Festuca argentina, a pooid-grass, hosts endophytes.
• * Loline-type alkaloids are known secondary metabolites in grasses.
• * Understanding these alkaloids' roles is crucial for plant defense and ecology.

Purpose of the Study:

• * To characterize loline-type alkaloids in Festuca argentina.
• * To evaluate the toxicity of these alkaloids in a mammalian model.
• * To discuss their potential phytoalexine role and chemotaxonomical significance.

Main Methods:

• * Isolation and characterization of five loline-type alkaloids.
• * Intraperitoneal injection of alkaloids into mice to assess toxicity.
• * Phytochemical analysis and literature review for chemotaxonomical significance.

Main Results:

• * Five loline-type alkaloids were identified: lolinine, N-formylloline, loline, N-methylloline, and the novel 5,6-dehydro-N-acetylloline.
• * Intraperitoneal administration of these alkaloids did not induce toxicity in mice.
• * The identified alkaloids are unlikely to be the primary cause of plant toxicity.

Conclusions:

• * The characterized loline alkaloids from Festuca argentina are non-toxic to mice.
• * Their role as phytoalexins in plant defense warrants further investigation.
• * These findings contribute to the chemotaxonomical understanding of endophyte-infected grasses.