Anatomy, histochemistry, and comparative analysis of hydroxycinnamic derivatives in healthy leaves and galls induced by Baccharopelma spp. (Hemiptera: Psyllidae) in Baccharis spicata (Lam) Baill (Asteraceae)

COGOI LAURA; WAGNER MARCELO; AGUDELO IGNACIO; KUZMANICH NICOLÁS; FILIP ROSANA; RICCO RAFAEL

BIOCHEMICAL SYSTEMATICS AND ECOLOGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2018 vol. 74 p. 22 - 30

0305-1978

Baccharis spicata is a plant native to the south of South America And is infected by psyllids of theBaccharopelma genus, which induce a fold gall in its leaves. This infection induces a series of anatomicaland phytochemical variations compared to the healthy leaf: the content of total phenolic compounds andtotal hidroxycinnamic derivatives is lower, though the chlorogenic acid measured by HPLC remains thesame and the 4,5 dichlorogenic acid content is near the half of the one observed in the one in the healthyleaf. Regarding to its anatomy, the gall has an homogeneous mesophyll and flavonoids in its outerepidermis compared to an isobilateral mesophyll and epidermal flavonoidic idioblasts observed in theleaf. The increase in the expression of waxes suggests it is a protective function against the desiccation bypreventing water evaporation in the structure. The results here exposed suggest that the psyllid manipulatesplant tissues, inducing hyperplasia and hypertrophy in the tissues, differentiating them fromhealthy structures and inducing changes in the biosynthesis of secondary polyphenolic metabolites thatact like intermediary between the gall and the environment.