Berta Estela Juárez

FLAVONOID PATTERNS OF SOME BARNADESIOIDEAE (ASTERACEAE). EVENTUAL CHEMOSYSTEMATIC SIGNIFICANCE

H ieron. All species grow exclusively in the Andean region from Colombia to south of Argentina and Brazil. Plant material was collected in nature or from her- barium specimens. A voucher of each specimen is deposited at the Herbarium of the Fundacibn Miguel Lillo. The voucher numbers are:

Flavonoid chemistry of Chuquiraga (Asteraceae)

Fresh plant material was collected in different Argentine provinces. A voucher of each specimen is deposited at the Herbarium of the Fundacion Miguel Lillo (LIL). Chuquiraga atacamensis Kuntze collected in SALTA: Dept. Los Andes (LIL 603627); C. parviflora (Griseb.) Hieron. collected in CATAMARCA, Dept. Andalgala (LIL 605897); C. straminea Sandwith collected in NEUQUEN, Dept. CollanCura (LIL 605812).

Flavonoid profiles of some Argentine species of Chuquiraga (Asteraceae)

Chuquiraga avellanedae Lorentz; C. erinacea D. Don; C. erinacea subsp. hystrix (D. Don) C. Ezcurra; C. incana D. Don; C. oppositifolia Don; C. rosulata Gaspar were collected in Mendoza Province, Argentina. A voucher of each specimen is deposited at the Herbarium Ruiz Leal. The voucher numbers are: Chuquiraga avellanedae (MERL 21454); C. erinacea (MERL 11049); C. erinacea subsp. hystrix (MERL 11123); C. incana (MERL 19012); C. oppositifolia (MERL 30473); C. rosulata (MERL 21449).

Insecticidal Activity of the Essential Oil and Extracts of Gutierrezia mandonii and G. repens (Asteraceae) Growing in Argentina

Abstract The insecticidal activities of essential oils (EO), the remaining water phase (RW) from the hydrodistillation, and the dichloromethane and methanolic extracts from Gutierrezia repens Griseb. and Gutierrezia mandonii (Sch. Bip.) Solbrig were evaluated. The GC and GC/MS analyses of the oils resulted in the identification of 52 compounds from G. mandonii and 17 compounds from G. repens comprising 88.7% and 98.5% of the oils, respectively. Sabi- nene (0–13.1%), β-pinene (6.4–17.8%) limonene (0.7–13.3%), (E)-β-ocimene (1.3–7.0%), terpinen-4-ol (0.7–4.1%), spathulenol (0–4.1%) and, the isomers (6R,7R)-bisabolone (6.6–58.0%) and (6S,7R)-bisabolone (0–1.6%) were the main components of the oils. Mortality and development delays of Ceratitis capitata larvae, reared using a treated artificial diet, were recorded. Gutierrezia mandonii methanolic extracts and the oil produced lethal effects (p≤0.05). Methanolic and dichloromethane extracts, the oil and the remaining water from distillation (RW) produced sublethal effects. Meanwhile dichloromethane and methanolic extracts, the oil and RW from G. repens resulted in significant mortality (p≤0.05), and all causing also significant development delays. The required concentration of G. repens oil to avoid development in 50% of C. capitata larvae (EC50) was significantly lower than G. mandonii

Flavonoids of Doniophyton patagonicum (Phil.) Hieron. (Asteraceae)

Doniophyton patagonicum (Phil.) Hieron. is a small shrub, 20–30 cm high, with axillar spines, abundant yellow capitula and a plumose pappus shorter than the corolla. It grows in the biogeographic Patagonic Province (Neuquen, Rio Negro, Chubut, Santa Cruz) reaching Mendoza, San Juan, La Pampa and Mendoza (Urtubey, 1996). This plant material was collected in Mendoza and a voucher specimen is deposited at the Herbarium Ruiz Leal (MERL 7464).