Importance of quinolizidine alkaloids in the relationship between larvae ofUresiphita reversalis (Lepidoptera: Pyralidae) and a host plant,Genista monspessulana

1990 ◽  
Vol 16 (6) ◽  
pp. 1853-1865 ◽  
Author(s):  
C. B. Montllor ◽  
E. A. Bernays ◽  
R. V. Barbehenn
Keyword(s):  
Host Plant ◽  
Quinolizidine Alkaloids ◽  
Genista Monspessulana ◽  
Lepidoptera Pyralidae ◽  
The Relationship

Uresiphita reversalis (Lepidoptera: Pyralidae): Carrier-Mediated Uptake and Sequestration of Quinolizidine Alkaloids Obtained from the Host Plant Teline monspessulana

1991 ◽  
Vol 46 (11-12) ◽  
pp. 1080-1088 ◽  
Author(s):  
Michael Wink ◽  
Clytia B. Montllor ◽  
Elizabeth A. Bernays ◽  
Ludger Witte
Keyword(s):  
Host Plant ◽  
Minor Component ◽  
Quinolizidine Alkaloids ◽  
Simple Diffusion ◽  
Carrier Mechanism ◽  
Silk Glands ◽  
Lepidoptera Pyralidae ◽  
Capillary Glc ◽  
Uresiphita Reversalis

Larvae of Uresiphita reversalis feed almost exclusively on legumes of the tribe Genisteae, whose characteristic secondary metabolites are quinolizidine alkaloids (QA). Aposematic larvae store host plant-derived QA in their integument, while the pupae are almost alkaloid-free. In the last instar larvae, alkaloids were concentrated in the larval head, possibly in the silk glands. About 80% of the alkaloids were transferred to the cocoon silk and 19% were lost with larval exuviae.The larval alkaloid pattern was characterized by capillary GLC and GLC-MS and compared to that of the host plant, Teline monspessulana. Whereas the host plant contained mainly epiaphylline, dehydroaphylline and aphylline, larvae selectively accumulated N-methylcytisine, a relatively minor component of the plant QA; the faeces contained mainly epiaphylline and dehydroaphylline. Thus uptake and sequestration must be selective processes. Uptake by isolated larval midguts was time-, pH- and temperature-dependent and displayed an activation energy between 50 and 80 kJ/mol. Furthermore the in vitro uptake of 13-hydroxylupanine was competitively inhibited by cytisine. All these data provide evidence that QA uptake does not proceed by simple diffusion but instead with the aid of a carrier mechanism; this could explain the differential alkaloid uptake observed in living larvae.

The relationship among host plant species, egg clutch size, and level of parasitism for the sharpshooter Tapajosa rubromarginata

2020 ◽  
Vol 168 (12) ◽  
pp. 900-910
Author(s):  
Eduardo G. Virla ◽  
María B. Aguirre ◽  
Guido A. Van Nieuwenhove ◽  
Erica B. Luft Albarracin ◽  
Guillermo A. Logarzo
Keyword(s):  
Host Plant ◽  
Clutch Size ◽  
Plant Species ◽  
Host Plant Species ◽  
The Relationship
Sign in / Sign up

Export Citation Format

Share Document