2005/04/21 by Martin Heil, Janine Rattke, Wilhelm Boland · 2 citations
Biochemistry, Genetics and Molecular Biology · Agricultural and Biological Sciences · #Insect and Arachnid Ecology and Behavior #Plant and animal studies #Plant Parasitism and Resistance #Nectar #Mutualism (biology) #Obligate #Biology #Myrmecophyte #Acacia #Botany #Sucrose #Pollen #Biochemistry
paper · doi:10.1126/science.1107536
openalex publication_date 2005/04/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Obligate Acacia ant plants house mutualistic ants as a defense mechanism and provide them with extrafloral nectar (EFN). Ant/plant mutualisms are widespread, but little is known about the biochemical basis of their species specificity. Despite its importance in these and other plant/animal interactions, little attention has been paid to the control of the chemical composition of nectar. We found high invertase (sucrose-cleaving) activity in Acacia EFN, which thus contained no sucrose. Sucrose, a disaccharide common in other EFNs, usually attracts nonsymbiotic ants. The EFN of the ant acacias was therefore unattractive to such ants. The Pseudomyrmex ants that are specialized to live on Acacia had almost no invertase activity in their digestive tracts and preferred sucrose-free EFN. Our results demonstrate postsecretory regulation of the carbohydrate composition of nectar.