Settling behaviour of Rhopalosiphum padi (L.) in relation to cyanogenic glycosides and gramine contents in barley

Citation
K. Forslund et al., Settling behaviour of Rhopalosiphum padi (L.) in relation to cyanogenic glycosides and gramine contents in barley, ACT AG SC B, 48(2), 1998, pp. 107-112
Citations number
29
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Agriculture/Agronomy
Journal title
ACTA AGRICULTURAE SCANDINAVICA SECTION B-SOIL AND PLANT SCIENCE
ISSN journal
0906-4710 → ACNP
Volume
48
Issue
2
Year of publication
1998
Pages
107 - 112
Database
ISI
SICI code
0906-4710(199806)48:2<107:SBORP(>2.0.ZU;2-Y
Abstract
In order to examine whether the content of cyanogenic glycosides or gramine in barley affects the host plant preference of the aphid Rhopalosiphum pad i (L.) two-choice settling tests were performed with R. padi on different b arley varieties with varying amounts of these compounds. The total concentr ation of cyanogenic glycosides in barley shoots, as determined in 59 variet ies, varied between 20 and 1200 nmol (g fw)(-1). Of the 59 varieties, sis w ith high [ > 700 nmol (g fw)(-1)], six with intermediate [450-650 nmol (g f w)(-1)] and six with low [<200 nmol (g fw)(-1)] content of cyanogenic glyco sides were chosen for preference tests with R. padi. The content of gramine was determined in these 18 chosen varieties and was generally either low ( close to 0) or high [about 2 mu mol (g fw)(-1)]. There was no correlation b etween cyanogenic glycoside and gramine content. The aphids did not discrim inate between varieties with high, intermediate or low content of cyanogeni c glycosides in combinations with high or low gramine content. The results indicate that the concentration of neither of these compounds affected the settling preference of R. padi.