caa a22 4500 477082637 CHVBK 20180405111454.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF01938882 doi (NATIONALLICENCE)springer-10.1007/BF01938882 Possible involvement of the phloem sealing system in the acceptance of a plant as host by an aphid [Elektronische Daten] [C. Caillaud, H. Niemeyer] Possible reasons for the rejection of some lines ofTriticum monococcum (Tm44 and Tm46) by the aphidSitobion avenae were explored. In allT. monococcum lines studied, whether unfavourable (non-host/resistant plant) or favourable (host/susceptible plant), the concentrations of hydroxamic acids, a family of aphid-resistance factors in cereals, were significantly lower than the levels in the favourable host-plantTriticum aestivum cv. Therefore, hydroxamic acids did not account for the host/non-host patterns observed. Phloem sap was collected by stylectomy from young seedlings of favourable and unfavourable plants. In non-aphid-resistant genotypes, the success in stylectomy, the proportion of amputated stylets resulting in long (>1 min) exudations, the average duration of exudation, and the final volume of sap exuded, were higher than in the aphid-resistant genotypes. It is concluded that aphid interference with the phloem sealing system of the plant is a likely mechanism of rejection ofT. monococcum lines Tm44 and Tm46 as hosts byS. avenae. Birkhäuser Verlag, 1996 Aphids ( Sitobion avenae ) nationallicence Triticum spp nationallicence phloem sap nationallicence secondary compounds (hydroxamic acids) nationallicence stylectomy nationallicence aphid-plant interactions nationallicence plant resistance nationallicence Caillaud C. Laboratoire INRA-ENSA de Zoologie, B.P. 29, F-33650, Le Rheu, (France) aut Niemeyer H. Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, (Chile) aut Experientia Birkhäuser-Verlag 52/9(1996-09-01), 927-931 0014-4754 52:9<927 1996 52 18 https://doi.org/10.1007/BF01938882 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01938882 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Caillaud C. Laboratoire INRA-ENSA de Zoologie, B.P. 29, F-33650, Le Rheu, (France) aut NATIONALLICENCE 700 1- Niemeyer H. Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, (Chile) aut NATIONALLICENCE 773 0- Experientia Birkhäuser-Verlag 52/9(1996-09-01), 927-931 0014-4754 52:9<927 1996 52 18 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer