Experientia

, Volume 52, Issue 9, pp 927–931 | Cite as

Possible involvement of the phloem sealing system in the acceptance of a plant as host by an aphid

  • C. M. Caillaud
  • H. M. Niemeyer
Research Articles

Abstract

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.

Key words

Aphids (Sitobion avenaeTriticum spp phloem sap secondary compounds (hydroxamic acids) stylectomy aphid-plant interactions plant resistance 

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Copyright information

© Birkhäuser Verlag 1996

Authors and Affiliations

  • C. M. Caillaud
    • 1
  • H. M. Niemeyer
    • 2
  1. 1.Laboratoire INRA-ENSA de ZoologieLe Rheu(France)
  2. 2.Departamento de Ciencias Ecológicas, Facultad de CienciasUniversidad de ChileSantiago(Chile)

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