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Annals of Botany 81: 431-440, 1998
© 1998 Annals of Botany Company

Striga gesnerioidesParasitising Cowpea: Development of Infection Structures and Mechanisms of Penetration

G. C. REISS+, and J. A. BAILEY

IACR-Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, Bristol, BS18 9AF, UK

August 15, 1997 ; October 29, 1997 . November 20, 1997 .

Striga gesnerioides(Scrophulariaceae) is an obligate hemiparasitic angiosperm, that infects the roots of cowpea (Vigna unguiculata). The development ofStrigaseedlings was characterized after transfer to the surface of cowpea roots using cryo-scanning electron microscopy. Contact with the surface of the root caused distinct morphological changes in theStrigaradicles. Radicle elongation ceased 8 h after contact with host roots and radicle hairs developed. These hairs adhered to the surface of the host root. Early stages of root penetration, i.e. prior to connection to the host vascular system were examined by light microscopy and transmission electron microscopy to determine the mechanisms by whichStrigainvades root tissue. Cowpea roots were penetrated byS. gesnerioidesradicles after 48 h. Host cells immediately surrounding the invadingStrigawere compressed, but other host cells were not affected. Immunocytochemistry, using monoclonal antibodies JIM 5 and JIM 7, showed thatStrigaadvanced intercellularly through the root tissues without extensive removal of pectins at the site of penetration.Copyright 1998 Annals of Botany Company

Striga gesnerioides,Vigna unguiculata, mechanisms of penetration, host-parasite interactions, electron microscopy, immunocytochemistry.


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