Primary haustorial development of Striga asiatica on host and nonhost species

Initial interactions of Striga asiatica with a susceptible host and nonhost plants were examined by histological methods. Haustorial development was initiated when radicles of S. asiatica were placed in contact with host or nonhost roots. Reorganization of the S. asiatica root apical meristem was ra...

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Bibliographic Details
Published in:Phytopathology 1998-01, Vol.88 (1), p.70-75
Main Authors: Hood, M.E. (Duke University, Durham, NC.), Condon, J.M, Timko, M.P, Riopel, J.L
Format: Article
Language:English
Subjects:
ABELMOSCHUS ESCULENTUS
ANATOMIA DE LA PLANTA
ANATOMIE VEGETALE
Biological and medical sciences
BIOLOGICAL DEVELOPMENT
CELL STRUCTURE
DESARROLLO BIOLOGICO
DEVELOPMENTAL STAGES
DEVELOPPEMENT BIOLOGIQUE
ESTRUCTURA CELULAR
ETAPAS DE DESARROLLO
Fundamental and applied biological sciences. Psychology
HIBISCUS ABELMOSCHUS
HISTOLOGY
HOST PARASITE RELATIONS
INFECTIVITY
LACTUCA SATIVA
LINUM USITATISSIMUM
NICOTIANA TABACUM
ONTOGENY
Parasitic plants
Parasitic plants. Weeds
PATHOGENICITY
PATOGENICIDAD
Phytopathology. Animal pests. Plant and forest protection
PLANT ANATOMY
POUVOIR PATHOGENE
RACINE
RAICES
RELACIONES HUESPED PARASITO
RELATION HOTE PARASITE
RICINUS COMMUNIS
ROOTS
SORGHUM BICOLOR
STADE DE DEVELOPPEMENT
STRIGA ASIATICA
STRUCTURE CELLULAIRE
TAGETES
TAGETES ERECTA
ULTRAESTRUCTURA
ULTRASTRUCTURE
VIGNA RADIATA
VIGNA UNGUICULATA
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Summary:Initial interactions of Striga asiatica with a susceptible host and nonhost plants were examined by histological methods. Haustorial development was initiated when radicles of S. asiatica were placed in contact with host or nonhost roots. Reorganization of the S. asiatica root apical meristem was rapid and involved the formation of a distal group of cells that penetrated the host or nonhost root. Penetration of the epidermis of the host (sorghum) roots and advance into the cortex occurred within 24 to 48 h of inoculation. Penetration of the endodermis by the developing endophyte was delayed for 72 to 96 h after initial contact. However, upon penetration vascular continuity was established between parasite and host. In contrast, interactions with nonhosts provided evidence of active resistance mechanisms. Penetration of lettuce, marigold, and cowpea roots by S. asiatica was most frequently arrested in the cortex, and endophytic cells were necrotic 72 h after inoculation. Some species-specific differences were observed in the reactions of nonhosts to penetration, although in their general nature the interactions with S. asiatica were similar
ISSN:0031-949X
1943-7684
DOI:10.1094/phyto.1998.88.1.70