A Comparative Study of the Haustorial Development of Striga asiatica (L.) Kuntze on Sorghum Cultivars

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Abstract
Ten sorghum cultivars were studied for their mode of Striga parasitization, and the factors conferring resistance in resistant cultivars most of the Striga haustona failed to penetrate beyond the endodermis, whereas in susceptible cultivars the haustona penetrated the endodermis and became established Resistant cultivars showed marked endodermal and pencyclic thickening and the deposition of silica in their endodermal cells, which were lacking in the susceptible cultivars Extra thickening in pencyclic cells as a response to the entrance of haustonum was observed in cultivars N-13 and IS-4202 Ten cultivars studied showed differential haustorial reactions These reactions included extra thickening in the pericycle in response to haustonal infestation, haustonal collapse, tylosts-like occlusions in the xylem vessels, and the deposition of dark-staining materials in the cortex Although no definite conclusion could be drawn regarding the relationship between the degree of mechanical tissue development and field resistance, there was evidence that some field-resistant cultivars have strong mechanical tissues There could, however, be other factors governing resistance to Striga in the field

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