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Studies on infection of bean (Phaseolus vulgaris) and soybean (Glycine max) by ascospores of Sclerotinia sclerotiarum
Author(s) -
SUTTON D. C.,
DEVERALL B. J.
Publication year - 1983
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1983.tb02832.x
Subject(s) - biology , sclerotinia sclerotiorum , phaseolus , spore , ascospore , germination , hypha , mycelium , botany , germ tube , sclerotinia , spore germination , fungus , ascocarp , host (biology) , inoculation , microbiology and biotechnology , horticulture , taxonomy (biology) , ecology
Factors influencing the infection of bean and soybean by ascospores of Sderotinia sclerotiorum were studied. In the absence of an exogenous nutrient source, ascospores on intact host tissues produced a short and usually sub‐polar germ‐tube but only young host tissues were penetrated by the infection hypha arising from the germinated spore. There was a hypersensitive response by cells to penetration and generally the fungus remained restricted to these cells, though it continued to grow within them. Water‐soaked lesions characteristic of successful infections only developed when many individual infection sites coalesced following inoculation with high concentrations of ascospores. Flowers or parts of flowers provided a suitable nutrient base for initial colonization from ascospore inoculum. Mycelium extending from this base initiated infection of intact host surfaces. Pollen stimulated growth from germinating ascospores in vitro and in vivo but did not stimulate infection of bean.