Reference Report for stem_ref6
| Title: | The Diaporthe Phaseolorum complex of soybean |
| Authors: | Morgan-Jones, G. |
| Source: | Fitopatol. Brasil. 1992, 17(4):359-367 |
| Abstract: | The taxonomic status and nomenclature of fungi implicated in soybean stem canker and seed biodeterioration is reviewed. Because of considerable variability in morphology, physiology and host relationships, classification at varietal level is considered to be unsatisfactory. Diaporthe phaseolorum and Phomopsis phaseoli are recognized, respectively, as the valid binomials for teleomorphs and anamorphs belonging to this complex. Synonyms and homonyms of these names are noted. Phomopsis longicolla, a fungus associated with seed biodeterioration, is accepted as a separate entity. The forma specialis concept is adopted for infraspecific designation. Forms originally named vars caulivora and sojae are referred to as f. sp. caulivora and f. sp. sojae. On the basis of differences in colony appearance, stromatal size and occurrence, perithecium morphology, production and arrangement, conidiomata formation, ascospore size and shape, temperature/growth relationships and symptom development, populations of D. phaseolorum causing stem canker are given separate status and named f. sp. meridionalis. This is described and its characteristics compared with those of f. sp. caulivora. It has been concluded that differing selection pressures, possibly including exposure to different soybean cultivars and varying climatic conditions, have resulted in the emergence and predominance of f. sp. meridionalis in the southeastern United States, where it has been exceptionaly destructive of the soybean plant. Recent investigations have, however, revealed considerable variability among monoascosporic isolates both in terms of in vitro growth rate and degree of pathogenicity |
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