Inheritance of Resistance to Corynebacterium michiganense in Tomato

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Abstract
Parent clones, 1st and 2nd filial generations and backcross generations from 6 tomato crosses were tested for resistance to C. michiganense. Three sources of resistance used in the crosses were Lycopersicon esculentum (''Bulgaria 12'', P.I. 330727) and L. pimpinellifolium (''Utah 737'', P.I. 344103, and ''Utah 20'', P.I. 344102). Seedling tomatoes were inoculated in the 3-leaf stage and evaluated 5 wk later, by measurement of internal vascular discoloration. Resistance appears to be controlled by several quantitative or incompletely dominant major genes that are influenced by modifying genes.

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