Inheritance of Tolerance to Rhizoctonia Fruit Rot of Tomato1

in Journal of the American Society for Horticultural Science
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  • 1 Department of Horticultural Science, North Carolina State University, Raleigh, NC 27650


The inheritance of tolerance to rhizoctonia fruit rot incited by Rhizoctonia solani Kuhn differed depending upon the source of the plant material of tomato (Lycopersicon esculentum Mill.). The tolerance in USDA 75B 846-1-1 was controlled by 1 major gene without dominance. The tolerance in USDA 75B 610-3 was polygenic with 4 major genes. Tolerance in USDA 75B 846-1-1 had a narrow-sense heritability of 71% while in USDA 75B 610-3 heritability was 30%. Fruit rot tolerance and resistance to puncture pressure were highly correlated in both families. Fruit shape and fruit rot tolerance were also highly correlated in the family with USDA75B 846-1-1.

Contributor Notes

Received for publication January 13, 1979. Paper No. 5801 of the Journal Series of the North Carolina Agricultural Experiment Station. Use of tradenames does not imply endorsement by the North Carolina Agricultural Experiment Station of the products named or criticism of similar products not mentioned.

The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.

The technical assistance of Mr. Kenneth Butler is gratefully acknowledged. Appreciation is expressed to S. F. Jenkins, Jr., N. C. State University and T. H. Barksdale, Agric. Res. Center, Beltsville, MD for their assistance.

Graduate Research Assistant, Extension Associate Professor, Associate Professor, Department of Horticultural Science, respectively. Present address of senior author: 111 Sheridan Ave., Deal Park, NJ 07723.