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ARS Home » Pacific West Area » Salinas, California » Crop Improvement and Protection Research » Research » Publications at this Location » Publication #362552

Research Project: Genetics and Breeding of Lettuce, Spinach, Melon, and Related Species to Improve Production and Consumer-related Traits

Location: Crop Improvement and Protection Research

Title: Lettuce genetics of lettuce drop and Verticillium wilt resistance

item Hayes, Ryan
item Simko, Ivan

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 3/27/2019
Publication Date: 3/27/2019
Citation: Mamo, B., Hayes, R.J., Simko, I., Subbarao, K.V. 2019. Lettuce genetics of lettuce drop and Verticillium wilt resistance. Soilborne Plant Pathogens Conference, March 26-28, 2019, San Marino, CA.

Interpretive Summary:

Technical Abstract: Lettuce production is constrained by numerous biotic and abiotic factors. Lettuce drop and Verticillium wilt are among the common production challenges in the Salinas Valley of California; both caused by fungal pathogens. The adverse effects of these diseases on lettuce could be mitigated by application of fungicides and through cultural practices. These approaches, however, do not always reduce diseases to the levels that are needed to avoid substantial economic losses. The use of genetic resistance provides affordable and sustainable means of disease management. Identifying and characterizing the inheritance of resistance is a pre-requisite for resistance breeding. Complete resistance to lettuce drop has not been observed in lettuce, while partial resistance is frequently associated with early bolting that is commercially undesirable. The slow-bolting cultivar Eruption is highly resistant to lettuce drop and completely resistant to Verticillium wilt, race 1. The rapid-bolting accession PI 251246 also has partial resistance to lettuce drop, but this resistance is associated with plant architecture. This work summarizes latest results on the genetics of resistance of lettuce to lettuce drop and Verticillium wilt in cultivar Eruption and PI 251246.