Open AccessGenomic localization of tomato genes that control a hypersensitive reaction to Xanthomonas campestris pv. vesicatoria (Doidge) dye.
Author(s) -
Zheping Yu,
J F Wang,
Robert E. Stall,
C. Eduardo Vallejos
Publication year - 1995
Publication title -
genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.792
H-Index - 246
eISSN - 1943-2631
pISSN - 0016-6731
DOI - 10.1093/genetics/141.2.675
Subject(s) - biology , xanthomonas campestris , hypersensitive response , genetics , backcrossing , population , chromosome , gene , lycopersicon , genetic linkage , inoculation , microbiology and biotechnology , plant disease resistance , botany , horticulture , demography , sociology
Xanthomonas campestris pv. vesicatoria causes bacterial spot, one of the most serious diseases of tomatoes. The lycopersicon esculentum accession 'Hawaii 7998' is the only reliable source of resistance to race 1 strains of the pathogen. This resistance is associated with a hypersensitive reaction controlled by multiple nondominant genes. The inoculated area becomes fully necrotic 24 hr after inoculation in 'Hawaii 7998,' whereas full necrosis is observed 5 and 4 days after inoculation in the susceptible species L. pennellii (LA 716) and their F1, respectively. An interspecific backcross population, using 'Hawaii 7998' as the recurrent parent, was analyzed to determine the linkage relationships between the resistance genes and 135 molecular marker loci. The range of responses of the BC1 population included those of the parents. Linkage to a hypersensitive response factor was assessed by comparing the rates of necrosis development between homozygous and heterozygous plants at 8 hr-intervals. Three factors that affect the hypersensitive response of 'Hawaii 7998' were detected. One factor is on the short arm of chromosome I, another on the long arm of chromosome I, and a third on the long arm of chromosome 5. These factors appeared to act independently and to have additive effects.