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Breeding tomatoes for resistance to tomato yellow leaf curl begomovirus
Author(s) -
Lapidot M.,
Goldray O.,
BenJoseph R.,
Cohen S.,
Friedmann M.,
Shlomo A.,
Nahon S.,
Chen L.,
Pilowsky M.
Publication year - 2000
Publication title -
eppo bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.327
H-Index - 36
eISSN - 1365-2338
pISSN - 0250-8052
DOI - 10.1111/j.1365-2338.2000.tb00902.x
Subject(s) - begomovirus , leaf curl , biology , resistance (ecology) , horticulture , botany , plant virus , agronomy , virology , virus
Tomato yellow leaf curl begomovirus (TYLCV) can be devastating to tomato crops in tropical and subtropical regions. The development of resistant cultivars is the best option for the control of TYLCV. The TYLCV‐resistance level of a new breeding line, TY172, alongside that of commercial cultivars known to be resistant to the virus, was evaluated in a field test by comparing the yield performance of inoculated plants with that of uninoculated plants of the same line or cultivar. There were substantial differences among the different entries tested in the extent of yield loss relative to the corresponding uninoculated control plants. This comparison between inoculated and uninoculated plants of the same entry provides a quantitative assay for resistance level. All resistant commercial cultivars tested developed different levels of disease symptoms. Only line TY172 showed no symptoms of the disease. A low level of viral DNA was detected in infected TY172, showing that it is a symptomless carrier of TYLCV. When TY172 was crossed with susceptible lines, the hybrids exhibited milder symptoms than the susceptible parent, yet higher than that of TY172, suggesting a partial dominance for TY172 resistance. Upon inoculation of F 2 populations, the amount of symptomless individuals appeared in a ratio approximating 7:64. This suggests that at least three genes appear to account for the resistance.