Pathogenicity of race-1 and race-2 tomato wilt isolates of Verticillium dahliae to four solanaceous and two non-solanaceous hosts
1994
Mingochi, D.S. (Bath Univ. (United Kingdom). School of Biological Sciences) | Clarkson, J.M.
The pathogenicity of four race-1 and three race-2 tomato wilt isolates of Verticillium dahliae to tomato, eggplant, tobacco, pepper, French bean and cabbage was investigated. Plants were inoculated without wounding and the symptoms assessed 6 weeks later. Both race-1 and race-2 isolates caused foliar symptoms on the race-1 susceptible tomato cultivar GCR-26 (Ve/Ve) altough these were generally more severe with race-1. All race-2 isolates were significantly more pathogenic than race-1 on the race-1 resistant tomato cultivar GCR-218 (ve/ve), although two of the race-1 isolates caused mild foliar symptoms. None of the race-2 isolates caused stunting of GCR-26 whereas they all caused significant stunting of GCR-218. All isolates reduced dry weight on GCR-26 whereas only race-2 affected GCR-128. All isolates reduced dry weight on GCR-26 whereas only race-2 affected GCR-218. All isolates induced significant foliar symptoms, stunting and reduction in dry weight on eggplant. Only one isolate (race-1) caused foliar symptoms on tobacco but this was not accompanied by a reduction in either plant height or dry weight. All isolates were able to cause foliar symptoms on pepper, and two caused moderate to severe symptoms. Four isolates caused a significant reduction in plant height and one of these reduced dry weight. One isolate which caused mild foliar symptoms on pepper increased host dry weight. No disease symptoms were observed on the non-solanaceous host French bean. All isolates were capable of inducing mild foliar symptoms on cabbage but none caused reductions in either plant height or dry weight. Race-1 and race-2 isolates could only be distinguished on the near-isogenic pair of tomato cultivars
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