Fruchtresistenz von Tomaten gegen P. infestans
2009
Butz, Andreas F. | Finckh, Maria R.
Resistance of tomato fruits to Phytophthora infestans Late blight, caused by Phytophthora infestans (Mont) de Bary, is one of the important diseases in organic potato and tomato production. While some information on foliar disease resistance of tomatoes is available, virtually no information exists on the relation of leaf to fruit resistance. The central parameters of the infection chain, incubation and latency period were determined for 40 tomato varieties using three isolates of P. infestans. A total of 2858 fruits were drop inoculated in the lab and assessed daily for symptoms or sporulation for 16 days. There were significant variety by isolate interactions for incubation period, latency period and the interim time suggesting race specific interactions with tomato fruits. A Manteltest showed that the distance matrix of the isolate x variety interaction of leaf and fruit reactions were not correlated. Thus, it appears that fruit and leaf resistance are independent characters.
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