Study on resistance of tomato to cladosporiosis under conditions of Eastern Siberia

Abstract

Results are given from a study on resistance of tomato test varieties and a number of widely used tomato hybrids to local races of cladosporiosis causative agents (Cladosporium fulvum Cooke). The following hybrids bred home and abroad were tested: Ulisse (Syngenta Co); Bella Rosa, Diabolic (Sakata vegetables); Jaguar (Seminis); hybrids of Gavrish Co, as well as hybrids bred at the Siberian Institute of Plant Physiology and Biochemistry, those were Syurpriz Baikala, Oktyabrenok, Senbernar. The lines possessing a particular resistance gene, Vetomold (Cf-2), PJ 1870021 (Cf-5) and F 7738 (Cf-6), were used as test varieties. Investigations were carried out in 2013, 2014 in heated plastic film greenhouses of Irkutsk Region. During these years, low air humidity resulted in moderate affections of tomato genotypes non-resistant to cladosporiosis. It has been established that the races Cladosporium fulvum, prevailed in the territory of Eastern Siberia, overcome the protection due to the gene Cf-2 of tomato. The genotypes with the resistance genes Cf-5, Cf-6, and Cf-9 were at the same time not affected with cladosporiosis. It was found that a number of hybrids (Imitator, Amur) ere affected with cladosporiosis despite the protection declared by Cf-5. The tomato hybrids Syurpriz Baikala, Senbernar, Oktyabrenok, Taganka, Yakimanka, Bulava, Maidan, Ostozhenka, Mitridat, Blagovest, Gusar were revealed to be promising. They are characterized by high resistance to cladosporiosis, high early and total yields, good eating and keeping qualities.