ESTIMATION OF TOBACCO RESISTANCE TO PHYTOPHTHORA PARASYTICA VAR. NICOTIANAE BY ROOT INOKULATION

Tashkoski, Petre (2003) ESTIMATION OF TOBACCO RESISTANCE TO PHYTOPHTHORA PARASYTICA VAR. NICOTIANAE BY ROOT INOKULATION. Tobacco, 53 (1-2). pp. 53-61. ISSN 0494-3244

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Abstract

Results of the analyses made in Biological laboratory by root inoculation of young tobacco plants led to the following conclusions: Investigated species of the genus Nicotiana inoculated by this method showed considerably high level of resistance. The highest resistance to both races of the pathogen was that of Nicotiana nesophila, where no infected plants were observed. In N. longiflora and N. plumbaginifolia the level of infection was low, mainly with the isolate P14, which belongs to the physiological race 1. With race 0 isolates, the infection was insignificant. Among the introduced varieties, the highest resistance to both races of the pathogen was observed in Coker 371 gold and Beinhart 1000-1. The varieties B 37 and NC 2326 had medium level of resistance to both races. The variety Ky 14 x L8 confirmed its resistance to race 0 and susceptibility to race 1 of the pathogen. The highest level of susceptibility was observed in Ky 14. It was infected by the race 1 and race 2 isolates in almost equal parts. All varieties of domestic origin, except for the variety YK 125/3, showed a medium level of resistance to the race 0 isolates and high level of susceptibility to race 1. The most resistant variety inoculated by this method was YK 125/3, in which low disease index was recorded with both race 0 and with race 1. The disease index in this variety ranged from 1.7 in race 0 to 2.8 in race 1. The method of root inoculation of tobacco seedlings makes it possible to check the level of resistance to Phytophthora parasitica var. nicotianae in the early stages of breeding the new tobacco varieties.

Item Type: Article
Subjects: Scientific Fields (Frascati) > Agricultural Sciences > Agriculture, forestry and fisheries
Divisions: Scientific Tobacco Institute
Depositing User: Ms Biljana Jordanoska
Date Deposited: 03 Nov 2016 19:45
Last Modified: 03 Nov 2016 19:45
URI: http://eprints.uklo.edu.mk/id/eprint/373

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