The difference of resistance level to Septoria gentian in Gentian.
C. TATEDA (1), R. Tomita (2), K. Sekine (3) (1) Iwate Biotechnology Research Center, Japan; (2) Iwate Biotechnology Research Center, Japan; (3) Univercity of Ryukyus, Japan

Gentian (Gentiana L.) is an important ornamental plant in Japan as well as in the business world. Several types of pathogen, including fungi (Septoria gentianae, Mycochaetophora sp. and Colletotrichum acutatum) and viruses (Gentian Kobu-sho associated virus, Cucumber mosaic virus and Gentian mosaic virus) cause serious damage to Gentian growth. Recently, we found that the resistance of Gentian plants depends on the mechanism of pathogen invasion. The fungal pathogen S. gentianae uses Gentian stomata to enter the host cell, whereas another fungal pathogen C. acutatum, isolated from Gentian, enter the host cell via the appressoria and haustorium. In breeding of commercial Gentian, we usually use the G.triflora, G. scabra and the interspecific hybrid between these two. G. scabra has fewer stomata on the adaxial side of the leaves than G.triflora. As a result, G. scabra can show resistance to S. gentianae but not to C. acutatum. Additionally, G. scabra shows high responsibility to S. gentianae. The interspecific hybrid between G. scabra and G.triflora also shows a similar defense response to G. scabra. Thus, Gentian could improve resistance to pathogen infection through 1) the less stomata on the adaxial side (pathogen invasion route) and 2) responsibility to pathogen infection.

Abstract Number: P17-624
Session Type: Poster