CURRENT RESEARCH IN THE NETHERLANDS ON IMPROVEMENT OF BREEDING AND SELECTION METHODS FOR RESISTANCE OF CARNATIONS TO FUSARIUM OXYSPORUM F. SP. DIANTHI
Attempts at improvement are based on results of basic research on host-parasite relationship. Sofar, information on histological changes in the vascular system has led to improved interpretation of internal symptoms; information on passive transport of spores through wounds, has led to methods to minimize root damage.
The existence of two distinct resistance mechanisms is postulated:
- resistance to penetration of the roots, whether actively or passively through wounds, and
- resistance against growth of the fungus through the vascular system.
The consequences of such a situation for screening and breeding are discussed.