Efectos de los nemátodos de quistes sobre las relaciones de agua de dos variedades de papa

Abstract

Studies have been made under controlled conditions of two potato varieties ‘Maris Piper and ‘Pentland Dell’ (ten weeks old) in small pots with soil infested with three levels of potato cyst-nematode, Globodera rostochiensis (0, 160 and 800 eggs/g soil) under wet and dry soil moisture conditions. Maris Piper, a resistant variety, showed greater leaf area, larger canopy diffusive resistance and transpiration rate at the same leaf water potential along the range of leaf water potentials studied, and therefore, higher drought resistance than Pentland Dell, a susceptible variety. Both varieties behaved similary in wet soil when infested by nematodes, but leaf water potentials of Pentland Dell were significantly lower for the investigated three nematode levels under low soil water potentials