几种桃砧木对南方根结线虫的抗性研究

Potted-seedlings of four peach rootstocks, wild Peach ( Prunus persica ), Downy cherry ( Prunus tomentosa ), Tsukuba-4 and Tsukuba-5 ( two hybrid varieties of P. persica var. densa × P. persica ), were incubated with the root-knot nematode ( Meloidogyne incognita Chitwood ) to evaluate their resistance to this nematode. Tsukuba-4 and Tsukuba-5 were immune genotypes to M. incognita, and can stably transfer this resistance to the progeny, with no resistance separation among the seedlings. Resistant seedlings of Downy cherry were grouped into two types, the immune type and the highly resistant type. There were significant differences among wild Peach seedling, ranked as highly resistant genotype and susceptible one. To Downy cherry and wild Peach, whether there were other types of resistances should be further investigated.