Effects of Host Resistance and Temperature on Development of Globodera tabacum solanacearum

J. Wang

Abstract


Penetration and development of juveniles of tobacco cyst nematode (Globodera tabacum solanacearum) on a resistant (NC567) and a susceptible (K326) cultivar of flue-cured tobacco (Nicotiana tabacum L.) were determined in root zone chamber experiments. More vermiform juveniles developed into a swollen shape at 22, 27, and 31ºC than at 17ºC. Development of flask-shaped nematodes appeared to be similar across tested temperatures (17, 22, 27, and 31ºC). General patterns of penetration and development of juveniles in both resistant and susceptible cultivars were similar under all temperatures tested. More vermiform, swollen, and flask-shaped nematodes were found in roots of K326 than in those of NC567. Development from swollen to flaskshaped nematodes appeared to be similar between the two cultivars, although more vermiform juveniles developed into swollen nematodes on K326 than on NC567. Differences in resistance between the two cultivars remained stable across tested temperatures.

Keywords


development; flue-cured tobacco; globodera tabacum solanacearum; nicotiana tabacum; parasitism; resistance; screening; temperature; tobacco cyst nematode

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