Resistance of common bean to Meloidogyne javanica under elevated temperatures


Rodrigo R. Fidelis, Danilo P. Ramos, Paulo R. Pereira, Ildon R. do Nascimento, Vitor de L. Nascimento and Karen C. L. Silva


The aim of this work was to assess the resistance of seven commercial cultivars of common bean, black typ, (Xamego, BRS-Grafite, IAC-Diplomata, BRS-Esplendor, IPR-Uirapuru, IPR-Tiziu, and IAC-Una) to M. javanica under elevated temperature condition. The greenhouse experiments were carried out in a complete randomized design, with four replications and five plants per plot. The susceptible tomato cultivar Santa Clara was used to evaluate inoculation efficiency and reproduction index. The classification of resistance levels was estimated according to galls index, size of galls, position of galls, and reproduction index relative to tomato plants. In relation to common beans, there was no significant difference among cultivars in the evaluated traits, except for size of galls, indicating which there is no big genetic variability about M. javanica resistance. The elevated temperatures probably contributed to the non-observation of greater resistance degrees among the evaluated cultivars. Regarding the reproduction index, the cultivar IAC-Una was classified as moderately resistant to M. javanica.


Phaseolus vulgaris L., Nematode, Black Type, Genetic Variability

Amaz. Jour. of Plant Resear. 1(2): 101-106. October 2017
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