Assessment of allelic Mi-1.2 dosage effects on levels of resistance to virulent and avirulent Meloidogyne spp. populations in some tomato rootstocks

What is it about?

Seven tomato rootstocks with distinct resistance allelic conditions at the Mi-1.2 locus and one susceptible control (cultivar ‘Santa Clara’) were used in the present study. Significant dosage effects of Mi-1.2 alleles in reducing the reproduction factors (RF) were observed, but restricted to the avirulent Meloidogyne spp. populations. Homozygous resistant (Mi-1.2/Mi-1.2) cultivars, except TD1, prevented reproduction of avirulent nematodes in contrast with the heterozygous allele combination (Mi-1.2/mi-1.2), which allowed a certain level of nematode reproduction. The cultivar 'Santa Clara' and 'DR6632TX' (mi-1.2/mi-1.2) were susceptibles. The efficiency and durability of the Mi-1.2 gene depend on its proper management under commercial field conditions and hybrids carrying the double dosage of the Mi-1.2 gene would reduce the potential emergence of new agressive populations.The efficiency and durability of the Mi-1.2 gene depend on its proper management under commercial field conditions using also crop rotation with resistant cultivars.

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