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The  Mi  gene, which is the only source of resistance to the root-knot nematodes  M. incognita  and  M. javanica  in tomatoes, is effective only at soil temperatures below 28C. This single dominant gene exists in a homozygous form in certain tomato cultivars, in a heterozygous form in others, and is lacking in others. It has also been introduced into heat-tolerant and heat-sensitive cultivars. The availability of such genotypes allows determining whether a) the homozygous form provides more resistance than the heterozygous form and b) heat tolerance protects the  Mi  gene at high-temperature stress. The results of in vitro tests using excised roots show that the resistance offered by the  Mi  gene in the homozygous or the heterozygous form to  M. incognita  and  M. arenaria  was the same. The presence of heat tolerance gene did not protect the  Mi  gene from losing its effectiveness above 28C.

Resistance in Tomatoes to Meloidognyne incognita and M. arenaria as Affected by Gene Mi Heterozygosity and Temperature