Rootstock resistance against Tetranychus urticae in citrus is transmitted to grafted varieties probably activating jasmonic acid- dependent signalling


Abstract: In agriculture specific genotypes are commonly used as rootstocks in commercial orchards due to their good rooting properties and response to abiotic stresses and pathogens. It is known that different citrus rootstocks can affect the fitness of Tetranychus urticae in the leaves of the same variety. The resistant rootstock (sour orange) increases the levels of the OPDA and JA in the undamaged distal leaves in infested plants and also in grafted varieties. These results suggest that a mobile signal is transmitted from rootstock to upper parts and it could be a precursor of the oxylipin pathway.

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