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Some roots morphological characteristics in 51 Solanum phureja genotypes and its relation to powdery scab infection response were evaluated. Tubers of different genotypes, with specific skin color and form were planted in pots. Three weeks later the roots were removed and cutting of transverse histological sections were performed to determine the thickness of the epidermis, cortical parenchyma thickness and diameter of the parenchymal cells. The obtained information was correlated with the powdery scab severity estimated in roots under field conditions. We found that C43 and C100 genotypes resistant in field trials, showed a greater thickness of the epidermis susceptible genotypes. The same pattern was evident when assessing the thickness of the cortical parenchyma and the diameter of the cortical cells. We also found that genotypes with more than 9 microns for the thickness of the epidermis, 40 m for the thickness of the parenchyma or 8 microns to the diameter of the cortical cells values have low disease severity on roots, being possible to use these parameters to classify the potato resistant genotypes in Solanum phureja. Genotypes with red skin in tuber seed may have a greater resistance to the disease in roots.

Atributos Morfológicos de las Raíces de Genotipos de Solanum Phureja Juz et Buk y su Relación con la Severidad de la Sarna Polvosa