Abstract
Pith and perimedullar tissue expansion was measured in 19 potato clones from an irrigated and a dryland location to evaluate their correlation to hollow heart susceptibility. For combined locations, neither pith nor perimedullar expansion nor their differential was significantly correlated to hollow heart frequency. Expansion was most highly correlated to tuber water potential. Under irrigated conditions, hollow heart was positively correlated with specific gravity and pith expansion. Hollow heart frequency and leaf transpiration was investigated for nine cultivars. Hollow heart and transpiration were positively correlated. Eighty-eight percent (88%) of the total variation in hollow heart was explained as a quadratic function of transpiration.
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