Abstract
Abstract Inheritance of the bitter pit disorder was determined in the field on fruiting seedlings resulting from crosses between the highly susceptible cultivar ‘Prima’, Coop 11 (a scab-resistant advanced selection), and 3 other scab-resistant selections. Segregation ratios indicated that 2 major genes controlled resistance. Both dominant genes, designated Bp-1 and Bp-2, were required to confer resistance. Analysis of leaf and peeled fruit tissues for Ca, Mg, K, and B indicated the presence of higher levels of Ca and B, and lower levels of Mg and K on a dry weight basis in resistant seedlings. A gradient was observed through the flesh on the fruit for all elements tested. Ca content was elevated at the base, but dropped rapidly towards the apex in susceptible fruits. Mg was reduced at the base and increased towards the apex in all fruits, but its level increased sharply in susceptible fruits.
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