DIFFERENCES IN MALTING PERFORMANCE BETWEEN BARLEYS GROWN IN SPAIN ANDSCOTLAND

Two barley genotypes were grown, in 2 seasons, at sites in both Scotla nd and Spain. The development of enzyme levels and endosperm modificat ion were assayed. over the final 3 days of malting. Spanish grown samp les demonstrated faster and more extensive synthesis of both alpha-amy lase and beta-glucanase, more rapid cell wall modification and a great er reduction in milling energy during malting than Scottish grown samp les. Malt milling energy was strongly associated with cell wall breakd own, which was a limiting step in modification of Scottish. but not Sp anish, grown samples. Extract levels were not related to alpha-amylase activity, but Kolbach index exhibited an association with extract at both sites.