Fig. 1

Gene Ontology (GO) classification of assembled unigenes in two tall fescue cultivars, Pb-tolerant Silverado and Pb-sensitive AST7001. a Functional categorization of two cultivars under control condition; (b) Functional categorization after 4 h of Pb treatment; (c) Functional categorization after 48 h of Pb treatment. The unigenes were summarized in three main GO categories (biological process, cellular component and molecular function) and 48 subcategories. The x-axis indicated the subcategories, while the y-axis indicated the percentage of each subcategory in their category