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Fig. 3. Principal component (PC) analysis projections on axes 1 and 2. (a) Eigenvalues are presented as vectors for the following traits: contribution of preanthesis assimilates to the grain by the spike (CS), flag leaf blade (CFB), flag leaf sheath (CFS), other leaf blades (CL), and stem (CST), final grain weight (WG), dry weight of the spike (WS), flag leaf blade (WFB), flag leaf sheath (WFS), other leaf blades (WL), and stem (WST), days from sowing to anthesis (DSA), relative main stem weight with regard to total aboveground plant biomass (%MS), and grain yield per hectare. (b) Values of the cultivars are symbolized by their period and country: old Italian (OI), intermediate Italian (II), modern Italian (MI), old Spanish (OS), intermediate Spanish (IS), and modern Spanish (MS).
