Fig. 4.

Plot representing significant signals of natural selection acting on individual codon sites within: (a) narcissus late season yellows virus (NLSYV) coat protein (CP) region, (b) NLSYV partial nuclear inclusion b protein (NIb) region, and (c) narcissus yellow stripe virus (NYSV) CP region. The Abs (Absolut) dN-dS values are plotted for negative (black) and positive (red, blue and green) selection signals. Sites at which episodic diversifying selection was detected using mixed effects model evolution (MEME) method are represented by blue bars, sites at which pervasive diversifying selection was detected using fixed effects likelihood (FEL) and random effect likelihood (REL) methods are shown in green, and those detected to be under both pervasive and episodic selection are shown in red. Codon 1 is the beginning of each cistron and codons 274, 211 and 267 are the termination of NLSYV CP, NLSYV NIb and NYSV CP, respectively