Fig. 1

phylogenetic trees of pPLA genes. Two unrooted phylogenetic trees were constructed by the MEGA7.0 Maximum-likelihood method. The percentage of replicate trees in which the associated taxa clustered together in the bootstrap test (1000 replicates) is shown next to the branches. All positions with less than 90% site coverage were eliminated. (A) Phylogenetic relationship of the 294 identified pPLA genes from four cotton species and nine other plant species. (B) A phylogenetic tree of pPLA genes in four cotton species