HSF phylogenetic tree from parsimony analysis of DBDs. Plant HSFs plus a yeast HSF were analyzed by using CLUSTALX V.1.8 software (52) with 1,000 repetitions by the bootstrap method. A consensus tree was generated with TREEVIEW software (53). At, Arabidopsis thaliana; Lp, Lycopersicon esculentum; Gm, Glycine max; Zm, Zea mays; Sc, Saccharomyces cerevisiae. Sequence data were taken from the GenBank database for the following accession numbers: AtHSF1, X76167; AtHSF3, Y14068; AtHSF21, U68561; AtHSF4, U68017; LpHSF8, X67600; LpHSF30, X67601; LpHSFA3, AF208544; LpHSF24, X55347; GmHSF21, Z46952; GmHSF34, Z46953; GmHSF5, Z46956; ZmHSFa, S61458; ZmHSFb, S61448; ZmHSFc, S61459; ScHSF, J03139.