Protein A. thaliana Homolog G. raimondii Homologs Identity (%) Tissue Monolignol AtABCG29 009G137200, 009G129000 57-72 m Transporter (At3g16340) 009G120300, 001G057200, 009G022400 55-57 sf Peroxidase AtPRX53 006G143400 74 m   (At5g06720) 004G093200 56 sf Peroxidase AtPRX72 011G211300, 006G143400, 003G151700 44-49 m   (At5g66390) 009G198700 57 sf Laccase AtLAC4 007G378200, 012G111900, 003G124600, 011G279600 64-79 m   (At2g38080) 009G093800, 003G124600 75 st     007G378200, 012G111900 77-79 sf Laccase AtLAC17 007G376600, 007G376800, 006G171500 68 m   (At5g60020) 007G376600, 006G171500 68 st     013G025500 78 sf

Table 1: Putative homologs of Arabidopsis thaliana proteins involved in monolignol transport and polymerization in cotton stem and seed fibres. A. thaliana protein sequences were used as queries to identify expressed sequence tags from G. hirsutum mixed tissues (m), stem (st) and seed fibres (sf) and these used to identify corresponding full length G. raimondii protein sequences.