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Background  Thaxtomin A (TA) is a phytotoxin produced by plant pathogenic  Streptomyces  spp .  responsible for potato common scab. TA inhibits cellulose biosynthesis in expanding plant tissues and is essential for disease induction. Auxin treatment of various plant tissues has been repeatedly demonstrated to inhibit TA toxicity and to reduce common scab. This work utilises  Arabidopsis thaliana  mutants with resistance to cellulose biosynthesis inhibitors (CBIs) to investigate the interaction between TA, other CBIs and auxins.    Results  Three CBI resistant  A. thaliana  mutants;  txr1-1  (tolerance to TA),  ixr1-1  (tolerance to isoxaben - IXB) and  KOR1  (cellulose deficiency), showed no altered root growth response to treatment with natural or synthetic auxins, nor with the auxin efflux transport inhibitor 2,3,5-Triiodobenzoic acid (TIBA). However, all mutants had significantly enhanced tolerance to 1-napthylphthalamic acid (NPA), another auxin efflux transport inhibitor, which blocks polar auxin transport at a site distinct from TIBA. NPA tolerance of  txr1-1  and  ixr1-1  was further supported by electrophysiological analysis of net H +  fluxes in the mature, but not elongation zone of roots. All three mutants showed increased tolerance to IXB, but only  txr1-1  showed tolerance to TA. No mutant showed enhanced tolerance to a third CBI, dichlobenil (DCB).    Conclusions  We have demonstrated that plant tolerance to TA and IXB, as well as cell wall synthesis modifications in roots, have resulted in specific co-resistance to NPA but not TIBA. This suggests that CBI resistance has an impact on polar auxin efflux transport processes associated with the NPA binding protein. We also show that NPA inhibitory response in roots occurs in the mature root zone but not the elongation zone. Responses of mutants to CBIs indicate a similar, but not identical mode of action of TA and IXB, in contrast to DCB.

bmc plant biology

Enhanced resistance to the cellulose biosynthetic inhibitors, thaxtomin A and isoxaben in Arabidopsis thaliana mutants, also provides specific co-resistance to the auxin transport inhibitor, 1-NPA