Mild salinity stimulates a stress-induced morphogenic response in Arabidopsis thaliana roots

摘要: Plant roots exhibit remarkable developmental plasticity in response to local soil conditions. It is shown here that mild salt stress stimulates a stress-induced morphogenic (SIMR) Arabidopsis thaliana characteristic of several other abiotic stresses: the proliferation lateral (LRs) with concomitant reduction LR and primary root length. The component SIMR dramatically enhanced by transfer seedlings from low high NO3− medium, thereby compensating for decreased length maintaining overall surface area. Increased specific (osmotic alone has no stimulatory effect) due progression more primordia pre-emergence emergence stage, salt-stressed plants. In seedlings, greater numbers expression reporter gene driven auxin-sensitive DR5 promoter than unstressed seedlings. Moreover, auxin transporter mutant aux1-7, completely abrogated. results suggest promotes accumulation developing preventing their arrest at stage. Examination ABA ethylene mutants revealed synthesis factor involved signalling network also regulate SIMR.