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Banana  Fusarium  wilt caused by  Fusarium oxysporum  f. sp.  cubense (Foc ) is soil-borne disease of banana ( Musa  spp.) causing significant economic losses. Extensins and arabinogalactan proteins (AGPs) are cell wall components important for pathogen defence. Their significance for  Foc  resistance in banana was not reported so far. In this study, two banana cultivars differing in  Foc  sensitivity were used to monitor the changes in transcript levels, abundance and distribution of extensins and AGPs after wounding and  Foc  inoculation. Extensins mainly appeared in the root cap and meristematic cells. AGPs recognized by JIM13, JIM8, PN16.4B4 and CCRC-M134 antibodies located in root hairs, xylem and root cap. Individual AGPs and extensins showed specific radial distribution in banana roots. At the transcript level, seven extensins and 23 AGPs were differentially expressed between two banana cultivars before and after treatments. Two extensins and five AGPs responded to the treatments at the protein level. Most extensins and AGPs were up-regulated by wounding and pathogen inoculation of intact plants but down-regulated by pathogen attack of wounded plants. Main components responsible for the resistance of banana were  MaELP - 2  and  MaPELP - 2 . Our data revealed that AGPs and extensins represent dynamic cell wall components involved in wounding and  Foc  resistance.

Expression and distribution of extensins and AGPs in susceptible and resistant banana cultivars in response to wounding and Fusarium oxysporum