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Background   Nicotiana benthamiana  is widely used as a model plant to study plant-pathogen interactions. Fasciclin-like arabinogalactan proteins (FLAs), a subclass of arabinogalactan proteins (AGPs), participate in mediating plant growth, development and response to abiotic stress. However, the members of FLAs in  N. benthamiana  and their response to plant pathogens are unknown.    Results  38  NbFLAs  were identified from a genome-wide study.  NbFLAs  could be divided into four subclasses, and their gene structure and motif composition were conserved in each subclass.  NbFLAs  may be regulated by cis-acting elements such as STRE and MBS, and may be the targets of transcription factors like C2H2. Quantitative real time polymerase chain reaction (RT-qPCR) results showed that selected  NbFLAs  were differentially expressed in different tissues. All of the selected  NbFLAs  were significantly downregulated following infection by turnip mosaic virus (TuMV) and most of them also by  Pseudomonas syringae pv tomato  strain DC3000 ( Pst  DC3000), suggesting possible roles in response to pathogenic infection.    Conclusions  This study systematically identified  FLAs  in  N. benthamiana , and indicates their potential roles in response to biotic stress. The identification of  NbFLAs  will facilitate further studies of their role in plant immunity in  N. benthamiana.

bmc plant biology

Fasciclin-like arabinogalactan gene family in Nicotiana benthamiana: genome-wide identification, classification and expression in response to pathogens