Characterization of Cuscuta campestris Cell Wall Genes Responsible for the Haustorial Invasion of Host Plants

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Cuscuta is one of the most widespread genera of parasitic plants that subsiston various types of herbaceous angiosperms. Since their hosts include economically im-portant crops, understanding the molecular basis of parasitism in Cuscuta species is criti-cal for crop production. Despite the advances in biology and agriculture, the mechanisms of host plant infection by parasitic plants remain largely unknown. To gain insight into the mechanism of parasitism, we focused on Cuscuta campestris genes encoding enzymes in-volved in the degradation and modification of host cell walls. Analysis of previously pub-lished RNA-seq data showed that certain genes encoding pectin methylesterases, poly-galacturonases, and cellulase-like enzymes, which can potentially enzymatically weaken cell-to-cell adhesion, were correlated with the haustorial invasion of host tissues. These data confirm that haustorial invasion by Cuscuta species is facilitated not only by mechani-cal action but also by specific biochemical degradation and modification of host cell walls.

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