Abstract
AbstractSoybean stem canker (SSC) caused by the fungal pathogenDiaporthe caulivorais an important disease affecting soybean production. However, limited information related to the molecular mechanisms underlying soybean resistance toDiaporthespecies is available. In the present work, the defense responses toD. caulivorain two contrasting soybean genotypes were analyzed. We showed thatGénesis5601 is more resistant to fungal infection than Williams, evidenced by significantly smaller lesion length, reduced disease severity and pathogen biomass. Transcriptional profiling was performed in untreated plants and inD. caulivora-inoculated and control-treated tissues at 8 and 48 hours post inoculation (hpi). In total, 2.322 and 1.855 genes were differentially expressed in Génesis 5601 and Williams, respectively. Interestingly, Génesis 5601 exhibited a significantly higher number of upregulated genes compared to Williams at 8 hpi, 1.028 versus 434 genes. Resistance toD. caulivorawas associated with defense activation through transcriptional reprogramming mediating perception of the pathogen by receptors, biosynthesis of phenylpropanoids, hormones, small heat shock proteins and pathogenesis related (PR) genes. These findings provide novel insights into soybean defense molecular mechanisms used to controlD. caulivora, and generate a foundation for development of resistant SSC varieties within soybean breeding programs.
Publisher
Cold Spring Harbor Laboratory
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