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Asparagus kiusianus , an important wild relative of cultivated asparagus ( A .  officinalis ), exhibits resistance to stem blight disease caused by  Phomopsis asparagi . However, the mechanisms underlying this resistance are not understood and no transcriptomic or genetic resources are available for this species.  De novo  transcriptome sequencing of  A .  officinalis  and  A .  kiusianus  stems was performed 24 h after inoculation with  P .  asparagi . In total, 35,259 and 36,321 transcripts were annotated in  A .  officinalis  and  A .  kiusianus , respectively. 1,027 up-regulated and 752 down-regulated transcripts were differentially expressed in the two  Asparagus  species. RNA sequencing data were validated using quantitative real-time reverse transcription PCR. Several defense-related genes including  peroxidase 4 ,  cationic peroxidase SPC4 - like ,  pathogenesis - related protein - 1 - like , and jasmonic acid biosynthesis and signaling-related genes including  phospholipase D alpha 1 ,  12 - oxophytodienoate reductase  and  jasmonate - induced protein 23 KD  were up-regulated in  A .  kiusianus  relative to  A .  officinalis . In addition, infected  A .  kiusianuns  exhibited a substantial increase in jasmonic acid and methyl jasmonate relative to  A .  officinalis . Peroxidase activity was significantly elevated in infected  A .  kiusianus  compared with infected  A .  officinalis . Our transcriptomic database provides a resource for identifying novel genes and molecular markers-associated with  Phomopsis  disease resistance and will facilitate breeding and improvement of cultivated asparagus varieties.

Comparative de novo transcriptome profiles in Asparagus officinalis and A. kiusianus during the early stage of Phomopsis asparagi infection