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Bacterial wilt caused by Ralstonia solanacearum is a major disease causes severe yield and quality losses in mulberry (Morusatropurpurea),but little is known about the molecular mechanism of resistance.Using RNA-seq technique,we analyzed transcriptional changes of resistance (KQ10 and YS283) and susceptible (YSD10)mulberry cultivars at the early interaction in response to R.solanacearum infection.We observed 798 genes were regulated specifically in both resistant cultivars but not in susceptible cultivar after infection with R.solanacearum,including 502 up-regulated and 296 down-regulated genes,respectively.Interesting,we found a large amount of genes (61 genes) associated with cell wall modification were regulated specifically in resistant cultivars,which were divided into ten major groups.The largest group was glucosyltransferase family,following pectinesterase inhibitor,glucanase,and glycoprotein families,suggesting that cell wall modifications play a major role on resistance levels in mulberry.This transcriptional analysis paves the way forelucidating the molecular mechanisms in the resistance response to R.solanacearum in mulberry.