Identification of differentially-expressed genes of rice in overlapping responses to bacterial infection by Xanthomonas oryzae pv.oryzae and nitrogen deficiency

摘要

cqvip:Bacterial blight of rice caused by Xanthomonas oryzae pv.oryzae(Xoo) is one of high nitrogen(N) responsive diseases.Rice plants became more disease resistant with decreasing N suggesting that the crosstalk between disease resistance and N utilization pathways might exist.However,the co-regulatory components in such crosstalk have not been elucidated.Here,we comparatively analyzed the gene expression profiling of rice under Xoo inoculation,low N treatment,or a combination of both stresses,and identified the differentially-expressed genes(DEGs) in overlapping responses.These DEGs were involved in different biological processes,including innate immunity and nitrogen metabolism.The randomly-selected DEGs expression was validated by quantitative real-time PCR assays.Temporal expression of six genes from different functional categories suggested that N condition was the dominant factor when both stresses were present.These DEGs identified provide novel insights into the coordinated regulatory mechanism in biotic and abiotic stress responses in rice.