The quality and quantity of mulberry leaves are often affected by various environmental factors. The plant
NPR1 and its homologous genes are important for plant systemic acquired resistance. Here, the full‐length cDNAs encoding the
NPR1 and
NPR4 genes (designated
MuNPR1 and
MuNPR4, respectively) were isolated from
Morus multicaulis. Sequence analysis of the amino acids and protein modeling of the MuNPR1 and MuNPR4 proteins showed that MuNPR1 shares some conserved characteristics with its homolog MuNPR4.
MuNPR1 was shown to have different expression patterns than
MuNPR4 in mulberry plants. Interestingly,
MuNPR1 or
MuNPR4 transgenic Arabidopsis produced an early flowering phenotype, and the expression of the pathogenesis‐related 1a gene was promoted in
MuNPR1 transgenic Arabidopsis. The
MuNPR1 transgenic plants showed more resistance to
Pseudomonas syringae pv. tomato DC3000 (
Pst. DC3000) than did the wild‐type Arabidopsis. Moreover, the ectopic expression of
MuNPR1 might lead to enhanced scavenging ability and suppress collase accumulation. In contrast, the
MuNPR4 transgenic Arabidopsis were hypersensitive to
Pst. DC3000 infection. In addition, transgenic Arabidopsis with the ectopic expression of either
MuNPR1 or
MuNPR4 showed sensitivity to salt and drought stresses. Our data suggest that both the
MuNPR1 and
MuNPR4 genes play a role in the coordination between signaling pathways, and the information provided here enables the in‐depth functional analysis of the
MuNPR1 and
MuNPR4 genes and may promote mulberry resistance breeding in the future.
相似文献