Articles

Identification of candidate genes associated with the defense response following Albugo candida inoculation in Brassica rapa L.

Article number
1404_63
Pages
469 – 476
Language
English
Abstract
White rust is a serious disease of the genus Brassica caused by the biotrophic oomycete pathogen Albugo candida and decreases the yield in Brassica rapa vegetables.
Resistant (‘Nanane’) and susceptible (‘Misugi’) komatsuna (B. rapa L. var. perviridis) cultivars have different immune responses to A. candida inoculation, however, the resistance gene against white rust as well as the mechanism of how host plants respond to A. candida is still unknown.
We performed transcriptome analysis at 48 and 72 h after A. candida inoculation (HAI) in ‘Nanane’ and ‘Misugi’ and identified genes differentially expressed (DEGs) between cultivars (N>M or N<M expression). Gene ontology (GO) analysis using genes showing N>M expression at 48 and 72 HAI showed that A. candida inoculation activated systemic acquired resistance (SAR), immunity, and defense response.
Using genes showing N<M expression at 48 and 72 HAI, GO analysis showed the overrepresentation of categories related to secondary metabolic processes and responses to abiotic stress.
These results suggest a role for SAR in the defense response to A. candida, particularly in the effector-triggered immunity (ETI) downstream pathway.
These findings will be useful for identifying genes or pathways associated with the defense response to A. candida and contribute to understanding the mechanism of resistance against A. candida.

Publication
Authors
M.A. Akter, N. Miyaji, M. Shimizu, H. Mehraj, M.A.U. Doullah, I. Chuma, R. Fujimoto
Keywords
systemic acquired resistance, biotrophic pathogen, komatsuna, transcriptome, white rust
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