Abstract
Nucleotide-binding site and leucine-rich repeat (NBS-LRR) genes represent the most important disease resistance genes in plants. The genome sequence of kiwifruit (Actinidia chinensis) provides resources for the characterization of NBS-LRR genes and identification of new R-genes in kiwifruit. In the present study, we identified 100 NBS-LRR genes in the kiwifruit genome and they were grouped into six distinct classes based on their domain architecture. Of the 100 genes, 79 are truncated non-regular NBS-LRR genes. Except for 37 NBS-LRR genes with no location information, the remaining 63 genes are distributed unevenly across 18 kiwifruit chromosomes and 38.01% of them are present in clusters. Seventeen families of cis-acting elements were identified in the promoters of the NBS-LRR genes, including AP2, NAC, ERF and MYB. Pseudomonas syringae pv. actinidiae (pathogen of the kiwifruit bacterial canker) infection induced differential expressions of 16 detected NBS-LRR genes and three of them are involved in plant immunity responses. Our study provides insight of the NBS-LRR genes in kiwifruit and a resource for the identification of new R-genes in the fruit.
Highlights
Kiwifruit (Actinidia chinensis) is well known for its high vitamin C content and spectacular flavor and it is popular with more and more people
16 detected Nucleotide-binding site and leucine-rich repeat (NBS-LRR) genes and three of them are involved in plant immunity responses
100 NBS-LRR protein coding sequences were identified in A. chinensis (Table S1)
Summary
Kiwifruit (Actinidia chinensis) is well known for its high vitamin C content and spectacular flavor and it is popular with more and more people. Chinensis [1] are loved by a lot of Chinese people. With the rapid growth of the planting area, various diseases bring a serious threat to kiwifruit. One of the most serious diseases is the kiwifruit bacterial canker, which once brought about serious losses, especially to New Zealand. From the year 2010 to 2012, 37% of orchards in New Zealand were infected by bacterial canker [2]. As more and more countries grow kiwifruit and due to the strong transmission capacity of the pathogen, the disease has spread to the main kiwifruit planting countries, such as Portugal [3], Spain [4], France [5], Turkey [6], Greece [7] and China
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