Identification of Chrysanthemum Genetic Resources Resistant to White Rust Caused by Puccinia horiana

Abstract

This experiment was carried out to identify genetic resources of chrysanthemum wild species and commercial cultivars that are resistant to white rust disease caused by Puccinia horiana. A total of 190 chrysanthemum accessions, composed of 11 accessions belonging to six wild species and 179 commercial cultivars, were screened for resistance to P. horiana isolates collected from Muan and Jeonju, the main production area of chrysanthemum in Korea. A total of 41 spray cultivars and three wild species (Chrysanthemum boreale, C. yoshinaganthum, and C. zawadskii) were identified as resistant. Nine standard and 28 spray cultivars with poorly developed chlorotic lesions and pustules on the leaves were moderate resistant. The remaining 18 standard, 83 spray cultivars and three wild species (Aster spathulifolius, C. indicum, and C. pacificum) were highly susceptible. The use of resistant cultivars is one of the most efficient approaches for overcoming white rust disease in chrysanthemum cultivation. Therefore, these genetic resources can be used in crossbreeding programs for developing white rust resistant chrysanthemum cultivars.

A comparative analysis of the complete chloroplast genomes of three Chrysanthemum boreale strains

“…C. boreale is resistant to one of the most destructive fungal diseases, namely white rust caused by Puccinia horiana Henn. ( Park et al, 2014 ), and it has anti-inflammatory and skin-regenerative properties ( Kim et al, 2015b , 2010 ). Several C. boreale strains collected from natural stands in Korea displayed variations in morphology such as leaf shapes and flower head, and in karyotype with the occurrence of aneuploidy ( Hoang et al, 2020 ; Hwang et al, 2013 ).…”

The complete mitochondrial genome sequence of Chrysanthemum boreale (Asteraceae)

“…Chrysanthemum boreale, a wild species with small, yellow flowers, is distributed throughout eastern Asia (Kim et al 2003) and has been used for medicinal and herbal purposes, due to its antibacterial, anti-inflammatory, and skinregenerating properties (Kim et al 2003;Kim et al 2010;Kim et al 2015). As C. boreale is resistant to white rust disease, this plant may be a suitable genetic resource to develop disease-resistant chrysanthemum cultivars (Park et al 2014). Only two mitogenomes from the Asteraceae family (Helianthus annuus and Diplostephium hartwegii) have been deposited in GenBank and no mitogenome for the Chrysanthemum genus has been reported.…”

Comparative transcriptome analysis reveals whole-genome duplications and gene selection patterns in cultivated and wild Chrysanthemum species

“…Moreover, one outstanding trait found in the wild relatives of domesticated species is better disease and pest resistance compared to their domesticated counterparts (Warschefsky et al 2014 ). Indeed, C. boreale is more resistant to white rust disease caused by Puccinia horiana than C. morifolium , (Park et al 2014 ). Perhaps stress triggered by pathogens has induced the molecular evolution or positive selection of a broad range of genes for disease resistance or defense during domestication or selection by breeders, which has played an important role in the divergence of the two Chrysanthemum species.…”