Abstract
The Nanfengmiju (Citrus reticulata cv. Nanfengmiju), a high-quality local variety of mandarin, is one of the major fruit crops in Jiangxi Province, China. Citrus melanose and stem-end rot, two common fungal diseases of Nanfengmiju, are both caused by Diaporthe spp. (syn. Phomopsis spp.). Identification of the Diaporthe species is essential for epidemiological studies, quarantine measures, and management of diseases caused by these fungi. Melanose disease was observed on Nanfengmiju fruit in Jiangxi Province of China in 2016. Based on morphological characterization and multi-locus phylogenetic analyses, three out of 39 isolates from diseased samples were identified as D. passifloricola. Since these three isolates did not cause melanose on citrus fruit in the pathogenicity tests, they were presumed to be endophytic fungi present in the diseased tissues. However, our results indicate that D. passifloricola may persist as a symptom-less endophyte in the peel of citrus fruit, yet it may cause stem-end if it invades the stem end during fruit storage. To the best of our knowledge, this is the first report of D. passifloricola as the causal agent of the stem-end rot disease in Citrus reticulata cv. Nanfengmiju.
Highlights
As the earliest citrus producer in the world, China has over 4000 years of history of citrus cultivation
Since 95% of citrus is consumed as fresh fruit in China, melanose and stem-end rots diseases reduce the economic value of this crop seriously
The alpha conidia of D. miriciae are not described of guttulate characterized [23], and the beta conidia of D. ueckerae are not observed in a previous study [42]
Summary
As the earliest citrus producer in the world, China has over 4000 years of history of citrus cultivation. The citrus industry of China covers more than 20 provinces [1]. One of the most common fungal diseases of citrus worldwide [3,4], generally occurs in many citrus-growing regions of China, such as Chongqing, Fujian, Guangdong, Guangxi, Hunan, Jiangxi, Shaanxi, Shanghai, Zhejiang, and so on [5,6,7]. Phomopsis) are the causal agents of melanose and can cause stem-end rots on fruit during the storage period. Since 95% of citrus is consumed as fresh fruit in China, melanose and stem-end rots diseases reduce the economic value of this crop seriously
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