First Report of Leaf Spot Caused by Alternaria alternata on Artemisia stolonifera (Maxim) Komar. in China.

IF 4.4 2区 农林科学 Q1 PLANT SCIENCES
Yang Xu, Nana Chang, Chu Wang, Ye Wang, Hui Li
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引用次数: 0

Abstract

Artemisia stolonifera (Maxim.) Komar., also known as the 'elite of Artemisia', is currently widely planted in Jiangxi, Hubei, and other provinces in China. Since April 2023, a leaf spot on Ar. stolonifera was observed in the total cultivation area of 33.33 ha in Zhangshu City, Jiangxi Province. The incidence was 50% to 60%. Small irregular blackish-brown spots first appeared on the leaves, some with chlorotic margins, which later joined into clumps. In severe cases, the leaves were completely necrotic, seriously affected the growth and quality of Ar. stolonifera. Small pieces (3 to 4 mm) were excised from the necrotic borders of 20 typical symptomatic infected leaves, disinfected with 2.5% sodium hypochlorite solution for 3 min, rinsed five times with sterile water, and placed on potato dextrose agar (PDA) medium, incubated at 25℃ for 5 days. 15 purified isolates with similar morphological characteristics were obtained by transferring hyphal tips (isolation frequency of 75%). The colonies on PDA initially were white, and then became olive green with a white rim. After 10 days of culture on potato carrot agar medium (PCA), the conidia were septate, light brown in color, with dimensions ranging from 10.82 to 30.59 × 7.12 to 11.97 μm (n=50). The culture and morphological characteristics corresponded to Alternaria spp. (Simmons 2007), and the representative isolates JNC01 and JNC02 were used for further identification. To further identify the isolates, the RNA polymerase II second largest subunit (RPB2), internal transcribed spacer (ITS), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), Alternaria major allergen (Alt a1), translation elongation factor 1-alpha (TEF-α) and histone 3 (HIS3) were amplified using primers RPB2-5F2/RPB2-7CR, ITS1/ITS4, gpd1/gpd2, Alt a1-F/Alt a1-R , EF1-728F/EF1-986R and H3-1a/1b, respectively (Glass and Donaldson 1995; Lawrence et al. 2013; Berbee et al. 1999; Hong et al. 2005). The subsequent sequences were deposited in GenBank (accession nos. PP101993 and PQ458469; PP350760 and PQ45545; PP409573 and PQ474679; PP746506 and PQ474680; PP375820 and PQ458468; PQ001738 and PQ458467 for JNCO1 and JNC02 respectively. NCBI BLASTn sequence analysis revealed that all sequences, except for HIS3 had 100% homology with those of the Al. alternata strain CBS 612.72 (RPB2: KP124777.1, ITS: KP124308.1, GAPDH: KP124165.1, Alt a1: KP123861.1, TEF-α: KP125084.1), meanwhile, HIS3 had 100% identity with the Al. alternata strain MRY1 (MK210171.1). Phylogenetic trees, constructed using concatenated sequences based on ITS, GAPDH, Alt a1, TEF and RPB2 genes, as well as one built solely with HIS3, both placed JNC01 and JNC02 in the Al. alternata clade with high confidence. To test pathogenicity, about 5 mL of conidia suspension (1×106 conidia/mL) of JNC01 was sprayed on five 1-year-old healthy seedlings, while five seedlings were sprayed with sterile distilled water as a control. All plants were covered with plastic bags and placed in a greenhouse at 25 ± 2℃. After 7 days, brown spots, some with chlorotic margins, were observed, similar to those observed in the field. The controls remained symptom-free. The pathogens reisolated from the diseased tissue were again identified as Al. alternata by both morphological and molecular identification based on ITS and HIS3. This study is the first report of Al. alternata causing leaf spot on Ar. stolonifera in China and provides vital information on the pathogen for further diagnosis and management of the disease.

匍匐蒿(Artemisia stolonifera, Maxim)叶斑病报道初报。在中国。
黄花蒿(Artemisia stolonifera)柯玛。也被称为“青蒿中的精英”,目前广泛种植在江西、湖北和中国其他省份。自2023年4月以来,在江西张树市33.33 ha的种植面积上发现了一种匍生木叶斑病。发病率为50% ~ 60%。不规则的黑褐色小点首先出现在叶子上,有些边缘褪绿,后来连成块状。严重者叶片完全坏死,严重影响匍匐茎的生长和品质。从20片典型症状感染叶片的坏死边缘切除3 ~ 4 mm小片,2.5%次氯酸钠溶液消毒3 min,无菌水冲洗5次,置于马铃薯葡萄糖琼脂(PDA)培养基上,25℃孵育5 d。通过菌丝尖端转移获得15株形态特征相似的纯化菌株(分离率75%)。PDA上的菌落最初是白色的,然后变成了带白色边缘的橄榄绿。在马铃薯胡萝卜琼脂培养基(PCA)上培养10 d后,分生孢子分离,颜色为浅棕色,尺寸为10.82 ~ 30.59 × 7.12 ~ 11.97 μm (n=50)。培养和形态特征与Alternaria spp. (Simmons 2007)一致,并以代表性分离株JNC01和JNC02进行进一步鉴定。为了进一步鉴定分离株,分别用引物RPB2- 5f2 /RPB2- 7cr、ITS1/ITS4、gpd1/gpd2、Alt a1- f /Alt a1- r、EF1-728F/EF1-986R和H3-1a/1b扩增RNA聚合酶II第2大亚基(RPB2)、内部转录间隔段(ITS)、甘油醛-3-磷酸脱氢酶(GAPDH)、Alternaria主要过敏原(Alt a1)、翻译伸长因子1 -α (TEF-α)和组蛋白3 (HIS3) (Glass and Donaldson 1995;Lawrence et al. 2013;Berbee et al. 1999;Hong et al. 2005)。随后的序列被存入GenBank (accession no . PP101993和PQ458469;PP350760和PQ45545;PP409573和PQ474679;PP746506和PQ474680;PP375820和PQ458468;PQ001738和PQ458467分别用于JNCO1和jnco02。NCBI BLASTn序列分析显示,除HIS3序列外,其余序列与Al. alternata菌株CBS 612.72 (RPB2: KP124777.1, ITS: KP124308.1, GAPDH: KP124165.1, Alt a1: KP123861.1, TEF-α: KP125084.1)同源性为100%,HIS3序列与Al. alternata菌株MRY1 (MK210171.1)同源性为100%。基于ITS、GAPDH、Alt a1、TEF和RPB2基因的串联序列构建的系统发育树,以及仅用HIS3构建的系统发育树,都以高置信度将JNC01和JNC02定位于Al. alternata进化支。为检测致病性,将JNC01的分生孢子悬浮液(1×106 conidia/mL)约5 mL喷洒在5株1年生的健康幼苗上,同时将5株幼苗喷洒无菌蒸馏水作为对照。所有植株用塑料袋覆盖,置于温室中,温度为25±2℃。7 d后,观察到与田间相似的褐色斑点,部分边缘有褪绿。对照组没有出现症状。从病变组织中分离的病原菌经ITS和HIS3的形态和分子鉴定再次鉴定为Al. alternata。本研究首次报道了在中国引起匍匐茎叶斑病的Al. alternata,为进一步诊断和防治该病提供了重要的病原信息。
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来源期刊
Plant disease
Plant disease 农林科学-植物科学
CiteScore
5.10
自引率
13.30%
发文量
1993
审稿时长
2 months
期刊介绍: Plant Disease is the leading international journal for rapid reporting of research on new, emerging, and established plant diseases. The journal publishes papers that describe basic and applied research focusing on practical aspects of disease diagnosis, development, and management.
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