Seasonal variation in grapevine red blotch virus titer in relation to disease symptom expression in vineyards

IF 3.3 3区 生物学 Q2 MICROBIOLOGY Phytobiomes Journal Pub Date : 2023-10-09 DOI:10.1094/pbiomes-07-23-0076-r
Madison Flasco, Victoria Hoyle, Garner Powell, Jacob Seiter, Alice Wise, Elizabeth Cieniewicz, Marc Fuchs
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Abstract

Grapevine red blotch virus (GRBV) is the causative agent of red blotch disease. Limited information is available on the seasonal variation of GRBV titer in relation to disease symptom expression in vineyards across the United States. In this study, no statistically significant difference in GRBV titer was found among asymptomatic, infected vines in June (p=0.451) and among symptomatic, infected vines in October (p=0.068) in a diseased ‘Cabernet franc’ vineyard in California, regardless of the years symptomatic, i.e., one to seven, as shown by qPCR. Similarly, there were no statistically significant differences in GRBV titer as it relates to isolates of the two phylogenetic clades in asymptomatic, infected ‘Cabernet franc’ and ‘Cabernet Sauvignon’ vines in June (p=0.138 and p=0.778, respectively) and in symptomatic, infected vines in October (p=0.806 and p=0.490, respectively). GRBV titer differed among cultivars in diseased California vineyards (p < 0.001) and increased over the course of the growing season in infected ‘Merlot’ and ‘Cabernet franc’ vines, but not in ‘Cabernet Sauvignon’ vines. Patterns observed in California were consistent in New York and Georgia vineyards. In a Geneva double curtain-trellised ‘Cabernet Sauvignon’ vineyard in Georgia, GRBV distribution was uneven between cordons, and virus titer was variable within the vine canopy in June (p=0.017) but not in October (p=0.107). This work revealed consistent patterns of GRBV titer during a growing season in different vineyards across the United States. It also highlighted relatively high virus titer in symptomless grapevines in June when Spissistilus festinus-mediated GRBV transmission is documented in northern California.
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葡萄红斑病病毒滴度与葡萄病害症状表达的季节变化
葡萄红斑病毒(GRBV)是葡萄红斑病的病原。关于GRBV滴度与美国葡萄园疾病症状表达的季节性变化信息有限。在本研究中,在加州一个患病的品丽珠葡萄园中,不论出现症状的年份,即1年到7年,6月份无症状的感染葡萄与10月份有症状的感染葡萄之间的GRBV滴度无统计学差异(p=0.451) (p=0.068)。同样,6月份无症状的‘品丽珠’和‘赤霞珠’侵染葡萄植株和10月份有症状的侵染葡萄植株的GRBV滴度与两种系统发育分支的分离株相关(p=0.138和p=0.778), GRBV滴度无统计学差异(p=0.806和p=0.490)。GRBV滴度在患病的加州葡萄园的不同品种之间存在差异(p <0.001),在受感染的梅洛(Merlot)和品丽珠(Cabernet franc)葡萄树中,随着生长季节的推移,这种情况有所增加,但在赤霞珠(Cabernet Sauvignon)葡萄树中则没有。在加州观察到的模式与纽约和乔治亚州的葡萄园一致。在格鲁吉亚日内瓦的一个双帘架“赤霞珠”葡萄园,GRBV在围栏之间的分布不均匀,6月在藤冠内病毒滴度是可变的(p=0.017),而10月则没有(p=0.107)。这项工作揭示了GRBV滴度在美国不同葡萄园生长季节的一致模式。它还强调了6月份在无症状葡萄藤中相对较高的病毒滴度,当时在加利福尼亚北部记录了由Spissistilus festinus介导的GRBV传播。
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来源期刊
CiteScore
7.40
自引率
6.80%
发文量
42
审稿时长
4 weeks
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