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首页> 外文期刊>Scientia horticulturae >Pathogenicity of dried-shrink disease and evaluation of resistance in a germplasm collection of sea buckthorn (Hippophae L.) from China and other countries.
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Pathogenicity of dried-shrink disease and evaluation of resistance in a germplasm collection of sea buckthorn (Hippophae L.) from China and other countries.

机译：中国和其他国家的沙棘（ Hippophae L.）种质馆藏干缩病的致病性和耐药性评估。

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摘要

Sea buckthorn (Hippophae L.) is a woody, dioecious plant that can be grown in dry and poor soil conditions. It has recently received world-wide attention as a new berry crop with a very high nutritional value and unique medicinal properties, as well as a means of combating soil erosion. A major problem is, however, dried-shrink disease (DSD), which destroys sea buckthorn plants and halts commercial production. In this study, we investigated symptoms and pathogenicity of DSD, isolated and identified pathogens using a combination of morphology and ITS sequences, and evaluated the disease index (DI) of different cultivars in the field. DSD infection causes isolated yellowing of plant tissues, and as the disease develops the bark putresces, dries and shrinks, and finally the plant dies. DSD infects older plants (>3 years), often at the plant base. Death of plant parts above the infected area does not influence root vitality, and a new plant can therefore be regenerated. Combining morphological characters and ITS sequences, we isolated and identified four fungal pathogens causing DSD, including Fusarium acuminatum, F. oxysporum, Fusarium camptoceras and Phomopsis spp. DI values for 27 cultivars ranged from 0 to 10.4. About half of the cultivars were regarded as resistant (DI <3.2) to DSD, and half as susceptible (DI >6.7). Cultivar 'Zhongguoshaji' (DI=4.2) showed an intermediate level of DSD resistance. Our data provides basic information for further studies of the mechanism of pathogenicity, and for breeding of DSD-resistant cultivars.
机译：沙棘（ Hippophae L.）是木本的雌雄异株，可以在干燥和恶劣的土壤条件下生长。它作为一种具有很高营养价值和独特药用特性以及抗水土流失的新浆果作物，最近受到了全世界的关注。但是，一个主要问题是干缩病（DSD），它会破坏沙棘植物并停止商业生产。在这项研究中，我们调查了DSD的症状和致病性，使用形态学和ITS序列相结合来分离和鉴定病原体，并评估了该领域不同品种的疾病指数（DI）。 DSD感染导致植物组织孤立的泛黄，随着疾病的发展，树皮腐烂，干燥和萎缩，最终植物死亡。 DSD经常在植物基部感染较老的植物（> 3年）。受感染区域上方植物部位的死亡不会影响根系活力，因此可以再生出新植物。结合形态特征和ITS序列，我们分离并鉴定了引起DSD的四种真菌病原体，包括尖孢镰刀菌， F。 oxysporum ， campusceras 和 Phomopsis spp。 27个品种的DI值范围从0到10.4。大约一半的栽培品种被认为对DSD具有抗性（DI <3.2），而另一半则被认为对DSD具有抗性（DI> 6.7）。品种“中果沙吉”（DI = 4.2）表现出中等水平的DSD抗性。我们的数据为进一步研究致病性机理和耐DSD的品种提供了基础信息。

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