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首页> 外文期刊>Horticulturae >Improved Tolerance for Onion Thrips and Iris Yellow Spot in Onion Plant Introductions after Two Selection Cycles
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Improved Tolerance for Onion Thrips and Iris Yellow Spot in Onion Plant Introductions after Two Selection Cycles

机译：经过两个选择周期后，洋葱植物引种对洋葱蓟马和鸢尾黄斑的耐受性提高

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Iris yellow spot (IYS), a disease caused by Iris yellow spot virus (IYSV) and spread by onion thrips, is a devastating disease of onion bulb and seed production. The development of onion germplasm resistant to IYS and/or thrips is crucial to onion production, since host plant resistance is unknown for both pests. During the summer of 2010 and 2012, plants with fewer IYS disease symptoms were selected from a screening of plant introduction accessions (PIs) and first-generation selections, respectively. The resulting progeny from these selected plants were evaluated during the summers of 2013 and 2014 for thrips numbers and IYS symptom expression, and compared with their respective original PIs and a susceptible check, ‘Rumba’. The field experiment was designed such that every plant in the field screening had an equal chance of being infected with IYSV. This study shows that variation for thrips and IYS existed among PIs and first- and second-generation selections. Even though not enough progress towards minimizing IYS severity was evident from this study, we did identify several lines with improved tolerance to onion thrips in first- and second-generation selections. The majority of the selected lines exhibited lower thrips and IYS severity compared to ‘Rumba’, which suggests that the progress towards developing insect- and ultimately disease-resistant germplasm can be achieved.
机译：虹膜黄斑（IYS）是由虹膜黄斑病毒（IYSV）引起并通过洋葱蓟马传播的疾病，是洋葱鳞茎和种子生产的毁灭性疾病。抗IYS和/或蓟马的洋葱种质的发展对于洋葱的生产至关重要，因为两种害虫都不知道宿主植物的抗性。在2010年夏季和2012年夏季，分别从植物导入物（PIs）和第一代选择中筛选出具有较少IYS病状的植物。在2013年和2014年夏季，评估了这些选定植物的后代的蓟马数量和IYS症状表达，并与它们各自的原始PI和易感性检查“ Rumba”进行了比较。设计田间试验，以使田间筛选中的每株植物均具有被IYSV感染的同等机会。这项研究表明，PI和第一代和第二代选择之间存在蓟马和IYS变异。尽管从这项研究中看不出在降低IYS严重程度方面没有足够的进展，但我们确实在第一代和第二代选择中确定了几条对洋葱蓟马具有更好耐受性的品系。与“伦巴”（Rumba）相比，大多数所选系显示出较低的蓟马和IYS严重性，这表明可以实现向昆虫和最终抗病种质的发展。

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