School of Life Sciences, Keele University, Keele, UK.
Department of Plant Protection, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt.
Pest Manag Sci. 2022 Sep;78(9):3931-3938. doi: 10.1002/ps.6957. Epub 2022 May 21.
Plant resistance to insects can be reduced by crop domestication which means their wild ancestors could provide novel sources of resistance. Thus, crossing wild ancestors with domesticated crops can potentially enhance their resistance against insects. However, a prerequisite for this is identification of sources of resistance. Here, we investigated the response of three wild potato (Solanum stoloniferum Schltdl.) accessions and cultivated potato (Solanum tuberosum) to aphid (Myzus persicae Sulzer) herbivory.
Results revealed that there was a significant reduction in aphid survival and reproduction on wild potato accessions (CGN18333, CGN22718, CGN23072) compared to cultivated (Desiree) potato plants. A similar trend was observed in olfactometer bioassay; the wild accessions had a repellent effect on adult aphids. In contrast, among the tested wild potato accessions, the parasitoid Diaeretiella rapae (M'Intosh) was significantly attracted to volatiles from CGN18333. Volatile analysis showed that wild accessions emitted significantly more volatiles compared to cultivated potato. Principal component analysis (PCA) of volatile data revealed that the volatile profiles of wild and cultivated potato are dissimilar. β-Bisabolene, (E)-β-farnesene, trans-α-bergamotene, d-limonene, (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene (TMTT), and p-cymen-7-ol were the main volatiles contributing to the emitted blends, suggesting possible involvement in the behavioural response of both M. persicae and D. rapae.
Our findings show that the tested wild accessions have the potential to be used to breed aphid-resistant potatoes. This opens new opportunities to reduce the aphid damage and to enhance the recruitment of natural enemies. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
作物的驯化会降低植物对昆虫的抗性，这意味着它们的野生祖先可能为抗性提供新的来源。因此，将野生祖先与驯化作物杂交可能会增强它们对昆虫的抗性。然而，这首先需要鉴定抗性来源。在这里，我们研究了三个野生马铃薯（Solanum stoloniferum Schltdl.）品系和栽培马铃薯（Solanum tuberosum）对蚜虫（Myzus persicae Sulzer）取食的反应。
结果表明，与栽培马铃薯（Desiree）植株相比，野生马铃薯品系（CGN18333、CGN22718、CGN23072）上的蚜虫存活率和繁殖率显著降低。在嗅觉计生物测定中也观察到了类似的趋势；野生品系对成虫蚜虫具有驱避作用。相比之下，在所测试的野生马铃薯品系中，寄生蜂小菜蛾啮小蜂（Diaeretiella rapae （M'Intosh））对 CGN18333 的挥发物有明显的吸引力。挥发物分析表明，与栽培马铃薯相比，野生品系释放的挥发物明显更多。挥发物数据的主成分分析（PCA）表明，野生和栽培马铃薯的挥发物图谱不同。β-大根香叶烯、（E）-β-法呢烯、反式-α-柏木烯、d-柠檬烯、（E，E）-4,8,12-三甲基-1,3,7,11-十三碳四烯（TMTT）和对伞花烃-7-醇是形成混合物的主要挥发物，这表明它们可能参与了桃蚜和小菜蛾的行为反应。
我们的研究结果表明，所测试的野生品系有可能用于培育抗蚜虫的马铃薯。这为减少蚜虫的危害和增强天敌的招募提供了新的机会。 © 2022 作者。害虫管理科学由 John Wiley & Sons Ltd 代表化学工业协会出版。
