Sequestration of Defenses against Predators Drives Specialized Host Plant Associations in Preadapted Milkweed Bugs (Heteroptera: Lygaeinae)
Sequestration of Defenses against Predators Drives Specialized Host Plant Associations in Preadapted Milkweed Bugs (Heteroptera: Lygaeinae)
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针对捕食者的防御措施的隔离推动了预适应乳草虫（异翅目：Lygaeinae）中专门的寄主植物协会
DOI：
10.1086/719196
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Alice Exnerová
中科院分区：
文献类型：
--
作者：
Georg Petschenka;R. Halitschke;Tobias Züst;A. Roth;Sabrina Stiehler;L. Tenbusch;Christoph Hartwig;Juan Francisco Moreno Gámez;R. Trusch;Jürgen Deckert;Kateřina Chalušová;A. Vilcinskas;Alice Exnerová
植食性昆虫的寄主植物专业化差异很大，但尽管寄主植物适应的分子机制越来越为人所知，但我们往往缺乏对有利于专业化的选择力的全面了解。乳草属昆虫（异翅目：Lygaeinae）与夹竹桃科的植物有祖先关系，它们通常从夹竹桃科植物中隔离强心苷用于防御，通过抗性Na+/K+-ATP酶和适应运输、储存和排出毒素来促进。在这里，我们表明，三个Lygaeinae物种独立殖民四个新的nonapocynaceous主机收敛产生强心苷。第四个物种转移到一个新的毒素来源的耐受性和螯合生物碱从草地秋水仙（秋水仙，秋水仙科）。在三个马利筋虫物种测试，喂养种子含有毒素并没有提高生长或发育速度，甚至损害了两个物种的生长和发育，但隔离介导的保护马利筋虫对两个自然捕食者：草蛉幼虫和雀形目鸟类。我们的结论是，生理预适应和收敛植物化学促进新的专门的主机协会。由于有毒的种子并没有改善生长，但无论是受损的增长，或最多，有中性的影响，选择由捕食者隔离防御，而不是利用额外的有利可图的饮食资源，可能会导致强制性的专门主机协会，否则通才昆虫。
Host plant specialization across herbivorous insects varies dramatically, but while the molecular mechanisms of host plant adaptations are increasingly known, we often lack a comprehensive understanding of the selective forces that favor specialization. The milkweed bugs (Heteroptera: Lygaeinae) are ancestrally associated with plants of the Apocynaceae from which they commonly sequester cardiac glycosides for defense, facilitated by resistant Na+/K+-ATPases and adaptations for transport, storage, and discharge of toxins. Here, we show that three Lygaeinae species independently colonized four novel nonapocynaceous hosts that convergently produce cardiac glycosides. A fourth species shifted to a new source of toxins by tolerating and sequestering alkaloids from meadow saffron (Colchicum autumnale, Colchicaceae). Across three milkweed bug species tested, feeding on seeds containing toxins did not improve growth or speed of development and even impaired growth and development in two species, but sequestration mediated protection of milkweed bugs against two natural predators: lacewing larvae and passerine birds. We conclude that physiological preadaptations and convergent phytochemistry facilitated novel specialized host associations. Since toxic seeds did not improve growth but either impaired growth or, at most, had neutral effects, selection by predators on sequestration of defenses, rather than the exploitation of additional profitable dietary resources, can lead to obligatory specialized host associations in otherwise generalist insects.
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影响因子：
4.8
作者：
Bramer, Christiane;Friedrich, Frank;Dobler, Susanne
通讯作者：
Dobler, Susanne
DOI：
10.1098/rspb.2015.1865
发表时间：
2015-11-07
影响因子：
4.7
作者：
Petschenka, Georg;Agrawal, Anurag A.
通讯作者：
Agrawal, Anurag A.
影响因子：
6.6
作者：
Paine, C. E. Timothy;Marthews, Toby R.;Turnbull, Lindsay A.
通讯作者：
Turnbull, Lindsay A.
影响因子：
3.3
作者：
Dalla, Safaa;Dobler, Susanne
通讯作者：
Dobler, Susanne
影响因子：
1.9
作者：
Dobler, Susanne;Petschenka, Georg;Flacht, Lara
通讯作者：
Flacht, Lara