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While there is ample evidence that herbivore\u2010induced plant responses affect individual performance and growth of herbivores, whether they scale\u2010up to regulate herbivore population dynamics is still unclear.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>We evaluated the consequences of variation in plant defences and herbivore density on herbivore development, reproduction and density\u2010dependent population growth. We investigated potential mechanisms affecting the strength of herbivore density\u2010dependent processes by manipulating jasmonate expression, quantifying plant defensive traits (phytohormones JA and SA and serine proteinase inhibitors) and adding aphids (<jats:italic>Macrosiphum euphorbiae<\/jats:italic>) at different densities to plants to simulate different initial population density and herbivore load. We manipulated jasmonate defences by using genetically modified lines of tomato plants (<jats:italic>Solanum lycopersicum<\/jats:italic>) with elevated or suppressed jasmonate\u2010dependent defences. Jasmonate\u2010insensitive plants cannot induce the defences regulated by the JA pathway, while jasmonate\u2010overexpressing plants constitutively express jasmonate\u2010dependent defences.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>We found that jasmonate defences provided resistance against aphids and influenced density\u2010dependent processes. Jasmonate\u2010overexpressing plants reduced aphid reproduction, prolonged developmental time, dampened aphid populations across all aphid densities and caused density\u2010independent aphid population growth. Jasmonate\u2010overexpressing plants showed high JA\u2010dependent constitutive levels of resistance and were unable to activate the SA pathway in response to aphid feeding. In contrast, jasmonate\u2010insensitive plants increased aphid reproduction, shortened developmental time, reduced population growth only at high initial densities and promoted strong negative density\u2010dependent population growth. Aphid feeding on jasmonate\u2010insensitive plants did not induce jasmonate\u2010dependent defences, but induced the SA pathway in a density\u2010dependent manner, which resulted in negative density\u2010dependent aphid population growth.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>Aphid feeding on jasmonate\u2010insensitive and jasmonate\u2010overexpressing plants differentially activated the salicylate pathway, revealing a negative crosstalk between the defensive phytohormones JA and SA. By muting or enhancing jasmonate\u2010mediated responses and quantifying SA phytohormone induction, we demonstrated that plant defences are a key factor driving not only the performance, but also the density dependence processes and population growth of herbivores.<\/jats:p><\/jats:list-item>\n<\/jats:list>\n<\/jats:p>","DOI":"10.1111\/1365-2656.12993","type":"journal-article","created":{"date-parts":[[2019,4,10]],"date-time":"2019-04-10T11:22:00Z","timestamp":1554895320000},"page":"1079-1088","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Constitutive and herbivore\u2010induced plant defences regulate herbivore population processes"],"prefix":"10.1111","volume":"88","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7578-2858","authenticated-orcid":false,"given":"M\u00f4nica F.","family":"Kersch\u2010Becker","sequence":"first","affiliation":[{"name":"Department of Biological Sciences The University of Alabama Tuscaloosa Alabama"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jennifer S.","family":"Thaler","sequence":"additional","affiliation":[{"name":"Department of Entomology and Department of Ecology and Evolutionary Biology Cornell University Ithaca New York"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2019,5]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.tpb.2007.09.006"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1086\/420980"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.0307-6946.2004.00635.x"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10144-005-0232-1"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00425-013-1845-9"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2664.2007.01332.x"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/0003-2697(76)"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0706.2000.890308.x"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0065-2806(03)31002-1"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1520-6327(1996)32:1<3::AID-ARCH2>3.0.CO;2-1"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1603\/0046-225X-30.1.101"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/B978-012159270-7\/50008-7"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.2307\/5130"},{"key":"e_1_2_8_15_1","unstructured":"Haukioja E. &Hakala T.(1975).Herbivore cycles and periodic outbreaks. 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