{"id":13795,"date":"2009-03-23T00:00:00","date_gmt":"2009-03-23T04:00:00","guid":{"rendered":"http:\/\/www.farmchemicalsinternational.com\/2009\/03\/23\/new-green-fungicides-use-plants-natural-defenses\/"},"modified":"2019-09-16T13:47:28","modified_gmt":"2019-09-16T17:47:28","slug":"new-green-fungicides-use-plants-natural-defenses","status":"publish","type":"post","link":"https:\/\/www.agribusinessglobal.com\/pt\/industry-news\/new-green-fungicides-use-plants-natural-defenses\/","title":{"rendered":"Novos fungicidas \u201cverdes\u201d usam as defesas naturais das plantas"},"content":{"rendered":"

Cientistas canadenses apresentar\u00e3o uma nova classe de fungicidas \u201cverdes\u201d em 23 de mar\u00e7o em Salt Lake City, Utah, na 237\u00aa Reuni\u00e3o Nacional da americano
Sociedade Qu\u00edmica<\/a>, relat\u00f3rios Ci\u00eanciaDi\u00e1ria<\/a>. Os novos fungicidas exploram uma estrat\u00e9gia \u00fanica de defesa vegetal de interromper uma via de sinaliza\u00e7\u00e3o qu\u00edmica chave usada pelos fungos para quebrar as defesas normais de uma planta. As plantas aumentam suas defesas naturais e superam o ataque f\u00fangico, dizem os
pesquisadores, cujo estudo foi financiado por Conselho de Pesquisa em Ci\u00eancias Naturais e Engenharia do Canad\u00e1 <\/a>e o Universidade de Saskatchewan<\/a>.<\/p>\n

Os novos fungicidas \u2014 chamados \u201cpaldoxinas\u201d \u2014 foram desenvolvidos com a agricultura sustent\u00e1vel em mente, substituindo pesticidas convencionais e ajudando a combater o crescente problema de resist\u00eancia. Os novos fungicidas seletivamente param fungos que causam doen\u00e7as de plantas sem prejudicar outros organismos ou causar efeitos ambientais adversos, dizem os pesquisadores. Eles podem ser aplicados como pesticidas convencionais.<\/p>\n

\u201cFungicidas convencionais matam constantemente\u201d, explica a l\u00edder do estudo Soledade Pedras, Ph.D., professora de qu\u00edmica na Universidade de Saskatchewan. \u201cNossos produtos s\u00f3 atacam o fungo quando ele est\u00e1 se comportando mal ou atacando a planta. E por esse motivo, eles s\u00e3o muito mais seguros.\u201d<\/p>\n

As plantas t\u00eam um mecanismo de defesa que envolve a produ\u00e7\u00e3o de produtos qu\u00edmicos naturais chamados fitoalexinas para matar fungos causadores de doen\u00e7as. Ao lutar, o fungo libera enzimas que desintoxicam ou destroem a fitoalexina, deixando a planta vulner\u00e1vel ao ataque do fungo. Pedras e seus colegas propuseram o desenvolvimento de novos agentes antif\u00fangicos para bloquear a destrui\u00e7\u00e3o de fitoalexinas pelos fungos. Eles denominaram esses novos agentes paldoxinas, abrevia\u00e7\u00e3o de fitoalexina
inibidores de desintoxica\u00e7\u00e3o.<\/p>\n

\u201cDescobrimos que muitos fungos n\u00e3o conseguiam degradar esse produto qu\u00edmico\u201d, diz Pedras. \u201cEnt\u00e3o foi isso que usamos para projetar vers\u00f5es sint\u00e9ticas que eram ainda mais fortes do que o original.\u201d<\/p>\n

Os pesquisadores agora desenvolveram seis vers\u00f5es sint\u00e9ticas diferentes das paldoxinas, que, segundo Pedras, poder\u00e3o ser comercializadas dentro de alguns anos.<\/p>","protected":false},"excerpt":{"rendered":"

Cientistas canadenses apresentar\u00e3o uma nova classe de fungicidas \u201cverdes\u201d em 23 de mar\u00e7o em Salt Lake City, Utah, na 237\u00aa\u2026<\/p>","protected":false},"author":110,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[489],"tags":[],"class_list":["post-13795","post","type-post","status-publish","format-standard","hentry","category-industry-news"],"yoast_head":"\nNew "Green" Fungicides Use Plants' Natural Defenses - AgriBusiness Global<\/title>\n<meta name=\"description\" content=\"Canadian scientists will present a new class of "green" fungicides March 23 in Salt Lake City, Utah, at the 237th National Meeting of the American\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.agribusinessglobal.com\/pt\/industry-news\/new-green-fungicides-use-plants-natural-defenses\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New "Green" Fungicides Use Plants' Natural Defenses - 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