{"id":11274,"date":"2008-05-06T00:00:00","date_gmt":"2008-05-06T04:00:00","guid":{"rendered":"http:\/\/www.farmchemicalsinternational.com\/2008\/05\/06\/chinese-scientists-locate-key-rice-gene\/"},"modified":"2019-09-16T13:53:39","modified_gmt":"2019-09-16T17:53:39","slug":"chinese-scientists-locate-key-rice-gene","status":"publish","type":"post","link":"https:\/\/www.agribusinessglobal.com\/pt\/markets\/chinese-scientists-locate-key-rice-gene\/","title":{"rendered":"Cientistas chineses localizam gene-chave do arroz"},"content":{"rendered":"

Um relat\u00f3rio recente indica que pesquisadores chineses podem ter descoberto um gene evasivo no arroz que desempenha um papel fundamental no potencial de colheita da cultura, de acordo com Not\u00edcias do Yahoo!<\/a>.<\/p>\n

O estudo, descrito na revista Gen\u00e9tica da Natureza<\/a>, observou que a produtividade de uma planta de arroz \u00e9 determinada por v\u00e1rias caracter\u00edsticas \u2014 o n\u00famero e o tamanho dos seus gr\u00e3os; a altura da planta; e seu tempo de flora\u00e7\u00e3o, que reflete sua resposta ao clima predominante.<\/p>\n

Anos de trabalho anteriores em pesquisa de arroz ajudaram os cientistas a se aproximarem do cromossomo 7 da planta para um gene que parece afetar todas essas tr\u00eas caracter\u00edsticas, o que o artigo descreve como "a sequ\u00eancia m\u00e1gica".<\/p>\n

O gene foi identificado por uma equipe liderada por Qifa Zhang, da Universidade Agr\u00edcola de Huangzhong<\/a> em Wuhan. Sua equipe plantou 30.000 plantas de arroz na tentativa de rastrear o gene. Os plantios iniciais foram reduzidos a 1.082 plantas que apresentaram baixa produtividade, pois tinham gr\u00e3os menores e em menor quantidade, eram baixas e floresciam mais cedo. Descobriu-se que a culpada pelos problemas de produtividade era a aus\u00eancia de um gene chamado Ghd7.<\/p>\n

Quando o Ghd7 foi aplicado nessas plantas retardat\u00e1rias, as caracter\u00edsticas de produtividade foram transformadas. O tempo de flora\u00e7\u00e3o dobrou e as plantas ficaram quase dois ter\u00e7os mais altas. Os pesquisadores ent\u00e3o registraram o funcionamento do Ghd7 em 19 diferentes variedades de arroz origin\u00e1rias de toda a \u00c1sia, desde o Jap\u00e3o, no norte, at\u00e9 as Filipinas, Mianmar e \u00cdndia, no sul. Eles encontraram cinco muta\u00e7\u00f5es diferentes no gene-chave.<\/p>\n

Vers\u00f5es menos ativas ou inativas de Ghd7 foram encontradas em arroz cultivado em regi\u00f5es mais frias. Essas muta\u00e7\u00f5es estimularam a planta a florescer mais cedo, permitindo assim que fosse cultivada em \u00e1reas com esta\u00e7\u00e3o de crescimento curta e clima temperado.<\/p>","protected":false},"excerpt":{"rendered":"

Um relat\u00f3rio recente indica que pesquisadores chineses podem ter descoberto um gene evasivo no arroz que desempenha um papel fundamental\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":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[5],"tags":[],"class_list":["post-11274","post","type-post","status-publish","format-standard","hentry","category-markets"],"yoast_head":"\nChinese Scientists Locate Key Rice Gene - AgriBusiness Global<\/title>\n<meta name=\"description\" content=\"A recent report indicates that Chinese researchers may have uncovered an elusive gene in rice that plays a key role in the crop's harvest potential,\" \/>\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\/markets\/chinese-scientists-locate-key-rice-gene\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chinese Scientists Locate Key Rice Gene - 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