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Melhoramento genético do arroz para resistência a doenças usando raios gama
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ISBN10: 6208081769
ISBN13: 9786208081768
Publisher: Edicoes Nosso Conhecimento
Published: Sep 13 2024
Pages: 84
Weight: 0.30
Height: 0.20 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208081768
Publisher: Edicoes Nosso Conhecimento
Published: Sep 13 2024
Pages: 84
Weight: 0.30
Height: 0.20 Width: 6.00 Depth: 9.00
Language: Portuguese
As doenças do arroz são um dos principais factores limitantes da produção de arroz em todo o mundo, especialmente as doenças do mÃldio (Magnaporthae grisea) e da bakanae (Fusarium moniliforme). Por conseguinte, este estudo foi realizado com o objetivo de melhorar a resistência do arroz ao mÃldio e à s doenças de bakanae, bem como o rendimento e as caraterÃsticas relacionadas com o rendimento, utilizando raios gama e marcadores moleculares. Os grãos de arroz foram irradiados com diferentes doses de raios gama (150, 200, 250, 300 Gy). Onze mutantes de arroz foram selecionados e avaliados quanto à sua resistência à s doenças do blast e da bakanae em condições de infeção natural e artificial. Apenas nove mutantes eram resistentes a ambas as doenças ou a uma delas. O rastreio molecular dos genes de resistência (R) à s doenças do blast e da bakanae foi realizado para os mutantes selecionados e para os seus progenitores utilizando marcadores moleculares. Os resultados mostraram que os mutantes resistentes ao mÃldio têm uma combinação de genes de resistência parcial e completa que conferem uma resistência duradoura a todas as raças de mÃldio. Por conseguinte, os marcadores moleculares são ferramentas poderosas para aumentar a eficácia da seleção nos programas de melhoramento. Além disso, o melhoramento por mutação é uma abordagem muito eficaz para desenvolver novos genótipos resistentes à doença da explosão e da bakanae no arroz.
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