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Seleção do algodoeiro para resistência à fusariose em área onde ocorre doença semelhante em plantas de labelabe (Dolichos lablab L.) Selection of cotton plants resistant to fusarium wilt in a plot where similar disease occurs on hyacinth bean (Dolichos lablab L.)

By Imre L. Gridi-Papp, Milton G. Fuzatto, Carlos A. M. Ferraz and Edivaldo Cia

Abstract

Em área de Latossolo Roxo, localizada na Estação Experimental "Theodureto de Camargo", em Campinas, verificou-se incidência de doença provocando "murcha", com sintomas internos caracterizados pelo escurecimento dos vasos, sucessivamente em plantas de labelabe e em algodoeiro. Em ambas as espécies vegetais determinou-se a presença de fungos do gênero Fusarium, mediante isolamento feito em plantas doentes. Seleções, feitas na referida área, de plantas pertencentes a linhagem de algodoeiro suscetível à murcha de Fusariumderam origem a linhagens que revelaram apreciável resistência quando testadas em solo infestado por Fusarium oxysporum f.vasinfectum (Atk.) Snyder & Hansen. São discutidos aspectos relacionados com a possível descoberta de nova fonte genética de resistência à doença e com a existência desse fungo sob infestação natural na Estação Experimental mencionada. Também é apontada a possibilidade de serem o algodoeiro e a leguminosa em questão hospedeiras do mesmo agente patogênico.<br>The occurrence of wilt disease, successively in plants of hyacinth bean (Dolichos lablab L.) and cotton, was observed in a plot of latosolic B (Terra Roxa) soil at the "Theodureto de Camargo" Experiment Station at Campinas, where no Fusarium wilt has been recorded before. Both species presented internal symptoms consisting in darkened vessels. Fungi of the genus Fusarium were isolated from these plants. Plant selection for wilt resistance was made in the above mentioned area where a Fusarium - susceptible variety (IAG 51/1104) of cotton had been planted. The progenies when tested in soils infested by Fusarium oxysporum f. vasinfectum Atk.) Snyder & Hansen revealed fair resistance to wilt. IAG 51/1104 comes from a cross between the varieties Delfos and Delta Pineland-10, both wilt susceptible under field conditions of the State of São Paulo. It is likely that the wilt resistance of some of its progeny might have originated by recombination. It is also pointed out that the wilting agent (F. oxysporum f. vasinfectum) might occur in the "Theodureto de Camargo", Experiment Station and be responsible for the wilt in hyacinth bean and cotton plants

Topics: Agriculture (General), S1-972, Agriculture, S, DOAJ:Agriculture (General), DOAJ:Agriculture and Food Sciences, Geology, QE1-996.5, Science, Q, DOAJ:Earth Sciences, DOAJ:Earth and Environmental Sciences
Publisher: Instituto Agronômico de Campinas
Year: 1970
DOI identifier: 10.1590/S0006-87051970000100006
OAI identifier: oai:doaj.org/article:2d835c8fc3cd4212b0a7e2a161034600
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