melhoramento das variedades paulistas de algodão. criação da iac 13-1 improvement of the são paulo cotton varieties origin and breeding of iac 13-1
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ID: 200500
1975
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Abstract
A variedade de algodoeiro IAC 13-1 foi desenvolvida a partir da linhagem norte-americana Acala 5675, conhecida como uma "Acala Oriental", a qual foi selecionada de material primitivo colhido no México. Dadas as boas qualidades da sua fibra, essa linhagem foi objeto de estudos, na Seção de Algodão do Instituto Agronômico, desde a sua introdução. Após nove anos de aclimatação e seleção individual, foi isolada a linhagem IAG 61/60 como material promissor. Desenvolveu-se a IAC 13-1 a partir dessa linhagem por seleção genealógica, no período de 1961 a 1970. A sua semente foi entregue em 1968, pela primeira vez, para multiplicação em campo básico. A IAC 13-1 substitui a IAC 12-2, na lavoura, a partir de 1970, tendo maior produtividade, melhor capulho, maior semente, melhor fibra e maior produção em terrenos infestados porFusarium oxysporumf.vasiniectum(Atk) Snyder e Hansen.
The origin and breending of the São Paulo cotton variety IAC 13-1, as well as the involved proceedings and numerical results are reported. The "eastern Acala" Acala 5675, selected at Knoxville, Tenn., from a Mexican cotton was introduced to São Paulo in 1950. It showed very good fiber qualities in the new environment. After nine years of acclimation and individual selection it yielded a promising line named IAG 61/60. IAC 13-1 was developped from this line by the general pedegree selection process adopted in breeding for final genetic balance by the Cotton Section of the Instituto Agronômico. The first stock of genetic seed was released for further increase in 1968. IAC 13-1 substituted the commercial variety IAC 12-2. This substitution signified an improvement in yield, type and size of bolls, size of seeds, fiber qualities and behaviour in areas contaminated by Fusarium oxysporum f. vasinfectum (Atk.) Snyder et Hansen.
The origin and breending of the São Paulo cotton variety IAC 13-1, as well as the involved proceedings and numerical results are reported. The "eastern Acala" Acala 5675, selected at Knoxville, Tenn., from a Mexican cotton was introduced to São Paulo in 1950. It showed very good fiber qualities in the new environment. After nine years of acclimation and individual selection it yielded a promising line named IAG 61/60. IAC 13-1 was developped from this line by the general pedegree selection process adopted in breeding for final genetic balance by the Cotton Section of the Instituto Agronômico. The first stock of genetic seed was released for further increase in 1968. IAC 13-1 substituted the commercial variety IAC 12-2. This substitution signified an improvement in yield, type and size of bolls, size of seeds, fiber qualities and behaviour in areas contaminated by Fusarium oxysporum f. vasinfectum (Atk.) Snyder et Hansen.
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| Authors | ;Popílio A. Cavaleri;Imre L. Gridi-Papp;Carlos A. M. Ferraz;Milton G. Fuzatto;Edivaldo Cia;Nélson M. da Silva;Oswaldo O. S. Neves;Nélson P. Sabino;José F. Lazzarini;Edmur S. Martinelli;Francisco A. Corrêa |
| Journal | revista espanola de salud publica |
| Year | 1975 |
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