ação do trifluralin na micorrização e crescimento de plantas de amendoim (arachis hypogaea) action of trifluralin on mycorrhization and growth of peanut (arachis hypogaea) plants
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2010
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Abstract
O amendoim (Arachis hypogaea) é uma planta que durante as fases iniciais do seu desenvolvimento sofre mais intensamente a competição das plantas daninhas, prejudicando sensivelmente sua produção. Uma forma muito eficiente de solucionar esse problema é o uso do herbicida trifluralin; no entanto, seu uso pode prejudicar a micorrização, uma associação benéfica formada por fungos e raízes da planta hospedeira. Este trabalho objetivou avaliar o efeito do herbicida trifluralin e de duas espécies de fungos micorrízicos (Gigaspora margarita e Acaulospora scrubiculata) na micorrização e no crescimento inicial de plantas de amendoim. O trabalho foi realizado na casa de vegetação do Centro de Ciências Agrárias, Ambientais e Biológicas da Universidade Federal do Recôncavo da Bahia, no município de Cruz das Almas - BA. Utilizou-se o cultivar de amendoim Vagem Lisa. Os tratamentos testados envolveram aplicação (C/H) ou não (S/H) de herbicida e inoculação individual de dois fungos micorrízicos: Gigaspora margarita (F1) e Acaulospora scrubiculata (F2), sendo os seguintes: S/H + F1, S/H + F2, C/H + F1, C/H + F2, C/H S/F (sem fungo) e S/H S/F. O delineamento experimental foi inteiramente ao acaso, em esquema fatorial (2 x 2) + 2, com quatro repetições. Os resultados mostraram que a colonização micorrízica para Gigaspora margarita foi de 63% e, quando se aplicou o herbicida, de 44%; Acaulospora scrubiculata apresentou baixo índice de colonização (5,75% e 1%, sem e com herbicida, respectivamente); a eficiência micorrízica foi superior na associação com G. margarita; a dependência micorrízica foi aumentada na presença do herbicida para as duas espécies de fungo inoculadas; a altura da planta, o volume de raízes, a massa seca da parte aérea e das raízes e a massa seca da planta foram superiores aos dos demais tratamentos. Conclui-se que o herbicida trifluralin prejudica a micorrização e o crescimento inicial das plantas de amendoim. A espécie de fungo Gigaspora margarita promove o crescimento inicial das plantas de amendoim, porém a espécie Acaulospora scrubiculata não foi eficiente para promover esse crescimento.
During their initial developmental stages, peanut (Arachis hypogea) plants suffer weed competition with more intensity, leading to severe losses. A very efficient way to solve this problem is using trifluralin; however, this herbicide can harm mycorrhization, a beneficial association formed by the host plant's fungi and roots. This work aimed to evaluate the effect of trifluralin and of two species of mycorrhizal fungi (Gigaspora margarita and Acaulospora scrubiculata) on mycorrhyzation and the initial growth of peanut plants. The experiment was carried out under greenhouse conditions at the Agricultural, Environmental and Biological Center of the Universidade Federal do Reconcavo Bahiano, in Cruz das Almas-BA, using the peanut cultivar Vagem Lisa. The treatments tested involved application (W/H) or not (WO/H) of the herbicide and individual inoculation of two mycorrhizal fungi, Gigaspora margarita (F1) and Acaulospora scrubiculata (F2), as follows: WO/H + F1, WO/H + F2, W/H + F1, W/H + F2, W/H WO/F (without the fungus) and WO/H WO/F. The experiment was arranged in a complete randomized block design in a factorial scheme (2 x 2) + 2, with four replicates. Results showed that mycorrhizal colonization for Gigaspora margarita was 63%, and 44%, when the herbicide was applied; Acaulospora scrubiculata presented low colonization index (5.75% and 1%, without and with herbicide application, respectively);mycorrhizal efficiency was superior in the association with G. margarita; mycorrhizal dependence increased in the presence of the herbicide for both the fungi species inoculated; plant height, root volume and root, with upper plant dry mass and plant dry mass being superior in comparison to the other treatments. It was concluded that the herbicide trifluralin harms mycorrhization and the initial growth of peanut plants. The fungus species Gigaspora margarita promoted the initial growth of peanut plants; however, the species Acaulospora scrubiculata was not efficient in promoting this type of growth.
During their initial developmental stages, peanut (Arachis hypogea) plants suffer weed competition with more intensity, leading to severe losses. A very efficient way to solve this problem is using trifluralin; however, this herbicide can harm mycorrhization, a beneficial association formed by the host plant's fungi and roots. This work aimed to evaluate the effect of trifluralin and of two species of mycorrhizal fungi (Gigaspora margarita and Acaulospora scrubiculata) on mycorrhyzation and the initial growth of peanut plants. The experiment was carried out under greenhouse conditions at the Agricultural, Environmental and Biological Center of the Universidade Federal do Reconcavo Bahiano, in Cruz das Almas-BA, using the peanut cultivar Vagem Lisa. The treatments tested involved application (W/H) or not (WO/H) of the herbicide and individual inoculation of two mycorrhizal fungi, Gigaspora margarita (F1) and Acaulospora scrubiculata (F2), as follows: WO/H + F1, WO/H + F2, W/H + F1, W/H + F2, W/H WO/F (without the fungus) and WO/H WO/F. The experiment was arranged in a complete randomized block design in a factorial scheme (2 x 2) + 2, with four replicates. Results showed that mycorrhizal colonization for Gigaspora margarita was 63%, and 44%, when the herbicide was applied; Acaulospora scrubiculata presented low colonization index (5.75% and 1%, without and with herbicide application, respectively);mycorrhizal efficiency was superior in the association with G. margarita; mycorrhizal dependence increased in the presence of the herbicide for both the fungi species inoculated; plant height, root volume and root, with upper plant dry mass and plant dry mass being superior in comparison to the other treatments. It was concluded that the herbicide trifluralin harms mycorrhization and the initial growth of peanut plants. The fungus species Gigaspora margarita promoted the initial growth of peanut plants; however, the species Acaulospora scrubiculata was not efficient in promoting this type of growth.
| Reference Key |
peixoto2010plantaao
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|---|---|
| Authors | ;M.F.S.P. Peixoto;V.P. Borges;V.P. Borges;C.P. Peixoto |
| Journal | anti-cancer agents in medicinal chemistry |
| Year | 2010 |
| DOI |
10.1590/S0100-83582010000300018
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| URL | |
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