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      Interação entre micorrizas arbusculares e ácido giberélico no desenvolvimento vegetativo de plantas de citrange carrizo Translated title: Effect of arbuscular mycorrhizae and gibberelic acid interaction on vegetative growth of carrizo citrange seedlings

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          Abstract

          As plantas cítricas são, geralmente, dependentes dos fungos micorrízicos arbusculares (FMA). Há relatos indicando a existência de um intercâmbio hormonal entre as plantas e os FMA e também a comprovação de que a simbiose planta-FMA é beneficiada pela aplicação radicular de auxinas. Com o objetivo de verificar se esta interação também ocorre com outros grupos de fitorreguladores, submergiu-se, por 10 segundos, o sistema radicular de plântulas de citrange Carrizo (Citrus sinensis (L.) Osb. X Poncirus trifoliata (L.) Raf.), previamente inoculadas, ou não, com Glomus intraradices Schenck & Smith, em uma solução de 10ppm de ácido giberélico (AG3). Após sete meses de cultivo em casa de vegetação, verificou-se que os FMA incrementaram o desenvolvimento vegetativo do citrange Carrizo, além de provocarem um aumento nos níveis foliares de P, Zn e Cu e induzirem a um decréscimo no conteúdo de Ca, Mg, Fe e Mn nos tecidos. Os FMA não afetaram os níveis foliares de N e K. O AG3 somente aumentou o diâmetro do colo das plantas, não modificando sua altura, peso seco da parte aérea e raízes, número de folhas e superfície foliar. O AG3 incrementou os níveis de P e Fe nos tecidos foliares, reduziu os teores de K e não modificou os teores dos demais nutrientes. O AG3 não alterou a colonização radicular com FMA. No entanto, verificou-se uma interação positiva e significativa entre os FMA e o AG3 sobre o desenvolvimento vegetativo das plantas de citrange Carrizo, indicando que o AG3 favorece a simbiose, permitindo uma redução no período de produção da muda.

          Translated abstract

          Citrus plants generaly depend on arbuscular mycorrhizal fungi (AMF). There are several reports indicating interaction between hormones and AMF. It has also been proven that plant and AMF symbiosis benefits from auxin aplication to roots. The present study had the objective to determine if plant-hormone interaction occurred with hormone groups other than auxins. Mycorrhizal and nonmycorrhizal Carrizo citrange (Citrus sinensis (L.) Osb. X Poncirus trifoliata (L.) Raf.) root systems were submerged for 10 seconds in a 10ppm gibberelic acid (GA3) solution. AMF increased the vegetative growth of Carrizo citrange seedlings as well as P, Zn and Cu leaf contents. Mycorrhizal seedlings had lower Ca, Mg, Fe and Mn concentrations in leaves than nonmycorhizal seedlings, while N and K concentrations were not affected by AMF. GA3 treated seedlings had a bigger trunk diameter but the treatment did not increase seedling height, dry weight, leaf number and leaf area per plant. GA3 treatment also resulted in increased levels of P and Fe in the leaves, reduced K leaf contents but had no effect on other nutrients and did not affect root colonization by AMF. Moreover, the interaction between AMF and GA3 had a significative effect on Carrizo citrange vegetative growth, indicating that GA3 favored plant-AMF symbiosis.

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          Most cited references23

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          THE COLORIMETRIC DETERMINATION OF PHOSPHORUS

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            Improved nitrogen uptake and transport from15N-labelled nitrate by external hyphae of arbuscular mycorrhiza under water-stressed conditions

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              Mycorrhiza in a Sustainable Agriculture

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                Author and article information

                Journal
                cr
                Ciência Rural
                Cienc. Rural
                Universidade Federal de Santa Maria (Santa Maria, RS, Brazil )
                0103-8478
                1678-4596
                October 2000
                : 30
                : 5
                : 783-787
                Affiliations
                [01] Porto Alegre RS orgnameUniversidade Federal do Rio Grande do Sul orgdiv1Departamento de Horticultura e Silvicultura
                Article
                S0103-84782000000500007 S0103-8478(00)03000507
                860ea30e-65ff-41c4-8c6f-8370605dc1d5

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 27 November 1998
                : 15 March 2000
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 24, Pages: 5
                Product

                SciELO Brazil

                Categories
                Fitotecnia

                growth regulators,citrus,endomycorrhizal fungi,reguladores de crescimento,citros,endomicorrizas

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