Interação entre porta-enxertos de citros e fungos micorrízicos arbusculares

Abstract

RESUMO -Os fungos micorrízicos arbusculares (FMA) promovem maior desenvolvimento de plantas, entretanto, a simbiose depende das espécies de ambos os simbiontes. Objetivou-se avaliar a interação entre porta-enxertos cítricos inoculados com espécies de fungos micorrízicos arbusculares. Testou-se três porta-enxertos citrangeiro 'Fepagro C37 Reck' [Poncirus trifoliata (L.) Raf. x Citrus sinensis (L.) Osbeck.], cunquateiro 'Hong-Kong' (Fortunella hindsii Swingle) e 'Trifoliata' (Poncirus trifoliata) inoculados com duas espécies de FMA (Glomus etunicatum W.N. Becker & Gerd. e Acaulospora sp.) e um tratamento não inoculado. Avaliou-se a altura (cm), o diâmetro do caule (mm), a área foliar (cm²/planta), o número de folhas, a massa fresca e seca da raiz e da parte aérea (g), o teor de reservas nos tecidos e a colonização dos FMA nas raízes. As espécies G. etunicatum e Acaulospora sp. colonizaram as raízes dos porta-enxertos, mas somente foram efi cientes para o 'Fepagro C37 Reck'. Poncirus trifoliata apresentou maior vigor em ausência de FMA. Palavras-chave: endomicorrizas, produção de mudas, simbioseABSTRACT -Interaction between rootstocks citrus and arbuscular mycorrhizal fungi. Arbuscular mycorrhizal fungi (AMF) support plant development, however, symbiosis depends on species of both symbionts. This study aimed to evaluate the interaction between rootstock citrus inoculated with species of arbuscular mycorrhizal fungi. Three rootstocks citrange 'Fepagro C37 Reck' [Poncirus trifoliata (L.) Raf. x Citrus sinensis (L.) Osbeck.], 'Hong-Kong' kumquat (Fortunella hindsii Swingle) and 'Trifoliata' (Poncirus trifoliate) were tested, inoculated with two species of AMF (Glomus etunicatum W.N. Becker & Gerd.and Acaulospora sp.) and a treatment not inoculated. We evaluated the height (cm), stem diameter (mm), leaf area (cm² / plant), leaf number, fresh and dry root and shoot weight (g), the level of reserves in tissues and the colonization of AMF in the roots. The species G. etunicatum and Acaulospora sp. colonized the roots of rootstocks, but they were only eff ective for 'Fepagro C37 Reck'. Poncirus trifoliata had the highest vigor in the absence of AMF.

Interactions between nitrogen fertilization with the growth and leaf macronutrients of citrus rootstocks

“…These results agree with those of other studies of citric rootstock production in greenhouses, where it is common to find differences between rootstocks for the evaluated variables (BACK et al, 2017;ESPOSTI;SIQUEIRA 2004;FOCHESATO et al, 2006;SORGONÁ et al, 2006). The different responses of the rootstocks can be attributed to the different genetic characteristics that influence the ability to use light and CO2, affecting the absorption, transport, and interaction of the nutrients inside the plant and consequently the vigor (SCIVITTARO et al, 2004).…”

“…In growing systems in which containers are used, the dynamics of the nutrients in the substrates are different compared with those in the soil, intensifying synergisms and antagonisms between nutrients due to the greater temperature and humidity in the system. Factors such as container type, substrate, species, variety, age, vegetal tissue (leaves, stems, and roots), and interactions between nutrients can interfere with the vegetative growth and nutritional content of citrus plants (SCIVITTARO et al, 2004;SERRANO et al, 2004;FOCHESATO et al, 2006;BACK et al, 2017).…”

Influence of arbuscular mycorrhizal fungi density on growth and metabolism of Handroanthus serratifolius (Vahl) S.O. Grose seedlings

“…However, in our study, only the spore density used for inoculation was modified, while the soil and cultural practices remained the same, resulting in no significant changes in %C (Table 2). Furthermore, despite the expected strong relationship between %C and spore density (NS), the data from our study and those found in the literature reveal that such a relationship is not consistently observed (Back et al, 2017; Santos et al, 2021).…”