Desenvolvimento de mudas de mirtileiro inoculadas com fungos micorrízicos arbusculares

Abstract

RESUMO -O objetivo deste trabalho foi avaliar o efeito da inoculação de fungos micorrízicos arbusculares (Glomus clarum Nicolson e Schenck, Glomus etunicatum Becker e Gerd, Gigaspora margarita Becker e Hall e Scutellospora heterogama Nicolson e Gerd) em mudas micropropagadas de mirtileiro da cultivar Woodard. O delineamento experimental utilizado foi o de blocos casualizados, com cinco tratamentos, quatro repetições por tratamento e seis plantas por parcela. As plantas inoculadas com G. margarita apresentaram maior altura e biomassa seca das raízes. Os tratamentos com S. heterogama e G. margarita apresentaram os maiores resultados para a biomassa verde das raízes. O desempenho foi relacionado com as taxas de colonização das raízes que, nas plantas inoculadas com G. margarita e S. heterogama, foram de 48,2 e 45,1%, respectivamente. Para os teores nutricionais, as plantas inoculadas com S. heterogama, G. etunicatum, G. clarum e G. margarita proporcionaram maiores teores de N e P na parte aérea das plantas. Termos para indexação: Micropropagação, Vaccinium sp., endomicorrizas, crescimento. DEVELOPMENT OF SEEDLINGS OF BLUEBERRY INOCULATED ARBUSCULAR MYCORRHIZAL FUNGIABSTRACT -The objective of this study was to measure the effect of inoculation with arbuscular mycorrhizal fungi (Glomus clarum Nicolson and Schenck, Glomus etunicatum Becker and Gerd, Gigaspora margarita Becker and Hall and Scutellospora heterogama Nicolson and Gerd) in seedlings of blueberry cultivars Woodard. The experimental design was a randomized block with five treatments, with four plots per treatment and six plants per plot. Plants inoculated with G. margarita showed greater height and dry weight of roots. The treatments with S. heterogama and G. margarita showed the highest results for the green biomass of roots. The performance was related to the rate of colonization of roots, plants inoculated with G. margarita and S. heterogama, were 48.2 and 45.1%, respectively. For the nutritional contents, plants inoculated with S. heterogama, G. etunicatum, G. clarum and G. margarita provided higher levels of N and P in the shoots.

Absorption of nutrients by soursop seedlings in response to mycorrhizal inoculation and addition of organic compost1

“…At higher doses, treatments with AMF inoculation did not differ from the control treatment. Similar results were reported for Gigaspora magarita and Glomus clarum inoculation by Samarão et al (2011) and Farias et al (2014), respectively in blueberry and soursop seedlings. Silva et al (2017b) reported that the A. colombiana inoculation provided an increase of 2,400 % in the P content, in relation to the control, in Australian cedar seedlings.…”

“…Santos et al (2011) reported that the Glomus etunicatum inoculation also provided significant N increases in the shoots of pineapple seedlings. N increments were also reported by Farias et al (2014), in blueberry seedlings. The contribution of AMF to increased nitrogen uptake may reach 25 %, as a function of the ability to grow beyond the depletion zone that forms near the surface of absorbing roots (Siqueira et al 2002).…”

ARBUSCULAR MYCORRHIZAL FUNGI IN SEEDLING FORMATION OF BARBADOS CHERRY (Malpighia emarginata D.C.)

“…Several studies have indicated the beneficial effects of AMF inoculation in fruit seedlings, such as blueberry, olive and pitanga (brazilian cherry) (FARIAS et al, 2014;FERREIRA et al, 2015;DALANHOL et al, 2016). Mango seedlings inoculated with AMF presented rooting after 5-6 months with a colonization rate of 50% for subsequent grafting process (RAMANATHAN et al, 2016).…”

Advances in the spread of vegetative blueberry

“…The concentration of 50 mg L -1 of GA 3 is enough to obtain response of blueberry plants as to their growth (PELIZZA et al, 2010a). The influence of arbuscular mycorrhizal fungi (AMF) in the production of micro propagated seedlings of blueberry cultivars Bluegem and Woodard (FARIAS et al, 2014) were evaluated, preceded by the tests of how to isolate and identify these fungi from the orchards in Southern region -RS (FARIAS, 2012). Soil and root samples have been collected in commercial and experimental blueberry orchards from the municipalities of Pelotas, Morro Redondo, and Jaguarão and used ecological indices as the way to evaluate the populations in the orchards under study and the analysis of main components to evaluate the physical and chemical attributes of the soil in relation to the AMFs.…”

“…Among the soil chemical parameter, there were high correlation of AMF species with pH, volume (%), phosphorus and sand variables (FARIAS, 2012). The AMFs isolates for the production of seedlings were provided by the species bank of the Horticulture and Forestry Department of UFRGS (FARIAS et al, 2014). Four species of AMFs (Glomus clarum, Glomus etunicatum and Scutellospora heterogama and Gigaspora margarita) were tested on the seedlings production of cultivars Woodard and Bluegem.…”