Growth and physiological attributes of blueberry seedlings inoculated with arbuscular mycorrhizal fungi

• Published in: Ciência rural 2024, Vol.54 (10)
• Main Authors: Sapelli, Karla Siebert, Rusin, Carine, Sousa, Allison John de, Santos, Samuel Libani, Cristo, Fernando Braga, Resende, Juliano Tadeu Vilela de, Knob, Adriana, Botelho, Renato Vasconcelos
• Format: Article
• Language: English
• Subjects: AGRONOMY; Gigaspora rosea; Glomus clarum; IBA; peroxidase; SPAD index; superoxidedismutase
• ISSN: 0103-8478; 1678-4596; 1678-4596
• DOI: 10.1590/0103-8478cr20220059

High-quality seedlings are one of the key factors in achieving high yield and precocity of blueberries. The inoculation of arbuscular mycorrhizal fungi (AMF) can enhance the development of seedlings in the nursery, ensuring more vigorous seedlings in a shorter time. This study evaluated the effect of inoculation of arbuscular mycorrhizal fungi on the development of ‘PowderBlue’blueberryseedlings. The treatments were arranged in a 4 x 2 factorial scheme, in which the first factor was the arbuscular mycorrhizal fungi Gigaspora rosea, Glomus clarum, G. rosea + G. clarum, and a control level without mycorrhizae, while the second factor consisted of usingindole-3-butyric acid(IBA) and a control level without IBA. Semi-hardwood cuttings were planted in pots containing sterilized soil and kept in a greenhouse for 660 days. The percentage of rooted cuttings, plant height, root system length, shoot dry mass, root dry mass, total dry mass, peroxidase (POD) and superoxide dismutase (SOD) enzyme activities, SPAD index, mycorrhizal efficiency and dependence, number of spores, and soil basal respiration were evaluated. Plants inoculated with G. clarum without IBA and inoculated with G. rosea with IBA showed higher dry matter and SOD and POD enzyme activities, but the use of IBA had a negative effect on the fungus. The inoculation of blueberry cuttings with G. clarummay help seedlingdevelopment, thus improving biometric and biochemical parameters. Furthermore, the plant regulator IBAwas essential in establishing the symbiosis between blueberry and the AMF G. rosea. RESUMO: Um dos fatores primordiais para alcançar alta produtividade e precocidade de mirtileiros é o emprego de mudas de alta qualidade. A inoculação de fungos micorrízicos arbusculares (FMA) pode potencializar o desenvolvimento de plântulas no viveiro, garantindo mudas mais vigorosas e em menor espaço de tempo. O estudo objetivou avaliar o efeito da inoculação de fungos micorrízicosarbusculares no desenvolvimento de mudas de mirtileiro cv. Powderblue. Os tratamentos utilizados foram arranjados em um esquema fatorial 4 x 2, sendo o primeiro fator os diferentes fungos micorrízicos arbusculares G. rosea, G. clarum, G. rosea + G. clarum e um nível controle sem micorrizas, o segundo fator foi com uso de AIB e um nível controle sem AIB. Estacas semi-lenhosas foram plantadas em vasos contendo solo esterilizado, mantidos em casa de vegetação durante 660 dias. A porcentagem de estacas enraizadas, altura de plantas, co