Banca de DEFESA: ANASTÁCIA PERCI CAMPOS DE ALMEIDA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ANASTÁCIA PERCI CAMPOS DE ALMEIDA
DATE: 21/08/2025
TIME: 09:00
LOCAL: videoconferência
TITLE:

Occurrence and use of arbuscular mycorrhizal fungi in hop cultivation

KEY WORDS:

Bioinputs. Humulus lupulus. Ecological soil management.

PAGES: 137
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Microbiologia e Bioquímica do Solo
SUMMARY:

This thesis investigated the role of arbuscular mycorrhizal fungi (AMF) in different hop (Humulus lupulus L.) cultivars, emphasizing the effect of fermented organic compost (FOC) on the arbuscular mycorrhizal community and plant yield with different AMF inocula. The aim was to understand how AMF can contribute to hop cultivation in tropical regions such as Brazil. The first chapter evaluated the effect of different OC doses on the occurrence and diversity of AMF in soil cultivated with Cascade hops, considering different seasonal periods coinciding with the different phenological stages of the crop: summer/vegetative (VV) and winter/dormancy (ID). Twenty-two AMF species were identified, with a predominance of the genera Glomus and Acaulospora, whose occurrence varied according to the seasonal period and phenological stage. The number of spores was significantly higher during the ID, but COF doses did not influence the AMF species composition. COF application helped maintain a suitable pH for the crop, although the high potential acidity may have interfered with the AMF community composition. This was the first study to report the occurrence of AMF species in soil with COF addition in hop cultivation, providing information for future more sustainable agricultural management. In the second chapter, the efficiency of different AMF species in the production of Comet hop plants was evaluated by comparing isolates from the collection of the Johanna Döbereiner Biological Resources Center (CRB-JD) with inoculants commercially available in Brazil. The plants were inoculated with 11 different species, and after 93 days in a greenhouse, the parameters of mycorrhizal colonization, sporulation, and development of Comet hop plants were evaluated. Despite the absence of arbuscules in the colonized roots, some species demonstrated significant beneficial effects on plant development. Species such as Acaulospora colombiana, Gigaspora candida, and Rhizophagus clarus excelled in spore production, while species such as Rhizophagus clarus, Glomus formosanum, Acaulospora foveata, Cetraspora gilmorei, and Rhizophagus intraradices excelled in root colonization. Rhizophagus clarus promoted greater shoot growth. Dentiscutata heterogama and Gigaspora margarita promoted root improvements. Overall, the CRB-JD isolates outperformed commercial inoculants. Acaulospora colombiana was the most prominent species in both cultivars. The conclusion is that AMF can be introduced into plant production to promote the sustainable development of hop cultivation in Brazil. The results presented provide a scientific basis for improving biological management practices in emerging agricultural systems and reinforce the importance of beneficial microbiota in the cultivation of plants of economic and medicinal interest.

COMMITTEE MEMBERS:
Interno - 1399485 - ANDRES CALDERIN GARCIA
Externo à Instituição - JESSÉ VALENTIM DOS SANTOS
Externo à Instituição - MARCO AURÉLIO CARBONE CARNEIRO - UFLA
Externa ao Programa - ***.566.305-** - MARIELLA CAMARDELLI UZÊDA - EMBRAPA
Presidente - 387406 - RICARDO LUIZ LOURO BERBARA