Navegando por Autor "Caicedo Cepeda, Juan Carlos"
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Item Biotechnological potential of plant growth-promoting bacteria from the roots and rhizospheres of endemic plants in ironstone vegetation in southeastern Brazil.(2018) Felestrino, Érica Barbosa; Vieira, Izadora Tabuso; Caneschi, Washington Luiz; Cordeiro, Isabella Ferreira; Assis, Renata de Almeida Barbosa; Lemes, Camila Gracyelle de Carvalho; Fonseca, Natasha Peixoto; Sanchez, Angelica Bianchini; Caicedo Cepeda, Juan Carlos; Ferro, Jesus Aparecido; Garcia, Camila Carrião Machado; Carmo, Flávio Fonseca do; Kamino, Luciana Hiromi Yoshino; Moreira, Leandro MarcioMicroorganisms associated with plants have a great biotechnological potential, but investigations of these microorganisms associated with native plants in peculiar environments has been incipient. The objective of this study was to analyze the plant growth-promoting bacteria potential of cultivable bacteria associated with rare plants from the ferruginous rocky fields of the Brazilian Iron Quadrangle. The roots and rhizospheres of nine endemic plants species and samples of a root found in a lateritiric duricrust (canga) cave were collected, the culturable bacteria isolated and prospected for distinct biotechnological and ecological potentials. Out of the 148 isolates obtained, 8 (5.4%) showed potential to promote plant growth, whereas 4 (2.7%) isolates acted as biocontrol agents against Xanthomonas citri pathotype A (Xac306), reducing the cancrotic lesions by more than 60% when co-inoculated with this phytopathogen in Citrus sinensis plants. Moreover, other 4 (2.7%) isolates were classified as potential bioremediation agents, being able to withstand high concentrations of arsenite (5 mM As3+) and arsenate (800 mM As5+), by removing up to 35% and 15% of this metalloid in solution, respectively. These same four isolates had a positive influence on the growth of both the roots and the aerial parts when inoculated with tomato seeds in the soil contaminated with arsenic. This is the first time that an investigation highlights the potentialities of bacteria associated with rare plants of ferruginous rocky fields as a reservoir of microbiota of biotechnological and ecological interest, highlighting the importance of conservation of this area that is undergoing intense anthropic activityItem Potential bioinoculants for sustainable agriculture prospected from ferruginous caves of the Iron Quadrangle/Brazil.(2021) Lemes, Camila Gracyelle de Carvalho; Cordeiro, Isabella Ferreira; Fernandes, Camila Henriques de Paula; Silva, Ana K.; Carmo, Flávio Fonseca do; Kamino, Luciana Hiromi Yoshino; Carvalho, Flávia Maria de Souza; Caicedo Cepeda, Juan Carlos; Ferro, Jesus Aparecido; Moreira, Leandro MarcioBiocontrol and plant growth-promoting bacteria (PGPB) are important agricultural bioinoc- ulants. This study aimed to prospect new potential bioinoculants for a more sustainable agriculture from ferruginous caves of the Brazilian Iron Quadrangle. Culturable bacteria, from seven caves and one canga soil sample, were evaluated for biocontroller activity of the phytopathogens Xanthomonas citri subsp. Citri—Xcc306 (citrus canker), Fusarium oxysporum—Fo (fusariosis), and Colletotrichum lindemuthianum—Cl89 (bean anthracnose). The ability of the superior candidates to solubilize inor- ganic phosphate, fix nitrogen, and produce hydrolytic enzymes and siderophores was then analyzed. Out of 563 isolates, 47 inhibited the growth of Xcc306 in vitro, of which 9 reduced citrus canker up to 68% when co-inoculated with the pathogen on host plants. Twenty of the 47 inhibited Fo growth directly by 51–73%, and 15 indirectly by 75–81%. These 15 inhibited Cl89 growth in vitro (up to 93% directly and 100% indirectly), fixed nitrogen, produced proteases and siderophores, showed motility ability, produced biofilm, and all but one solubilized inorganic phosphate. Therefore, 15 (2.66%) bacterial isolates, from the genera Serratia, Nissabacter, and Dickeya, act simultaneously as biocontrollers and PGPBs, and could be important candidates for future investigations in planta as an alternative to minimize the use of pesticides and chemical fertilizers through sustainable agricultural management practices.