Coinoculation of soybean plants with Bradyrhizobium japonicum and Trichoderma harzianum: Coexistence of both microbes and relief of nitrate inhibition of nodulation

Biotechnology Reports

Marina Celeste Stocco¹  Cecilia Inés Mónaco¹  Cristina Cordo¹  Aníbal Roberto Lodeiro²  Julieta Pérez-Giménez²  Esteban Tomás Iturralde²  Andrés Faura³ 

[1] CIDEFI, CIC-PBA and Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, Calles 60 y 119 (1900), La Plata, Argentina;Laboratorio de Interacciones entre Rizobios y Soja (Lirys), IBBM CCT-La Plata CONICET and Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calles 47 y 115 (1900), La Plata, Argentina;Rizobacter Argentina SA, Avda. Dr. Arturo Frondizi 1150, Parque Industrial (2700), Pergamino, Argentina;

关键词: Coinoculation;    Soybean;    Bradyrhizobium;    Trichoderma;    Nitrate;   

DOI  :  

来源: DOAJ

【 摘 要 】

Coinoculation of plants with mixtures of beneficial microbes sometimes produces synergistic effects. In this study, the effect of soybean coinoculation with the N2-fixing Bradyrhizobium japonicum E109 and the biocontrol fungus Trichoderma harzianum Th5cc was analyzed. Nodulation by E109 was not hampered by Th5cc, which antagonized five out of seven soybean pathogens tested. Furthermore, Th5cc relieved nitrate-inhibition of nodulation, enabling the formation of nodules containing infected cells with bacteroids in the presence of the otherwise inhibitory 10 mM KNO3. Th5cc released micromolar amounts of auxin, and addition of 11 μM indoleacetic acid to soybean plants inoculated with E109 in the absence of Th5cc also induced nodulation in the presence of 10 mM KNO3. Thus, Th5cc may release auxins into the soybean rhizosphere, which hormones might participate in overcoming the nitrate-inhibition of nodulation. Our results suggest that soybean plants coinoculated with these microorganisms might benefit from biocontrol while contributing to soil-nitrogen preservation.

【 授权许可】

Unknown