Abstract

RAMIREZ, David; NARANJO, Blanca  and  DUCHICELA, Jéssica. STIMULATION OF GERMINATION OF SPORES AND ROOT COLONIZATION OF Diversispora trimulares BY FLAVONOIDS IN Nicotiana glauca ROOT EXUDATES. rev.udcaactual.divulg.cient. [online]. 2017, vol.20, n.2, pp.341-351. ISSN 0123-4226.

Secondary metabolites are important signals that could determine the outcome of the plant soil microbial interactions, however, the data available that support the leading role of flavonoids in the communication of arbuscular mycorrhizal symbiosis are recent and limited. The present study examines the effect of flavonoids detected in root exudates from Allium porrum, Nicotiana glauca y Brassica oleracea var. italica on spore germination and mycorrhizal root colonization of Diversispora trimulares. Myricetin and kaempferol were detected in A. porrum root exudates with a total flavonoid content of 23.80µg g^-1 dried root, quercetin in N. glauca with 23,35µg g^-1 and chrysin in B. Oleracea with 14.71 µg g^-1. Quercetin increased the spore germination and vitality (24%, 40%). In contrast, chrysin showed an inhibitory effect (4%, 20%). A. porrum and N. glauca increased spore germination (54%, 56%) and root mycorrhizal colonization (72%, 75%). This results evidence the effect of flavonoids on the stimulization of spore germination and stablishment of root colonization of arbuscular mycorrhizal fungi.

Keywords : Arbuscular mycorrhiza; root exudates; flavonoids; germination; viability.

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