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-induced Changes in Guava Root Exudates Are Associated With Root Rotting Caused by . | LitMetric

-induced Changes in Guava Root Exudates Are Associated With Root Rotting Caused by .

J Nematol

Departamento de Ciências Exatas, Universidade do Estado de Minas Gerais, João Monlevade, Brazil.

Published: February 2023

AI Article Synopsis

Article Abstract

Despite the worldwide importance of disease complexes involving root-feeding nematodes and soilborne fungi, there have been few in-depth studies on how these organisms interact at the molecular level. Previous studies of guava decline have shown that root exudates from -parasitized guava plants (NP plants), but not from nematode-free plants (NF plants), enable the fungus to rot guava roots, leading to plant death. To further characterize this interaction, NP and NF root exudates were lyophilized; extracted with distinct solvents; quantified regarding amino acids, soluble carbohydrates, sucrose, phenols, and alkaloids; and submitted to a bioassay to determine their ability to enable to rot the guava seedlings' roots. NP root exudates were richer than NF root exudates in amino acids, carbohydrates, and sucrose. Only the fractions NP-03 and NP-04 enabled fungal root rotting. NP-03 was then sequentially fractionated through chromatographic silica columns. At each step, the main fractions were reassessed in bioassay. The final fraction that enabled fungal root rotting was submitted to analysis using high performance liquid chromatography, nuclear magnetic resonance, mass spectrometry, energy-dispersive X-ray fluorescence, and computational calculations, leading to the identification of 1,5-dinitrobiuret as the predominant substance. In conclusion, parasitism by causes an enrichment of guava root exudates that likely favors microorganisms capable of producing 1,5-dinitrobiuret in the rhizosphere. The accumulation of biuret, a known phytotoxic substance, possibly hampers root physiology and the innate immunity of guava to .

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10805520PMC
http://dx.doi.org/10.2478/jofnem-2023-0055DOI Listing

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