Lignin degradation products from corn stalks enhance notably the radial growth of basidiomycete mushroom mycelia
Milled corn stalk (crude) was cleaned by diverse solvents (cleaned). When 1000 ppm of cleaned was added to Peptone / Glucose / Agar (PGA), the growth rate of Pleurotus ostreatus and Pleurotus sajor-caju was doubled. The mycelial diameter also increased by a supplementation of a hot water extract of cleaned corresponding to 1000 ppm, which was composed of 400 µg / g-stalk of nonvolatile compounds including 60 µg / g-stalk of phenolic monomers. An IR spectrum of the extract was very similar to that of cleaned and commercial lignin. Supplementation of crude or cleaned to Malt extract / Sucrose / Agar (MSA) promoted mycelial growth by 30 % in all five basidiomycete studied. A commercially available Kraft lignin supplemented to MSA showed cleaned-like growth promotions. The hot water extract showed growth promotion to the mycelia at a range of 10−6−10−7 M as seen in plant hormones. Therefore, we suggest these fungi use the enzymatic degradation products of lignin as a signal to faster mode of growth. This must be an important tactic of the fungi in securing their niche by degrading a vegetal biomass before competitors encroach upon it.
| Main Authors: | , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedad Química de México A.C.
2001
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| Online Access: | http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S0583-76932001000200007 |
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