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- Title
Humic-Like Water-Soluble Lignins from Giant Reed ( Arundo donax L.) Display Hormone-Like Activity on Plant Growth.
- Authors
Savy, Davide; Canellas, Luciano; Vinci, Giovanni; Cozzolino, Vincenza; Piccolo, Alessandro
- Abstract
Water-soluble humic-like lignins from energy crops had been previously shown to significantly improve plant development due to their chemical composition and supramolecular arrangement. Here, humic-like lignins isolated from Giant Reed were tested in several bioassays to verify whether the biostimulation was due to a hormone-mimic (auxin- and gibberellin-like) activity. The water-soluble lignins were applied on tomato seeds harboured with the auxin reporter DR5::GUS ( β-glucuronidase), to visualize the auxin responses in roots. Moreover, auxin- or gibberellin (GA)-mimetic activities were assessed by the Audus test on watercress and chicory seeds, respectively, with increasing concentrations of water-soluble lignin. The latter showed a significant GA-like effect, whereas it did not produce auxin-like activity at any assayed concentration. The water-soluble lignins may either directly function as GA on plant and seed development or positively perturb GA-related hormonal balances, thereby influencing GA-mediated physiological mechanisms. These findings suggest that humic-like residual lignins from energy crops may be useful in intensified sustainable agriculture as seed germination enhancers and biostimulants of plant growth.
- Subjects
PLANT growth; ORGANIC compounds; PLANT physiology; BIOMASS; BIOCHEMISTRY; REFRIGERANTS; BIOMASS energy; PLANT proteins
- Publication
Journal of Plant Growth Regulation, 2017, Vol 36, Issue 4, p995
- ISSN
0721-7595
- Publication type
Article
- DOI
10.1007/s00344-017-9696-4