Article (Scientific journals)
In vitro model to study the biological properties of humic fractions from landfill leachate and leonardite during root elongation of Alnus glutinosa L. Gaertn and Betula pendula Roth.
Tahiri, Abdelghani; Destain, Jacqueline; Thonart, Philippe et al.
2015In Plant Cell, Tissue and Organ Culture, 122 (3), p. 739-749
Peer reviewed
 

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Keywords :
humic substances; landfill leachates; leonardite; Betula pendula Roth; Alnus glutinosa L. Gaertn
Abstract :
[en] Humic substances (HS) are organic compounds resulting from the physical, chemical and microbiological transformations of organic residues. Our study aims to determine the main biological properties of HS comparing landfill leachate (LHS) source to a stable formulation extracted from leonardite (HHS), and using an in vitro system of root development from shoot and leaf explants of silver birch (Betula pendula Roth) and black alder (Alnus glutinosa L. Gaertn). Results showed that both explants of both species rooted closely to 100% when cultivated in absence of HS. The incorporation of HS or their fractions into the culture medium affect root growth, mainly lateral roots formation and primary root length. Applied at low concentration (10 ppm) HS stimulated especially primary root growth. But at high concentration (100 ppm), LHS inhibited root formation of alder, while birch was more tolerant. The application of 100 ppm of HHS, did not affect alder root growth but increased root growth in birch. Humic acids fractions (HA) were favorable and improved root growth while, fulvic acids (FA) and other molecules (OM) decreased significantly root growth, especially those extracted LHS. The root inhibition expressed at high LHS concentration may be due to the presence of different toxic molecules and root growth inhibitors in OM and FA fractions and that some of them remained in the OM fraction from leonardite.
Disciplines :
Agriculture & agronomy
Biotechnology
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Tahiri, Abdelghani ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Destain, Jacqueline ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Bio-industries
Thonart, Philippe ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Bio-industries
Druart, Philippe;  CRAW > Sciences du vivant > Génie biologique
Language :
English
Title :
In vitro model to study the biological properties of humic fractions from landfill leachate and leonardite during root elongation of Alnus glutinosa L. Gaertn and Betula pendula Roth.
Alternative titles :
[fr] Modèle in vitro pour étudier les propriétés biologiques des fractions humiques de lixiviat de décharge et de léonardite durant l'allongement des racines d'Alnus glutinosa L. Gaertn et de Betula pendula Roth.
Publication date :
16 June 2015
Journal title :
Plant Cell, Tissue and Organ Culture
ISSN :
0167-6857
eISSN :
1573-5044
Publisher :
Springer Science & Business Media B.V., Dordrecht, Netherlands
Volume :
122
Issue :
3
Pages :
739-749
Peer reviewed :
Peer reviewed
Available on ORBi :
since 18 August 2015

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