Growing poplars for research with and without mycorrhizas

Area of Science:

• Plant Science
• Mycology
• Forestry

Background:

• The genus Populus has gained importance due to genome sequencing and available molecular tools.
• Poplar species exhibit genetic variation, valuable for economic applications and understanding woody plant biology.
• Poplars are crucial for studying wood formation, stress tolerance, nutrition, and organism interactions.

Purpose of the Study:

• To describe reproducible in vitro propagation techniques for multiple poplar species.
• To detail methods for culturing ectomycorrhizal fungi and achieving ectomycorrhizal synthesis with poplars.
• To outline conditions for axenic cultivation and successful acclimatization of poplars.

Main Methods:

• In vitro propagation of Populus species (P. × canescens, P. trichocarpa, P. tremula, P. euphratica) and ectomycorrhizal fungi (Laccaria bicolor, Paxillus involutus).
• Use of specific multiplication and rooting media for plant preparation and maintenance.
• Axenic cultivation in agar and sand cultures, followed by critical hardening for ex vitro transfer.

Main Results:

• Successful in vitro propagation protocols were established for the specified poplar species and fungi.
• Ectomycorrhizal synthesis was achieved, enabling co-cultivation studies.
• Growth and vitality data were reported for poplars grown in vitro and ex vitro, with and without mycorrhizal inoculation.

Conclusions:

• Standardized in vitro propagation and co-cultivation methods are essential for reproducible research on Populus.
• These techniques facilitate studies on tree nutrition, stress response, and ectomycorrhizal symbiosis.
• Successful acclimatization protocols are key to minimizing mortality during the transition from in vitro to ex vitro conditions.