Symbiotic vs. asymbiotic seed germination in epiphytic orchids

Acta Agronómica

Otero Ospina, Joel Tupac²  Bayman, Paul¹ 

[1] Universidad de Puerto Rico, San Juan;Universidad Nacional de Colombia Sede Palmira, Palmira, Colombia

关键词: Tolumnia variegata;    Epidendrum ramosum;    Lepanthes rupestris and Psychilis monensi;    Orchidaceae;    germination;    mycorrhizal fungi Introducción Desde los trabajos pioneros de Knudson (1921);    los horticultores han germinado las semillas de orquídeas mediante la utilización de combinaciones de nutrientes en condiciones estériles (Arditti 1992);   

DOI  :  

学科分类：农业科学（综合）

来源: Universidad Nacional de Colombia * Facultad de Ciencias Agropecuarias Palmira

【 摘 要 】

We compared seedling growth of the epiphytic orchid, Tolumnia variegata in agar media with and without inoculated mycorrhizal fungi. Symbiotic germination produced more-developed embryos than asymbiotic germination. Differences were highly significant, although some isolates of Rhizoctonia-like fungi were parasitic on seeds. Control seeds in a cellulose medium without Rhizoctonia-like fungi did not germinate. Seeds of Epidendrum ramosum, Lepanthes rupestris and Psychilis monensis showed no significant differences between asymbiotic and symbiotic germination using mycorrhizal fungi isolated from T. variegata roots, suggesting high mycorrhizal specificity. Our data suggest that the relationship between epiphytic orchids and the mycorrhizal fungi is more specific than previously thought. The use of the right fungal strain may enhance germination performance. Orchid growers may achieve better results in the propagation of some epiphytic orchids using symbiotic germination.

【 授权许可】

CC BY-NC-SA