Some conformities of boreal orchids underground organs formation: size and mycorrhiza formation

The negative correlation between the length of individual roots and that of entire underground system, from one side, and 1) the degree of mycorrhiza development, and 2) diameter of organs, from the other, has been shown on 14 species of boreal orchids. The positive correlation between the development of mycorrhiza and roots’ diameter was revealed. These tradeoffs reflect the importance of the varying level of orchids’ underground organs speciation to symbiosis with fungi from mycorrhizal and mycoheterotrophic associations.