Investigations of the capacity and strength of seed germination in Allium victorialis L

摘要

The aim of the study was to examine the strength and energy of seed germination in Allium victorialis. Despite the normal structure of seeds containing a viable embryo and compliance with all International Seed Testing Association recommendations, no germination in A. victorialis was observed. Additionally, the scarification and stratification treatments applied did not improve the dynamics of germination of A. victorialis seeds. Microbiological analyses of soil sampled from natural localities of the plant revealed a typical composition of bacteria and fungi. The high number of fungi [4.5 log_(10)CFU (colony forming units) of fungi × g~(-1) dry mass of soil] and various groups of bacteria (about 7.0 log_(10)CFU of bacteria × g~(-1) dry mass of soil) were detected in the root-free-soil around garlic roots. In the interior of A. victorialis roots, the number of microorganisms decreased 1000 to 10 000 times but all the tested microbial groups, especially copiotrophic bacteria and fungi (1.6 and 2.2, respectively, log_(10)CFU × g~(-1) dry mass of roots) were detected. Changes in such parameters as dehydrogenase activity, pH values, and the total organic C (TOC) content in the particular parts of the rhizosphere and in comparison to the rhizosphere with root-free-soil were observed. The dehydrogenase activity and TOC content were highly positively correlated with the total number of CFU of the microorganisms.