Аннотация:Fasciation is phenomenon in which the meristem increases in volume (in some cases - in 1000
and more). Often this process occurs by increasing the pool of stem cells in central zone. The rate of
cell division in central zone depends on cross-talking between the rib-zone and layers of tunica. The
detailed ultrastractural analysis allows us to estimate the state of central and rib-zone cells.
In our work we used two isogenic lines of pea seedlings (Pisum sativum L.): fasciated mutant
"Shtambovyj" and wild type "Nemchinovskyj." Studies realized on early stages of development (1st, 4th and 9th day of germination).