What does the axis in a seed do​

Water uptake is one of the initial steps during seed germination. Subsequently, the radicle and embryo axis elongate (Bewley, 1997). Because the initial steps and cell elongation require high rates of water flow into the cells, a role of plant aquaporins during germinatoin was anticipated (Maurer, 1997).

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.