Root growth characteristics of Festuca, Lolium and Festulolium in relation to stress tolerance

  • Alvydas ŠIMKŪNAS
  • Sandra VALAŠINAITĖ
  • Izolda PAŠAKINSKIENĖ

Anotacija

Linear root growth of meadow fescue (Festuca pratensis Huds.), Italian ryegrass (Lolium multiflorum Lam.) and their hybrid Festulolium braunii was studied under a hardening temperature of +4 °C. It was defined, that the root growth rate of Festuca pratensis was considerably lower than that of Lolium multiflorum (vF .<< vL.). The cytological growth analysis suggests that the main reason for the lower root growth rate of Festuca pratensis, compared to Lolium multiflorum, was a low cell production rate (VF.< VFl.< VL.). Festulolium braunii took the intermediate but closer to Lolium multiflorum position within these parameters. An exceptionally short root elongation zone L of Festuca pratensis was the result of a low cell production rate. We sugest that the low cell production rate V as a consequence of low meristem activity is a cytological expression of growth slowdown and a stress state into which plants transit and in such a way express stress tolerance. Thus, a short root elongation zone L can be a marker of a stress state and cold resistance. Keywords: Festuca pratensis, Lolium multiflorum, Festulolium braunii, root linear growth, cell production rate, stress tolerance, stress state, rounded cells
Publikuotas
2007-01-01
Skyrius
Straipsniai