Evaluation of Drought Tolerance of Pleurospermum camtschaticum, Cirsium setidens and Parasenecio firmus Obtained from Pressure-Volume Curves

This study was carried out to establish a proper cultivation site and diagnose the drought tolerance of Pleuro- spermum camtschaticum, Cirsium setidens and Parasenecio firmus leaves by using pressure-volume curves. The result of Ψo sat and Ψo tlp were lower in Pleurospermum camtschaticum leaves. On the other hand, it appeared that Emax of Pleurospermum camtschaticum was approximately six times higher than that of Parasenecio firmus. The values of RWC tlp is all above 88% showing that the function of osmoregulation is somewhat better, and Vo/DW, Vt/DW, Ns/DW of Pleurospermum camtschati- cum leaves were approximately 2~4 times Lower than other ones. Thus, responses to water relations of Pleurospermum camtschaticum, Cirsium setidens and Parasenecio firmus such as Ψo sat , Ψo tlp , Emax, ΨP, max, RWC tlp were shown that the Pleuro- spermum camtschaticum leave was higher drought tolerance than Cirsium setidens and Parasenecio firmus leaves.