Effect of Root Amount on Wind Damage in Rice

Foehn damage on rice plant is one of the important abiotic stresses in eastern costal area of Korea. To know the relationship between foehn impact and morphological traits of rice, wind tunnel method was used with 106 rice cultivars. Less influencing traits on foehn were short panicle, large panicle number per hill, thin panicle neck, and the flag leaf of narrow, short and thick. Leaf pubescence reduced the impact on foehn. `Naepung-byeo` belong-ed to foehn tolerant varietal group, while `Ansanbyeo` belong-ed to the opposite group. Three levels of root cutting treatment with two rice cultivars were conducted to evaluate the foehn impact using wint tunnel. The severity of wind damages was followed the sigmoidal curve duration of wind tunnel treatment were prolonged. Different responses of root cutting to wind tunnel treatment could be used to evaluate the severity of the foehn impact. `Naepungbyeo` was one of the less implausible cultivars on foehn. `Nae-pungbyeo` showed tolerant response to wind under 21% root removing treatment(20㎝ root cutting), however `Ansanbyeo` was wilted under the same treatment. In case of 35% root removing treatment(10㎝ root cutting), both rice cultivars failed to alive against foehn wind.