浸水對百香果幼株生長與形態之影響

Effect of Waterlogging on Growth in Passion Fruit Seedlings (Passiflora edulis f. flavicarpa Deg.)

黃色百香果（Passiflora edulis f. flavicarpa Deg）實生苗在根部浸水4-6日後，地上部之生長即受到抑制，繼而會造成葉柄上偏生長（epinasty），葉片老化，落葉，莖基部腫大，鬆裂，生出點狀白色鬆軟組織，並長出不定根。根系的生長在浸水1日後即受到抑制，短期浸水使根的生長量減少；中等程度浸水時，影響側根的發生及原有細根的生長，長時間浸水者，原有根系完全遭受破壞，須由莖與根基部或水面以上部分長出不定根，來取代原有根系。

When potted passion fruit seedlings wore flooded to a level 3cm over the surface of the medium, their root growth was significantly inhibited. The growth rate of the roots began to slow down even when they were waterlogged for only 1 day. After being waterlogged for 8 days, moot of the laterial roots ceased to grow. After 20 days, the root system was totally destroyed and a new root system formed at the base of the stem to provide a shallow root aystem. Waterlogging also retarded leaf extension and shoot growth, and caused leaf chlorosis, petiole epinasty, stem hypertrophy and the formation of adventitious roots.