水翁(Cleistocalyx operculatus)幼苗对淹水的反应初报

研究了水翁在生理和形态上对3个月淹水期的反应。在潮湿或淹水条件下水翁能存活并保持一定的净光合速率和生长速率，全淹条件下存活期为60d，水翁对淹水的适应包括：（1）淹和的茎部产生肥大皮孔和不定根，（2）不定根系的活力比正常根系的活力高，有不定根的植株的气孔传导率和蒸腾速率比没有不定根的植株高得多。水翁是一种耐淹植物，可在河岸、库岸等水位波动地区种植。

Preliminary studies on responses of the seedlings of Cleistocalyx operculatus to flooding

Several physiological and morphological responses to flooding of the seedlings of C.operculatu were studied.The seedlings of C.operculatu were survived and maintained certain net photosynthetic rate and growth rate in humid or drowned conditions,and survived 60 days of complete submersion.Adaptations of the seedlings of C.operculatu to flooding were indicated by(1) formation of hypertrophied lenticels and adventitious roots (AR) on the submerged stem,(2)higher vigor of AR system than that of normal root system and much higher transpiration rate and stomatal conductance in seedlings with AR than those in seedlings without AR. C.operculatu is tolerant of flooding,and it could be planted along river banks and reservoir banks where water levels fluctuate.