Effects of Light Quality,Light Duration and Rotation on Nocturnal Movement of Oxalis triangularis'Purpurea'
The leaves of Oxalis triangularis'Purpurea'have significant nocturnal movement,which is characterized by a circadian rhythm of opening and closing.The effects of light quality,duration,and vibration on nocturnal movement of Oxalis were investigated in a climate chamber with controlled light and a time-laps camera.The results showed that light wavelength was a critical factor for the nocturnal movement pattern of Oxalis.The longer the wavelength,the faster the leaf unfolds,the shorter the wavelength,the slower the leaf closure.Under continuous light for 3 days,the leaves did not close,except that the leaves opened and closed only at 18:00 under red light.When 12 h/12 h(light/dark)photoperiod lasted for 3 days,it took 45-61 min for the leaves to unfold in the morning and 85-120 min to close completely at night.The leaves had unfolded before 8:00 AM except white light.The leaves could still unfold for 3-5 h every day under continuous dark.Horizonal rotation could change the nocturnal movement pattern of Oxalis.When the leaves were rotated at 300 r/min for 0.5-6 h,it will not close completely during rotation,only close to about 60°.The longer the rotating time,the faster the rate of leaf closure after stopping rotation.When rotation stopped after 2 h,the leaves would not close,so there was a certain range of adaptability to external stress of Oxalis.Therefore,when applying O.triangularis'Purpurea'in the garden,short-wavelength illumination could be used to extend the unfolding time of leaves,increase its ornamental effect,and avoid exposure to the sun at noon.
国家科技期刊平台
NSTL
万方数据
