Abstract:

Effect of NO3- on the ChlorophyⅡ Fluorescence of the meizhao/colt under waterlogging were studied .The results show that with the increase of waterlogging, (Fv/Fm )、 Fv/Fo and (qP) had the trend of decrease –increase-decrease. Exogenously applied NO3- alleviated the decrease of Fv/Fm 、 Fv/Fo and qP. qN on The treatment of NO3- were higher than CK. The light energy conversion efficiency, and potential activity of photosynthetic reaction center and the non-photochemical dissipation of excess light enemy, which resisted the damage on photosynthetic apparatus of environmental stress, were improved.