| 摘要 |
［Objectives］To study the photosynthetic response mechanism of persimmon seedlings to salt stress. [Methods] The chlorophyll fluorescence parameters of Diospyros virginiana and Diospyros lotus seedlings under 4% salt stress were studied by pot culture salt control method, including the minimal fluorescence (F0), maximum fluorescence (Fm), potential activity of PS II (Fv/F0), maximum photochemical efficiency of PS II (Fv/Fm), electron transport rate (ETR), actual photochemical efficiency of PS II (YII), and photochemical quenching coefficient (qp). [Results] Under 4% salt stress, the maximum fluorescence (Fm), maximum photochemical efficiency of PS II (Fv/Fm), and photochemical quenching coefficient (qp) of two persimmon plants decreased with time. The potential activity of PS II (Fv/F0), actual photochemical efficiency of PS II (YII), and electron transport rate (ETR) decreased under salt stress. [Conclusions] This study indicates that the PS II reaction center in the persimmon leaves was damaged and the electron transport at the acceptor side was damaged under salt stress. It is expected to lay a foundation for the analysis of salt-tolerance mechanism of persimmon plants. |
