关键词: 葡萄砧木, 盐胁迫, 叶绿素, 光合特性, 荧光参数

Abstract: In order to explore the response mechanism of grape (Vitis sp.) rootstocks to salt stress, one-year potted cuttings of 101-14M (V. riparia×V. rupestris, resistant to salt stress) and 188-08 (V. berlandieri × V. riparia, sensitive to salt stress) were irrigated with 0, 4, 6, 8 and 10 g·kg-1 of NaCl solution, and changes of chlorophyll content, photosynthetic gas exchange and chlorophyll fluorescence parameters were studied. The results showed that: with increasing NaCl concentration, net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr) decreased significantly, and the maximal fluorescence (Fm), potential photochemical efficiency of PSⅡ (Fv/Fm), maximum quanta yield (Yield) and photochemical quenching coefficient (qP) showed a decreasing trend , while instantaneous fluorescence emission (F0), non-photochemical quenching coefficient (NPQ) and chlorophyll content increased first and then decreased. These results demonstrated that the decrease of chlorophyll contents instead of stomatal limitation mainly caused photosynthesis reduction of 188-08 when NaCl concentration was 6 g·kg-1, and PSⅡ was impaired severely when NaCl concentration was 8 g·kg-1. However, chlorophyll restrictions mainly caused photosynthesis Ⅱ reduction of 101-14M when the concentration of NaCl reached to 8 g·kg-1, and PSⅡ damage of 101-14M occurred when concentration of NaCl came up to 10 g·kg-1.

Key words: grape rootstock, salt stress, chlorophyll, photosynthesis, fluorescence parameters