To elucidate the mechanisms governing the salt tolerance of the endangered semi-mangrove plant Barringtonia racemosa, the biomass, photosynthetic and fluorescent characteristics, and anatomical structure of B. racemosa were studied under low, medium and high salt stress. The results showed that the stem dry weight, net photosynthetic rate, intercellular CO₂ concentration, Fv/Fm, and ΦPSI of B. racemosa decreased under high salt stress, which led to a significant reduction in total dry weight. Stem dry weight was significantly positively correlated with the thickness of palisade tissue and significantly negatively correlated with the thickness of the epidermis of roots and xylem of stems. Therefore, a stable net photosynthetic rate and intercellular CO₂ concentration, an increase in Fv/Fm and ΦPSI, an increase in or stable palisade tissue and spongy mesophyll of leaves and an increase in xylem thickness of the stem and epidermis, outer cortex, and stele diameter of roots could contribute to the salt tolerance of B. racemosa.

为阐明濒危半红树植物小玉蕊的耐盐机制，对低、中、高盐胁迫下小玉蕊的生物量、光合和荧光特性以及解剖结构进行了研究。结果表明，高盐胁迫下总状白桦的茎干重、净光合速率、胞间CO ₂浓度、Fv/Fm和ΦPSI均下降，导致总干重显着减少。茎干重与栅栏组织厚度呈显着正相关，与根表皮和茎木质部厚度呈显着负相关。因此，净光合速率和细胞间CO ₂浓度稳定，Fv/Fm和ΦPSI增加，叶片的栅栏组织和海绵叶肉增加或稳定，茎和表皮、外皮层的木质部厚度增加，根的柱径可能有助于B. racemosa的耐盐性。