【摘要】 为探究不同种类浓度的植物生长调节剂在低温条件下对茶叶光合特性的影响。本试验以‘桃源大叶’（TY）和‘储叶齐’（CY）为试验材料，探讨在低温条件下喷施不同植物生长调节剂对茶树光响应曲线、叶片净光合速率（Pn）、气孔导度（Gs）、细胞间CO₂浓度（Ci）、蒸腾速率（Tr）、饱和蒸汽压（VpdL）、叶片瞬间水分利用率（WUE）、气孔限制值（LS）的影响。试验结果表明：5种生长调节剂对‘桃源大叶’和‘储叶齐’的抗寒能力均有不同程度的提高，其中TY处理组在低温下喷施植物生长调节剂对茶叶的影响排名依次为C₂>D₃>D₁>C₃>E₂>A₁>E₁>B₂>B₁>C₁>A₂>D₂>B₃>A₃>E₃>CK，其中C₂、D₃的综合排名最高，分别是0.875和0.833,3个主成分的累计贡献率为93.931%；而CY处理组在低温下喷施植物生长调节剂对茶叶的影响排名依次为C₂>A₂>D₁>B₂>B₁>E₃>A₁>B₃>D₂>C₃>C₁>E₁>E₂>D₃>A₃>CK，其中C₂、A₂的综合排名较高，分别是0.753和0.713,3个主成分的累计贡献率为89.108%。在低温下喷施调节剂可以提高Pn、Gs、Ci、Tr，降低LS，为提高茶叶的抗寒性奠定了基础。更多还原

【Abstract】 To investigate the effects of different concentrations of plant growth regulators on the photosynthetic characteristics of tea under low temperature conditions,‘Taoyuan Big Leaf’（TY） and‘Storage Leaf Qi’（CY）were used as experimental materials to explore the effects of spraying different plant growth regulators under low temperature conditions on the light response curve, leaf net photosynthetic rate（Pn）, stomatal conductance（Gs）, intercellular CO₂ concentration（Ci）, transpiration rate（Tr）, saturated vapor pressure（VpdL）, leaf instantaneous water use efficiency（WUE）, and stomatal limit value（LS） of tea trees. The experimental results showed that the five growth regulators improved the cold resistance of‘Taoyuan Big Leaf’and ’Storage Leaf Qi’ to varying degrees. Among them, the TY treatment group had the effects ranking of C₂>D₃>D₁>C₃>E₂>A₁>E₁>B₂>B₁>C₁>A₂>D₂>B₃>A₃>E₃>CK when spraying plant growth regulators on tea at low temperatures, and C₂ and D₃ had the highest comprehensive ranking, with 0.875 and 0.833 respectively, the cumulative contribution rate of the three principal components is 93.931%. The ranking of the effects of spraying plant growth regulators on tea in the CY treatment group at low temperatures was C₂>A₂>D₁>B₂>B₁>E₃>A₁>B₃>D₂>C₃>C₁>E₁>E₂>D₃>A₃>CK, and C₂ and A₂ were ranking higher, with 0.753 and0.713 respectively, and the cumulative contribution rate of the three principal components is 89.108%.Spraying regulators at low temperatures can increase Pn, Gs, Ci, Tr, and reduce LS, laying the foundation for improving the cold resistance of tea.更多还原