摘要:
以10月龄扦插‘瑞香’茶[Camellia sinensis(L.)O.Kuntze cv.Ruixiang]苗为试验材料,通过沙培试验,设置5个F处理浓度(0、100、200、600、1 800mg·L-1),每周3次,处理后6周,利用LI-6400便携式光合作用测定仪进行测定。结果表明,茶树叶片的CO2同化速率、气孔导度、蒸腾速率、胞间CO2浓度、叶绿素含量等均在低浓度氟(100mg·L-1)处理时会出现较小幅度的上升而后下降;在供氟达到600mg·L-1时[叶片氟含量(2880±220)mg·kg-1],茶树开始表现出氟中毒症状,此时CO2同化速率、气孔导度、蒸腾速率显著下降,而胞间CO2浓度、水分利用率、单位面积干重等均未发生显著变化。
Abstract:
Effect of Fluoride(F)-stress on photosynthetic gas exchange parameters was studied using 10-month-old clonal plants of the tea,Camellia sinensis(L.)O.Kuntze cv.Ruixiang.The plants were grown in pots and fertilized with a nutrient solution containing 0,100,200,600or 1 800mg·L-1 F on a three times a week,24-week application.The photosynthesis characteristics of the tea leaves were determined using aportable photosynthesis system(Li-6400).The result showed that the tea leaves had increased CO2assimilation,stomatal conductance, transpiraition rate,intercellular CO2 concentration,and chlorophyll content when the F level was below 100 mg·L-1.With the F concentration increased up to 600mg·L-1,the CO2assimilation,stomatal conductance and transpiration rate decreased,but no differences in the intercellular CO2 concentration,water use efficiency or biomass.Symptoms of F-stress were apparent when the F concention was beyond 600mg·L-1(F content in the tea leaves was(2880±220)mg·kg-1.
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