土壤水分胁迫对槟榔幼苗叶绿素荧光动力学参数的影响

Effects of Different Water Stress on Chlorophyll Fluorescence Parameters of Areca catechu L.Seedling

以海南长蒂种槟榔幼苗为供试材料,通过控制土壤相对含水量,设置5个土壤水分胁迫水平的单因子盆栽试验,研究土壤水分胁迫程度对槟榔幼苗叶绿素荧光动力学特性的影响。结果表明,长期、持续处于土壤水分胁迫会抑制槟榔幼苗的PSⅡ原初光能转化效率,光合电子传递能力、PSⅡ的光化学活性,PSⅡ潜在活性和PSⅡ潜在光合作用活力。土壤相对含水量≤30%,槟榔幼苗不能持续进行有效的热耗散,但具有较高的热耗散能力。其PSⅡ反应中心会出现不易逆转的破坏。其伤害部位可能位于PSⅡ氧化传递链或PSⅡ反应中心或PSⅡ原初电子受体。

The effects of soil water stress on the chlorophyll fluorescence parameters of Hainan areca seedlings were studied,by using a pot experiment with five different soil water contents in this paper.The results showed that the Areca catechu L.Seedlings were in the long-term state of water stress would inhibit the betel nut seedlings＇ PSⅡ primary light energy conversion efficiency,photosynthetic electron transport capacity,PSⅡ photochemical activity,PSⅡ potential photosynthetic activity and PSⅡ potential energy.Soil relative water content ≤30%,betel nut seedlings could not be sustained for effective heat dissipation,but with a higher heat dissipation capacity.Betel nut seedlings PSⅡ reaction center would be difficult to reverse the damage.The injuried sites may be located in PSⅡ oxide transport chain or PSⅡ reaction center or the original PSⅡ electron acceptor.