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以西北地区主栽枸杞品种宁杞一号和美洲引进枸杞属植物Lycium exsertum为试验材料,采用伤根接种法接种尖镰孢菌(Fusarium oxysporum),对其叶绿体色素含量、光合作用参数和叶绿素荧光动力学特征的变化进行了研究。结果表明:接种F.oxysporum后,宁杞一号和L.exsertum的叶绿体色素含量均降低,但宁杞一号降低速度更快;宁杞一号净光合速率、蒸腾速率、气孔导度和水分利用率大幅下降,而L.exsertum的变化幅度显著小于宁杞一号,与对照基本一致;宁杞一号最大光量子效率(Fm/Fv)、实际光量子效率(ΦPSⅡ)、开放中心捕捉效率(Fm′/Fv′)和光化学猝灭效率(qP)大幅下降,非光化学猝灭效率(NPQ)大幅上升,而L.exsertum波动幅度较小,与对照变化相似。L.exsertum叶绿体色素含量、光合作用参数和叶绿素荧光特性受F.oxysporum影响显著小于宁杞一号,维持了较高的光合效率和电子传递速率,对F.oxysporum引起的根腐病有较强的抵抗能力。
Lycium exsertum, a Chinese wolfberry variety planted in northwestern China and Lycium exsertum introduced in the Americas, were used to inoculate Fusarium oxysporum with wound-root inoculation, and their chlorophyll contents, photosynthesis parameters and chlorophyll fluorescence Dynamic characteristics of the changes were studied. The results showed that chlorophyll content of Ningqi No.1 and L.exsertum decreased after F. oxysporum inoculation, but Ningqi No.1 decreased more rapidly. Net photosynthetic rate, transpiration rate, stomatal conductance and water content of Ningqi No.1 The rate of change of L.exsertum was significantly less than that of Ningqi No.1, which was basically the same as that of the control. The maximum quantum efficiency (Fm / Fv), actual photon efficiency (ΦPSⅡ), open center capture efficiency (Fm ’/ Fv’) and photochemical quenching efficiency (qP) decreased sharply, NPQ increased significantly while L. exsertum fluctuated less, which was similar to the control. The chlorophyll pigment content, photosynthesis parameters and chlorophyll fluorescence of L. exsertum were significantly less affected by F. oxysporum than that of Ningqi No.1, maintained high photosynthetic efficiency and electron transfer rate, and had a strong effect on root rot caused by F.oxysporum Resilience.