【摘要】 为探索白榆(Ulmus pumila)对外生菌根真菌的侵染响应，本文以白榆为宿主树种，选取3种外生菌根真菌褐环乳牛肝菌(Suillus luteus)、点柄乳牛肝菌(S. granulatus)与粘盖乳牛肝菌(S. bovinus)进行了人工菌根合成、光合及生长效应等内容的初步研究，试验用幼苗由种子萌发，分别采用固体和液体二种菌剂进行接种处理，接种后在高智能光照室持续培育90 d。接种幼苗高生长、总叶绿素含量、干旱胁迫下接种幼苗高生长效应与未接菌的幼苗指标差异显著（P<0.05）,白榆接种处理净光合速率（Pn）、光化学淬灭系数(qP)、最大光化学效率(Fv/Fm)对照CK始终明显低于3个接种处理，非光化学淬灭系数(NPQ)对照CK始终明显高于3个接种处理。由此从光合基础上证实了对幼苗接种有助于提高其适应性和抗逆性。更多还原

【Abstract】 To explore the response of Ulmus pumila to exogenous mycorrhizal fungi, taking U. pumila as host species, three ectomycorrhizal fungi, Suillus luteus, S. granulatus and S. bovinus, were selected for a preliminary study of artificial mycorrhizal synthesis, photosynthesis and growth effects. The experimental seedlings were germinated from seeds and inoculated with solid and liquid inoculants respectively. After inoculation, the seedlings were incubated in a high-intelligent light room for 90 days. Results showed that high growth, total chlorophyll content and high growth effect of inoculated seedlings under drought stress were significantly different from those of uninoculated seedlings(P<0.05). Net photosynthetic rate(Pn), photochemical quenching coefficient(qP) and maximum photochemical efficiency(Fv/Fm) of inoculated white ulmus were significantly lower than those of inoculated control CK. The non-photochemical quenching coefficient(NPQ) of CK was always significantly higher than that of the three inoculated treatments. It was proved that inoculation could improve the adaptability and stress resistance of seedlings on the basis of photosynthesis.更多还原