干旱胁迫下接种ERM真菌对桃叶杜鹃幼苗光合特性的影响

以1年生桃叶杜鹃幼苗为材料,研究干旱胁迫下接种ERM真菌对桃叶杜鹃幼苗光合特性的影响.结果表明:接种ERM真菌显著提高了桃叶杜鹃幼苗的叶绿素含量、净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)以及水分利用效率(WUE),同时降低了叶片胞间CO2浓度(C,),对照不接菌处理差异显著;在持续干旱条件下,桃叶杜鹃菌根苗通过促进叶片叶绿素的合成与积累,提高水分的利用效率,以减缓幼苗各光合参数的下降速度,使幼苗保持较高的光合能力;复水后,菌根苗能较快恢复其光合作用,恢复能力显著高于对照苗,且TY 35和TY 29基本能恢复至旱前水平.由此可见,接种ERM真菌能够显著提高桃叶杜鹃幼苗的光合能力以及水分利用效率,从而增强桃叶杜鹃的抗旱能力,且以TY 35和TY 29的表现最好.

The Effects of Inoculation with ERM Fungi Under Drought Stress on Photosynthetic Characteristics of Rhododendron annae Franch.Seedlings

The seedlings of 1 a Rhododendron were used as materials,to study the effects of ERM fungi on the photosynthetic characteristics of Rhododendron fortunei seedlings under drought stress.The results showed that the chlorophyll content (Chl),net photosynthetic rate (Pn),transpiration rate (Tr),stomatal conductance (Gs) and water use efficiency (WUE) of Rhododendron fortunei seedlings were significantly increased by inoculation with ERM fungi.While reducing the intercellular CO2 concentration (Ci),Compared with non-inoculation treatment,the difference was obvious.Under the condition of continuous drought,the rhizome of Rhododendron fortunei increased the utilization efficiency of water by promoting the synthesis and accumulation of chlorophyll in leaves,to slow down the decline of photosynthetic parameters of seedlings,so that seedlings maintain a high photosynthetic capacity;After rewatering,mycorrhizal fungi could restore their photosynthetic centers faster,and the recovery ability was significantly higher than that of control seedlings,and TY 35 and TY 29 could recover to the pre-drought level.It can be seen that inoculation of ERM fungi can significantly improve the photosynthetic capacity and water use efficiency of Rhododendron fortunei seedlings,so as to enhance the drought resistance of Rhododendron fortunei,and TY 35 and TY 29 has the best performance.