GAS-EXCHANGE AND PHOTOSYNTHESIS OF EUCALYPTUS-CAMALDULENSIS SEEDLINGS INOCULATED WITH DIFFERENT ECTOMYCORRHIZAL SYMBIONTS
GAS-EXCHANGE AND PHOTOSYNTHESIS OF EUCALYPTUS-CAMALDULENSIS SEEDLINGS INOCULATED WITH DIFFERENT ECTOMYCORRHIZAL SYMBIONTS
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DOI：
10.1007/bf00009380
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发表时间：
1992-11-01
期刊：
影响因子：
4.9
通讯作者：
HIOLHIOL, F
中科院分区：
文献类型：
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作者：
DIXON, RK;HIOLHIOL, F
赤桉幼苗接种Pisolithus tinctorius（E.A.）Coker & Couch和土生革兰（Thelephora terrestris埃赫尔.）每Fr.生长在良好浇水的土壤（PSI（s）-0.03 MPa）或经受长期土壤水分胁迫高达 1.0在温室中持续13周。13周后，将所有幼苗容器浇水至田间容量，并从E. Camaldulensis幼苗诱导短期干旱。在短期干旱前、干旱中和干旱后，对幼苗光合速率（A）、叶片气孔导度（g）和叶片水势（PSI）进行了昼夜测定。在相同的土壤体积下，染菌后的大株和小株的光合速率（A）、气孔导度和叶水势（PSI（p））与染菌后的小株相似。在短期干旱期间的terrestris。接种Pisolithus tinctorius的幼苗在短期干旱过程中保持较高的光合速率。因此，P. tinctorius ectomycorpora似乎比T.在有限的土壤水分条件下，terrestris帮助幼苗维持气体交换和光合作用。
Eucalyptus camaldulensis Dehnh. seedlings inoculated with Pisolithus tinctorius (Pers.) Coker & Couch and Thelephora terrestris Ehrl. per Fr. were grown in well watered soil (PSI(s) -0.03 MPa) or subjected to a long-term soil water stress of up to 1.0 MPa over 13-week period in a glasshouse. After 13 weeks, all seedling containers were watered to field capacity and hcn water was withheld from the E. camaldulensis seedlings to induce a short-term drought. Diurnal measurements of seedling photosynthesis rate (A), leaf stomatal conductance (g) and leaf water potential (PSI)p)) were completed before, during, and after the short term drought. Although they were growing in an equal soil volume, photosynthesis rate (A), leaf stomatal conductance and leaf water potential (PSI(p)) of larger seedlings with P. tinctorius ectomycorrhizae were similar to those of smaller seedlings colonized with T. terrestris during the short-term drought period. Seedlings inoculated with Pisolithus tinctorius maintained higher photosynthesis rates over the course of the short-term drought. Thus, P. tinctorius ectomycorrhizae appear to be more efficient than those of T. terrestris in assisting seedlings to maintain gas exchange and photosynthesis under limited soil moisture conditions.