Contribution of ectomycorrhiza to the potential nutrient‐absorbing surface of pine
Contribution of ectomycorrhiza to the potential nutrient‐absorbing surface of pine
复制标题
外生菌根对松树潜在营养吸收表面的贡献
DOI：
10.1111/j.1469-8137.1994.tb04028.x
复制
发表时间：
1994
期刊：
影响因子：
9.4
通讯作者：
A. Fox
中科院分区：
文献类型：
--
作者：
J. Rousseau;D. Sylvia;A. Fox
摘要
火炬松(Pinus taeda L.)对外生菌根发育所产生的幼苗进行了量化。在一次实验中。在一项实验中，火炬松幼苗被接种了Pisolitus tinctorius Pers。在低磷(P)营养条件下，第一次从种子中生长8wk后，焦化(铂)。接种8周后，收获幼苗，并对营养吸收系统的所有成分(包括真菌菌丝体)进行定量。外生菌丝体只占潜在吸收系统干重的5%，但这个菌丝体占潜在吸收系统面积的75%，吸收长度的99%以上。在第二个实验中，比较了铂的磷吸收和对潜在吸收表面的贡献与地球嗜地盲肠球菌Fr。(CG)。接种铂的幼苗与接种对照的苗木的不同之处在于：(1)它们对磷的吸收几乎是对照的两倍；(2)细根分枝的频率更高；(3)根形形成广泛的网络；(4)菌丝吸收表面积是对照的1.5倍以上，菌丝长度是对照的3倍以上。我们的结论是，对于接种了铂和CG的植物，外生菌丝体对松树幼苗的总潜在吸收表面积的贡献最大。菌丝总表面积和菌丝长度的差异可能是接种PT和CG的苗木吸收磷的差异的原因。
summary
The increase in potential nutrient-absorbing surface area of loblolly pine (Pinus taeda L.) seedlings as a result of ectomycorrhizal development was quantified. In one experimental. In one experiment, loblolly pine seedlings were inoculated with Pisolithus tinctorius Pers. Coker (Pt) after having first been grown from seed for 8 wk under a low phosphorus (P) nutrient regime. Eight weeks following inoculation, seedlings were harvested and ail components of the nutrient absorbing system (including the fungal mycelium) were quantified. External mycelium accounted for only 5% of the potential absorbing-system dry weight, but this mycelium comprised 75% of the potential absorbing system area and over 99% of the absorbing length. In a second experiment, the P uptake and contribution to potential absorbing surface of Pt was compared to Cenococcum geophilum Fr. (Cg). Seedlings inoculated with Pt differed from those inoculated with Cg in that they (i) absorbed almost twice the P. (ii) had a higher frequency of fine-root branching, (iii) developed an extensive network of rhizomorphs, and (iv) had over 1.5 times the mycelial absorbing surface area and over 3 times the mycelial length of Cg. We conclude that for both Pt and Cg inoculated plants, external mycelium made by far the greatest contribution to the overall potential absorbing surface area of the pine seedling. Differences in total mycelial surface area and mycelial length may account for differences in P uptake between seedlings inoculated with Pt and those inoculated with Cg.