WATERLOGGING TOLERANCE OF ROOTS OF SITKA SPRUCE CLONES AND OF STRANDS FROM THELEPHORA-TERRESTRIS MYCORRHIZAS
WATERLOGGING TOLERANCE OF ROOTS OF SITKA SPRUCE CLONES AND OF STRANDS FROM THELEPHORA-TERRESTRIS MYCORRHIZAS
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DOI：
10.1139/x90-254
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发表时间：
1990-12-01
期刊：
影响因子：
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通讯作者：
NICOLL, BC
中科院分区：
文献类型：
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作者：
COUTTS, MP;NICOLL, BC
锡特卡云杉（Picea sitchensis (Bong.)） 3个无性系扦插的研究)生长在2米高的透明丙烯酸泥炭管中，在室外的绝缘盒中。许多树木的根与土象菌形成菌根；在管中可以看到基质外菌丝体和相关的链，以及根。一些试管浸水以淹没根和菌丝系统的下部。在根系生长缓慢的10月或生长停止的11月进行涝灾。真菌菌丝体在两种情况下都在生长。次年3月，将试管排干，测定主要根和真菌的存活率至再生点。两种涝渍处理在根系存活方面存在较大差异。10月的内涝造成了大量的枯死，根系存活到地下水位平均仅122毫米深。11月涝渍导致枯死较少，成活深度308 mm。无性系间根系存活率差异有统计学意义，但差异不大。在两种处理下，土孢霉的基质外菌丝均死亡，但所有菌丝系统均存活并在第二年春天再生。讨论了影响生存的因素，包括根和真菌股的生长和氧运输。
Rooted cuttings of three clones of Sitka spruce (Picea sitchensis (Bong.) Carr.) were grown in 2 m tall transparent acrylic tubes of peat in insulated boxes out of doors. Roots of many of the trees formed mycorrhizas with Thelephora terrestris Ehrh.:Fr.; the extra-matrical mycelium and associated strands were visible in the tubes, together with the roots. Some of the tubes were waterlogged to submerge the lower part of the root and mycelial systems. Waterlogging was carried out in October, when roots were growing slowly, or in November, when growth had stopped. The fungal mycelium was growing on both occasions. The tubes were drained in the following March, and survival of main roots and fungus was measured to the point of regeneration. There were large differences between the two waterlogging treatments in root survival. October waterlogging caused substantial dieback, and roots survived to a mean depth of only 122 mm below the water table. November waterlogging resulted in little dieback, and survival depth was 308 mm. Differences between clones in root survival were statistically significant but small. The extra-matrical hyphae of T. terrestris died in both treatments, but all of the strand systems survived and regenerated in the following spring. Factors affecting survival are discussed, including growth and oxygen transport in roots and fungal strands.