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首页> 外文期刊>Acta Horticulturae >Root cold tolerance of three temperate zone Viburnum species
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Root cold tolerance of three temperate zone Viburnum species

机译：三个温带区荚膜的根冷容耐热性

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Freeze damage to roots of container-grown nursery stock occurs when substrate temperatures dip below a root cold tolerance (RCT) threshold and plants may not recover if a large proportion of the roots are damaged. In this study, we used an electrolyteleakage test to compare damage to immature roots of three Viburnum species frequently used in landscapes in the northeastern USA. There were five test dates using the same source of container-grown plant material during the winter months between February 2014 and March 2016. Excised root samples in vials were submerged in a programmed recirculating glycol bath with minimum temperature treatments of 0, -5, -10, -15, -20, or -25°C. Distilled water was added to each vial when removed from the glycol bathand initial electrical conductivity (ECi) was measured on the solution after 24 h of storage at 2-3°C. Vials were then autoclaved and final electrical conductivity (ECf) was measured 24 h later. The ECi/ECf ratio represented the proportion of total electrolyte leakage caused by the minimum temperature treatments. The RCT is the predicted temperature at which 50% damage occurred. Previous researchers assigned thresholds of -7 and -9°C for immature roots of Viburnum plicatum van tomentosum and Viburnumcarlesii, respectively. Our results were similar for V. plicatum van tomentosum (RCT -6°C) but showed V. carlesii roots could tolerate lower minimum temperatures (RCT -11.5°C). In fact, V. carlesii roots were nearly as cold tolerant as Viburnum opulusvan americanum (RCT -13.5°C), a plant hardy to USDA cold hardiness zone 2, for which RCT values had not previously been reported. Viburnum carlesii and V. plicatum van tomentosum are zone 4-5 plants. This study confirms that root and shoot cold hardiness are not always well-correlated.
机译：当基板温度下降到根冷耐受（RCT）阈值和植物时，冻结容器生长的苗圃库存损坏的损坏发生在阈值和植物的大部分损坏时可能无法恢复。在这项研究中，我们使用了电解质额外试验来比较常用于美国东北部的景观中的三种荚膜的未成材根源的损坏。在2014年2月和2016年3月之间的冬季使用相同的集装箱种植植物材料来源的五个测试日期。瓶子中的切除根样品被淹没在编程的再循环乙二醇浴中，其最小温度处理为0，-5， - 10，-15，-20或-25°C。当从乙二醇浴中除去时，将蒸馏水加入每个小瓶中，在2-3℃下储存后，在溶液中测量初始电导率（ECI）。然后将瓶子高压灭菌和最终导电性（ECF）以后测量。 ECI / ECF比率表示由最低温度处理引起的总电解质泄漏的比例。 RCT是预测温度，发生了50％的损坏。以前的研究人员分别为荚莲属Plicatum van tomentosum和viburnumcarlessii的未成无状根而分配-7和-9°C的阈值。我们的结果类似于Plicatum van tomentosum（RCT -6°C），但显示V.Carlesii Roots可容忍更低的最低温度（RCT -11.5°C）。事实上，V.Carlesii根部几乎是耐寒性，因为荚膜Opulusvan Americanum（RCT -13.5°C），USDA冷硬度区2的植物耐寒地，以前没有报道RCT值。 Viburnum Carlesii和V.Plicatum Van Tomentosum是4-5株植物。本研究证实根本和射击冷硬度并不总是完全相关的。

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