Effects of warming basal ends of Carolina poplar(Populus×canadensis Moench.) softwood cuttings at controlled low-air-temperature on their root growth and leaf damage after planting
Effects of warming basal ends of Carolina poplar(Populus×canadensis Moench.) softwood cuttings at controlled low-air-temperature on their root growth and leaf damage after planting
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控制低气温条件下卡罗莱纳杨(Populus×canadensis Moench.)软木插穗基温增温对其种植后根系生长和叶片损伤的影响
DOI：
10.1007/s10310-012-0343-4
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发表时间：
2012
影响因子：
1.5
通讯作者：
Y.
中科院分区：
文献类型：
--
作者：
Shibuya;T.;Tsukuda S.;Tokuda A.;Shiozaki;S.;Endo;R.;Kitaya;Y.
我们研究了在受控低气温下加热卡罗莱纳杨（Populus×canadensisMoench.）软木插条基端对其根系生长和种植后叶片损伤的影响。对插条进行加温处理，将切端超出10毫米的地方浸泡在温度为10℃、光合光子通量密度(PPFD)为10μmol m−2s−1(10℃光补偿点附近)的冷室中的30℃温水中，直至观察到生根。然后将加热的插条在生长室中生长，空气温度为 30°C，相对湿度为 85-90%，PPFD 为 100 µmol m−2s−1。在整个实验过程中，对照插条均在生长室中生长。无论空气温度如何，加热插条和对照插条均同时发生生根。与对照插条相比，加热插条的根发育更大，并且根据坏死程度评估的叶片损伤更小。加热插条的叶子损伤的减少可能是由于种植后水分胁迫和叶子衰老的减少，因为种植前加热处理改善了根部发育。这项技术可以改善木本植物插条的繁殖，因为它可以确保无论天气条件如何，插条都可以在碳水化合物损失最小的情况下发根。
We investigated the effects of warming the basal ends of Carolina poplar (Populus×canadensisMoench.) softwood cuttings at controlled low-air-temperature on their root growth and leaf damage after planting. The warming treatment was applied to the cuttings by soaking 10 mm beyond the cut end in warmed water maintained at 30 °C in a cold chamber maintained at an air temperature of 10 °C and a photosynthetic photon flux density (PPFD) of 10 μmol m−2s−1(near the light compensation point at 10 °C) until rooting was observed. The warmed cuttings were then grown in a growth chamber at an air temperature of 30 °C, relative humidity 85–90 %, and a PPFD of 100 μmol m−2s−1. Control cuttings were grown in the growth chamber throughout the experiment. Rooting occurred simultaneously for both warmed and control cuttings, irrespective of air temperature. Root development was greater and leaf damage, evaluated on the basis of extent of necrosis, was less for warmed cuttings than for control cuttings. The reduction of leaf damage for warmed cuttings probably resulted from reduced post-planting water stress and leaf senescence, because of improved root development as a result of the pre-planting warming treatment. This technique could improve the propagation of cuttings of woody plants, because it would ensure that the cuttings are ready to develop roots with minimum loss of carbohydrates, irrespective of weather conditions.