Atmospheric nitrogen dioxide at ambient levels stimulates growth and development of horticultural plants
Atmospheric nitrogen dioxide at ambient levels stimulates growth and development of horticultural plants
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DOI：
10.1139/b07-129
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发表时间：
2008-02
期刊：
影响因子：
1.1
通讯作者：
Suaad E. H. Adam;Jun Shigeto;A. Sakamoto;Misa Takahashi;H. Morikawa
中科院分区：
文献类型：
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作者：
Suaad E. H. Adam;Jun Shigeto;A. Sakamoto;Misa Takahashi;H. Morikawa
我们最近发现，大气中的二氧化氮（NO2）在环境水平作为一个信号，以烟草plumbaginifolia Viviani，使这些植物的生物量和所有的细胞内容物增加一倍。在此，我们讨论了NO2的这种效应是否也在各种园艺植物中观察到。生菜（Lactuca sativa L.），向日葵（Helianthus annuus L.），黄瓜（Cucumis sativus L.），和南瓜（Cucurbita moschata Duch.）ex Lam.）分别在50、200、100和200 mLL-1的空气中培养5-6周，空气中补充稳定同位素标记的（15 N）NO2。对照植物在没有NO2（<5 mLL-1）的情况下生长。所有的植物都用非标记的硝酸盐灌溉。与在没有NO2的情况下生长相比，NO2的存在使向日葵的地上和地下生物量增加了一倍，而生菜、黄瓜和南瓜的地上生物量仅增加了一倍。在“NO2增强”生长过程中，莴苣每枝的碳（C）、氮（N）、磷（P）、钾（K）、钙（Ca）和镁（Mg）含量几乎增加了一倍，但其他植物没有增加。15 N/ 14 N的质谱分析表明，只有很小比例（0.2%-14%）的植物总氮来自NO2，这意味着外源NO2作为一个信号，而不是
We recently discovered that atmospheric nitrogen dioxide (NO2) at ambient levels acts as a signal to Nicotiana plumbaginifolia Viviani, causing these plants to double both their biomass and all of the cell contents. Herein, we ad- dressed whether this effect of NO2 is also observed in various horticultural plants. Lettuce (Lactuca sativa L.), sunflower (Helianthus annuus L.), cucumber (Cucumis sativus L.), and pumpkin (Cucurbita moschata Duch. ex Lam.) were grown with 50, 200, 100, and 200 mLL -1 , respectively, of air supplemented with stable isotope-labelled ( 15 N) NO2, for 5-6 weeks. Control plants were grown without NO2 (<5 mLL -1 ). All plants were irrigated with nonlabelled nitrate. The presence of NO2 doubled both the aboveground and belowground biomass in sunflowers compared with their growth in the absence of NO2, whereas lettuce, cucumber, and pumpkin doubled in aboveground biomass only. Contents per shoot of carbon (C), nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), and magnesium (Mg) were almost doubled during the ''NO2- enhanced'' growth in lettuce, but not in other plants. Mass spectrometry analysis of 15 N/ 14 N indicated that only a minor proportion (0.2%-14%) of total plant N was derived from NO2, implying that exogenous NO2 acts as a signal rather than