Zhou Shixing, Zokir Toshmatov, Mei Yu, Lei Lijing, Shi Kai, Zou Ting, Zhang Chi, Shao Hua
State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi 276000, China.
Plants (Basel). 2021 Mar 5;10(3):495. doi: 10.3390/plants10030495.
The chemical profile and allelopathic effect of the volatile organic compounds (VOCs) produced by a dominant shrub (Krasch.) Poljak. growing in northwestern China was investigated for the first time. was found to release volatile compounds into the surroundings to affect other plants' growth, with its VOCs suppressing root elongation of L. and L. by 65.47% and 60.37% at 10 g/1.5 L treatment, respectively. Meanwhile, volatile oils produced by stems, leaves, flowers and flowering shoots exhibited phytotoxic activity against and . At 0.5 mg/mL, stem, leaf and flower oils significantly reduced seedling growth of the receiver plants, and 1.5 mg/mL oils nearly completely prohibited seed germination of both species. GC/MS analysis revealed that among the total 37 identified compounds in the oils, 19 of them were common, with eucalyptol (43.00%, 36.66%, 19.52%, and 38.68% in stem, leaf, flower and flowering shoot oils, respectively) and camphor (21.55%, 24.91%, 21.64%, and 23.35%, respectively) consistently being the dominant constituents in all oils. Eucalyptol, camphor and their mixture exhibited much weaker phytotoxicity compared with the volatile oils, implying that less abundant compounds in the volatile oil might contribute significantly to the oils' activity. Our results suggested that was capable of synthesizing and releasing allelopathic volatile compounds into the surroundings to affect neighboring plants' growth, which might improve its competitiveness thus facilitate the establishment of dominance.
首次对中国西北一种优势灌木（Krasch.）Poljak.产生的挥发性有机化合物（VOCs）的化学特征和化感效应进行了研究。发现该灌木会向周围环境释放挥发性化合物以影响其他植物的生长，在10 g/1.5 L处理下，其VOCs分别使L.和L.的根伸长抑制了65.47%和60.37%。同时，该灌木茎、叶、花和花枝产生的挥发油对和表现出植物毒性活性。在0.5 mg/mL时，茎、叶和花的挥发油显著降低了受体植物的幼苗生长，1.5 mg/mL的挥发油几乎完全抑制了这两个物种的种子萌发。气相色谱/质谱分析表明，在挥发油中总共鉴定出的37种化合物中，有19种是常见的，其中桉叶油素（在茎、叶、花和花枝挥发油中分别为43.00%、36.66%、19.52%和38.68%）和樟脑（分别为21.55%、24.91%、21.64%和23.35%）始终是所有挥发油中的主要成分。与挥发油相比，桉叶油素、樟脑及其混合物表现出弱得多的植物毒性，这意味着挥发油中含量较少的化合物可能对其活性有显著贡献。我们的结果表明，该灌木能够合成并向周围环境释放化感挥发性化合物以影响邻近植物的生长，这可能会提高其竞争力，从而有助于建立优势地位。
