干旱-复水处理对迷迭香挥发性有机化合物释放规律的影响

Effect of drought stress and re-watering on emissions of volatile organic compounds from Rosmarinus officinalis

为了探讨干旱胁迫对迷迭香Rosmarinus officinalis挥发性有机化合物(volatile organic compounds,简称VOCs)释放规律的影响,采用称量控水法对迷迭香进行干旱胁迫试验,设置轻度、中度、重度干旱水平、复水和对照。结果表明:干旱胁迫下迷迭香VOCs释放总量减少,但种类增加;轻度、中度、重度处理VOCs总量分别是对照的99.6%,69.4%,43.2%。迷迭香VOCs主要是萜烯类化合物,占总量的46.0%以上;各干旱处理萜烯类化合物相对含量与对照比分别增加了14.4%,17.01%,23.7%,其中单萜类相对含量呈增加显著;干旱胁迫明显诱导C6绿叶性挥发物和醛类化合物的释放。复水处理萜烯类百分含量和单萜类百分含量比重度处理稍有下降,仍显著高于对照、轻度和中度处理。

To better understand the effects of water limitations on the emission of volatile organic compounds （VOCs）, VOC emissions from Rosmarinus officinalis were determined under drought stress and after re- watering. Results showed that with drought stress R. officinalis VOC emissions and lipoxidase activity were strongly affected with the degree of influence dependent on the stress level and time. At the beginning of the drought stress period, lipoxidase activity increased slightly; midway through, the activity reached a peak; then it declined. Drought stress reduced R. officinalis VOC emissions, but induced new VOCs including 2-hexenal, leaf alcohol, sorbaldehyde, and n-decanal. Also, R. officinalis increased terpene emissions, especially monoterpenes, to reduce drought stress damage.