水分亏缺对……根系生物量生产及次生代谢产物积累的影响
Effect of water deficit on biomass production and accumulation of secondary metabolites in roots of .
作者信息
Li W D, Hou J L, Wang W Q, Tang X M, Liu C L, Xing D
机构信息
1School of Chinese Pharmacy, Beijing University of Chinese Medicine, Beijing, 100102 China.
Engineering Research Center of Good Agricultural Practice for Chinese Crude Drugs, Beijing, China.
出版信息
Russ J Plant Physiol. 2011;58(3):538-542. doi: 10.1134/S1021443711030101. Epub 2011 May 5.
Abstract
Two-year-old seedlings of licorice plant ( Fisch) were exposed to three degrees of water deficit, namely weak (60-70%), moderate (40-50%), and strong (20-30%) relative water content in soil, whereas control plants were grown in soil with 80-90% water content. Moderate and strong water deficit decreased the net photosynthetic rate, stomatal conductance, and biomass production. Water use efficiency and the root-to-shoot ratio increased significantly in response to water deficit, indicating a high tolerance to drought. Weak water deficit did not decrease root biomass production, but significantly increased the production of glycyrrhizic acid (by 89%) and liquiritin (by 125%) in the roots. Therefore, a weak water deficit can increase the yield of root medical compounds without negative effect on root growth.
摘要
将两年生甘草（Fisch）幼苗置于三种水分亏缺程度下，即土壤相对含水量为轻度（60 - 70%）、中度（40 - 50%）和重度（20 - 30%），而对照植株种植在含水量为80 - 90%的土壤中。中度和重度水分亏缺降低了净光合速率、气孔导度和生物量生产。水分利用效率和根冠比因水分亏缺而显著增加，表明对干旱具有较高的耐受性。轻度水分亏缺并未降低根系生物量生产，但显著增加了根中甘草酸（增加89%）和甘草苷（增加125%）的产量。因此，轻度水分亏缺可提高根中药用化合物的产量，而对根系生长无负面影响。
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