CO_(2)浓度升高和干旱对虎耳草生长及有效成分的影响

Effects of Elevated CO_(2) Concentration and Drought Stress on Growth and Active Ingredients of Saxifraga stolonifera Curt.

以虎耳草为试材,采用盆栽控制试验的方法,设置400、800μmol·mol-12个CO_(2)浓度,每个CO_(2)浓度处理下设置2个水分梯度(正常水分(90%田间含水量)和干旱处理(40%田间含水量)),研究了CO_(2)浓度升高和干旱对虎耳草生长及药用成分的影响,以期为全球气候变化背景下虎耳草的种植与培育提供参考依据。结果表明:干旱处理后虎耳草株高、叶片数以及根、茎、叶和总生物量显著降低,次生代谢产物岩白菜素和没食子酸生物产量显著下降,而丙二醛(MDA)、可溶性糖、岩白菜素、没食子酸含量和超氧化物歧化酶(SOD)活性显著增加;升高CO_(2)浓度显著增加虎耳草的株高、叶片数、生物量、岩白菜素和没食子酸含量及生物产量,显著降低MDA含量;在干旱处理下升高CO_(2)浓度显著增加虎耳草的株高、叶片数、生物量、SOD含量、可溶性糖及岩白菜素和没食子酸含量,显著降低MDA含量。综上,干旱对虎耳草生长有显著抑制作用,升高CO_(2)浓度能促进虎耳草生长并缓解干旱导致的负面影响,增加岩白菜素和没食子酸含量及生物产量。

Saxifraga stolonifera Curt.was used as experimental material,potted plant control experiments methed was used,two CO_(2)concentrations of 400μmol·mol-1and 800μmol·mol-1were set,and two water gradients were set for each CO_(2)concentration treatment,included normal water content(90%field water content)and drought treatment(40%field water content).The effects of elevated CO_(2)concentration and drought on the growth and medicinal ingredients of Saxifraga stolonifera Curt were studied,in order to provide reference for the cultivation and cultivation of Saxifraga stolonifera Curt.under the background of global climate change.The results showed that the plant height,leaf number,roots,stems,leaves and total biomass of S.stolonifera decreased significantly after drought treatment.The biological yields of secondary metabolites bergenin and gallic acid decreased significantly,while MDA,SOD,and soluble sugar,bergenin and gallic acid content increased significantly.Elevated CO_(2)concentration significantly increases the plant height,leaf number,biomass,bergenin and gallic acid content and biological yield of S.stolonifera,and significantly reduces MDA content.Under drought treatment,increased CO_(2)concentration significantly increased plant height,leaf number,biomass,soluble sugar,bergenin,gallic acid contents and SOD activity of S.stolonifera,and significantly reduced the MDA content.In conclusion,drought had a significant inhibitory effect on the growth of S.stolonifera.Increasing CO_(2)concentration could promote the growth of S.stolonifera,alleviate the negative effects caused by drought,and increase the content of bergenin and gallic acid and biological yield.