水分胁迫对4种绢蒿属植物生理特性的影响

Effects of Water Stress on Physiological Characteristics of Four Seriphidium(Bess.) Poljak. Species

在土培条件下,研究水分胁迫对沙漠绢蒿(Seriphidium santolinum)、伊犁绢蒿(S.transiliense)、针裂叶绢蒿(S.sublessingianum)和民勤绢蒿(S.minchnense)4种绢蒿属植物生理特性的影响,并对4种绢蒿属植物进行抗旱性综合评价。结果表明,在水分胁迫下,伊犁绢蒿和针裂叶绢蒿叶片相对含水量显著降低;丙二醛、脯氨酸和可溶性糖含量均随胁迫程度的加强呈上升趋势,丙二醛和脯氨酸含量增加幅度较大的为针裂叶绢蒿和伊犁绢蒿,增加幅度较小的为沙漠绢蒿和民勤绢蒿;沙漠绢蒿和伊犁绢蒿根系活力呈先升高后降低的趋势;沙漠绢蒿和民勤绢蒿根冠比显著升高。模糊数学隶属函数法综合评价结果表明,4种绢蒿属植物抗旱性由强到弱为:民勤绢蒿>沙漠绢蒿>伊犁绢蒿>针裂叶绢蒿。

Four species of Seriphidium（Bess.）Poljak.（Seriphidium santolinum,S.transiliense,S.sublessingianum and S.minchünense）were planted in pot under the condition of water stress,and the drought resistance of different Seriphidium（Bess.）Poljak.species were comprehensively evaluated.The relative leaf water content of S.transiliense and S.sublessingianum were significantly reduced.Of all the four species,the MDA,proline and soluble sugar content increased with the increasing of drought stress.For both S.sublessingianum and S.transiliense,MDA and proline content increased more than others.Root vigor of S.santolinum and S.transiliense were present a ＂high-low＂tendency.Root/canopy ratio of S.santolinum and S.sublessingianum increased significantly.The water resistances comprehensively evaluated by subordinative function method,and the drought-resistant capability of the four species was ordered by S.minchünenseS.santolinumS.transilienseS.sublessingianum.