LIU Min,LI Yue,JI Wenxian,et al.Physiological Response of Seedlings of Five Yellow Compositae Species to Drought Stress and Their Drought Resistance[J].Northern Horticulture,2016,40(11):61-67.[doi:10.11937/bfyy.201611017]
五种黄色系菊科植物幼苗对干旱胁迫的生理响应及抗旱性评价
- Title:
- Physiological Response of Seedlings of Five Yellow Compositae Species to Drought Stress and Their Drought Resistance
- Keywords:
- drought resistance; membership function; drought stress; physiological response; water-saving landscape; Compositae
- 文献标志码:
- A
- 摘要:
- 为筛选适合节水型园林建设中运用的抗旱性较强的植物，以5种黄色系菊科植物(万寿菊、孔雀草、雏菊、金鸡菊和天人菊)为试验材料，用3个浓度（10%、20%、30%）PEG 6000模拟干旱胁迫处理，研究了被测试植物幼苗对干旱胁迫的生理响应，并进行了抗旱性评价。结果表明：3种PEG浓度胁迫下均表现为随着胁迫时间的延长5种幼苗叶片的叶绿素含量持续下降，可溶性蛋白质含量先升后降，质膜相对透性和脯氨酸含量持续增加，且高浓度PEG引起的各项指标变幅大于低浓度下的变化幅度；但5种幼苗叶片内丙二醛积累情况有所差异，3种PEG浓度下都是孔雀草、天人菊和万寿菊随胁迫时间的延长，幼苗叶片中的丙二醛含量先降后升，而雏菊和金鸡菊则一直逐渐增加。利用隶属函数法对5种植物幼苗抗旱能力进行综合评价，轻度和中度干旱胁迫下，天人菊抗旱性最强，孔雀草次之，雏菊最弱；重度水分胁迫下，孔雀草抗旱性最强，天人菊次之，雏菊最弱。
- Abstract:
- In order to select strong drought resistance plants which were suitable for construction of water-saving landscape，five yellow compositae species(Tagetes erecta，Tagetes patula，Bellis perennis,Coreopsis drummondii，Gaillardia pulchella) were chosen as test material to study their leaves physiological responses to different degrees of drought stress and evaluate their drought resistance.The seedlings were treated with 10%，20% and 30% PEG 6000 to simulate mild，moderate and severe drought stress，respectively.Chlorophyll content，soluble protein content，proline content，plasma membrane relative permeability and MDA content of leaves were measured.The results showed that seedlings of these five plant species under three kinds of PEG concentration stress showed the same change as following：with increasing time of drought stress，the chlorophyll content continuously decreased；the soluble protein content rose initially and then fell；plasma membrane relative permeability and proline content continuously increased；the amplitude of the indicators caused by the higher concentration of PEG was larger than that by the lower concentration PEG.But the changing rules of the MDA content of five species seedlings were different.The content of MDA of T.erecta，T.patula and G.pulchella decreased followed by an increase，whereas the other two species seedling types continuously increased.Membership function analysis method was used to evaluate the drought resistance of the five seedlings.Under mild and moderate drought stress，the drought resistance of G.pulchella was the strongest，T.patula was the second，and B.perennis was the weakest.While under severe drought stress，the drought resistance of T.patula was the strongest，Gaillardia pulchella was the second，and Bellis perennis was the weakest.
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备注/Memo
第一作者简介：刘敏（1979-），女，博士研究生，副教授，现主要从事园林生态等研究工作。E-mail：liuminaa168@126.com.基金项目：国家自然科学基金资助项目（31501785）；齐齐哈尔大学青年教师科研启动支持计划资助项目（2012k-M23）。