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生态学杂志 ›› 2009, Vol. 28 ›› Issue (08): 1531-1536.

• 研究报告 • 上一篇    下一篇

肉苁蓉寄生对梭梭幼苗保护酶活性及渗透调节物质的影响

李霞1;马永清1,2;宋玉霞3;税军峰2;李秀维2   

  1. 1西北农林科技大学资源与环境学院;2西北农林科技大学水土保持研究所;3宁夏农业生物技术重点实验室
  • 出版日期:2009-08-10 发布日期:2009-08-10

Effects of Cistanche deserticola  parasitization on Haloxylon ammodendron  seedlings protective enzyme activities and osmotic adjustment substance contents.

LI Xia 1;MA Yongqing2;SONG Yuxia3;SHUI Junfeng2;LI Xiuwei2   

  1. 1College of Resources and Environment, Northwest A &F University;2Institute of Soil and Water Conservation, Northwest A &F University;3Ningxia Agricultural Biotechnological Key Laboratory
  • Online:2009-08-10 Published:2009-08-10

摘要: 以寄生和未寄生肉苁蓉的梭梭为对象,分别测定其同化枝的超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性及丙二醛(MDA)含量,同时测定了2种条件下梭梭的渗透调节物质(可溶性蛋白质、可溶性糖、脯氨酸)含量,并采用隶属函数法对各个指标进行综合评定。结果显示:2种处理的梭梭在6—9月3种保护酶活性的变化趋势均为先升后降,且寄生肉苁蓉梭梭的保护酶活性在前期均高于未寄生的梭梭。梭梭在被肉苁蓉寄生后,MDA含量显著增加,且植株体内的主要渗透调节物质——可溶性蛋白质及脯氨酸含量均有不同程度的升高,但可溶性糖含量却有所降低。各指标的相关分析和综合评定结果表明,肉苁蓉的寄生给寄主梭梭造成了胁迫的环境,对寄主保护酶系统及渗透调节系统产生了明显的伤害,并降低了寄主梭梭的抗旱性。

关键词: 小粒咖啡, N、P、K, 配比实验, 生长, 光合特性, 产量

Abstract: In order to understand the effects of  Cistanche deserticola  parasitization on  Haloxylon ammodendron growth, the activities of protective enzymes (SOD, POD and CAT) and the contents of osmotic adjustment substances (soluble protein, soluble sugar and free proline) in  H. ammodendron assimilating branches were measured, and the comprehensive drought-resistant capability of  H. ammodendron  under parasitized and un-parasitized conditions was evaluated by subordinate function values analysis. During the whole measurement period (from June to September), the test enzyme activities in  H. ammodendron  assimilating branches all decreased after an initial increase, and were lower in parasitized than in un-parasitized  H. ammodendron  in early period. After parasitized by  C. deserticola , the MDA content in  H. ammodendron increased significantly, soluble protein and free proline contents increased in different degrees, while soluble sugar content decreased. The parasitization of  C. deserticola  gave the host plant a stress environment, making an obvious damage on host’s protective enzyme system and osmotic adjustment system and the decrease of host’s drought resistance.

Key words: Coffea arabica, N, P, K, Fertilization strategy, Growth, Photosynthesis, Yield