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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。
The contents of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and malondialdehyde (MDA) The content of osmotic adjustment substance (soluble protein, soluble sugar, proline) of Haloxylon ammodendron under two kinds of conditions were determined. The membership function method was used to evaluate each index comprehensively. The results showed that the activities of the three protective enzymes of Haloxylon ammodendron from the two treatments increased first and then decreased, and the activities of protective enzymes of Haloxylon ammodendron were both higher than those of the non-parasitized Haloxylon ammodendron. The content of MDA in Haloxylon ammodendron was significantly increased after being parasitized by Cistanche tubulosa, and the contents of soluble protein and proline, the major osmotic adjustment substances in plants, increased to some extent, but the content of soluble sugar decreased. The correlation analysis and comprehensive assessment of the indexes indicated that the invasion of Cistanche deserticola caused the stress environment to the host Haloxylon ammodendron and caused obvious injury to the host protective enzyme system and osmotic adjustment system and reduced the drought resistance of the host Haloxylon ammodendron.