稀土铈(CeCl_3)对黄瓜抗枯萎病的影响

Effect of Rare Earth Element Cerium (Cerium chloride) on Cucumber Resistance to Fusarium Wilt

以黄瓜枯萎病为研究对象,通过盆栽试验探讨了不同浓度稀土铈(CeCl3)对接种黄瓜枯萎病菌后黄瓜植株发病情况、生长状况、相关防御酶活性的影响。结果表明:与不添加CeCl3的对照相比,施用CeCl3降低了黄瓜枯萎病发病率和病情指数,促进了植株生长发育,提高了防御酶活性;随着CeCl3浓度的增大,促进效果先增强后减弱,其中以200mg·L-1处理效果最好,黄瓜各生长指标显著提高,叶绿素含量、根系活力、脯氨酸含量分别比对照提高85.91%、60.75%、55.77%,过氧化物酶(POD)、多酚氧化酶(PPO)、苯丙氨酸解氨酶(PAL)活性分别比对照提高49.29%、31.50%、80.00%,丙二醛含量比对照降低61.67%。

Cucumber fusarium wilt was used as research target.The impacts of adding different concentrations of rare earth element cerium(Cerium chloride)on cucumbers fusarium wilt incidence,the plants growth conditions and the activities of the enzymes related to defense were discussed by pot cultivation experiment.The results showed that cucumber fusarium wilt incidence and disease index were reduced,the plant growth and development was promoted,and the activities of defense enzymes was increased by applying cerium.As cerium concentration increased,the promoting effect increased at first and then decreased as compared with the control.The best effect was 200 mg·L-1 treatment,each cucumber growth index was significantly higher than that of the control.The chlorophyll content,root system activity and proline content(Pro)were increased 85.91%,60.75%,55.77%,respectively.The activities of peroxidase(POD),polyphenoloxidas(PPO)and phenylalanine ammonia-lyase(PAL) were increased by 49.29%,31.50%,80.00%,respectively then the control.Malondialdehyde(MDA) content declined 61.67% than the control.