化感小麦根系分泌物对看麦娘生长及保护酶活性的影响  

Impacts of root exudates from allelopathy wheat (Triticum aestivum L.) on the growth and protective enzyme activity of Alopecurus aequalis (L.)

作　　者：邱秋金 洪涌 肖清铁[2,3] 林瑞余[2,3] QIU Qiujin;HONG Yong;XIAO Qingtie;LIN Ruiyu(School of General Education,Putian College,Xianyou,Fujian 351200,China;Fujian Provincial Key Laboratory of Agroecological Processing and Safety Monitoring/College of Life Sciences,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Key Laboratory of Crop Ecology and Molecular Physiology of Fujian Province University,Fujian Agriculture and Forestry University,Fuzhou,Fujian 35002,China)

机构地区：[1]莆田学院基础教育学院,福建仙游351200 [2]福建省农业生态过程与安全监控重点实验室/福建农林大学生命科学学院,福建福州350002 [3]福建农林大学作物生态与分子生理学福建省高校重点实验室,福建福州350002

出　　处：《福建农林大学学报（自然科学版）》2019年第5期545-549,共5页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：国家自然科学基金项目(30671220,31070403);福建省高校服务海西建设重点项目(0B08B005)

摘　　要：为阐明小麦化感抑草效应与机制 以强化感小麦‘92L89’和弱化感小麦‘抗10103’为材料 通过沙培不同密度的小 麦 分 析了根系分泌物对看麦娘根长、株高、根系活力、叶片保护酶活性及 MDA 含量的影响.结果表明 化感小麦根系分泌 物显著抑制看麦娘根长与株高生长 抑制效应随种植密度的增大而增强 强化感小麦的抑制率显著高于弱化感小麦.不同密 度强化感小麦处理下 看麦娘的根系活力比对照下降了30.4%~45.1% 显著高于弱化感小麦的25.9%~28.2% 看麦娘叶片 的SOD活性、POD活性、PAL活性及MDA含量分别比对照提高了27.8%~42.8%、18.4%~77.1%、34.2%~70.1%和30.0%~ 78.0% 而弱化感小麦处理后依次提高了5.4%~26.6%、9.6%~24.7%、7.9%~41.1%和4.0%~54.0% 低密度弱化感小麦处 理的看麦娘株高、SOD 活性、PAL 活性与对照无显著差异.可见 化感小麦通过根系分泌作用抑制了受体植物根系活力和生 长 刺激叶片 SOD、POD、PAL 活性提高 引起脂质过氧化作用及苯丙烷途径代谢增强 不利于靶标植物的生长.To illustrate the allelopathy effects of wheat (Triticum aestivum L.) on Alopecurus aequalis strong (92L89) and weak (Kang10103) allelopathic wheat were planted in sand under 4 densities for 40 d. Then the growing medium was used to cultivate A. aequalis for 7 d. Then root length plant height and root vigor MDA content in leaves and protective enzyme activity of A.aequalis were evaluated. The results showed that root length and plant height of A.aequalis were significantly inhibited by root exudates from allelopathic wheat. The inhibitory effects increased with higher planting density and they were visibly higher in strong allelopathic wheat than weak allelopathic wheat. Root vigor of A.aequalis declined by 30.4%-45.1% from treatments with root exudates from wheat 92L89 which were significantly higher than those from wheat Kang10103 (decline by 25.9%-28.2%). SOD POD PAL and MDA contents in leaves of A.aequalis increased by 27.8%-42.8% 18.4%-77.1% 34.2%-70.1% and 30.0%-78.0% re spectively in treatments with wheat 92L89 while these indexes increased by 5.4%-26.6% 9.6%-24.7% 7.9%-41.1% and 4.0% -54.0% respectively in treatments with wheat Kang10103. However no significant difference in plant height and activities of SOD and PAL was detected in treatments with wheat Kang10103 planted in low density and the control. In conclusion root exudates from allelopathic wheat can impede the development of targeting weed which includes inhibited root vigor and growth promoted ac tivities of SOD POD and PAL lipid peroxidation and enhanced phenylpropane metabolism.

关 键 词：小麦 化感作用 看麦娘 根系活力 保护酶活性 

分 类 号：S512.1[农业科学—作物学]