Acta Agrestia Sinica

Acta Agrestia Sinica ›› 2022, Vol. 30 ›› Issue (6): 1500-1508.DOI: 10.11733/j.issn.1007-0435.2022.06.022

Previous Articles    

Effects of Root Exudates of Three Stylosanthes guianensis Sw. on the Growth of Weed Seedlings

WANG Li-yuan1, WANG Jian2, DING Xi-peng3, OU Fang-xiu1, LI Jia-xu1, LI Xue-feng1   

  1. 1. Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education/College of Forestry, Hainan University, Haikou, Hainan Province 570228, China;
    2. College of Animal Science and Technology, Hainan University, Haikou, Hainan Province 570228, China;
    3. Institute of Tropical Crops Genetic Resources, Haikou, Hainan Province 571737, China
  • Received:2021-11-05 Revised:2021-12-22 Published:2022-07-05

3种圭亚那柱花草根系分泌物对杂草幼苗生长的影响

王俐媛1, 王坚2, 丁西朋3, 欧芳秀1, 李佳旭1, 李雪枫1   

  1. 1. 热带特色林木花卉遗传与种质创新教育部重点实验室/海南大学林学院, 海南 海口 570228;
    2. 海南大学动物科技学院, 海南 海口 570228;
    3. 中国热带农业科学院热带作物品种资源研究所, 海南 海口 570228
  • 通讯作者: 李雪枫,E-mail:xfli0922@163.com
  • 作者简介:王俐媛(1998-),女,汉族,四川泸县人,硕士研究生,主要从事热带植物资源及利用研究,E-mail:2319111872@qq.com
  • 基金资助:
    海南省自然科学基金项目（319MS016）；海南省自然科学基金（317054）；国家自然科学基金（31860682）资助

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Abstract: The root exudates of three Stylosanthes guianensis Sw. (‘Reyan No. 2’,‘Reyan No. 5’ and ‘Reyan No. 21’) were collected using nutrient solution culture to study their effects on seedling morphological characteristics and biomass distribution of five alien invasive weeds in order to determine the allelopathic effects of root exudates of three S. guianensis Sw. on weeds growth. The results showed that the total allelopathic synthetical effects of three species of S. guianensis Sw. on the other four weeds were inhibitory,except that they had no significant effect on Mimosa pudica L. seedlings. The allelopathic inhibition of weed seedlings from strong to weak was S. guianensis Sw. ‘Reyan No. 5’,‘Reyan No. 2’ and ‘Reyan No. 21’. The root exudates from S. guianensis Sw. ‘Reyan No. 5’ significantly inhibited root length,plant height,underground biomass,aboveground biomass,total biomass,and root-shoot ratio of Cenchrus echinatus L. (P<0.05),as well as the lateral root number,underground biomass,and root-shoot ratio of Tridax procumbens L. (P<0.05). It also exhibited a significant inhibitory effect on underground biomass and root-shoot ratio of Eupatorium catarium V. seedlings (P<0.05),but only a little inhibitory effect on Bidens pilosa L. seedlings. The relationship between the allelopathic synthetical effect and different allelopathic response indexes was analyzed by the Grey correlation method. The results showed that more attention should be paid to total biomass,aboveground biomass and plant height in the allelopathic effect study of S. guianensis Sw. According to the comprehensive experimental data and allelopathy analysis,S. guianensis Sw. ‘Reyan No. 5’ might be more suitable for weed control in the field among the three species of S. guianensis Sw.

Key words: Root exudates, Invasive weeds, Morphological characteristics, Biomass allocation, Allelopathic inhibitory effect

摘要： 为明确3种圭亚那柱花草（Stylosanthes guianensis Sw.）（‘热研2号’、‘热研5号’和热研21号）的根系分泌物对杂草生长的化感效应，采用营养液培法分别收集其根系分泌物，研究其对5种外来入侵杂草幼苗形态特征及生物量分配的影响。结果表明，除对含羞草（Mimosa pudica L.）幼苗无显著影响外，3种圭亚那柱花草对其余4种杂草的总化感综合效应均为抑制作用。‘热研5号’柱花草对杂草幼苗生长的化感抑制效应强于其他二者，对蒺藜草（Cenchrus echinatus L.）幼苗的根长、株高、地下生物量、地上生物量、总生物量和根冠比均有显著抑制效应（P<0.05），对羽芒菊（Tridax procumbens L.）幼苗的侧根数、地下生物量和根冠比有显著抑制效应（P<0.05），也显著抑制假臭草（Eupatorium catarium V.）幼苗的生物量向地下分配（P<0.05），仅对鬼针草（Bidens pilosa L.）幼苗的抑制效应相对较弱。灰色关联分析表明，进行圭亚那柱花草的化感效应研究中应重点关注总生物量、地上生物量和株高。由此推测，3种圭亚那柱花草品种中，‘热研5号’柱花草具有防控外来入侵杂草的潜力。

关键词: 根系分泌物, 外来入侵杂草, 形态特征, 生物量分配, 化感抑制效应

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