摘要
对小麦秸秆不同部位水浸提液对玉米田恶性杂草——牛筋草的化感作用进行了初步研究。通过室内生物测定法研究了小麦秸秆的不同部位(根、茎、穗)不同浓度水浸液(6.25、12.5、25、50、100 mg/mL)对牛筋草种子萌发和幼苗生长的化感作用。小麦秸秆不同部位水浸液处理的牛筋草发芽率依次为对照(84.5%)>根(71.3%)>茎(68.7%)>穗(58.7%),发芽指数依次为对照(18.39)>根(12.82)>茎(6.77)>穗(6.07)。当根、茎、穗部水浸液浓度为6.25 mg/mL时,牛筋草根长分别比对照增加17.1%,17.8%及6.6%,而当其浓度为100 mg/mL时,牛筋草根长分别比对照降低25.6%、31.6%及95.6%。通过拟合剂量-效应曲线得到小麦秸秆根、茎及穗部水浸液对牛筋草根部生长的半数效应浓度EC50值分别为219.182、157.545、41.007 mg/mL。小麦秸秆根、茎、穗部水浸液对牛筋草种子的萌发均具有抑制作用,随着浓度的升高,牛筋草发芽率逐渐降低,发芽指数逐渐减少。其中,根部水浸液对牛筋草苗高无显著影响,茎、穗部水浸液只有在最高浓度处理下显著抑制其幼苗高度,但是对其根部生长均表现出"低促高抑"作用。
The objective is to study allelopathic effects of aqueous extracts from root, stem and spikes of wheat straw on the seed germination and seedling growth of goosegrass （Eleusine indica）. A petri dish bioassay method was used to test the allelopathic effects. Germination rate of root, stem and spikes aqueous extracts was 71.3%, 68.7% and 58.7% respectively, while the control was 84.5%, and germination index was 12.82, 6.77, 6.07 respectively, while the control was 18.39. Compared with control, the root length increased by 17.1%, 17.8% and 6.6% respectively when the concentration of root, stern and spikes aqueous extracts was 6.25 mg/mL, but decreased by 25.6%, 31.6% and 95.6% respectively when the concentration was 100 mg/mL. ECso was calculated through dose-response equation between different concentrations of root, stem and spikes aqueous extracts and root lengths, and the value was 219.182, 157.545, 41.007 mg/mL respectively. Aqueous extracts from root, stem and spikes of wheat straw all inhibited the germination of goosegrass, the germination rate and index decreased with the increasing concentration. Stem and spikes aqueous extracts inhibited the shoot length of goosegrass significantly only at the highest concentration, while root aqueous extracts had littleeffects. The root, stem and spikes aqueous extracts promoted the root growth of goosegrass at low concentrations but inhibited it at high concentrations.
出处
《中国农学通报》
CSCD
2013年第27期58-63,共6页
Chinese Agricultural Science Bulletin
基金
国家科技支撑计划"农林重要杂草鼠害监控技术研发"(2012BAD19B02)
关键词
小麦秸秆
水浸液
牛筋草
化感作用
wheat straw
aqueous extracts
goosegrass （Eleusine indica）
allelopathie effects
