摘要
研究了田间旱育条件下,在土壤水分充足和适度干旱状态时,化感水稻"PI312777"和非化感水稻"Lemont"的抑草效应差异。结果表明,在两种供水状态下,化感水稻"PI312777"对田间杂草的控制效应显著高于非化感水稻"Lemont","PI312777"对各种杂草抑制效应指数的绝对值多在0.5以上,而"Lemont"对各种杂草抑制效应指数的绝对值则多在0.5以下。进一步分析发现,适度干旱胁迫下"PI312777"和"Lemont"对杂草的抑制效应都有增强趋势,且"PI312777"稻田杂草生物量的降低幅度高于"Lemont"稻田;以与非化感水稻"Lemont"共生下的杂草生物量为对照,化感水稻"PI312777"对稻田杂草均表现出一定的化感抑制作用,且适度干旱胁迫诱导下化感作用强度进一步增加。此外,水稻对不同杂草的生物干扰强度不同,化感水稻"PI312777"对夏熟稻田阔叶杂草有较强的控制效果,干旱胁迫诱导"PI312777"对无芒稗(Echinochloacrusgalli L.)的化感潜力明显增强。
Under dry-raising condition in the paddy fields,an experiment was conducted to determine the differences in weed suppression ability between allelopathic rice ＂PI312777＂ and its counterpart ＂Lemont＂.The results show much higher inhibitory effect of ＂PI312777＂ than ＂Lemont＂ seedlings on weeds under the 2 soil water conditions.The absolute value of weed suppression index for ＂PI312777＂ is more than 0.5,and the reverse is the case for ＂Lemont＂.Further analysis suggests that dry stress increases weed suppression ability of the two rice varieties,and the degree ofincrease for allelopathic rice ＂PI312777＂ is higher than its counterpart ＂Lemont＂.With regard to weed biomass,weed suppression effect of ＂PI312777＂ can be described as allelopathic inhibitory,which is enhanced by moderate dry stress.Rice has different obstruction ability for different weed species.Allelopathic rice ＂PI312777＂ has greater control ability for broadleaf weeds in summer rice fields,and for barnyard grass （Echinochloa crusgalli） under water deficiency stress.
出处
《中国生态农业学报》
CAS
CSCD
北大核心
2009年第5期842-846,共5页
Chinese Journal of Eco-Agriculture
基金
国家自然科学基金项目(30471028
30671220)
福建省自然科学基金重大项目(2002F012)
福建省科技厅重点项目(K04038)资助
关键词
田间旱育
水稻
化感作用
抑草
Dry-raising
Rice
Allelopathy
Weed suppression
作者简介
孙小霞（1977～），女，博士研究生，讲师，主要从事植物学和生态学教学和研究。E-mail：joesxiaox@163．com
通讯作者：林文雄（1957～），男，博士，教授，博士生导师，主要从事植物生理与分子生态学研究。E-mail：wenxiong181@163．com
