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期 刊 ：植物保护学报 2009年

关键词：鸭跖草；表皮特征；解剖结构；耐药性；杂草；

Keywords:dayflower, foliar surface features, leaf dissection structure, tolerance, weed,

摘 要 ：鸭跖草是黑龙江省大豆田危害严重的恶性杂草,而且其叶龄愈大愈难防除。作者通过盆栽试验及细胞显微技术研究不同叶龄鸭跖草对咪唑乙烟酸的耐药性差异及其与叶片显微结构的关系。结果显示,鸭跖草随着叶龄增大,对咪唑乙烟酸的耐药性增强,并在3叶龄时出现拐点;随着叶龄的增大,叶片表皮气孔密度显著下降;叶片厚度、叶片上下表皮厚度、栅栏组织及海绵组织厚度显著增大;10个栅栏组织细胞长度显著减小,栅栏组织排列由稀疏不规则向紧密规则的方向发展。以上变化是鸭跖草对咪唑乙烟酸耐药性增强的原因之一。

Abstract:Dayflower (Commelina communis L.)is one of worst weeds in soybean field in Heilongjiang Province and more difficult to control at leaf stage. Using pot experiment and paraffin section technique, we investigated the relationship between the foliar surface features and dissection structure and the tolerance to imazethapyr in different leaf stages of dayflower. The studies showed that the tolerance to imazethapyr increased with leaf stage of dayflower and there was an inflexion in 3rd leaf stage. The stomata density of epidermis decreased with leaf stage, but the thickness of foliar, palisade tissue, spongy tissue, upper epidermis, lower epidermis, and the length of 10 palisade tissue cell, compactness degree of palisade tissue increased with leaf stage. These changes of foliar surface features and leaf dissection structure are one of reasons of dayflower more tolerant to imazethapyr with leaf stage.

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