卷叶黄精根不同极性化感物质的化感作用

化感作用是植物通过淋溶、挥发、残茬降解和根系分泌向环境中释放化学物质,从而对自身或周围其他植物的生长产生影响的现象(孔垂华等,2001;董卓杭等,2001;翟明普等,1993;林文雄等,2001;马茂华等,1999;彭少麟等,2001).化感作用普遍存在于自然界,对其深入研究将有利于复合系统中植物配置、耕作制度和栽培措施的科学化,在植物间加强促进作用,降低抑制作用,促进生物多样性和农业可持续发展.

Allelopathy Effects of Different Polarity Allelochemicals from Polygonatum cirrhifolium Root

With Polygonatum cirrhifolium root as the donator, the wheat, cucumber and carrot as receiver plant, the potential allelopathic effects of petroleum extracts, acetic ether extracts, n-butanol extracts and aqueous extracts from donator on the seed germination and seedling growth of three receiver plants were studied by culture plate and filter-paper. The results showed that every extracts had different allelopathic effection on different receiver plant or on different position of same receiver plant. The allelopathy intensity were related to the concentration and strengthen along with the concentration raise. The different receiver plant had distinct sensitive to the the allelopathic effect, cucumber was more sensitive than carrot and wheat. Every extracts had inhibition against seed germination and seedling growth, but inhibited root growth at high concentration and stimulated it at low concentration. In a word, every extracts had more impact on the seedling growth, however, had weak inhibition against seed germination. The average allelopathic effection of acetic ether extracts was more stronger, then n-butanol extracts, aqueous extracts and petroleum extracts. The acetic ether extracts had extremely strong inhibition on the growth of seedling and root, and n-butanol extracts on the seed germination also, which implied the Polygonatum cirrhifolium contained the allelochemicals with high polarity. In rhizosphere soil of P. cirrhifolium , the root and seedlings growth of wheat was stimulated, while cucumber and carrot was inhibited.