巨尾桉叶片挥发物对三种植物种子萌发及幼苗生长的化感效应

为探讨人工巨尾桉林叶片挥发物对周边农作物的化感作用,采用不同质量新鲜巨尾桉叶片及由新鲜叶片提取的桉叶油对玉米、辣椒、西红柿等三种植物种子进行处理,观测其种子萌发和幼苗生长状况。结果表明:(1)在三种被测植物中,桉树叶片挥发物对玉米种子萌发影响最小,对辣椒影响最大;(2)当叶片用量小于200g时,桉树叶片挥发物对三种植物种子萌发影响不明显,当叶片用量达400g时,能完全抑制辣椒、西红柿种子萌发,并能极显著降低玉米种子萌发(P0.01);(3)玉米幼苗芽生长随叶片用量的增加呈现先促进后抑制现象,对芽高、鲜重、干重的促进和抑制均达到显著(P0.05)或极显著水平(P0.01);(4)当叶片用量小于或等于100g时,桉树叶片挥发物对辣椒、西红柿幼苗生长影响不明显,当用量达到200g时则能极显著抑制辣椒、西红柿幼苗生长;(5)桉叶油对三种测试植物的抑制效果与叶片自然挥发物相似,且效果更显著。

Allelopathic effects of Eucalyptus grandis×E. urophlla leaf volatile on seed germination and seedling growth

The allelopathic effects of Eucalyptus grandis&#215;E. urophlla plantation leaf volatile on surrounding crop were investigated,and seedling growth of three plants such as Zea mays,pepper,tomatoes were studied by using different quality fresh eucalyptus leaves and the eucalyptus essential oil from fresh leaves,the seed germination. The results showed that:(1)In three kinds of tested plants,E. grandis&#215;E. urophlla leaf volatiles had little effect on zea mays seed germination,great effect on pepper;(2)When the amount was less than 200 g,E. grandis&#215;E. urophlla leaf volatiles had no obvious effect on seed germination of three tested plants; When the dosage was 400 g,it could completely inhibit seed germination of peppers,tomatoes,and could reduce seed germination significantly(P<0.01);(3)With an increase of the dosage of leaf,the Zea mays growth first promoted and then suppressed,and it was significant(P< 0.05)or extremely significant level(P<0.01)to bud height,fresh weight,dry weight;(4)when the amount was less than or equoal to 100 g,the E. grandis&#215;E. urophlla leaf volatiles was not obvious effect on seedling growth of peppers and tomatoes; when the amount reached 200 g,it could significantly inhibit the seedling growth peppers and tomatoes;(5)The eucalyptus essential oil had similar inhibitory effect on the 3 plants species with leaf natural volatile,and the effect was more significant.The allelopathic effects of Eucalyptus grandis&#215;E. urophlla plantation leaf volatile on surrounding crop were investigated,and seedling growth of three plants such as Zea mays,pepper,tomatoes were studied by using different quality fresh eucalyptus leaves and the eucalyptus essential oil from fresh leaves,the seed germination. The results showed that:(1)In three kinds of tested plants,E. grandis&#215;E. urophlla leaf volatiles had little effect on zea mays seed germination,great effect on pepper;(2)When the amount was less than 200 g,E. grandis&#215;E. urophlla leaf volatiles had no obvious effect on seed germination of three tested plants; When the dosage was 400 g,it could completely inhibit seed germination of peppers,tomatoes,and could reduce seed germination significantly(P<0.01);(3)With an increase of the dosage of leaf,the Zea mays growth first promoted and then suppressed,and it was significant(P< 0.05)or extremely significant level(P<0.01)to bud height,fresh weight,dry weight;(4)when the amount was less than or equoal to 100 g,the E. grandis&#215;E. urophlla leaf volatiles was not obvious effect on seedling growth of peppers and tomatoes; when the amount reached 200 g,it could significantly inhibit the seedling growth peppers and tomatoes;(5)The eucalyptus essential oil had similar inhibitory effect on the 3 plants species with leaf natural volatile,and the effect was more significant.