空心莲子草化感效应的初步研究

测定空心莲子草(Alternanthera philoxeroides Griseb)地上部和地下部水浸提液对小麦和油菜种子萌发、幼苗生长和一些生理过程的影响,研究空心莲子草的化感作用及其机理。结果显示,空心莲子草水浸提液对小麦种子萌发过程的影响主要表现在延迟发芽,而对最终萌发率影响不大;在油菜种子的萌发过程中,高浓度的水浸提液延迟了种子发芽,同时影响最终萌发率;在低浓度空心莲子草水浸提液的影响下,小麦幼苗植株生长增加,高浓度地下部分水浸提液则抑制了小麦幼苗根和苗的生长;在油菜幼苗的生长过程中,空心莲子草水浸提液均抑制了油菜幼苗的生长;另外,空心莲子草水浸提液处理过程中,小麦和油菜体内的超氧化物歧酶(SOD)活性和过氧化物酶(POD)活性均有显著变化。

Allelopathic effects of Alternanthera philoxeroides Griseb

Through measuring the effects on the seed germination,seedling growth and physiological process in Triticum aestivum L. and Brassica. napus L. with the aqueous extract of the overground part and subterranean part of A. philoxeroides Griseb,we studied allelopathy of A. philoxeroides Griseb and its mechanism. As a result, the effects on the seed germination in T. aestivum L with the aqueous extract of A.philoxeroides Griseb mostly shew that delayed the seed germination ,but the ultima rate of the seed germination did't be obviously affected.In the seed germination in B. napus L process,the high constration aqueous extract of A.philoxeroides Griseb delayed the seed germination and affected the final rate germination.The high constration aqueous extract of A.philoxeroides Griseb all accelerated seedling growth in T. aestivum L.,but the low constration apueous extract of subterranean part controlled its growth..In the seedling of B. napus L.growth process, the aqueous extract of A. philoxeroides Griseb controlled seedling growth.Moreover,the active of sod and pod in T. aestivum L. and B. napus L.all is evidently changed because of the effects of the aqueous extract of A. philoxeroides Griseb.