应用可拓学原理评价黄瓜根分泌物的化感潜势

The Evaluation of Allelopathic Potential of Cultured Cucumber Root Exudates Based on Extension Engineering Principles

对黄瓜组培根分泌物的化感潜势进行可拓评价,得出黄瓜组培根分泌物对菜豆幼苗生长有显著促进作用,而对其它3种作物有明显的毒害作用,毒害程度为黄瓜>甜瓜>番茄。同时,建立了黄瓜组培根分泌液的化感效应的数学模型RE=[k1Rp0/(k2-k1)](e-k1t-e-k2t)(e-k1a-e-k2a),说明了黄瓜组培根分泌液的化感效应与组培根培养时间(t)以及根分泌液浓度(a)显著相关。黄瓜根分泌物对4种受体作物显示出显著的化学干扰差异,论证了植物种内(间)发生的干扰作用与植物的品种(系)有关,从理论上得出菜豆可以作为黄瓜的间套作物或下茬作物。

The use of extension engineering theory to evaluate allelopathic potential of exudates from cultured cucumber （ Cucumis sativus L. ） roots provides a novel approach for the quantitative assessment of allel- opathy between crops and scientific guidance for modem agriculture industry. A combination of cultured root techniques and extension engineering methods was used to theoretically assess the allelopathic potential of cultured cucumber root exudates on four test crops： bean （Phaseolus vulgaris L. ）, cucumber, melon （Cucumis melo L）, and tomato （Lycopersicon esculentum L. ）. Extension measurement of allelopathic potential of cultured cucumber root exudates indicated that cucumber significantly stimulated the growth of bean seedlings. In contrast, cultured cucumber root exudates significantly inhibited cucumber, melon, and tomato seedlings. A mathematical model, RE = [k1Rp0/（k2 -k1 ）] （e^-k1a-e^-k2ta （e^-k1a-e^-k2a） , was developed to show the dependence of allelopathic potential （RE ） of cultured cucumber root exudates on culture time （t） and root exudate concentration （a） where Rp0 = RE when t = 0. Significant differences in the chemical interference of cucumber root exudates on seedling growth of the four acceptor crops demonstrates inter- or intra-specific relationships related to the plant accession causing allelochemical reactions. Extension evaluation of allelopathic potential of the exudates from cultured cucumber roots theoretically shows that beans are an appropriate choice for intercropping with cucumbers or as a successive crop after cucumber harvest.