己二酸二异丁酯对辣椒种子萌发及枯萎菌的化感效应

Allelopathic effects of diisobutyl adipate on pepper seed germination and Fusarium oxysporum f. sp. vasinfectum.

采用模拟的方式,利用生物测定和室内培养的方法,研究了不同浓度的己二酸二异丁酯对辣椒种子萌发、幼苗生长及辣椒枯萎菌的化感效应。结果表明:己二酸二异丁酯对辣椒种子萌发和幼苗生长具有低浓度促进、高浓度抑制的化感效应;己二酸二异丁酯对辣椒和茄子种子的化感效应存在较大差异,在低浓度时对辣椒种子萌发和幼苗生长的促进作用强于茄子种子,而高浓度时对辣椒种子萌发和幼苗生长的抑制强度弱于茄子种子;各浓度己二酸二异丁酯对辣椒枯萎菌菌丝生长有极显著的抑制作用,且作用强度随着浓度增加而增强,当浓度为1mnol.L-1时抑制作用最强,抑制率为10.75%;在田间抗病性调查期间内各浓度处理均提高了辣椒幼苗的抗病性,其中以1mmol.L-1处理抗病性最好,病情指数比对照降低了49.88%。

By the methods of laboratory incubation and bioassay, a simulation test was conducted to study the allelopathic effects of different concentration diisobutyl adipate on pepper seed germination and its seedling growth and Fnsarium oxysporum f. sp. vasinfectum. For the pepper seed germination and seedling growth, diisobutyl adipate exhibited allelopathic promotion at low concentration, but allelopathic inhibition at high concentration. There existed greater differences in the allelopathic effects of diisobutyl adipate on the seed germination and seedling growth of pepper and eggplant. The promotion effects of low concentration diisobutyl adipate on pepper were stronger than those on eggplant, while the inhibition effects of high concentration diisobutyl adipate on pepper were weaker than those on eggplant. All test concentration diisobutyl adipate had significant inhibition effects on the mycelium growth of Fusarium oxysporum f. sp. vasinfectum, and the effects increased with increasing diisobutyl adipate concentration, being the strongest （an inhibitory rate of I0. 75% ） at 1 mnol · L^-1. Field text indicated that diisobutyl adipate at all test concentrations enhanced the disease resistance of pepper seedlings. The best effect was observed at 1 mmol· L^-1 of diisobutyl adipate, with the disease index decreased by 49. 88%, compared to the control.