Chaetominine, (+)-alantrypinone, questin, isorhodoptilometrin, and 4-hydroxybenzaldehyde produced by the endophytic fungus Aspergillus sp. YL-6 inhibit wheat ( Triticum aestivum ) and radish ( Raphanus sativus ) germination

[摘要] Five phytotoxic substances with allelopathic activity were isolated from endophytic fungi Aspergillus sp. YL-6 habited in Pleioblastus amarus . The chemical structures of these substances were determined as chaetominine ( 1 ), (+)-alantrypinone ( 2 ), questin ( 3 ), isorhodoptilometrin ( 4 ), and 4-hydroxybenzaldehyde ( 5 ) by nuclear magnetic resonance and mass spectrometry data. The potential allelopathic effects of compounds 1–5 were evaluated on wheat ( Triticum aestivum ) and radish ( Raphanus sativus ). Under lab condition, at concentrations of 10 and 20 ppm, compounds 1–5 inhibit the germination and growth of the two tested seeds completely. An idole-3-acetic acid (IAA) derivative, (+)-alantrypinone ( 2 ) displayed the best inhibitory effects on radish seeds among these tested compounds with the similar activity as the positive control glyphosate, a broad-spectrum systemic herbicide. In the further evaluation of compounds 1–5 , Questin ( 3 ), an anthraquinone derivative, can inhibit shoot and root elongation of wheat, the inhibitory effects assessed were similar to the positive control glyphosate.

[学科分类] 纳米科学和纳米技术

[关键词] Pleioblastus amarus;Aspergillus sp;YL-6;herbicides;allelochemicals