A new epipolythiodioxopiperazine （ETP）, asperterzine （1）, along with two known analogs, bisdethiobis （methylthio）-acetylaranotin （2） and bisdethiobis（methylthio）-acetylapoaranotin （3）, was isolated from th...A new epipolythiodioxopiperazine （ETP）, asperterzine （1）, along with two known analogs, bisdethiobis （methylthio）-acetylaranotin （2） and bisdethiobis（methylthio）-acetylapoaranotin （3）, was isolated from the plant endophytic fungus Aspergillus terreus PR-P-2. The structure elucidation of 1 was accomplished by a combination of spectral methods and electronic circular dichroism （ECD） spectrum. Asperterzine （1） was a symmetric aromatized ETP found as a natural product for the first time. Compounds 2 and 3 showed strong cytotoxicity against HL-60 cell line. The putative biosynthetic pathway of 1 was also detailed in the text.展开更多
Piriformospora indica, a root-colonizing endophytic fungus of Sebacinales, promotes plant growth and confers resistance against biotic and abiotic stresses. In order to confirm the influence of P. indica on growth, pr...Piriformospora indica, a root-colonizing endophytic fungus of Sebacinales, promotes plant growth and confers resistance against biotic and abiotic stresses. In order to confirm the influence of P. indica on growth, proline, malondialdehyde（MDA）, chlorophyll, and cadmium（Cd） amounts in Nicotiana tabacum under Cd stress, hydroponics, pot and field trials were conducted. The results showed that P. indica can store Cd in plant roots and reduce leaf Cd content, reduce the concentration of MDA, and increase the proline and chlorophyll content and the activities of catalase, peroxidase, and superoxide dismutase under hydroponic Cd stress. RT-PCR analysis showed that the relative expression level of genes Gsh2, Ta PCS1, oas1, GPX, and Hsp70 in colonized plants was 4.3, 1.4, 2.9, 1.7, and 6.9fold higher than in un-colonized plants respectively. Cd exposure significantly reduced un-colonized plants＇ agronomic traits compared to P. indica-colonized ones. Our results suggested that P. indica can sequester Cd in roots, so that much less cadmium was transported to leaves, and the increased concentrations of antioxidant enzymes, pigments and proline contents, as well as the higher expression of stress-related phytochelatin biosynthesis genes in P. indica-inoculated plants, may also serve to protect N. tabacum plants against oxidative damage, enhancing Cd tolerance.展开更多
基金supported by the Fund of Natural Science of Liaoning Province(No. 2015020730)supported by Program for Innovative Research Team of the Ministry of EducationProgram for Liaoning Innovative Research Team in University
文摘A new epipolythiodioxopiperazine （ETP）, asperterzine （1）, along with two known analogs, bisdethiobis （methylthio）-acetylaranotin （2） and bisdethiobis（methylthio）-acetylapoaranotin （3）, was isolated from the plant endophytic fungus Aspergillus terreus PR-P-2. The structure elucidation of 1 was accomplished by a combination of spectral methods and electronic circular dichroism （ECD） spectrum. Asperterzine （1） was a symmetric aromatized ETP found as a natural product for the first time. Compounds 2 and 3 showed strong cytotoxicity against HL-60 cell line. The putative biosynthetic pathway of 1 was also detailed in the text.
基金supported by the China Tobacco Guizhou Industrial Co., Ltd.(No. 201216)
文摘Piriformospora indica, a root-colonizing endophytic fungus of Sebacinales, promotes plant growth and confers resistance against biotic and abiotic stresses. In order to confirm the influence of P. indica on growth, proline, malondialdehyde（MDA）, chlorophyll, and cadmium（Cd） amounts in Nicotiana tabacum under Cd stress, hydroponics, pot and field trials were conducted. The results showed that P. indica can store Cd in plant roots and reduce leaf Cd content, reduce the concentration of MDA, and increase the proline and chlorophyll content and the activities of catalase, peroxidase, and superoxide dismutase under hydroponic Cd stress. RT-PCR analysis showed that the relative expression level of genes Gsh2, Ta PCS1, oas1, GPX, and Hsp70 in colonized plants was 4.3, 1.4, 2.9, 1.7, and 6.9fold higher than in un-colonized plants respectively. Cd exposure significantly reduced un-colonized plants＇ agronomic traits compared to P. indica-colonized ones. Our results suggested that P. indica can sequester Cd in roots, so that much less cadmium was transported to leaves, and the increased concentrations of antioxidant enzymes, pigments and proline contents, as well as the higher expression of stress-related phytochelatin biosynthesis genes in P. indica-inoculated plants, may also serve to protect N. tabacum plants against oxidative damage, enhancing Cd tolerance.
