Bambusa pervariabilis Dendrocalamopsis grandis blight is caused by a toxin from the fungus Arthrinium phaeospermum (corda) M. B. Ellis. We used shaking culture in a modified Fries culture medium and methanol extrac...Bambusa pervariabilis Dendrocalamopsis grandis blight is caused by a toxin from the fungus Arthrinium phaeospermum (corda) M. B. Ellis. We used shaking culture in a modified Fries culture medium and methanol extraction to isolate the toxin. The optimal developing solvent mixture (methanol: ethyl acetate: H20 at 7:1.5:3) was selected using thin layer chromatography and used as the eluent for toxin purification by silica gel column chromatography. Two toxic fractions were identi- fied in the bioassay. A flaxen oil substance, AP-I, showed higher toxicity than a toxic white powder, AP-II. The more toxic AP-I was determined to be dibutyl phthalate (C16H2204, molecular weight of 278) by mass spectrome- try, nuclear magnetic resonance, and infrared spectropho- tometry. Dibutyl phthalate might contribute to the pathogenesis of bamboo blight.展开更多
利用标准样方法研究了吊丝单竹(Dendrocalamopsis vario-striata)林的碳储量及其空间分布特征。结果表明,吊丝单竹不同器官的碳密度为0.4684-0.5092 g g-1,依次为竹秆>竹蔸>竹根>竹枝>竹叶;碳储量在吊丝单竹不同器官中的分...利用标准样方法研究了吊丝单竹(Dendrocalamopsis vario-striata)林的碳储量及其空间分布特征。结果表明,吊丝单竹不同器官的碳密度为0.4684-0.5092 g g-1,依次为竹秆>竹蔸>竹根>竹枝>竹叶;碳储量在吊丝单竹不同器官中的分配以竹秆最大(达50.46%),其次为竹蔸(20.71%),竹叶的最小(仅5.01%)。整个吊丝单竹林生态系统碳库主要由乔木层、灌草层、枯落物层和土壤层4部分组成,总碳贮量为104.9321 t hm-2,其空间分布为土壤层>乔木层>枯落物层>灌草层,其中土壤层占总碳储量的比例最大(59.74%);整个吊丝单竹林乔木层年固碳量为6.4460 t hm-2a-1,相当于每年同化CO2的量为23.6353 t hm-2 a-1,这略低于我国森林植被的平均年固碳量,表明吊丝单竹林还有较大的发展空间。展开更多
基金supported by the National Natural Science Foundation of China(31070578)the National Natural Science and Technology Resources Sharing Platform of China(2005DKA21207-13)
文摘Bambusa pervariabilis Dendrocalamopsis grandis blight is caused by a toxin from the fungus Arthrinium phaeospermum (corda) M. B. Ellis. We used shaking culture in a modified Fries culture medium and methanol extraction to isolate the toxin. The optimal developing solvent mixture (methanol: ethyl acetate: H20 at 7:1.5:3) was selected using thin layer chromatography and used as the eluent for toxin purification by silica gel column chromatography. Two toxic fractions were identi- fied in the bioassay. A flaxen oil substance, AP-I, showed higher toxicity than a toxic white powder, AP-II. The more toxic AP-I was determined to be dibutyl phthalate (C16H2204, molecular weight of 278) by mass spectrome- try, nuclear magnetic resonance, and infrared spectropho- tometry. Dibutyl phthalate might contribute to the pathogenesis of bamboo blight.
文摘利用标准样方法研究了吊丝单竹(Dendrocalamopsis vario-striata)林的碳储量及其空间分布特征。结果表明,吊丝单竹不同器官的碳密度为0.4684-0.5092 g g-1,依次为竹秆>竹蔸>竹根>竹枝>竹叶;碳储量在吊丝单竹不同器官中的分配以竹秆最大(达50.46%),其次为竹蔸(20.71%),竹叶的最小(仅5.01%)。整个吊丝单竹林生态系统碳库主要由乔木层、灌草层、枯落物层和土壤层4部分组成,总碳贮量为104.9321 t hm-2,其空间分布为土壤层>乔木层>枯落物层>灌草层,其中土壤层占总碳储量的比例最大(59.74%);整个吊丝单竹林乔木层年固碳量为6.4460 t hm-2a-1,相当于每年同化CO2的量为23.6353 t hm-2 a-1,这略低于我国森林植被的平均年固碳量,表明吊丝单竹林还有较大的发展空间。