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Effects on antioxidant enzyme activities and osmolytes in Halocnemum strobilaceum under salt stress

Research in Cold and Arid Regions 2016年第1期8卷 65-71页

作者： TianPeng Gao Rui Guo XiangWen Fang ZhiGang Zhao GuoHua Chang YinQuan Chen Qing Zhang centre of urban ecology and environmental bioteehnology Lanzhou City UniversityLanzhouGansu 730070China State Key Laboratory of Grassland Agro-ecosystems Institute of Arid AgroecologySchool of Life SciencesLanzhou UniversityLanzhouGansu 730000China School of Chemistry and Environment Sciences Lanzhou City UniversityLanzhouGansu 730070China

The seedlings of Halocnermum strobilaceum were cultivated in 0.5% hoagland nutrient solution containing 0.0%, 0.9%, 2.7% and 5.4% of NaC1 as well as composite salt （Na^＋, Ca^2＋, K^＋, Si^4＋） for 20 days; all the contents are in weight ratio. Succulent level, inorganic ions （Na^＋, K^＋）, organics such as betaine, proline, malondialdehyde, and antioxidant enzyme activities including superoxide dismutase （SOD）, catalase （CAT）, peroxidase （POD）, betaine aldehyde dehydrogenase （BADH） were measured to reveal its salt tolerance mechanism. When the composite salt concentration reaches 5.4%, SOD activity level, and MDA content is five times the control group; when it reaches 2.7%, the succulent level of seedlings, and the content ofK＋ in roots is nearly two times the NaCl treatment; the dry weight is more than three times the control group; with the NaCl treatment, MDA is three times the contrast; when the salt concentration is 2.7%, POD reaches the maximum. Results indicate that Si^4＋, K^＋, and Ca^20 from composite salt in the roots of H. strobilaceum improved the water-holding capacity. The activities of antioxidant enzyme were raised by the accumulation ofproline and betaine, which increased the salt tolerance. The absorption of K^＋ promoted the high ratio of K^＋/Na^＋ and alleviated the damage of cell membranes of H. strobilaceum, which is associated with osmotic contents such as betaine and proline.

关键词： Halocnermum strobilaceum (Pall.) salt stress succulent antioxidant enzyme activities

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Effects of dietary supplementation of Ulva pertusa and non-starch polysaccharide enzymes on gut microbiota of Siganus canaliculatus

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Journal of Oceanology and Limnology 2018年第2期36卷 438-449页

作者： ZHANG Xinxu WU Huijuan LI Zhongzhen LI Yuanyou WANG Shuqi ZHU Dashi WEN Xiaobo LI Shengkang Guangdong Provincial Key Laboratory of Marine bioteehnology Shantou University Shantou 515063 China Marine Biology Institute Shantou University Shantou 515063 China

Fishes represent the highest diversity of vertebrates; however, our understanding of the compositions and functions of their gut microbiota is limited. In this study, we provided the first insight into the gut microbiota of the herbivorous fish Siganus eanalieulatus by using three molecular ecology techniques based on the 16S rRNA genes （denaturing gradient gel electrophoresis, clone library construction, and high- throughput Illumina sequencing）, and the Illumina sequencing technique is suggested here due to its higher overall coverage of the total 16S rRNA genes. A core gut microbiota of 29 bacterial groups, covering 〉99.9% of the total bacterial community, was found to be dominated by Proteobacteria and Firmicutes in fish fed three different diets with/without the supplementation of Ulva pertusa and non-starch polysaccharide （NSP） enzymes （cellulase, xylanase, and [3-glucanase）. Diverse potential NSP-degrading bacteria and probiotics （e.g., Ruminococcus, Clostridium and Lachnospiraceae） were detected in the intestine of the fish fed U. pertusa, suggesting that these microorganisms likely participated in the degradation of NSPs derived from U. pertusa. This study supports our previous conclusion that U. pertusa-based diets are suitable for the production ofS. eanaliculatus with lower costs without compromising quality.

关键词： aquaculture gut microbiota Siganus canaliculatus 16S rRNA gene Ulvapertusa

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