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| 1 | Bacterial diversity and distribution in the southeast edge of the Tengger Desert and their correlation with soil enzyme activities显示文摘The nature of microbial communities and their relation to enzyme activities in desert soils is a neglected area of investigation. To address this, the bacterial diversity and distribution and soil physico-chemical factors were investigated in the soil crust, the soil beneath the crust and rhizosphere soil at the southeast edge of the Tengger Desert, using the denaturing gradient gel electrophoresis of 16S rRNA genes amplified by the polymerase chain reaction. Phylogenetic analysis of the sequenced DGGE bands revealed a great diversity of bacteria. The Proteobacteria, consisting of the α, β, and γ subdivisions, were clearly the dominant group at all depths and in rhizosphere soil. Analysis of the enzyme activities indicated that the rhizosphere soil of Caragana korshinskii exhibited the highest protease and polyphenol oxidase activities, and in the soil crust there were increased activities of catalase, urease, dehydrogenase and sucrase. The bacterial community abundance closely correlated with soil enzyme activities in different soils. The presence of Cyanobacteria correlated with significant increases in protease, catalase and sucrase in the soil crust, and increased urease in the rhizosphere soil of Artemisia ordosica. The occurrence of Acidobacteria was associated with significant increases in urease, dehydrogenase, and sucrase in the rhizosphere soil of C. korshinski. The presence of γ-Proteobacteria correlated with a significant increase in polyphenol oxidase in the rhizosphere soil of A. ordosica. The study indicated a close relationship between the soil bacterial community and soil enzymes, suggesting the necessity of further investigations into bacterial function in this desert ecosystem. | Wei Zhang Gaosen Zhang Guangxiu Liu Zhibao Dong Tuo Chen Manxiao Zhang Paul J.Dyson Lizhe An | 2012 | Journal of Environmental Sciences2012，24，11： | 14 |
| 2 | Ethylene Production and 1-Aminocyclopropane-l-Carboxylate (ACC) Synthase Gene Expression in Tomato ( L ycopsicon esculentum Mill.) Leaves Under Enhanced UV-B Radiation显示文摘西红柿(Lycopsicon esculentum 米尔) 在一个温室种的植物与 UV-B 的二个不同层次被照耀,也就是 8.82 (T1 ) 并且 12.6 kJ/m2 每天(T2 ) 。乙烯生产, 1-aminocyclopropane-1-carboxylate (ACC ) 内容, 1-(malonylamino ) cyclopvopane-1-carboxylic 酸(MACC ) 内容, ACC synthase (EC 4.4.1.14 ) 的基因表示,和在西红柿叶子的 ACC oxidase 活动是坚定的。结果显示了那个 ACC 内容, ACC synthase 的活动和 ACC oxidase,并且乙烯生产在 UV-B 放射的低剂量下面连续地增加了,而在放射的高剂量这些参数在开始的 12 d 期间增加了然后开始减少。MACC 内容在 UV-B 照耀的两剂量下面在 18 d 上连续地增加了。在 ACC 内容, ACC synthase 活动, ACC oxidase 活动, ACC synthase 基因的 transcriptional 水平,和乙烯生产的变化与对方一致,建议 ACC synthase 在在 UV-B 放射下面的西红柿叶纸巾是在乙烯生合成和那乙烯生产的关键酶能被 ACC synthase 基因的表示调整。结果也显示在乙烯新陈代谢的变化可以是到提高的 UV-B 放射的适应机制。 | Lizhe An Xiaofeng Xu Hongguan Tang Manxiao Zhang Zongdong HOU Yanhong Liu Zhiguang Zhao Huyuan Feng Shijian Xu Xunling Wang | 2006 | Journal of Integrative Plant Biology2006，48，10： | 2 |
| 3 | Effects of nitric oxide on growth of maize seedling leaves in the presence or absence of ultraviolet-B radiation显示文摘 | Lizhe An Yanhong Liu Manxiao Zhang Tuo Chen Xunling Wang | 2004 | Journal of Plant Physiology2004，，3： | 1 |
| 4 | Effects of nitric oxide on growth of maize seedling leaves in the presence or absence of ultraviolet-b radiation 显示文摘 | An Lizhe Liu Yanhong Zhang Manxiao | 2005 | Journal of Plant Physiology2005，162，3： | 1 |
| 5 | Foliar carbohydrate differs between Picea crassifolia and Sabina przewalskii with the altitudinal variation of Qilian Mountains, China显示文摘Nonstructural carbohydrates(NSC) and nitrogen metabolism strongly influence growth and development in plants. The biosynthesis of cellulose and lignin(structural carbohydrates, SC) depends largely on the supply of NSC. We desire to examine which hypothesis, carbon limitation or growth limitation, best fits the alpine plant response between NSC, SC, carbon(C), nitrogen(N) and altitude. We compared the foliar concentrations of carbohydrates, C and N between the leaves of Picea crassifolia(lower-elevation tree-line species) and Sabina przewalskii(high-elevation tree-line species) in their response to changing elevation. Our site was located in the mid-northern area of Qilian Mountains, China. We found that foliar soluble sugar(SG) concentrations were significantly higher in P. crassifolia than in S. przewalskii at the 2,700–3,400 m level. Foliar NSC levels in P. crassifolia increased at the 2,700–3,100 m level, indicating that growth was limited gradually resulting in a surplus of NSC(to conform to GLH), subsequently decreasing at the 3,100–3,400 m level, the assimilation declined leading to C deficit(to conform to CLH). SC(SC metabolism disorders at 3,100–3,400 m), C, N and starch were significantly lower in P. crassifolia than in S. przewalskii. Conversely, foliar SG concentration shows a fall-rise trend with increasing elevation for S. przewalskii. SC concentration in S. przewalskii leaves decreased with an increase of elevation and has a significantly positive correlation to N concentration marking the assimilation of plants. Therefore, the high-elevation tree-line species(S. przewalskii) utilize or store more foliar SG leading to a decrease of SG concentration for survival and growth/regrowth in an adverse environment, higher total C, N, SC, starch contents and lower NSC level. Also, their change trends along the elevational gradient in leaves of S. przewalskii indicate better assimilation strategies for SG use under environmental stress compared to P. crassifolia. This indicates that foliar C metabolism along the elevation follows the principle of the growth-limitation hypothesis(GLH) or carbon limitation hypothesis(CLH), which depends on the acclimation of different alpine life-forms to the environment. | ManXiao Zhang HuiJuan Pei YouFu Zhang Tuo Chen GuangXiu Liu | 2015 | Research in Cold and Arid Regions2015，7，2： | 0 |
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