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Search Results: 1 - 10 of 51147 matches for " QIAO Yun-Zhou "
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Responses of crown architecture and competition of birch seedlings (Betula albosinensis) to enriched CO2 under different planting densities

QIAO Yun-Zhou,WANG Kai-Yun,ZHANG Yuan-Bin,

生态学报 , 2007,
Abstract: Crown structure and competition of red birch seedlings were studied after one year exposure to ambient (AC) and elevated (EC) CO2 concentration under Low (LD) and high (HD) planting density. Crown width, crown depth, branch number, branch angle and length were measured and derivative indices such as crown surface area, crown volume, leaf number and distribution were also examined. Crown width, crown depth, crown surface area and crown volume were all stimulated by elevated CO2 and reduced by elevated planting density. The results showed that the effect of elevated CO2 was higher under low planting density than under high density and the effect of elevated planting density was greater under elevated than under ambient CO2. LDcpa(leaf number per unit projected crown area), LDcv(leaf number per unit crown volume ) and branch angles from the bottom branch group of tree crown were negatively affected by both elevated CO2 and planting density. Effect of elevated CO2 on branch length was related to branch position on the main stem. In conclusion, elevated plant density could reduce the positive effect of elevated CO2 and the addition of elevated CO2 might alleviate the negative effect of elevated plant density on crown features. The smaller LDcpa indicated that leaves were less overlapped and self-shaded under elevated CO2, and the lower LDcv suggests that leaves in crown under elevated CO2 were less crowded than that under ambient CO2. Thus conclusion could be drawn that competitive pressure in crown was prone to be alleviated but not intensified through the effect of elevated CO2, due to the fast extending of crown width and crow depth resulted from stimulated growth.
Silencing the SpMPK1, SpMPK2, and SpMPK3 Genes in Tomato Reduces Abscisic Acid—Mediated Drought Tolerance
Cui Li,Jian-Min Yan,Yun-Zhou Li,Zhen-Cai Zhang,Qiao-Li Wang,Yan Liang
International Journal of Molecular Sciences , 2013, DOI: 10.3390/ijms141121983
Abstract: Drought is a major threat to agriculture production worldwide. Mitogen-activated protein kinases (MAPKs) play a pivotal role in sensing and converting stress signals into appropriate responses so that plants can adapt and survive. To examine the function of MAPKs in the drought tolerance of tomato plants, we silenced the SpMPK1, SpMPK2, and SpMPK3 genes in wild-type plants using the virus-induced gene silencing (VIGS) method. The results indicate that silencing the individual genes or co-silencing SpMPK1, SpMPK2, and SpMPK3 reduced the drought tolerance of tomato plants by varying degrees. Co-silencing SpMPK1 and SpMPK2 impaired abscisic acid (ABA)-induced and hydrogen peroxide (H 2O 2)-induced stomatal closure and enhanced ABA-induced H 2O 2 production. Similar results were observed when silencing SpMPK3 alone, but not when SpMPK1 and SpMPK2 were individually silenced. These data suggest that the functions of SpMPK1 and SpMPK2 are redundant, and they overlap with that of SpMPK3 in drought stress signaling pathways. In addition, we found that SpMPK3 may regulate H 2O 2 levels by mediating the expression of CAT1. Hence, SpMPK1, SpMPK2, and SpMPK3 may play crucial roles in enhancing tomato plants’ drought tolerance by influencing stomatal activity and H 2O 2 production via the ABA-H 2O 2 pathway.
Effects of light intensity on physiological traits of bamboo(Fargesia denudata)and poplar(Populus cathayana) during leaf senescence

QIAO Yun-zhou,LIU Meng-yu,WANG Kai-yun,ZHANG Yuan-bin,

浙江大学学报(农业与生命科学版) , 2008,
Abstract: 为明确川西亚高山强光照环境对植物生长后期叶片衰老生理的影响,通过(30±2.5)%遮荫处理,研究缺苞箭竹(Fargesia denudata)和青杨(Populus cathayana)叶片的光合速率、光合色素和可溶性蛋白含量的变化,并对丙二醛(MDA)含量、保护酶超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活性进行测定.结果表明,随着光强的降低,光合速率、可溶性蛋白和光合色素含量增加,MDA含量下降,保护酶SOD、CAT活性升高,说明在光照强烈的亚高山地区,适当减少光照有利于减缓植物叶片的衰老,使叶片维持较高的光合速率.此外,相同光照条件下,青杨的光合速率、可溶性蛋白含量、光合色素含量、SOD、CAT活性均高于缺苞箭竹,而MDA含量表现相反,说明光合速率及与植物衰老有关的生理指标均因物种而有所差异.缺苞箭竹和青杨是该地区暗针叶林生态恢复和演替过程中的主要植物种,物种间对光照强度响应的差异将影响它们在森林群落中的生态位以及生态群落的演替过程.

WU Fu-zhong,WANG Kai-yun,YANG Wan-qin,LU Ye-Jiang,QIAO Yun-Zhou,

植物生态学报 , 2005,
Abstract: 研究了一个生长季节内,缺苞箭竹(Fargesia denudata)-紫果云杉(Picea purpurea)原始林下不同密度缺苞箭竹凋落物及其生物元素含量的动态,比较了凋落物与新鲜叶中生物元素含量的差异,探讨了生物元素在缺苞箭竹体内的潜在内转移能力.研究结果表明:在生长季节内,缺苞箭竹凋落物量随着缺苞箭竹密度增加而增大.凋落物中C、N、P、K含量随着缺苞箭竹密度增加而减小,但Ca、Mg含量随着缺苞箭竹密度增加而增大.凋落物和新鲜叶中的C含量无显著差异,且二者均无明显的季节变化规律;凋落物的N、P、K含量表现为在5、6、7月依次升高,7月以后逐渐下降的格局,且凋落物中的含量明显低于新鲜叶;凋落叶的Ca含量明显高于新鲜叶,但无明显的季节变化规律;凋落叶的Mg含量在缺苞箭竹指数生长期最低,而新鲜叶中Mg含量在缺苞箭竹指数生长期最高.缺苞箭竹密度对生物元素的动态变化规律无显著影响.内转移率表现为K>N>P,且P的内转移率随着缺苞箭竹密度的增加而升高,但缺苞箭竹密度对K、N的内转移能力影响较小;C在缺苞箭竹植株体内的内转移现象不明显;Ca在凋落物中的积累率随缺苞箭竹密度增加而增大;Mg元素的积累率随着缺苞箭竹密度增加越来越高,而内转移率越来越低.
Water use efficiency of winter wheat in ridge cultured wheat||spinach-tomato cropping system

QIAO Yun-Zhou,RUAN Fen,DONG Bao-Di,SHI Chang-Hai,ZHAI Hong-Mei,LIU Meng-Yu,

中国生态农业学报 , 2011,
Abstract: Ridge planting and intercropping of winter wheat (Triticum aestivum L.) are important cropping systems in the North China Plain (NCP), in which there exists an acute shortage of water resources especially for crop production. This study analyzed water use efficiency (WUE) of winter wheat in wheat||spinach-tomato cropping system using both traditional and ridge cultivation as the control practices. Traditional cultivated spinach (Spinacia oleracea L.) and tomato (Lycopersicon esculentum Miller) system was the control cropping practice for the spinach||tomato intercropping system. The results showed that wheat grain yield under ridge planting and intercropping was 11% less than under traditional cultivation (401 kg·667m-2). The reduction in grain yield was attributed to low tiller number as ridge-edge effect was not fully exploited. Tiller numbers of ridge-planted ridge-intercropped wheat were 13.2% and 8.2% less than traditional cultivated wheat system. Row tiller number was much less in either ridge-planted or ridge-intercropped systems than in traditional cultivation system. Comparisons among the three cropping systems suggested that traditional wheat cropping had the highest WUE (1.039 kg·667m-2·mm-1), and that intercropping had the lowest WUE (0.868 kg 667m-2·mm-1). Ridge cultivation had a smaller WUE (0.944 kg·666.7m-2·mm-1) than traditional cultivation system because between- ridge water was not fully utilized. Yield of spinach was, however, not affected by wheat. Yields of intercropped and traditional cultivation spinach systems were 826 kg·667m-2 and 851 kg·667m-2, respectively, with a difference not statistically significant. However, tomato growth was greatly hampered under the intercropping system. Stem diameter and biomass per plant under intercropped tomato was respectively 27% and 37% less than that under traditional cultivation system. This suggested that after spinach harvest, tomato transplanting should be postponed as long as possible so as to shorten crop symbiosis and make the cropping system more manageable. It was therefore concluded that wheat||spinach-tomato cropping system facilitated di-season vegetable and food production, provided that the wheat and vegetable cultivars were properly selected and cultivated.
Research progress in soil water/salt dynamics and crop growth under saline water irrigation

YANG Jing,YANG Ming-Xin,DONG Bao-Di,QIAO Yun-Zhou,SHI Chang-Hai,ZHAI Hong-Mei,LIU Meng-Yu,

中国生态农业学报 , 2011,
Abstract: Fresh water resource is scarce and unevenly distributed in China. The use of saline water is therefore an effective way of solving the fresh water shortage. This article summarized the impacts of saline water irrigation on water/salt movement in soil, and on crop growth and changes in crop physiological metabolism. It discussed water/salt distribution in the soil profile, the effect of different degrees of saline water on water/salt movement, and the role of irrigation methods on salt distribution in soil. The paper also epitomized the effects of saline water irrigation on the growth, yield and quality of crops. It further noted effects of saline water irrigation on physiological metabolism; including the changes in praline content, antioxidant enzyme activities, malondialdehyde content, chlorophyll content and photosynthesis.
Analysis of water use efficiency of different winter wheat cultivars under different irrigation schemes on the basis of yield

DONG Bao-Di,SHI Chang-Hai,QIAO Yun-Zhou,YANG Jing,ZHAI Hong-Mei,LI Dong-Xiao,LIU Meng-Yu,

中国生态农业学报 , 2011,
Abstract: Five drought tolerant winter wheat cultivars were used to evaluate the differences in the effects of harvest index (HI) and biomass water use efficiency (WUEbm) on grain yield water use efficiency (WUEy) under different irrigation schemes. The wheat cultivars included dryland cultivars of "Xifeng 20" and "Jinmai 47", dry/wetland cultivar of "Shijiazhuang 8", and wetland cultivars of "Shi 4185" and "Kenong 9204". The results showed significant differences in WUEy and its changing trends among different drought tolerant wheat cultivars. Dryland cultivars had significantly lower WUEy than wetland and wet/dryland cultivars, with the highest WUEy difference of 42.01%. Average water consumption of the drought tolerant wheat cultivars was 343~350 mm. No significant difference was noted in the amount of water consumption among different cultivars. This suggested that although dryland cultivars were drought tolerant, it did not limit the rate of water consumption. It also suggested that the main factor of WUEy was WUEbm and HI. Dryland cultivars had significantly lower HI than wetland and wet/dryland cultivars, with the highest HI difference of 25.91%. Significant positive correlations were noted between HI and WUEy, and between WUEbm and WUEy. The correlation between plant height and HI was negative (R2 = 0.574). Under no irrigation, no obvious difference was noted in WUEbm among different cultivars. Dryland cultivars had lower HI than the other cultivars. The difference in WUEy among different cultivars was driven by the differences in HI. Under supplemental irrigation conditions, however, wetland and wet/dryland cultivars had higher WUEbm and HI than dryland cultivars. The differences in WUEy came mainly from interactive effects of HI and WUEbm. The results suggested that different drought-tolerant wheat cultivars had responded differently to the same condition and therefore had different adaptation strategies to environmental conditions. Dryland cultivars enhanced WUEbm which in turn led to higher WUEy in extreme drought conditions. Wetland and wet/dryland cultivars, on the other hand, enhanced HI and WUEbm to yield higher WUEy under supplemental irrigation conditions.
Effect of brackish water on winter wheat seed germination and seedling growth

SHI Chang-Hai,LI Yu-Xin,ZHAI Hong-Mei,YANG Jing,LI Dong-Xiao,DONG Bao-Di,QIAO Yun-Zhou,LIU Meng-Yu,

中国生态农业学报 , 2011,
Abstract: Despite the abundance of brackish water in the Bohai Sea region,seasonal(winter and spring) drought is persistent in north China.A pot experiment was therefore conducted to explore the use of brackish water in irrigation before winter wheat sowing or in winter irrigation.Three winter wheat cultivars(irrigated/dry land cultivar Shijiazhuang 8,dry land cultivar Jinmai 47 and salt-resistant cultivar Xiaoyan 81),ecologically adapted to the North China,were used in the study.The modes of seed germination,seedlin...
Yun-Zhou Jin,Rong-Hua Zhang,Da-Xu Fu,Yao-Kang Lv
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811020265
Abstract: The title compound, C18H16ClNO2, is the main product of a photoreaction. The two benzene rings make a dihedral angle of 86.40 (2)° with each other. The 1,3-oxazepine C atom to which the 4-chlorophenyl group is attached and the C atom of the 4-chlorophenyl group attached to the 1,3-oxazepine ring are chiral C atoms, but the crystal is a racemate in which the enantiomers are linked by a pair of weak intermolecular C—H...O hydrogen bond, forming an inversion dimer.
Yun-Zhou Jin,Rong-Hua Zhang,Da-Xu Fu,Yao-Kang Lv
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681102647x
Abstract: The asymmetric unit of the title compound, C13H15NO2, the main product of a photoreaction, contains two crystallographically independent molecules. In both molecules, the conformation of the seven-membered ring is twist sofa and that of the five-membered rings is envelope. In the crystal, molecules are linked by weak intermolecular C—H...O hydrogen bonds.
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