甘菊水培体系的建立     

牛雅静  黄河  杨可  王斌  戴思兰 《中国园艺文摘》2011,27(11):1-3,26

为探索甘菊[Chrysanthemum lavandulifolium(Fisch. ex Trautv.)Makino]在非生物胁迫下以及营养物质代谢中精准的生理、基因表达变化机理,研究通过筛选外植体的种类和营养液的浓度,建立了甘菊水培体系。结果表明:水培中,播种苗的成活率和生根率极显著高于1年生大苗和茎段插条;在长时间的水培中,使用标准Hoagland和1.5倍Hoagland培养液,其畸形叶率极显著低于1/2和1/4Hoagland培养液,并且株高极显著高于另外2个浓度。结合科研需求,认为组培播种苗、标准Hoagland营养液是甘菊水培的最佳外植体和培养条件。  相似文献   

不同扦插基质对吊兰水生根生成的影响     

袁桂英 《北方园艺》2010,(21):119-120

以吊兰为试材,研究不同扦插基质对吊兰水生根生成的影响。结果表明:吊兰分株在细沙中扦插,且细沙常处于水分饱和状态,根系2~3 cm时定植到水中,有利于水生根生成。  相似文献   

Daily macronutrient uptake patterns in relation to plant age in hydroponic lettuce     

Francisco Albornoz  J. Heinrich Lieth 《Journal of plant nutrition》2016,39(10):1357-1364

A greenhouse experiment was conducted to study and quantify the daily uptake rate of nitrate, ammonium, phosphoric acid, potassium, calcium, magnesium, and sulfate (NO₃^?, NH₄⁺, H₂PO₄^?, K⁺, Ca²⁺, Mg²⁺ and SO₄^2?) and to characterize the uptake daily pattern at different plant ages in a lettuce crop. The uptake rates per gram of plant fresh weight were calculated at 2-hour intervals through sampling the nutrient solution and analyzing it by NO₃^?/NH₄⁺ conductivity and inductively coupled plasma atomic emission spectrometry (ICP-AES). The uptake rate of nitrogen, phosphorus and potassium (N, P and K) per unit mass of plant decreased with plant age following a reduction in plant relative growth rate. No significant differences were found in the absorption of Ca, Mg and sulfur (S) between the different weeks of growth. The daily absorption patterns showed no preference for the absorption of any of the ions during the daytime. A significant reduction in the absorption peaks of all the ions with increasing plant age was observed.  相似文献   

蔬菜水培系统的改进设计及应用试验   总被引：1，自引：0，他引：1  

王玉彦  朱国鹏  张柱岐 《吉林农业大学学报》2009,31(4)

针对目前生产中推广应用的蔬菜水培装置存在的营养液温度偏低,根系缺氧等难题,对传统的蔬菜水培系统进行改进设计,并对其性能和效果进行了试验.结果表明:改进后水培系统的栽培槽能够充分吸收传导太阳辐射能,较好地积蓄热量,使营养液温度提高3～8℃,即使在低温季节营养液温度仍能保持在15℃以上;回液槽能够使回流的营养液多次产生落差碰撞,增加了营养液溶氧量,栽培槽内能形成根际空气层,使根际氧气供应充足,促进了根系生长;成本造价比传统装置降低30.11%.  相似文献   

茶树对铜的吸收与累积特性   总被引：2，自引：0，他引：2  

李晓林  唐茜  叶善蓉  陈能武  张苏敏  谭和平 《四川农业大学学报》2009,27(1)

通过土壤盆栽和水培试验,研究了铜对茶树生长的影响,铜在茶树中的分布规律及吸收累积特性。结果表明,铜对水培茶树有较强的毒性,铜处理浓度≥3 mg/L时,茶树不仅出现严重的毒害症状,甚至死亡;而土壤铜污染对茶树的生长和光合速率都有明显的抑制作用。茶树吸收的铜大部分被吸收根所固定,向地上部运输的比例较低,根部对阻止土壤中的铜向新梢转移发挥了重要的缓冲及屏障作用。盆栽茶树各部位的铜含量由高到低的分布次序为:吸收根>主根>枝条>主茎>新梢(1芽2叶)>叶片,且各部位的铜含量与土壤外源铜添加量呈极显著正相关关系,而水培茶树的根和叶片的铜含量与铜处理浓度也呈极显著正相关。  相似文献   

新疆棉花铃期植株氮素挥发初步研究     

吕婷婷  徐万里  朱建雯  张殿宇 《新疆农业大学学报》2009,32(2):34-36

采用同位素示踪等方法研究棉花铃期植株氮素挥发的化学成分和各成分损失量。在室内水培条件下,采用密闭生长室抽气法测定棉花植株NH3挥发;应用^15N示踪技术,采用静态箱法测定棉花植株N2和N2O挥发。在抽气速率为0.26m^3／h情况下,棉花植株氨的挥发速率约为48.34μg／g·h。同位素标记时期,在静态箱法测定期,棉花N2的释放速率为3.96μg／g·h干重;N2O的释放速率为4.53μg／g·h干重。棉花铃期可以通过地上植株释放出NH3、N2和N2O。  相似文献   

Analysis of Arsenic Uptake by Plant Species Selected for Growth in Northwest Ohio by Inductively Coupled Plasma–Optical Emission Spectroscopy     

《Communications in Soil Science and Plant Analysis》2012,43(17-18):2505-2517

Abstract

Arsenic (As) contamination is widespread in the industrial areas of northwest Ohio. Plant species that both take up As and are appropriate for the climate and growth conditions of the region are needed for phytoremediation to be successfully employed. Actively growing plants from 22 species of native genera were exposed to As in hydroponics systems (either 0, 10, or 50 mg As L^?1; 1 week) and commercially available potting mix (either 0, 10, 25, 100, or 250 mg As L^?1; 2 weeks), depending on their growth conditions. Aboveground plant tissues were harvested and digested, and concentrations of As were determined by inductively coupled plasma–optical emission spectrometry. The highest tissue concentrations of As (mg As kg^?1 dw) were recorded in seven plant species: Rudbeckia hirta (661), Helenium autumnale (363 in tissues formed after exposure to As), Lupinus perennis (333), Echinacea purpurea (298), Coreopsis lanceolata (258), Lepidium virginicum (214), and Linum lewisii (214). These seven species are ecologically diverse, which suggests that phytoremediation of As using diverse assemblages of plants may be an option for a variety of environments.  相似文献   

Responses of cucumber grown in recirculating nutrient solution to gradual Mn and Zn accumulation in the root zone owing to excessive supply via the irrigation water     

Constantinos Tzerakis  Dimitrios Savvas  Nick Sigrimis 《植物养料与土壤学杂志》2012,175(1):125-134

A standard and a high manganese (Mn) level (10 and 160 μM) were combined with a standard and a high zinc (Zn) level (4 and 64 μM) in the nutrient solution supplied to cucumber in closed‐cycle hydroponic units to compensate for nutrient uptake. The concentrations of all nutrients except Mn and Zn were identical in all treatments. The objectives of the experiment were to establish critical Zn and Mn levels in both nutrient solutions and leaves of cucumber grown hydroponically, to assess the impact of gradual Zn and/or Mn accumulation in the external solution on nutrient uptake and gas exchange, and to find whether Mn and Zn have additive effects when the levels of both ions are excessively high in the root zone. The first symptoms of Mn and Zn toxicity appeared when the concentrations of Mn and Zn in the leaves of cucumber reached 900 and 450 mg kg^–1 in the dry weight, respectively. Excessively high Mn or/and Zn concentrations in the leaves reduced the fruit biomass production due to decreases in the number of fruits per plant, as well as the net assimilation rate, stomatal conductance, and transpiration rate, but increased the intercellular CO₂ levels. Initially, the Mn or Zn concentrations in the recirculating nutrient solution increased rapidly but gradually stabilized to maximal levels, while the corresponding concentrations in the leaves constantly increased until the end of the experiment. The uptake of Mg, Ca, Fe, and Cu was negatively affected, while that of K and P remained unaffected by the external Mn and Zn levels. The combination of high Mn and Zn seems to have no additive effects on the parameters investigated.  相似文献   

二溴海因在水培花卉中的应用研究     

鞠伟琴  ;崔发强  ;赵兰枝 《山东林业科技》2014,(6):16-20

本试验以绿萝为试验材料,研究二溴海因对水培绿藻的抑制作用,并分析了二溴海因在抑藻过程中对营养液和植株生长的影响。结果表明,在不同浓度处理下,二溴海因均能抑制藻类的生长;酸性和中性条件下,二溴海因浓度为50mg/L时抑制效果最好,碱性条件下抑藻最佳浓度为30mg/L;二溴海因处理对绿萝植株生长和营养液溶解氧影响不明显,对营养液电导率有一定的作用,但不超过植物正常生长所适宜的范围。  相似文献   

Comparison of shoot dry weight, Na+ content and δ13C values of ari-e and other semi-dwarf barley mutants under salt-stress     

H. Pakniyat  L.L. Handley  W.T.B. Thomas  T. Connolly  M. Macaulay  P.D.S. Caligari  B.P. Forster 《Euphytica》1997,94(1):7-14

Four breviaristatum (short awned and semi-dwarf) barley mutants; ari-e.1, ari-e.119, ari-e.156 and ari-e.228 were compared with other semi-dwarf mutants; Golden Promise, Alf, Pallas and Diamant along with their non-mutant parents; Bonus, Foma, Maythorpe, Bomi and Valticky, for response to salt stress. Plants were exposed to hydroponic salt treatments (NaCl at 25 and 175 mol m^-3) for 4 weeks, after which response was measured in terms of shoot dry weight, sodium content and δ¹³C. In general ari-e mutants and Golden Promise had significantly lower Na⁺ contents than the other mutants. They also had significantly more negative δ¹³C values than the other lines in stressed (175 mol m^-3 NaCl) conditions. There was a positive correlation (r = 0.71, p < 0.01) between shoot Na⁺ and δ¹³C values so that δ¹³C became less negative with increasing Na⁺ content. Shoot dry weights were compared to shoot Na⁺ and δ¹³C values. The ari-e and Golden Promise mutants showed less reduction in dry matter production in salt stress relative to the control treatment than all the other lines. The data suggest that ari-e mutants and Golden Promise are better adapted to salt stressed environments than the other lines examined. Tests for gibberellic acid sensitivity revealed that ari-e mutants and Golden Promise responded weakly to GA₃, while other dwarf mutants Pallas, Diamant and Alf along with their parents Bonus, Foma, Maythorpe, Valticky and Bomi were highly sensitive. Our results support previous findings that ari-e mutants and the GPert mutant are allelic. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献