检索结果-南通市图书馆

Effects of nitrogen form on growth,CO_2 assimilation,chlorophyll fluorescence,and photosynthetic electron allocation in cucumber and rice plants

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第2期12卷 126-134页

作者： Yan-hong ZHOU Yi-li ZHANG Xue-min WANG Jin-xia CUI Xiao-jian XIA Kai SHI Jing-quan YU Department of Horticulture Zhejiang University Hangzhou 310029 China Key Laboratory of Horticultural Plants Growth Development and Quality Improvement Ministry of Agriculture Hangzhou 310029 China

Cucumber and rice plants with varying ammonium (NH4+) sensitivities were used to examine the effects of different nitrogen (N) sources on gas exchange, chlorophyll (Chl) fluorescence quenching, and photosynthetic electron allocation. Compared to nitrate (NO3-)-grown plants, cucumber plants grown under NH4+-nutrition showed decreased plant growth, net photosynthetic rate, stomatal conductance, intercellular carbon dioxide (CO2) level, transpiration rate, maximum photochemical efficiency of photosystem II, and O2-independent alternative electron flux, and increased O2-dependent alternative electron flux. However, the N source had little effect on gas exchange, Chl a fluorescence parameters, and photosynthetic electron allocation in rice plants, except that NH4+-grown plants had a higher O2-independent alternative electron flux than NO3--grown plants. NO3- reduction activity was rarely detected in leaves of NH4+-grown cucumber plants, but was high in NH4+-grown rice plants. These results demonstrate that significant amounts of photosynthetic electron transport were coupled to NO3- assimilation, an effect more significant in NO3-- grown plants than in NH4+-grown plants. Meanwhile, NH4+-tolerant plants exhibited a higher demand for the reduced form of nicotinamide adenine dinucleotide phosphate (NADPH) for NO3- reduction, regardless of the N form supplied, while NH4+-sensitive plants had a high water-water cycle activity when NH4+ was supplied as the sole N source.

关键词： nitrogen form Photosynthetic electron allocation Alternative electron flux Nitrate reductase

Effects of Rhizosphere Dissolved Oxygen Content and nitrogen form on Root Traits and nitrogen Accumulation in Rice

在线全文

学校读者我要写书评

暂无评论

Rice science 2011年第4期18卷 304-310页

作者： ZHAO Feng XU Chun-mei ZHANG Wei-jian ZHANG Xiu-fu LI Feng-bo CHEN Jian-ping WANG Dan-ying China Nationa l Rice Resea rch Institute Hangzhou 310006China Institute of Applied Ecology Nanjing Agricultura l Univer sityNanjing 210095China Institute of Food Crops Hubei Academy of Agricultura l SciencesWuhan 430064China

Dissolved oxygen and nitrogen form have important effects on rice root growth and nitrogen *** indica hybrid rice,Guodao 1,and a conventional japonica rice,Xiushui 09,were cultured in hypoxic nutrient solution with NH4NO3 or(NH4)2SO4 as the nitrogen source for six weeks in pools.A portion of the Guodao 1 seedlings after treatment in the pools for four weeks were transferred to a split-root system at different dissolved oxygen contents and cultured for an additional two ***,root morphological traits and nitrogen accumulation were *** the low rhizosphere dissolved oxygen content(0-1.0 mg/L),plant biomass was significantly increased under NH4NO3-N supply by about 69% in Guodao 1 and 41% in Xiushui 09 compared with those under NH4+-N *** results were observed for root number,maximum root length,root dry weight and root *** accumulations in roots and shoots were increased by 60% and 52% for Guodao 1,and by 41% and 33% for Xiushui 09,respectively,in the NH4NO3-N *** the split-root system,the high rhizosphere dissolved oxygen content(8.0-9.0 mg/L) promoted root growth and *** biomass was increased by 21.6%,root number by 27%,maximum root length by 14%,and root volume by 10%.Moreover,nitrogen accumulation in roots was increased by 11% under high rhizosphere oxygen *** conclusion,enhanced dissolved oxygen content and combined ammonium-nitrate nitrogen source have positive effects on root growth and nitrogen accumulation of rice plants.

关键词： nitrogen form dissolved oxygen rice root nitrogen accumulation

Effect of nitrogen form on the Activity of Tonoplast Pyrophosphatase in Tomato Roots

在线全文

学校读者我要写书评

暂无评论

Acta Botanica Sinica 2001年第11期43卷 1146-1149页

作者：朱祝军钱亚榕 Wolfgang PFEIFFER 浙江大学农业与生物技术学院园艺系杭州310029 奥地利萨尔茨堡大学植物生理研究所

Effect of nitrate and ammonium on the activity of tonoplast pyrophosphatase (V-PPase) was investigated in the roots of tomato ( Lycopersicon esculentum L.). The results showed that the activity of V-PPase was increased by ammonium nutrition, compared with nitrate nutrition. The H+ transport of tonoplast vesicles by V-PPase was also stimulated by ammonium nutrition. The result of Western blot indicated that the protein amount of V-PPase was increased by ammonium nutrition.

关键词： tomato nitrogen form tonoplast pyrophosphatase

Effects of nitrogen Amount and nitrogen form on 1-deoxynojimycin Content in Mulberry Leaf

在线全文

学校读者我要写书评

暂无评论

Agricultural Science & Technology 2010年第6期11卷 183-185页

作者：殷浩佟万红叶晶晶孙波施新琴刘刚四川省蚕业研究所四川南充637000 四川企业科技开发公司四川南地637000 山东农业大学林学院山东泰安271018 湖北省农业科学院经济作物研究所湖北武汉430064 山东省蚕业研究所山东烟台264002

[Objective] Effects of nitrogen amount and nitrogen form on 1-deoxynojimycin（DNJ）content in mulberry leaf was explored in order to provide a reference for improving DNJ content in mulberry leaf and its medicinal value.[Method] Effects of nitrogen amount（NO-3-N and NH＋4-N）and nitrogen form（NO-3-N/NH＋4-N）on DNJ content in mulberry leaf were studied by changing nitrogen amount and nitrogen form in water culture solution.[Result] DNJ contents in mulberry leaf both increased at first and then decreased with the increase of nitrogen amount,furthermore compared with NH＋4-N,NO-3-N was more beneficial to the accumulation of DNJ;DNJ content in mulberry leaf obviously increased at first and then decreased with the decrease of NO-3-N/NH＋4-N,among them when its rate was 25/75,DNJ content reached the highest.[Conclusion] Proper nitrogen amount and nitrogen form could effectively improve the DNJ content in mulberry leaf.

关键词： Mulberry leaf 1-deoxynojimycin nitrogen amount nitrogen form

nitrogen forms of Maillard Polymers Derived from Xylose and ^(15)N-Labelled Glycine

在线全文

学校读者我要写书评

暂无评论

Pedosphere 1997年第3期7卷 199-206页

作者： CHENGLILI WENQIXIAO 等 InstituteofSoilScience AcademiaSinicaP.O.Box821Nanjing210008（China） InstituteofSoilScience AcademiaS

Water-soluble, nondialyzable Maillard polymers were prepared by reacting D-xylose with 15N-glycine (and/or glycine) at 68 ℃ and pH 8.0 at equimolar concentrations of 1, 0.5 and 0.1 mol L-1, respectively,for 13 days and partitioned into acid-insoluble (MHA) and acid-soluble (MFA) fractions. The nitrogen forms in these polymers were studied by using the 15N cross polarization-magic angle spinning nuclear magnetic resonance (CPMAS NMR) technique in combination with chemical methods. The 15N nuclear magnetic resonance (NMR) data showed that while the yield, especially the MHA/MFA ratio, varied considerably with the concentrations of the reactants, the nitrogen distribution patterns of these polymers were quite *** 65% to 70% of nitrogen in them was in the secondary amide and/or indole form with 24%~25% present as aliphatic and/or aromatic ammes and 5% to 11% as pyrrole and/or pyrrole-like nitrogen. More than half (50%~77%) of the N in these polymers were nonhydrolyzable. The role of Maillard reaction in the formation of nonhydrolyzable nitrogen in soil organic matter is discussed.

关键词： Maillard polymer nitrogen form ^(15)N cross polarisation-magic angle spinning nuclear magnetic resonance (CPMAS NMR)

Effects of different nitrogen forms and concentrations on seedling growth traits and physiological characteristics of Populus simonii × P. nigra

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2022年第5期33卷 1593-1606页

作者： Zhongye Liu Wei Li Zhiru Xu Huihui Zhang Guangyu Sun Heng Zhang Chuanping Yang Guanjun Liu State Key Laboratory of Tree Genetics and Breeding Northeast Forestry UniversityHarbin 150040People’s Republic of China College of Life Science Northeast Forestry UniversityHarbin 150040People’s Republic of China

Numerous growth and physiological variables of 3-week-old Populus simonii × *** seedlings were assessed after treatment with either nitrate nitrogen(NO_(3)^(−)--N)(0.1,0.5,1,5,or 10 mmol·L^(−1)) or ammonium nitrogen(NH_(4)^(+)+-N)(0.1,0.5,1,5,or 10 mmol·L^(−1)) to determine the best nitrogen form and concentration to optimize growth,biomass allocation,pigment content,and photosynthetic *** results of combining membership function and an evaluation index suggested that,5 mmol·L^(−1) nitrogen,regardless of the form,yielded the highest comprehensive evaluation index and good *** addition,a Pearson correlation analysis and network visualization revealed that the total mass,shoot mass,root mass,leaf dry mass,plant height,leaf area,chlorophyll a and total chlorophyll had a physiological index connectivity degree≥15 for both nitrogen *** photosynthetic rate,stomatal conductance,transpiration rate,maximum photochemical efficiency of PSII,total nitrogen content,ground diameter,chlorophyll b,and carotenoid were unique indices for evaluating NH_(4)^(+)+-N-based nutrition,which could provide a theoretical basis for evaluating the effects of nitrogen fertilizer on seedlings,cultivation periods,and stress tolerance in ***× ***.

关键词： nitrogen form nitrogen concentration Growth traits Physiological characteristics

Characteristics of nitrogen forms in the surface sediments of southwestern Nansha Trough,South China Sea

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Oceanology and Limnology 2008年第3期26卷 280-288页

作者：郑国侠宋金明孙云明戴纪翠张蓬 Institute of Oceanology Chinese Academy of SciencesQingdao 266071 China College of Environment and chemical Engineering Dalian universityDalian 116622 China

The area of the southwestern Nansha Trough is one of the most productive areas of the southern South China *** is a typical semi-deep sea area of transition from shoal to abyssal *** understand distributions and roles of nitrogen forms involved in biogeochemical cycling in this area,contents of nitrogen in four extractable forms:nitrogen in ion exchangeable form(IEF-N),nitrogen in weak acid extractable form(WAEF-N),nitrogen in strong alkali extractable form(SAEF-N) and nitrogen in strong oxidation extractable form(SOEF-N),as well as in total nitrogen content(TN) in surface sediments were determined from samples collected from the cruise in April-May *** study area was divided into three regions(A,B and C) in terms of clay sediment(60%,***,region C was the richest in the nitrogen of all forms and region A the poorest,indicating that the finer the grain size is,the richer the contents of various nitrogen *** burial efficiency of total nitrogen in surface sediments was 28.79%,indicating that more than 70% of nitrogen had been released and participated in biogeochemical recycling through sediment-water interface.

关键词： nitrogen form surface sediment Nansha Trough South China Sea

Characteristics of nitrogen forms in the southern Huanghai Sea surface sediments

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 2004年第3期23卷 473-482页

作者： LüXiaoxia SONGJinming LIXuegang YUANHuamao ZHANTianrong LINing GAOXuelu InstituteofOceanology ChineseAcademyofSciencesQingdao266071China GraduateSchoolofChineseAcademyofSciences Beijing100039China

The distributions of different forms of nitrogen in the surface sediments of the southern Huanghai Sea are different and affected by various factors. The contents of IEF-N, SOEF-N and TN gradually decrease eastward, and those of SAEF-N northward, while those of WAEF-N westward. Around the seaport of the old Huanghe (Yellow) River, the contents of both SOEF-N and TN are the highest. Among all the factors, the content of fine sediment is the predominant factor to affect the distributions of different forms of nitrogen. The contents of IEF-N, SOEF-N, and TN have visibly positive correlation with the content of fine sediments, and the correlative coefficient is 0.68, 0.58 and 0.71 respectively, showing that the contents of the three forms of nitrogen increase with those of fine sediments. The content of WAEF-N is related to that of fine sediments to a certain extent, with a correlative coefficient of 0.35; while the content of SAEF-N is not related to that of fine sediments, showing that the content of SAEF-N is not controlled by fine grain-size fractions of sediments. In addition, the distributions of different forms of nitrogen are also interacted one another, and the contents of IEF-N and SOEF-N are obviously affected by TN, while those of inorganic nitrogen (WAEF-N, SAEF-N and IEF-N) are not affected by SOEF-N and TN obviously, although they are interacted each other.

关键词： nitrogen form characteristics controlling factors southern Huanghai Sea surface sediment

Oxalate Accumulation as Regulated by nitrogen forms and Its Relationship to Photosynthesis in Rice （Oryza sativa L.）

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2005年第7期47卷 831-838页

作者： Xiu-MeiJI Xin-XiangPENG LaboratoryofMolecularPlantPhysiology CollegeofLifeSciencesSouthChinaAgriculturalUniversityGuangzhou510642China

: Four-leaf rice seedlings (Oryza sativa L.), which had been cultivated in Kimura B complete nutrient solution, were treated with two nitrogen forms by replacing the nitrogen element in the complete solution with sole nitrate or ammonium (2.86 mmol/L). Nitrate-N nutrition tended to increase oxalate content in all parts of the plant, including the leaves, stems, roots, and root exudates, whereas ammonium had the opposite effect. Consequently, marked differences in oxalate content were observed between the two treatments throughout the time tested (0-12 d), with maximal differences of approximately 12-fold at 6 d after treatment. Photosynthetic/respiratory parameters were examined over time simultaneously with changes in oxalate content. Net photosynthetic rate, chlorophyll fluorescence parameters (i.e. maximal photochemical efficiency (Fv/Fm) and photochemical quantum yields of photosystem (PS)II (φPSII)), and respiratory rate were not significantly different between plants treated with the two nitrogen forms, although ammonium-fed plants had apparently higher leaf chlorophyll content than nitrate-fed plants. Leaf glucose content was altered little, but the content of fructose, sucrose, and total soluble sugar was significantly higher in the leaves of ammonium-fed plants than nitrate-fed plants. The results indicate that nitrate/ammonium may serve as efficient regulators of oxalate accumulation owing to regulation of metabolism in rice leaves rather than oxalate downward transfer and root excretion, and that photosynthetic metabolism is not directly correlated with the regulation of oxalate accumulation in rice plants.

关键词： nitrogen form oxalate accumulation photosynthesis rice