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1.
硝酸盐供应对玉米侧根生长的影响   总被引:21,自引:0,他引:21  
以两个玉米(Zea mays L.)自交系478和Wu312为研究材料,采用琼脂培养方法,研究不同浓度NO-3对侧根生长的影响.结果表明,在外部浓度0.01~1.0mmol/L范围内,NO-3供应能显著增加侧根的长度及根生物量.但当NO-3供应超过1.0 mmo1/L后,侧根长度开始下降.当NO-3供应分别在超过5.0(Wu312)与10(478)mmol/L后,侧根密度显著下降.在10 mmol/LNO-3下,Wu312的侧根生长几乎完全被抑制.而478在20 mmol/L时,侧根密度仍可达到其最大值的30%(主根)~50%(胚根).植株地上部全氮及硝酸盐含量随NO-3供应的增加而升高,二者与侧根长度、侧根密度及冠根比的数学函数关系相同.  相似文献   

2.
采用砂培试验,在2种CO2浓度(自然CO2浓度400μmol·mol-1和高CO2浓度700μmol·mol-1)和2种供氮水平(常氮15 mmol N·L-1和氮胁迫5 mmol N·L-1)下,研究了油菜营养生长阶段的干物质累积和氮素吸收利用的变化。结果表明:高CO2浓度条件下,油菜株高、根茎粗和干物质累积量增加,其中,常氮条件下,根茎粗和地上部干重的增加幅度大于氮胁迫条件,株高和根系干重增加幅度则常氮条件小于氮胁迫条件;高CO2浓度下,根体积、根系活跃吸收面积和总吸收面积在2个供氮水平下均增加,而一级侧根数只在常氮条件下增加,根长只在氮胁迫条件下增加;高CO2浓度条件下,油菜各器官含氮量下降,其中,叶片和根系的含氮素量下降幅度明显大于茎;高CO2浓度条件下,正常供氮时根、茎、叶氮素累积量均增加,氮胁迫时茎氮素累积量增加,而根和叶的氮素累积量减少;高CO2浓度条件下,氮素吸收效率、氮素利用效率和氮效率均增加,常氮条件下增加幅度大于低氮条件,其中,氮素利用效率对氮水平的响应更加明显。  相似文献   

3.
盐胁迫对冬小麦幼苗干物质分配和生理生态特性的影响   总被引:17,自引:2,他引:15  
以冬小麦(Triticum aestivum L.)品种周麦18(Zhoumai18)和豫麦49(Yumai49)为材料,采用盆栽培养,研究100、250、350 mmol/L和450 mmol/L NaCl 浓度胁迫下,小麦幼苗干物质分配、根系特征、叶绿素含量、游离脯氨酸含量和根系活力变化规律.结果表明,随着盐分浓度的增加,两个品种小麦的叶面积、地上干重以及根的长度显著减小;根系干重、根直径、根表面积、根体积、根系活力以及叶绿素含量呈先上升后下降趋势,在250 mmol/L NaCl处理下达最大.叶绿素a/b随NaCl浓度升高而上升.随盐分浓度变化周麦18叶片游离脯氨酸含量高而变化幅度大,450mmol/L处理组的含量高于对照组1.5倍.供试品种冬小麦耐盐阈值为250~350 mmol/L.  相似文献   

4.
氮素对内蒙古典型草原羊草种群的影响   总被引:19,自引:3,他引:19       下载免费PDF全文
 为了研究氮素对内蒙古典型草原植物种群的影响,在中国科学院内蒙古草原生态系统定位研究站,实施了长期的氮素添加试验。就两年来不同梯度氮素处理对羊草(Leymus chinensis)种群的影响进行了分析。结果表明,氮素对羊草种群具有显著的调节效应,随着氮素梯度的增加,羊草种群密度、种群高度、地上生物量、地下生物量、总生物量均显著增加,羊草种群地下生物量/地上生物量比值逐渐降低。氮素对羊草种群构件的生物量分配有显著影响,随着氮素梯度的增加,羊草种群生物量向根茎的分配比例显著降低,向叶片和根系的分配比例显著提高。羊草种群的相对密度和相对生物量也随着氮素梯度的增加而显著提高。  相似文献   

5.
玉米幼苗地下部/根间氮的循环及其基因型差异   总被引:6,自引:0,他引:6  
以两个玉米(Zea mays L.)自交系原引1号(YY1)和综31(Z31)为研究材料,采用盆裁土培的培养方法,在正常供氮(HN,K0.15gN/kg干土)和低氮量供应(ON,0.038gN/kg干土)培养条件下对玉米幼苗植株体内氮的循环量及其他在地上部/根间的分配量进行了定量地测定、计算。结果表明,在玉米幼苗地上部/根间氮的循环量很高。低氮量供应使玉米幼苗植株吸氮量下降,根中氮的分配比例增加,同时地上部/根间氮的循环量也随之减少。与氮低效自交系Z31相比,氮高效自交系YY1幼苗中地上部/根间的氮循环量大、氮向根的分配量高,因而有利于其根系的生长,表现为根/地上部之比和部根长较高。这可能有利于其中后期对氮素的高效吸收与利用。  相似文献   

6.
周钰佩  刘慧霞  于成  林丽果  林选栋 《生态学报》2017,37(16):5514-5521
高羊茅(Festuca arundinacea)因长期多频灌溉往往生长在土壤盐渍化或潜在盐渍化的生境中。采用盆栽试验研究了不同盐生境下添加硅对两个高羊茅品种(抗性强的XD和抗性弱的K31)生物量和渗透调节物质的影响。结果表明:不同盐生境均降低了两个不同抗性高羊茅品种K31和XD的地上生物量和地下生物量。添加硅显著增加了盐浓度小于或等于150 mmol/L时XD的地上和地下生物量,以及盐浓度小于或等于100 mmol/L时K31地下生物量,但对K31地上生物量没有显著影响。添加硅显著增加了盐浓度小于或等于150 mmol/L时XD的地下地上生物量比,以及盐浓度100 mmol/L时K31地上地下生物量比。盐生境降低了XD和K31可溶性糖、可溶性蛋白、脯氨酸和丙二醛含量。添加硅没有显著影响XD的渗透调节物质含量,但显著降低了盐浓度大于或等于200 mmol/L时K31的可溶性糖含量,以及盐浓度250 mmol/L时K31的脯氨酸含量。添加硅均显著降低盐浓度大于或等于150 mmol/L时K31和XD的丙二醛含量,但XD的降低幅度大于K31。结果表明,添加硅对盐生境下高羊茅生长有一定的促进作用,但这种促进作用与品种自身抗性密切相关。  相似文献   

7.
菜豆根形态特性的基因型差异与磷效率   总被引:5,自引:0,他引:5  
廖红  严小龙 《Acta Botanica Sinica》2001,43(11):1161-1166
应用磷控释砂培以及计算机图象分析技术,研究了磷效率差异显的菜豆(Phaseolus vulgaris L.)亲本及其重组自交系后代的根形态特性及其与磷效率的关系。试验结果表明,供磷状况显影响菜豆根系形态学特性。在低磷胁迫下,菜豆根系总根长变短、根部生物量减少,根直径增大。菜豆根形态特性对低磷有效性的适应性反应具有显的基因型差异。在低磷条件下磷高效率基因型的根系比磷低效率基因型相对根部生物量较大、总根长较长,根表面积较大。异计分析表明,菜豆基根根形态特性在低磷条件下的适应性变化对磷效率的贡献远远大于主根,并且这些适应性变化是可以遗传的,表明通过对菜豆根形态特性进行遗传改良来提高磷效率有一定的可行性。  相似文献   

8.
麦棉套作复合根系群体对棉株氮素吸收与分配的影响   总被引:2,自引:1,他引:1  
在盆栽麦棉套作条件下,于2003~2004年设置麦棉自然根系(麦棉根系和肥水均可相互通过)、麦棉纱网隔根(肥水可相互通过,麦棉根系不能相互通过)和麦棉塑膜隔根(麦棉根系和肥水均不能相互通过)3种麦棉根系处理,运用小麦叶片15N富积标记法和15N同位素稀释法,研究麦棉复合根系群体对棉花氮素吸收与分配的影响.结果表明,在麦棉套作群体中,既存在麦棉共处期小麦对棉花根区氮素的竞争,又存在小麦根区及其所吸收氮素向棉花的转移.棉花根系吸收的15N肥料大多分配到地上部,根系分配的量较少,且麦棉自然根系处理地上部的15N标记肥料氮的吸收率(NUR)最大,纱网隔根处理次之,塑膜隔根处理最少.在麦棉共处期,麦棉自然根系处理棉花的植株从15N标记肥料中吸收的氮占其全氮的百分率(Ndff)和NUR均低于隔根处理.至棉花初花期(小麦已收获,秸秆原位埋入土壤中),麦棉自然根系处理棉花吸收的氮素主要来源于化学肥料而非秸秆降解物.棉株不同器官所分配的15N标记肥料比例不同,棉花生殖器官中15N含量明显高于其他器官.麦棉自然根系处理棉株生物量也高于隔根处理.  相似文献   

9.
Spd浸种对盐胁迫下番茄(Solanum lycopersicum)幼苗的保护效应   总被引:3,自引:0,他引:3  
胡晓辉  杜灵娟  邹志荣 《生态学报》2009,29(9):5152-5157
通过水培试验,研究了100 mmol/L NaCl盐浓度下,0.25 mmol/L Spd浸种处理对两个番茄品种白果强丰(耐盐基因型)和江蔬14号(盐敏感基因型)植株干重、根冠比(R/T)、幼苗叶片和根系抗氧化酶活性及活性氧含量的影响.具体试验处理如下:(a) 对照(蒸馏水浸种+ 0 mmol/L NaCl),(b) NaCl (蒸馏水浸种+ 100 mmol/L NaCl),(c) Spd(0.25 mmol/L Spd浸种 +100 mmol/L NaCl).结果表明,在盐胁迫下,两个番茄品种幼苗叶片和根系内超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性升高,H2O2含量和O·-2产生速率增高,幼苗生长受到抑制,幼苗地上部、地下部干重均明显低于对照,R/T增大,且江蔬14号的变化幅度大于白果强丰.Spd浸种处理降低了盐胁迫下番茄幼苗叶片和根系内O·-2产生速率和H2O2含量,进一步提高了SOD、POD和CAT活性,促进幼苗干重增加,缓解了盐胁迫对植株的伤害.与耐盐基因型番茄品种白果强丰相比,Spd浸种处理对盐敏感基因型番茄品种江蔬14号的作用效果更为明显.总之,Spd浸种处理通过提高盐胁迫下植株体内抗氧化酶活性,降低ROS水平来缓解盐胁迫对番茄幼苗的伤害,提高幼苗耐盐能力.  相似文献   

10.
我国南方土壤缺P严重,加之近年来大气N沉降增加明显,导致森林土壤有效N含量增加和N/P发生改变,从而对林木的生长发育和生产力产生影响。本文选择马尾松、杉木和木荷等3种南方具有不同生长和生物学特性的主要针阔叶造林树种,设置低P胁迫下的模拟N沉降盆栽试验,研究N素增加下3种苗木生长发育及适应低P胁迫机制的种间差异。结果表明:1)模拟N沉降增加了马尾松和木荷生物量向地上部分的分配,增加了地上部分的生长量和生物量,但根系的生物量降低,2种幼苗的整株生物量变化均不显著。N素的增加严重抑制了杉木幼苗地上部分和根系的生长,整株生物量显著降低;2)模拟N沉降加剧了3种幼苗遭受低P胁迫的程度,其根系分泌性酸性磷酸酶(APase)活性及有机酸总量均增加。马尾松和木荷较杉木根系分泌物总量增加幅度大;3)模拟N沉降增加了3种幼苗叶N含量,降低了叶P含量,增加了叶N/P。杉木叶N/P增加幅度最大,马尾松叶最小。杉木叶N/P急剧增加,导致其叶P含量的相对匮缺,叶N、P素营养失衡,最终影响杉木叶光合作用。马尾松和木荷叶片N/P增加幅度较小,N素的增加促进了2种幼苗净光合速率的提高;4)N沉降下,马尾松、木荷表层土壤酸化程度较杉木大。杉木和马尾松土壤水解N含量增加幅度较木荷更大,这归因于木荷对土壤表层N的吸收和淋溶作用均较大,马尾松表层土壤N的淋溶作用较杉木强。3树种盆栽土壤有效P含量均降低,而表层土壤有效P含量均较底层高。  相似文献   

11.
Possible Involvement of Cytokinin in Nitrate-mediated Root Growth in Maize   总被引:1,自引:1,他引:0  
Response of root system architecture to nutrient availability in soils is an essential way for plants to adapt to soil environments. Nitrate can affect root development either as a result of changes in the external concentration, or through changes in the internal nutrient status of the plant. Nevertheless, less is known about the physiological mechanisms. In the present study, two maize (Zea mays L.) inbred lines (478 and Wu312) were used to study a possible role of cytokinin in nitrate-mediated root growth in nutrient solutions. Root elongation of 478 was more sensitive to high nitrate supply than that of Wu312. Medium high nitrate (5 mM) inhibited root elongation in 478, while, root elongation in Wu312 was only inhibited at high NO 3 supply (20 mM). Under high nitrate supply, the root elongation zone in 478 became swollen and the site of lateral root elongation was close towards the root tip. Both of the phenomena are typical of root growth induced by exogenous cytokinin treatments. Correspondingly, zeatin and zeatin nucleotide (Z + ZR) concentrations were increased at higher nitrate supply in 478, whereas they were constant in Wu312. Furthermore, exogenous cytokinin 6-benzylaminopurine (6-BA) completely reversed the stimulatory effect of low nitrate on root elongation. Therefore, it is supposed that the inhibitory effect of high concentration of nitrate on root elongation is, at least in part, mediated by increased cytokinin level in roots. High nitrate supply may have negative influences on root apex activity by affecting cytokinin metabolism so that root apical dominance is weakened and, therefore, root elongation is suppressed and lateral roots grow closer to the root apex. Nitrate suppressed lateral root elongation in Wu312 at concentration higher than 5 mM. In 478, however, this phenomenon was not significant even at 20 mM nitrate. Although exogenous 6-BA (20 nM) could suppress lateral root elongation as well, the inhibitory effect of high NO 3 concentration of nitrate on lateral root growth cannot be explained by changes in endogenous cytokinin alone.  相似文献   

12.
BACKGROUND AND AIMS: Plant shoots form a sink for NH3, and are able to utilize it as a source of N. NH3 was used as a tool to investigate the interaction between foliar N uptake and root N uptake. To what extent NH3 can contribute to the N budget of the plant or can be regarded as a toxin, was investigated in relation to its concentration and the N supply in the root environment. METHODS: Brassica oleracea was exposed to 0, 4 and 8 microL L(-1) NH3, with and without nitrate in the nutrient solution. Growth, N compounds, nitrate uptake rate, soluble sugars and cations were measured. KEY RESULTS: In nitrate-sufficient plants, biomass production was not affected at 4 microL L(-1) NH3, but was reduced at 8 microL L(-1) NH3. In nitrate-deprived plants, shoot biomass was increased at both concentrations, but root biomass decreased at 8 microL L(-1) NH3. The measured nitrate uptake rates agreed well with the plant's N requirement for growth. In nitrate-sufficient plants nitrate uptake at 4 and 8 microL L(-1) NH3 was reduced by 50 and 66 %, respectively. CONCLUSIONS: The present data do not support the hypothesis that NH3 toxicity is caused by a shortage of sugars or a lack of capacity to detoxify NH3. It is unlikely that amino acids, translocated from the shoot to root, are the signal metabolites involved in the down-regulation of nitrate uptake, since no relationship was found between changes in nitrate uptake and root soluble N content of NH3-exposed plants.  相似文献   

13.
Barley (Hordeum vulgare L. cv. Golf) was cultured using the relative addition rate technique, where nitrogen is added in a fixed relation to the nitrogen already bound in biomass. The relative rate of total nitrogen addition was 0.09 day?1 (growth limiting by 35%), while the nitrate addition was varied by means of different nitrate: ammonium ratios. In 3- to 4-week-old plants, these ratios of nitrate to ammonium supported nitrate fluxes ranging from 0 to 22 μmol g?1 root dry weight h?1, whereas the total N flux was 21.8 ± 0.25 μmol g?1 root dry weight h?1 for all treatments. The external nitrate concentrations varied between 0.18 and 1.5 μM. The relative growth rate, root to total biomass dry weight ratios, as well as Kjeldahl nitrogen in roots and shoots were unaffected by the nitrate:ammonium ratio. Tissue nitrate concentration in roots were comparable in all treatments. Shoot nitrate concentration increased with increasing nitrate supply, indicating increased translocation of nitrate to the shoot. The apparent Vmax for net nitrate uptake increased with increased nitrate fluxes. Uptake activity was recorded also after growth at zero nitrate addition. This activity may have been induced by the small, but detectable, nitrate concentration in the medium under these conditions. In contrast, nitrate reductase (NR) activity in roots was unaffected by different nitrate fluxes, whereas NR activity in the shoot increased with increased nitrate supply. NR-mRNA was detected in roots from all cultures and showed no significant response to the nitrate flux, corroborating the data for NR activity. The data show that an extremely low amount of nitrate is required to elicit expression of NR and uptake activity. However, the uptake system and root NR respond differentially to increased nitrate flux at constant total N nutrition. It appears that root NR expression under these conditions is additionally controlled by factors related to the total N flux or the internal N status of the root and/or plant. The method used in this study may facilitate separation of nitrate-specific responses from the nutritional effect of nitrate.  相似文献   

14.
A simple three equation model is proposed for the feedback regulation of nitrate uptake and N2 fixation, based on the concentration of the organic N substrate pool within the plant and two parameters denoting the N substrate concentrations at which half-maximal inhibition occurs. This model simulated three contrasting phenotypes of white clover (Trifolium repens L.) inbred lines with (1) normal rates of nitrate uptake and N2 fixation (NNU); (2) low rates of nitrate uptake (LNU); and (3) very low rates of N2 fixation (VLF). The LNU phenotype was simulated by a decrease in the value of the inhibition parameter for nitrate uptake and the VLF phenotype was simulated by a decrease in the value of the N2 fixation inhibition parameter. The model was tested against nitrate uptake data obtained from white clover plants growing in flowing nutrient culture. There was an accurate prediction of the increase in nitrate uptake caused by N2 fixation activity of the NNU and LNU inbred lines being interrupted by a switch in gas phase from air to Ar : O2. The model was also tested against data for nitrate uptake, N2 fixation and %N from fixation for the three inbred clover lines grown in flowing nutrient culture at 0, 5 or 20 mmol m(-3) N(3-). Again there was accurate prediction of nitrate uptake, although simulated values for N2 fixation were more variable. The simple model has potential use as a sub-routine in larger models of legume growth under field conditions.  相似文献   

15.
Six Argentinian wheat ( Triticum aestivum L.) cultivars grown in nutrient solutions in controlled environment were compared for their nitrate uptake rates on a root dry weight basis. Up to 3-fold differences were observed among the cultivars at 16, 20 and 24 days from germination, either when measured by depletion from the nutrient solution in short-term experiments, or by total N accumulation in the tissue during 8 days.
No differences in total N concentration in root or shoots were found among cultivars. Although the different cultivars showed significant differences in shoot/root ratio and nitrate reductase activity (EC 1.6.6.1) in the roots, none of these parameters was correlated with the nitrate uptake rate. However, nitrate uptake was found to be positively correlated (r = 0.99) with the shoot relative growth rate of the cultivars. The three cultivars with the highest nitrate uptake rates and relative growth rates showed a positive correlation between root nitrate concentration and uptake. However, this correlation was not found in the cultivars with the lowest growth and uptake rates.
Our results indicate that the difference in nitrate uptake rate among these cultivars may only be a consequence of their differences in growth rate, and it is suggested that at least two mechanisms regulate nitrate uptake, one working when plant demand is low and another when plant demand is high.  相似文献   

16.
Leaf temperature has been shown to vary when plants are subjected to water stress conditions. Recent advances in infrared thermography have increased the probability of recording drought tolerant responses more accurately. The aims of this study were to identify the effects of drought on leaf temperature using infrared thermography. Furthermore, the genomic regions responsible for the expression of leaf temperature variation in maize seedlings (Zea mays L.) were explored. The maize inbred lines Zong3 and 87-1 were evaluated using infrared thermography and exhibited notable differences in leaf temperature response to water stress. Correlation analysis indicated that leaf temperature response to water stress played an integral role in maize biomass accumulation. Additionally, a mapping population of 187 recombinant inbred lines (RILs) derived from a cross between Zong3 and 87-1 was constructed to identify quantitative trait loci (QTL) responsible for physiological traits associated with seedling water stress. Leaf temperature differences (LTD) and the drought tolerance index (DTI) of shoot fresh weight (SFW) and shoot dry weight (SDW) were the traits evaluated for QTL analysis in maize seedlings. A total of nine QTL were detected by composite interval mapping (CIM) for the three traits (LTD, RSFW and RSDW). Two co-locations responsible for both RSFW and RSDW were detected on chromosomes 1 and 2, respectively, which showed common signs with their trait correlations. Another co-location was detected on chromosome 9 between LTD and shoot biomass, which provided genetic evidence that leaf temperature affects biomass accumulation. Additionally, the utility of a thermography system for drought tolerance breeding in maize was discussed.  相似文献   

17.
玉米幼苗地上部/根间氮的循环及其基因型差异   总被引:8,自引:0,他引:8  
以两个玉米(ZeamaysL.)自交系原引1号(YY1)和综31(Z31)为研究材料,采用盆栽土培的培养方法,在正常供氮(HN,0.15gN/kg干土)和低氮量供应(LN,0.038gN/kg干土)培养条件下对玉米幼苗植株体内氮的循环量及其在地上部/根间的分配量进行了定量地测定、计算。结果表明,在玉米幼苗地上部/根间氮的循环量很高。低氮量供应使玉米幼苗植株吸氮量下降,根中氮的分配比例增加,同时地上部/根间氮的循环量也随之减少。与氮低效自交系Z31相比,氮高效自交系YY1幼苗中地上部/根间的氮循环量大、氮向根的分配量高,因而有利于其根系的生长,表现为根/地上部之比和总根长较高。这可能有利于其中后期对氮素的高效吸收与利用。  相似文献   

18.
The effect of salinity on nitrate influx, efflux, nitrate net uptake rate and net nitrogen translocation to the shoot was assessed in a 15N steady state labelling experiment in the halophyte Plantago maritima L. raised for 14 days on solution supplied with 50, 100 and 200 mol m–3 sodium chloride or without sodium chloride. Additionally, salinity induced changes in root morphology were determined. Specific root length increased upon exposure to elevated sodium chloride concentrations due to variations in biomass allocation and length growth of the tap root. Changes in root morphology, however, had a minor effect on nitrate fluxes when expressed on a root fresh weight basis. The decreased rate of nitrate net uptake in plants grown on elevated levels of sodium chloride was almost entirely due to a decrease in nitrate influx. Expressed as a proportion of influx, nitrate efflux remained unchanged and was even lower at the highest salinity level. At all sodium chloride concentrations applied the initial rate of nitrogen net translocation to the shoot decreased relative to the rate of nitrate net uptake. It is concluded that under steady state conditions the negative effect of sodium chloride on the rate of nitrate net uptake at non growth-limiting salinity levels was due to the interaction between sodium chloride and nitrate transporters in the root plasma membrane and/or processes mediating the translocation of nitrogen compounds, possibly nitrate, to the shoot.  相似文献   

19.
Uptake and distribution of cadmium in maize inbred lines   总被引:39,自引:0,他引:39  
Genotypic variation in uptake and distribution of cadmium (Cd) was studied in 19 inbred lines of maize (Zea mays L.). The inbred lines were grown for 27 days on an in situ Cd-contaminated sandy soil or for 20 days on nutrient solution culture with 10 µg Cd L-1. The Cd concentrations in the shoots showed large genotypic variation, ranging from 0.9 to 9.9 µg g-1 dry wt. for the Cd-contaminated soil and from 2.5 to 56.9 µg g-1 dry wt. for the nutrient solution culture. The inbred lines showed a similar ranking for the Cd concentrations in the shoots for both growth media (r2=0.89). Two main groups of inbreds were distinguished: a group with low shoot, but high root Cd concentrations (shoot: 7.4±5.3 µg g-1 dry wt.; root: 206.0±71.2 µg g-1 dry wt.; shoot Cd excluder) and a group with similar shoot and root Cd concentrations (shoot: 54.2±3.4 µg g-1 dry wt.; root: 75.6±11.2 µg g-1 dry wt.; non-shoot Cd excluder). The classification of the maize inbred lines and the near equal whole-plant Cd uptake between the two groups demonstrates that internal distribution rather than uptake is causing the genotypic differences in shoot Cd concentration of maize inbred lines. Zinc (Zn), a micronutrient chemically related to Cd, showed an almost similar distribution pattern for all maize inbred lines. The discrepancy in the internal distribution between Cd and Zn emphasizes the specificity of the Cd distribution in maize inbred lines.  相似文献   

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