共查询到18条相似文献,搜索用时 156 毫秒
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根系高效铵吸收系统是玉米获取氮素的重要补充机制 总被引:1,自引:0,他引:1
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外源ABA提高甘蓝型油菜抗镉胁迫能力和氮素生理利用效率 总被引:1,自引:0,他引:1
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缺锌对玉米根系发育、生长素含量及生长素转运基因表达的影响 总被引:5,自引:3,他引:2
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低氮胁迫对不同耐低氮玉米品种苗期伤流液性状及根系活力的影响 总被引:5,自引:1,他引:4
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根部增氧模式对水稻产量与氮素利用的影响 总被引:6,自引:0,他引:6
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适量施磷有效提高苋菜对镉污染土壤的修复能力 总被引:1,自引:0,他引:1
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Genotypic differences in arsenic (As) and cadmium (Cd) uptake and their translocation within rice seedlings grown in solution culture were investigated. Arsenic uptake and its translocation differed significantly between eight cultivars. The largest shoot and root As concentrations were found in cultivar ‘TN1’ and ‘ZYQ8’, while cultivar ‘JX-17’ had the lowest As concentration. Arsenic concentration in shoot or root of ‘JX-17’ was about 50% of that in cultivar ‘ZYQ8’. Specific Arsenic uptake (SAU) was found significantly different between rice cultivars, which was about 2-fold higher of ‘ZYQ8’ than that of ‘JX-17’. The Cd accumulation also differed significantly between cultivars. Rice cultivar ‘JX-17’ had the highest ability in Cd uptake, but the lowest ability in Cd translocation from root to shoot. The transfer factor (TF) of Cd had an important effect on Cd accumulation by rice seedlings. Arsenic can competitively inhibit P uptake by rice seedlings, P concentrations in shoots, or roots treated with As were significantly lower than those without As addition. However, the concentrations of P and As were positively correlated within these genotypes. The Cd immobilization by cell wall was an important mechanism for Cd detoxification. The cell wall bound 21–44% of total Cd in shoots and 25–59% of total Cd in roots of these tested genotypes. The genotypic differences in As and Cd uptake and translocation within rice seedlings provide the possibility of selecting and breeding genotypes and /or cultivars with reduced levels of As and Cd in rice grains. 相似文献
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利用实验室水培模拟试验,研究了轻度镉胁迫条件下10个燕麦品种生长及吸收积累镉的差异性。结果表明,经5μmol·L-1的镉处理后,供试燕麦品种的株高、根长、地上部与地下部生物量、叶绿素含量、类胡萝卜素含量均出现不同程度的下降,不同品种间存在明显的差异,有的甚至达到极显著水平;不同品种燕麦对镉的吸收与积累也存在明显差异;燕麦镉的吸收转运与耐性没有直接的联系。按照镉胁迫下燕麦耐镉性和镉含量的冠根比进行聚类分析,可将10个品种分为4类:①镉转运少且耐性强;②转运多但耐性强;③转运多且耐性弱;④转运较少但耐性弱。其中品5号地上部生长抑制率最小,并且镉含量、镉转运量较少,表现出较强的耐镉性,在轻度镉污染土壤上种植品5号有利于降低镉污染对人类健康的风险。 相似文献
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Juan Hirzel Jorge Retamal-Salgado Ingrid Walter Iván Matus 《Archives of Agronomy and Soil Science》2018,64(2):162-172
Durum wheat (Triticum turgidum L. var durum) is a species that accumulates cadmium (Cd). Durum wheat cultivars differ in their absorption ability of Cd; therefore, identifying and selecting genetic material with low Cd accumulation reduces human exposure to this toxic element. In the present study, Cd concentration was evaluated in three Chilean durum wheat cultivars (Llareta-INIA, Corcolén-INIA, and Lleuque-INIA) grown in four Chilean locations with varying concentrations of Cd in soils. The objective of this study was to evaluate the response of these durum wheat cultivars to different doses of cadmium in terms of grain yield; Cd concentration in different plant tissues (grain, straw, roots); soil Cd concentration was also evaluated. Results show that grain yield was not affected by soil Cd; differences in Cd concentration in plant tissues were generally associated with location, cultivar, and soil Cd concentration. Grain Cd concentration in all three cultivars was classified in the low accumulation category for this metal; ‘Lleuque-INIA’ noted as having a very low accumulation. 相似文献
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添加有机酸对土壤镉形态转化及苋菜镉积累的影响 总被引:6,自引:0,他引:6
植物根系分泌的低分子量有机酸能够与土壤中的镉形成镉–有机酸复合体,从而影响根际镉的移动性。本文通过添加有机酸对土壤镉形态转化的研究,阐明有机酸与镉生物积累的关系。采用盆栽试验及土壤培养等方法,研究了添加苹果酸、柠檬酸对赤红壤和黄棕壤中镉的形态转化以及超积累型苋菜天星米镉生物积累的影响。结果表明,与Cd 25 mg/kg处理比较,Cd 25 mg/kg+苹果酸、Cd 25mg/kg+柠檬酸处理对苋菜生物量未产生影响,但显著增加苋菜根系及地上部镉含量;添加苹果酸、柠檬酸处理显著降低土壤专性吸附态Cd含量,却显著增加了交换态Cd、碳酸盐结合态Cd和有机结合态Cd含量。说明添加苹果酸、柠檬酸还能够通过影响土壤镉形态转化而促进苋菜对镉的积累。 相似文献
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The mechanisms of low cadmium (Cd) accumulation in sweet potato cultivars are obscure. In this study, seedlings of a low-Cd (Nan88, N88) and a high-Cd cultivar (Xiang 16, X16) were grown in Hoagland’s solution containing Cd concentrations of 0 (control), 1 (Cd1), and 10 µM (Cd10) for 20 days. We analyzed the Cd accumulation, root morphology and low molecular weight organic acids (LMWOAs) excreted by the root tips (RTs). The total root length (RL) and specific root length (SRL) in X16 were greater than those in N88 following Cd treatments. In the Cd1 treatment, RL and surface area for root diameter was ≤0.2 mm, and RTs in X16 were also greater than those in N88. LMWOAs excreted from the RTs initially increased and then decreased as Cd concentration increased. The RTs of N88 were more efficient at excreting organic acids than were those of X16. The low-Cd cultivar with lower RL and SRL displayed greater ability to excrete organic acids in Cd treatments, which can decrease Cd translocation from roots to shoots. Furthermore, root morphology and some LMWOAs released from the root tips played an important role in the differing rates of Cd accumulation in the two sweet potato cultivars. 相似文献
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Effects of drought on the accumulation and redistribution of cadmium in peanuts at different developmental stages 总被引:1,自引:0,他引:1
This study aimed to investigate the impact of water deficit on cadmium (Cd) accumulation in peanut plants during different developmental stages. Two contrasting peanut cultivars, Fenghua 1 (high-biomass cultivar) and Silihong (low-biomass cultivar), were grown in a Cd-contaminated arable soil under different water regimes. The two cultivars differed from each other in seed Cd concentrations. Fenghua 1 exhibited lower Cd concentrations in the seeds than Silihong, which is associated with root-to-shoot Cd translocation. Drought plays different roles in the translocation and redistribution of Cd in peanut plants during different developmental stages. At the seedling stage, drought decreased shoot Cd concentrations for both cultivars, whereas at the pod-filling and pod-ripened stages, drought increased shoot Cd concentrations. Similarly, drought stress reduced pod Cd concentrations at the pod-filling stages and increased at the pod-ripened stages. Seed Cd concentrations in mature plants were increased by drought for both cultivars. Seed Cd concentrations were negatively correlated with biomasses of shoots and pods, but positively correlated with Cd concentration in the shoots and pods. Increased seed Cd concentrations under drought stress might result from the concentration effects due to drought induced decrease of plant growth. 相似文献
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Imdad Ullah ZAID Sajid Hanif MUHAMMAD Na ZHANG Xin ZHENG Likun WANG Xiaofang LI 《土壤圈》2022,32(4):555-564
Understanding the genetic mechanisms for cadmium (Cd) uptake and translocation in common wheat (Triticum aestivum) is of significance in food Cd contamination control. In this study, a diverse panel of 132 wheat cultivars was collected from the North China Plain. The cultivars were evaluated in terms of their phenotypic variations in response to Cd stress and subjected to a genome-wide association study (GWAS) to identify single nucleotide polymorphisms (SNPs) associated with the phenotypic variations at the seedling stage. Significant phenotypic variations with high heritability were observed among the wheat cultivars exposed to 40 μmol L-1 Cd for the studied traits, including root length (RL), shoot length (SL), root and shoot dry biomasses (RDW and SDW, respectively), root and shoot Cd concentrations (RCD and SCD, respectively), and Cd translocation factor (TF). Mean RCD, SCD, and TF ranged from 1.0 to 33.8, 0.125 to 2.022, and 0.009 to 0.321 mg g-1, respectively. Cluster analysis showed that wheat cultivars with higher RL, SL, RDW, and SDW under Cd stress were able to accumulate more Cd in root, leading to a lower Cd TF. Mixed linear model-based association analysis detected 17 novel significant marker-trait associations (MTAs), four of which were significant at a genome-wide scale. Most of the significant MTAs controlled Cd TF and explained 17.17%-26.47% of the phenotypic variations. Some of the SNP loci were physically close to a reported Cd-related quantitative trait locus or gene on wheat chromosomes. Results of this study provided a list of wheat cultivars with the potential of low Cd accumulation and enriched our knowledge on the genetic basis of Cd uptake and translocation in wheat. Pyramiding breeding of superior alleles detected in this study may additionally reduce Cd accumulation of improved wheat cultivars with excellent agronomic traits. 相似文献
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Muhammad Jaffar Hassan Guoping Zhang Feibo Wu Kang Wei Zhonghua Chen 《植物养料与土壤学杂志》2005,168(2):255-261
A hydroponic experiment with two rice cultivars differing in cadmium (Cd) tolerance was conducted to investigate the alleviating effect of zinc (Zn) on growth inhibition and oxidative stress caused by Cd. Treatments consisted of all combinations of two Zn concentrations (0.2 and 1 μM), three Cd concentrations (0, 1, and 5 μM), and two rice cultivars (Bing 97252, Cd‐tolerant; Xiushui 63, Cd‐sensitive). Cd toxicity caused a dramatic reduction in plant height and biomass, chlorophyll concentration and photosynthetic rate, and an increase in Cd concentration in both roots and shoots, malondialdehyde (MDA) concentration, and superoxide dismutase (SOD) and peroxidase (POD) activities in shoots. The response of all these parameters was much larger for Xiushui 63 than for Bing 97252. Addition of Zn to the medium solution alleviated Cd toxicity, which was reflected in a significant increase in plant height, biomass, chlorophyll concentration, and photosynthetic rate, and a marked decrease in MDA concentration and activity of anti‐oxidative enzymes. However, it was noted that Zn increased shoot Cd concentration at higher Cd supply, probably due to the enhancement of Cd translocation from roots to shoots. Therefore, further studies are necessary to determine the effect of Zn supply on Cd translocation from vegetative organs to grains or grain Cd accumulation before Zn fertilizer is applied to Cd‐contaminated soils to alleviate Cd toxicity in rice. 相似文献