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1.
Cadmium (Cd) is absorbed by rice root and transferred into the other rice organs including grain. A solution-culture experiment was conducted to investigate the absorption and distribution of Cd supplied at different growth stages of rice. Two rice cultivars, a japonica ‘Chucheong’ and a tongil-type ‘Milyang23’ that exhibit high and low ability of Cd absorption by root and accumulation in grain were grown in culture solution and subjected to 2 ppm CdCl2 treatment for 2 weeks at four different growth stages: before panicle initiation stage (BPI), after panicle initiation stage (API), early ripening stage (ER), and mid-ripening stage (MR). Cd concentration and accumulation in rice organs were measured at harvest. The two rice cultivars accumulated two to three times greater amounts of Cd in grain in the two Cd treatments before heading (BPI and API treatments) than in the Cd treatment after heading (ER and MR treatment). The higher grain Cd accumulation in BPI and API treatments was not attributed to the higher Cd uptake but to the higher translocation from root to shoot and the higher redistribution from shoot to grain than ER and MR treatments These results imply that the remobilization of Cd through phloem during leaf senescence is the major process for Cd accumulation in rice grain rather than direct transport of absorbed Cd through the xylem-phloem transfer to grain. ‘Milyang23’ absorbed significantly smaller amount of Cd than ‘Chucheong’. However, ‘Milyang23’ accumulated more than a three times larger amount of Cd in grain compared to ‘Chucheong’ as the former exhibited the higher root-shoot translocation and shoot-grain remobilization as well. It indicates that the greater Cd translocation from root to shoot and subsequent higher Cd remobilization from shoot to grain, not the higher absorption ability, have led to the higher Cd accumulation and concentration in grain of ‘Milyang23’.  相似文献   

2.
We previously surveyed chromosomal regions showing segregation distortion of RFLP markers in the F2 population from the cross between a japonica type variety ‘Nipponbare’ and an indica type variety ‘Milyang23’, and showed that the most skewed segregation appeared on the short arm of chromosome 3. By comparison with the marker loci where distortion factors were previously identified, this region was assumed to be a gametophytic selection-2 (ga2) gene region. To evaluate this region, two near isogenic lines (NILs) were developed. One NIL had the ‘Nipponbare’ segment of this region on the genetic background of ‘Milyang23’ (NIL9-23), and the other NIL had the ‘Milyang23’ segment on the genetic background of ‘Nipponbare’ (NIL33-18). NIL9-23 and ‘Milyang23’, NIL33-18 and ‘Nipponbare’, and ‘Nipponbare’ and ‘Milyang23’ were respectively crossed to produce F1 and F2 populations. The F1 plants of NIL9-23 × ‘Milyang23’ and NIL33-18 × ‘Nipponbare’ showed high seed fertility and the same pollen fertility as their parental cultivars, indicating that ga2 does not reduce seed and pollen fertility. Segregation ratio of a molecular marker on the ga2 region in the three F2 populations was investigated to clarify whether segregation distortion occurred on the different genetic backgrounds. Segregation distortion of the ga2 region appeared in the both F2 populations from the NIL9-23 and ‘Milyang23’ cross (background was ‘Milyang23’ homozygote) and the ‘Nipponbare’ and ‘Milyang23’ cross (background was heterozygote), but did notin the F2 population from the NIL33-18 and ‘Nipponbare’ cross (background was ‘Nipponbare’ homozygote). This result indicates that ga2 interacts with a ‘Milyang23’ allele(s) on the different chromosomal region(s) to cause skewed segregation of the ga2 region. In addition, segregation ratio was the same between the F2 populations from NIL9-23 × ‘Milyang23’ and ‘Nipponbare’ × ‘Milyang23’ crosses, suggesting that the both genotypes, ‘Milyang23’ homozygote and heterozygote, of gene(s) located on the different chromosomal region(s) have the same effect on the segregation distortion. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

3.
Functional stay-green has been regarded as a promising characteristic to be introduced for improving rice yield potential. A functional stay-green rice “SNU-SG1” that was identified from japonica rice collections was compared with two regular high-yielding rice cultivars (HYVs) for the temporal change of leaf chlorophyll, soluble protein, and root activity, and nitrogen accumulation and remobilization during the grain-filling period. SNU-SG1 had slower decreasing rate and maintained higher concentration of chlorophyll and soluble protein in upper four leaves during the grain-filling period than HYVs “Suweon490” and “Andabyeo”, revealing a typical stay-green characteristic. Even though SNU-SG1 remobilized almost the same proportion of N accumulated before heading as HYVs to grain, it maintained much higher leaf N concentration due to the significantly higher N accumulation that is ascribable to the higher root activity sustenance during grain-filling period. The functional stay-green trait of SNU-SG1 seems to stem not only from the genetic control preventing chlorophyll degradation but also from the higher capacity to absorb N from soil due to the sustained strong root activity during grain-filling period. SNU-SG1 exhibited higher crop growth rate during late grain-filling period than HYVs, resulting in higher grain-filling percentage and non-structural carbohydrate re-accumulation in the stem at the final stage of grain filling. It is concluded that SNU-SG1 has a promising trait “functional stay-green” contributable to rice yield potential improvement through the improved grain filling.  相似文献   

4.
中粳稻不同栽培模式对产量及其生理特性的影响   总被引：11，自引：3，他引：8  
旨在探讨水稻高产与氮肥高效利用的栽培技术。以中粳稻品种,设置当地高产栽培(对照)、超高产栽培和高产高效栽培等处理,比较分析在不同栽培技术体系下产量形成特点及其生理原因。与对照相比,高产高效栽培增加了根和地上部植株干重、提高了根系细胞分裂素含量、根系氧化力、粒叶比、灌浆中后期叶片光合速率、抽穗期茎鞘中非结构性碳水化合物累积量、物质运转率和收获指数;产量增加了31%,氮肥农学利用率(单位施氮量增加的产量)增加了57%。说明通过栽培技术的集成优化,可以促进植株生长,进而获得高产和氮肥高效利用的效果。  相似文献   

5.
通过比较种植模式双季稻（RR）,春玉米―晚稻（MR）,早稻―秋玉米（RM）的生育期、产量、经济效益及农产品镉含量等,探讨湖南镉污染稻田玉米对水稻季节性替代种植的可行性。结果表明,从生育季节来看,3种模式的晚季作物均能在10月下旬成熟,均适合在湖南双季稻区应用。2015和2016年两季作物总产量分别以RR和MR模式较高,但差异均不显著。与RR模式相比,2015年MR和RM模式下的纯收入有所下降,但2016年明显提高,2年总收入表现为MR>RM>RR,且前2种模式的单个劳动力纯收入明显高于RR模式。RM与MR模式的水稻糙米镉含量较RR模式有降低趋势,2016年晚稻表现更明显,从0.823mg/kg降到了0.621mg/kg。水稻糙米镉含量在0.231~0.823mg/kg,玉米籽粒镉含量在0.036~0.081mg/kg。水稻镉积累量远高于玉米,晚稻镉积累量远高于早稻,3种模式2季作物地上部总镉积累量表现为RR>MR>RM,且差异显著。可见,从生育季节、产量、纯收入和籽粒镉含量等角度考虑,春玉米―晚稻与早稻―秋玉米种植模式替代双季稻模式是可行的,考虑到春玉米―晚稻种植模式地上部镉移除量较多,因此宜首选春玉米―晚稻模式。  相似文献   

6.
Eighty-eight aromatic cultivars collected from Maharashtra state were assessed for determinants of kernel quality (kernel size-shape, test weight and aroma) and grain morphology such as awning, lemma and palea characters, pubescence, colour of sterile lemma and apiculus colour. We, report seven cultivars—‘Girga’, ‘Kothmirsal’, ‘Kala bhat’, ‘Chimansal’, ‘Jiri’, ‘Kalsal’ ‘Velchi’ and ‘Kali kumud’ as indigenous to southern India. Of the 69 cultivars characterized for agronomic traits 36 cultivars were exquisite genotypes and possessed one or more superior traits such as early flowering, dwarf stature, higher number of productive tiller per plant; long panicles; higher number of filled grains per panicle and strong aroma. Variability in aromatic cultivars was assessed on the basis of nine traits placed aromatic rice cultivars in five clusters. Number of cultivars in each cluster ranged from 1 to 33. 27 significant correlations were obtained in the physical, agronomic and grain morphology traits. Aroma was found to be negatively associated with days to 50% flowering as well as with filled grains per panicle. However, correlation between panicle length and effective tillers with aroma was not observed. Therefore, to increase the yield, improvement in length of panicle and increasing number of productive tillers in medium or mild scented cultivars would be the best strategy.  相似文献   

7.
Diallel analysis has revealed that anther culturability in rice (Oryza sativa L.) is a quantitative trait controlled by the nuclear genome. Mapping of anther culturability is important to increase the efficiency for green plant regeneration from microspores. In the previous study, we detected distorted segregation of RFLP markers in rice populations derived from the anther culture of an F1 hybrid between a japonica cultivar ‘Nipponbare’ and an indica cultivar ‘Milyang 23’. To clarify the association between chromosomal regions showing distorted segregation and anther culturability, the anther culturability of doubled haploid lines derived from the same cross combination was examined, and the association between alleles of the RFLP markers, which exhibiting the most distorted segregation on chromosomes 1, 3, 7, 10 and 11, and the anther culturability was evaluated. One region on chromosome 1 was found to control callus formation from microspores, and one region on chromosome 10 appeared to control the ratio of green to albino regenerated plants. In both regions, the Nipponbare allele had positive effects. Three regions on chromosomes 3, 7 and 11, however, showed no significant effect on anther culturability. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

8.
This experiment was conducted to investigate the characteristics of lead (Pb) accumulation and distribution among rice organs in 35 rice cultivars of different genotypes. The 35 rice cultivars of four cultivar groups (temperate japonica, tropical japonica, tongil-type, and Indica) were grown with irrigation water containing 10 ppm throughout all growing seasons at the experimental farm of Seoul National University, Korea. Rice plants were sampled and analyzed for Pb accumulation and distribution in each rice organ at harvest. The results showed that Pb concentration, accumulation, and distribution in rice organs except roots were significantly different among 35 rice cultivars. Pb levels in different rice organs followed the order: root > shoot > grain. Grain Pb concentration and accumulation ranged from 0.05 to 0.22 mg kg-1 and from 0.016 to 0.127 mg m-2, respectively. The lowest and highest grain Pb concentration and accumulation were observed in a temperate japonica cultivar ‘Hwajin’ and a tropical japonica cultivar ‘IR71204’, respectively. Grain Pb concentration showed highly significant correlations with the shoot-grain redistribution ratio among 35 cultivars. However, it was not correlated with shoot Pb concentration and accumulation, root Pb concentration, and the root-shoot translocation factor. Significant differences in Pb concentration, accumulation, and distribution in rice organs among four cultivar groups were only found in shoot Pb accumulation. Indica showed the highest Pb accumulation in shoots, while temperate japonica was the lowest. Grain Pb concentration for four cultivar groups was found to be significantly correlated with the shoot-grain redistribution ratio in common.  相似文献   

9.
Plant breeding for drought-prone habitats envisages a favorable combination of grain yield and drought resistance. Though several components enhancing drought resistance have been identified in rice,their association with grain yield, under low-moisture stress, has been established in very few instances. We attempt to study the associations between rice grain yield and root system parameters both at phenotypic and genotypic levels. The doubled haploid population of IR64/Azucena was evaluated for root related traits at peak vegetative stage and grain yield related traits under both low-moisture stress and non stress conditions. ‘Mean environment’ was computed for yield related traits. Correlation and QTL mapping was attempted to find out the associations. The correlation between maximum root length and grain yield was positive under stress and negative in non stress. Genotypes with thicker and deeper roots, manifested higher biomass and grain yield under stress. Only one QTL found to increase days to flowering in non stress was also found to influence root volume and dry weight negatively under stress. The study suggests that loci enhancing grain yield and related traits were not pleiotropic with loci for desirable root morphological traits studied under low-moisture stress at vegetative stage, in the genetic material used in the study. It is thus possible to combine higher grain yield and desirable root morphological traits, favorably, to enhance productivity of rice under low-moisture stress. In rainfed ecologies, where deep roots contribute to enhanced drought resistance in rice, the results indicate the possibility of combining drought resistance with higher levels of grain yield. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

10.
有机水溶肥对水稻干物质、氮素积累和转运的影响   总被引：1，自引：0，他引：1  
采用大田小区试验,研究了有机水溶肥对水稻各器官干物质和氮素积累、转运和分配的影响及其与水稻产量的关系。结果表明,常规施氮条件下,根施肥能显著提高水稻产量,产量达8 288.3kg/hm 2,且根施肥效果优于叶面肥;减氮15%条件下根施肥和叶面肥配合施用能有效缓解减氮对水稻产量的降低作用,较减氮15%处理显著增产3.2%。根施肥和叶面肥均能显著提高水稻抽穗前营养器官干物质、茎鞘和叶片氮素积累量;同时,增加抽穗后叶片向穗的氮转运量,进而提高其氮回收利用率和氮生理利用率。水稻产量与抽穗期茎鞘、叶片（除分蘖期茎鞘外）干物质积累量以及抽穗后茎鞘和叶氮素转运量显著正相关。研究表明,施用有机水溶肥能维持水稻营养生长期较高的干物质和氮素积累量,增强抽穗-成熟期氮素向穗转运能力,促进水稻高产和氮高效利用。  相似文献   

11.
Cadmium (Cd) is a non-essential element and toxic to plants. To investigate the genetics of Cd tolerance and accumulation in rice, quantitative trait loci (QTL) associated with Cd tolerance and accumulation at the seedling stage were mapped using a doubled haploid (DH) population derived from a cross between a japonica JX17 and an indica ZYQ8. A total of 22 QTLs were found to be associated with shoot height (SH), root length (RL), shoot dry weight (SDW), root dry weight (RDW), total dry weight (TDW) and chlorophyll content (CC), and 10 and 12 QTLs were identified under the control and Cd stress conditions, respectively. For Cd tolerant coefficient (CTC), 6 QTLs were detected on chromosomes 1, 3, 5, 8 and 10. Under Cd stress, 3 QTLs controlling root and shoot Cd concentrations were mapped on chromosome 6 and 7. One QTL for shoot/root rate of Cd concentration was identified on chromosome 3. The results indicated that Cd tolerance and accumulation were quantitatively inherited, and the detected QTLs may be useful for marker-assistant selection (MAS) and identification of the genes controlling Cd tolerance and accumulation in rice.  相似文献   

12.
Hybridization between Clearfield rice and weedy red rice would have a direct impact on management and long-term strategies of imazethapyr technology for rice weed control. The objective of this research was to determine rates and agronomic consequences for outcrossing between Clearfield rice and red rice. Red rice populations showed extensive variation for plant height, panicle length, tillers/plant, seeds/plant, seed set and grain weight. Outcrossing was detected from all Clearfield rice cultivars (‘CL121’, ‘CL141’, ‘CL161’, and ‘CLXL8’) to red rice and was confirmed by phenotypic and DNA marker analyses. An overall outcrossing frequency of 0.17% was observed in 2002 red rice samples with a range from 0% to 0.46%. Tolerance of 2002 red rice samples to imazethapyr corresponded to levels of acetohydroxyacid synthase (AHAS) activity. A majority (94%) of the progeny from the 2002 samples segregated 3 resistant:1 susceptible for tolerance to imazethapyr, indicating that a single dominant gene from Clearfield rice was associated with tolerance in the hybrid material. The remaining samples did not segregate for tolerance, suggesting that spontaneous mutations for tolerance were present in this material before or after crossing with Clearfield rice. A four-fold increase in outcrossing frequency of 0.68% was observed in 2003 red rice samples with the highest outcrossing frequency for a single location at 3.2%. Results from this study indicate that outcrossing between Clearfield and red rice will occur rapidly at rates that warrant early-season field scouting and a crop rotation scheme to prolong usefulness of the Clearfield technology.  相似文献   

13.
Fusarium head blight (FHB) caused by Fusarium graminearum is one of the most destructive fungal diseases. Wide spread of FHB causes yield loss, quality reduction, and accumulation of poisonous mycotoxins. Twenty-three Korean wheat cultivars and a known FHB resistant cultivar ‘Sumai 3’ were tested for Type I and Type II resistance to FHB and evaluated for grain characteristics. Wheat cultivars showed infection scores of 0.6 (the lowest) to 7.8 (the highest) in response to the Fusarium inoculation for Type I evaluation. Three Korean cultivars, ‘Chungkye’ (1.8), ‘Tapdong’ (1.8), and ‘Jinpoom’ (1.6) showed relatively good FHB resistance compared to ‘Sumai 3’ (0.6) for Type I evaluation. On the other hand, Type II evaluation scores ranged between 1.4 and 3.6. The infection scores of ‘Uri’ (1.4) and ‘Jinpoom’ (1.4) were particularly low and even lower than “Sumai 3” (1.6). The relationship between grain properties and FHB severity was evaluated. Grain length was positively correlated with Type II evaluation. Spike length and total polyphenol content were negatively correlated with FHB severity of Type I evaluation. Grain properties were negatively or positively correlated with FHB severity. The obtained results indicated that some of the grain parameters could be employed in the development of wheat lines with improved FHB resistance.  相似文献   

14.
旱种方式对水稻产量与品质的影响   总被引：16，自引：0，他引：16  
以汕优63为材料,通过稻草覆盖旱种、地膜覆盖旱种和常规水种（对照）比较试验,研究了旱种水稻产量与品质的表现。结果表明,覆草旱种产量与水种稻产量无显著差异,但显著高于覆膜旱种稻的产量。覆草旱种稻米的碾磨品质、外观品质、蒸煮品质和营养品质与水种稻无显著差异,而覆膜旱种稻米的垩白度明显高于水种稻,胶稠度和碱解值则显著低于水种稻。水稻旱种后,淀粉谱的最高黏度和崩解值降低,消减值提高,覆膜旱种尤为明显。旱种稻的地上部干物质积累量减少,根干重增加,物质运转率和收获指数提高,灌浆中后期根系活力下降较快。表明覆草旱种的产量、稻米品质以及物质生产均优于覆膜旱种。对覆草旱种和覆膜旱种在产量和品质形成上的差异进行了讨论。  相似文献   

15.
Cadmium (Cd) accumulation in wheat genotypes of spring bread wheat (Triticum aestivum L.) and spring durum wheat (Triticum turgidum var. durum) was studied in field trials every third week throughout the growing season. The study was carried out in Sweden on three different soils and during two growing seasons. The results showed that the genetic variation in shoot and grain Cd accumulation remained consistent, regardless of soil type or growing season. In addition, it was possible to select the genotype that accumulated most Cd already at the beginning of the growing season, since this genotype also accumulated most Cd in the vegetative tissues of the shoot. These results indicate that it is possible to identify genotypes that accumulate most Cd in the grain at an early plant development stage. High Cd concentrations in the shoot were also observed to give high Cd concentrations in the grain. This indicates that the regulatory mechanism for grain Cd accumulation is not located in the shoot, but in the root or as a feature of root Cd uptake. The soil material and the soil solution at all three sites were analysed for strongly bound Cd (as extracted with 2 m HNO3), more easily plant‐available Cd (as extracted with ammonium lactate), pH, organic matter, clay content and conductivity. None of these parameters was clearly correlated to the Cd concentration in the grain.  相似文献   

16.
Inheritance of long grain rice amylograph viscosity characteristics   总被引：19，自引：0，他引：19  
Southern United States long grain rice (Oryza sativa L.) is a unique market type characterized by intermediate amylose content, gelatinization temperature, and amylograph viscosity profile characteristics. Rice breeders sometimes use long grain germplasm with differing amylograph viscosity profiles. The inheritance of rice amylograph viscosity profiles has not been ascertained and, thus, was the objective of this study. A six parent diallel (parents plus F1 hybrids) was evaluated at Stuttgart, AR during 1994 and 1995. In 1994, 65 F2 plants from the ‘L-202’ × ‘Newrex’ and L-202 × ‘Katy’ crosses were space planted, and in 1995, the 65 F2:3 lines were planted as hill plots. The inheritance of amylograph viscosity profiles appeared to be controlled by a single locus with genes with additive effects. The results of the diallel analysis also support control by a single locus with genes with additive effects because GCA effects were significant and SCA effects nonsignificant for peak, hot paste, and cool paste viscosities. Intermediate amylose content and intermediate amylograph viscosity profiles were strongly correlated. Selection first for intermediate amylose content followed by reselection for intermediate hot paste viscosities would identify long grain genotypes with southern United States long grain cooking quality in progeny from crosses between southern United States long grain rice genotypes and softer cooking long grain genotypes. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

17.
不同基因型水稻镉积累动态差异分析   总被引：5，自引：1，他引：4  
探讨镉(Cd)在籽粒Cd积累量差异较大的2个常规籼型水稻品种‘黄华占’（Cd低积累）和IR68144（Cd高积累）各器官中的分布差异和积累动态,分析了在大田栽培条件下2个品种全生育期和生殖生长期各组织器官的Cd积累动态过程。结果表明：成熟期两品种植株的大部分Cd都集中于根系和茎部,IR68144各器官的Cd含量都高于‘黄华占’。在整个生育期中,‘黄华占’根和茎中的Cd含量都呈缓慢上升趋势,IR68144根系Cd含量先上升后下降,最后于灌浆后期快速上升,其茎部Cd含量则先下降后上升;两品种叶片Cd含量在抽穗前变化趋势表现一直,而在抽穗后却截然相反。抽穗后,‘黄华占’剑叶和穗轴Cd含量先持续上升,后于黄熟期有所下降,而IR68144的剑叶和穗轴都呈持续上升趋势,两品种的颖壳和糙米的Cd含量也都整体上升,且同品种的两器官表现趋于一致。籽粒发育过程中,两品种糙米Cd积累量都不断地提高,但它们超过一半的Cd由抽穗后的第21~28天积累完成。  相似文献   

18.
Using two sets of chromosome segment substitution lines (CSSLs) of crosses between cvs. ‘Koshihikari’ and ‘Kasalath’ (Ko/Ka) and between ‘Koshihikari’ and ‘Nona Bokra’ (Ko/NB), respectively, we have identified alleles for ten traits related to productivity (e.g., harvest index and biomass) in rice (Oryza sativa L.). A total of 43 chromosome regions affecting traits (CRATs) in Ko/Ka CSSLs and 40 in Ko/NB CSSLs were detected. Among them, ten and 18 CRATs in Ko/Ka and Ko/NB CSSLs, respectively, had positive effects. A CRAT for harvest index (HI) with a positive allele from ‘Kasalath’ on chromosome 6 (tentatively named HI6) increased the HI by 25 % relative to ‘Koshihikari’, raising it to the theoretical upper limit in rice (0.6). Functional analysis using CSSLs with HI6 indicated that HI6 reduced the size of the lower parts of the plant, which is not important for production, while maintaining the size of the other organs related to production (e.g., flag leaf and panicle), resulting in improved nitrogen (N) use efficiency. These results suggest an ‘ideal plant type’ with improved N use efficiency that can sustain higher yields. A CRAT for the SPAD (soil plant analysis development) value, which is a chlorophyll meter value commonly used as an indicator of leaf N content and strongly associated with the source ability of a leaf, with a ‘Nona Bokra’ allele on chromosome 4 increased the value by 13 % relative to ‘Koshihikari’ with no loss of leaf area. These CRATs can be used for the improvement of rice productivity.  相似文献   

19.
Low grain cadmium (Cd) and high grain zinc (Zn) rice cultivars have become the current rice breeding objectives. However, the genetic control of Cd and Zn concentrations in brown rice remains poorly understood, especially when grown in Cd-contaminated soil. In this study, quantitative trait loci (QTLs) associated with grain Cd and Zn concentrations and Cd/Zn ratio were identified using a doubled haploid population derived from a cross between japonica JX17 and indica ZYQ8 rice cultivars. Three and two QTLs were detected for Cd and Zn concentration in brown rice, respectively. Two QTLs associated with grain Cd/Zn ratio on chromosomes 3 and 6 were initially mapped. These QTLs accounted for 10.83–41.66% of the total variance of the three traits measured. Only one common locus on chromosome 6 was found for Cd concentration and Cd/Zn ratio. The lack of co-location of the QTLs for Cd and Zn concentrations in this mapping population suggests different genetic mechanisms. In summary, our results provide insight into the genetic basis of rice grain Cd and Zn accumulation; the isolated QTLs may be useful for marker-assisted selection and identification of genes associated with Cd and Zn accumulation in rice.  相似文献   

20.
镉胁迫对棉花幼苗生长效应及不同器官镉积累的影响   总被引：3，自引：2，他引：1  
以转基因抗虫棉品种农大棉9号(ND9)和国欣棉3号(GX3)为材料,设4个镉(Cd)处理(0μmol·L-1、25μmol·L-1、50μmol·L-1、100μmol·L-1)。结果表明:随Cd处理浓度升高,棉苗干物质质量、根系总根长、总表面积和总体积呈下降趋势;根冠比和根系直径呈升高趋势。Cd在根、茎、叶中的积累量表现为(叶片+叶柄)根系茎。当Cd处理浓度为50μmol·L-1时的转移率(TF)达到最大,为对照的2.2倍;处理浓度为100μmol·L-1时,TF则呈下降趋势。表明Cd胁迫增加棉苗体内Cd积累量,根系生长受到抑制,阻碍地上部植株发育,最终对棉苗产生毒害作用。  相似文献   

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