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1.
60Co-γ射线诱变小麦品质突变体的筛选及分子标记检测   总被引:1,自引:0,他引:1  
来德娥  赵平  王敏  张从宇 《种子》2012,31(5):5-10
为了探索小麦品质性状的物理诱变效应,用300Gy的60Co-γ射线辐射小麦品种河科2号的干种子,对M3代234个株系的蛋白质含量、湿面筋含量、沉降值、硬度和产量性状进行变异分析和SSR分子鉴定,以超过均值±2×标准差确定变异株系.结果表明,在M3代群体中,蛋白质含量有13个株系发生正向变异,5个株系发生负向变异;湿面筋含量有8个株系发生正向变异,3个株系发生负向变异;沉降值有6个株系发生正向变异,3个株系发生负向变异;硬度有2个株系发生正向变异,9个株系发生负向变异;产量有5个株系发生正向变异,4个株系发生负向变异.相关分析表明,M3群体蛋白质含量、湿面筋含量、沉降值呈极显著正相关,表现出平行变异的趋势.初步筛选出蛋白质含量和湿面筋含量符合国家强筋小麦标准(蛋白质含量≥15%,湿面筋含量≥35%)的株系8个.经SSR分子标记检测,与控制小麦蛋白质含量的基因存在连锁的2个特异引物Xbarc164和Xgwm161在以上8个变异株系都呈现多态性标记,表明这些株系与蛋白质含量相关的基因可能发生了变异.  相似文献   

2.
不同剂量中子辐射针叶豌豆的M1代效应研究   总被引:2,自引:2,他引:0  
研究不同中子吸收剂量对豌豆产生的M1代生物学效应,为放射生物学研究和中子辐射诱变育种提供重要参考。本研究用252Cf源发射的中子对针叶豌豆(Pisum sativum L.var MZ-1)的干种子进行了辐射,研究了M1代豌豆生长过程中形态和生理方面的生物学效应。结果表明:中子辐射(0.24~4.33 Gy)对M1代豌豆的萌发能力和幼根的生长均有一定的促进作用,低吸收剂量的中子辐射(0.38 Gy)能够显著促进豌豆的萌发和幼根的生长,较高中子吸收剂量(1.66、4.33 Gy)的辐射对M1代豌豆苗期株高的生长有抑制作用,较低中子吸收剂量(0.24、0.38、0.84 Gy)的辐射对M1代豌豆苗期株高的生长有促进作用。微剂量(0.24、0.38 Gy)的中子辐射不会引起M1代豌豆的形态变异,中子吸收剂量在0.84~4.33 Gy间,可以引起M1代豌豆分枝致变。以上结果说明,0.24~4.33 Gy的低吸收剂量的中子辐射豌豆干种子能够使M1代豌豆产生生物学效应,且有比较明显的规律,可以用于辐射育种研究。  相似文献   

3.
为研究石斛兰辐射诱变后的植株性状遗传变异程度,本研究利用SRAP分子标记对不同剂量~(60)Co-γ射线处理后的石斛兰D.soni‘a166’品种组培苗进行分析,探讨其辐射诱变效应,确定最佳的辐射剂量。结果表明:利用从100对引物中筛选出的12对引物对不同剂量处理的石斛兰基因组DNA进行扩增,共扩增出了216条带,其中多态性带41条,多态率为19.0%。对不同处理及对照扩增的谱带进行聚类分析发现,各个剂量的辐照处理群体都发生了不同程度的变异,20 Gy处理整体变异程度最大,5 Gy变异最小。因此,认为石斛兰D.soni‘a166’品种组培苗的最佳辐射诱变剂量为20 Gy。  相似文献   

4.
采用SSR-PCR扩增技术,将实验室利用高通量测序与磁珠富集法结合开发得到的1 210对黍稷SSR引物进行筛选,筛选出在会宁大黄糜、陇糜8号、太原55号和会宁野糜子4个黍稷品种之间表现出条带清晰、多态性明显、重复性较好的引物;并通过提取DNA以及PCR过程中退火温度的简单优化来建立比较适宜的黍稷SSR分子标记反应体系。结果表明,在DNA提取过程中将ddH2O的量减少到100μL,增加65℃的水浴时间并增加4%β-巯基乙醇和DNA浓度等可以获得较高质量的DNA。利用优化好的反应体系从1 210对SSR引物中筛选出116对多态性较好的引物,占总数的9.59%,其中,群体一的2个亲本所特有的引物有36对,群体二的2个亲本中特有的引物有97对,2个群体共有的多态性引物有19对;对引物碱基结构分析发现,选用的1 210对引物中有1 173个双碱基重复SSR和36个三碱基重复SSR;筛选到的多态性引物中双碱基重复SSR有102个。三碱基重复SSR有14个。筛选出的多态性SSR标记能用于黍稷的遗传多样性和群体遗传结构研究。  相似文献   

5.
NaN3对宝巾的诱变效应初步研究   总被引:1,自引:1,他引:0  
以宝巾品种为材料,采用NaN3诱变体系建立宝巾变异群,研究其诱变效应和遗传效应;统计了VM1代群体中的变异性状种类及各剂量水平下的变异率,建立了反映剂量和存活率关系的回归方程:Y=101.307-10.201X,R2=0.8922,确定了NaN3对宝巾诱变的半致死剂量为5.03mmol/L,剂量和存活率呈显著的负相关;一定范围内剂量和变异率呈正相关;对VM1代中的9个变异株进行了过氧化物同工酶分析,指纹图谱显示,BN6和BN7是有育种价值的变异株系,其与母本材料的相似系数分别为0.80和0.83。  相似文献   

6.
利用250 Gy的Co60γ射线对3个棉花品种的干种子进行辐射处理,对其M4,M5农艺经济性状的遗传变异进行分析。结果表明:3个品种的辐射诱变后代M4,M5群体表型性状变异系数和遗传多样性指数均存在明显差异。阐明了辐射对不同棉花品种的诱变效果存在变异均匀度和丰富度的差异。相关分析表明,所有表型性状,以及衣分、单铃重、株高、2.5%跨长、比强度和麦克隆值等性状的M4与M5群体之间的简单相关系数都达到极显著水平。证明了诱变后代材料表型性状的变异可以遗传,M4和M5群体表型性状的遗传变异趋于稳定。3个品种诱变后代M5材料间的表型性状遗传距离变幅分别为1.83-34.68,1.26-34.55,2.22-17.05;并筛选出一系列变异明显的诱变材料。  相似文献   

7.
为了明确引进糜子种质资源的遗传多样性,以来自中国不同生态区的22份糜子品种为材料,利用SPSS软件和SSR分子标记进行农艺性状相关性、方差分析和聚类分析。结果表明,(1)农艺性状的变异范围为6.54%~45.43%,变异幅度由大到小分别为:穗粒重单株穗重单株草重亩产量茎粗主穗长主茎节数主茎长千粒重;主茎长与主穗长、单株穗重、主茎节数、茎粗、单株草重、穗粒重呈极显著正相关,穗粒重与主茎长、主穗长、单株穗重、主茎节数、茎粗、单株草重、千粒重呈极显著正相关,但均与亩产量无显著相关性。‘陇糜11’、‘宁糜13’、‘宁糜14’、‘固糜21’和‘赤糜2号’等5份品种的亩产量大于其余17份品种,且差异达到显著水平;‘陇糜9号’、‘宁糜16’、‘宁糜17’、‘内糜5号’、‘榆糜2号’等5份品种的亩产量相对较低。(2)以阈值2.0将供试22份糜子材料分为5大类群。第一类亩产量最低包括‘宁糜16’‘、宁糜17’‘、榆糜2号’;第五类亩产量最高,包括上述‘陇糜11’等5份品种,其中‘陇糜11’和‘宁糜14’的亩产量分别为3 847.35kg/hm~2和3 786.75 kg/hm~2。(3)SSR分子标记检测到BM552等17对多态性较好的SSR引物,参试品种的相似性系数在0.67~0.99之间,在相似性系数为0.77处,将糜子品种分为6大类群。其中第一类群包括‘陇糜5号’等15份品种,来源于西北春糜子区、呼和浩特和赤峰。第二类群包括‘陇糜11’、‘宁糜13’、‘宁糜9号’。第三、第四、第五、第六类群各有1个品种,依次分别为‘内糜6号’、‘陇糜10号’、‘宁糜16’、‘伊糜5号’。  相似文献   

8.
对甜玉米自交系1 132种子经过空间诱变的材料进行表型鉴定和自交繁殖,在SP2代植株发现穗行数、穗粗、穗轴粗和穗粒重等产量性状上出现变异的果穗,通过连续自交获得穗行数、粒深、穗粗比对照明显增大的稳定变异株系,其根系也明显发达.利用分布在10条染色体的198对引物对16份稳定变异株系的进行SSR多态性分析,发现32对引物...  相似文献   

9.
陆地棉抗黄萎病性状的遗传及分子标记研究   总被引:11,自引:4,他引:7  
 以陆地棉抗黄萎病品系常96和感病品种军棉1号为研究材料,构建了一个含有138个F2单株的作图群体。利用强致病力菌株VD8对P1、P2、F1、F2:3群体进行营养钵接种,估算各世代的相对病指。应用主基因 多基因混合遗传模型分析得出该组合的最适遗传模型为C-0模型,即加性-显性-上位性多基因模型。对1998对SSR引物和230对SRAP引物进行筛选,获得148个SSR和6个SRAP多态性标记位点,进一步利用MAPMAKER作图软件,构建了一张含122个标记位点的陆陆杂种遗传连锁图。利用复合区间作图法在第9染色体NAU462-JESPR114区间内,检测到1个抗黄萎病QTL,可解释的表型变异为13.8%。  相似文献   

10.
为明确马铃薯杂交组合YSP-4×陇薯7号杂种F1的4个优良无性株系(株系3、株系5、株系6、株系12)间在产量和营养品质及DNA水平上的遗传差异,采用田间农艺性状观测、常规营养成分测定方法及SSR分子标记技术对其进行了研究.结果表明:4个优良无性抹系中,以株系12和株系6的产量及营养品质性状表现较为突出,前者为高产株系,后者为高淀粉株系;筛选出S174和S118适宜引物2对,PCR扩增建立了能识别出4个马铃薯杂种株系及其亲本的SSR指纹图.  相似文献   

11.
为探索适于绿豆突变体库构建的最佳甲基磺酸乙酯(EMS)浓度和处理时间,以‘皖科绿3号’种子为研究材料,设置4种EMS浓度(0.6%,1.0%,1.4%和1.8%)和4种时间(6 h,10 h,14 h和18h)共16个组合,并以半致死剂量为突变体库构建的条件。结果表明,‘皖科绿3号’的最佳诱变条件为1.0%/10 h。用该条件处理6000粒成熟的‘皖科绿3号’种子,获得M1代植株998份。对M2代群体中植株叶色、叶形、株高、花器官、开花期等性状进行鉴定。共发现表型变异材料324株,变异频率为2.97%。突变体中叶色变异和矮秆是主要的变异类型,分别占植株总数的1.10%和0.46%。利用基因组重测序技术对4份突变材料的突变位点进行鉴定,测序结果表明碱基突变频率为1/37.78 kb。实验确定‘皖科绿3号’的最佳诱变条件为1.0%/10 h。研究结果也表明利用EMS诱变的方法可获得丰富的表型变异材料,可用于绿豆品种遗传改良和功能基因组学研究。  相似文献   

12.
盐渍化土壤中盐胁迫是作物种子萌发和生长发育的主要限制因子,探究盐分胁迫下提高种子萌发率的技术及机制对开发利用盐碱地有重要意义。本文以不同耐盐能力的高粱品种国甜2011和国甜106为材料,研究了盐分对甜高粱种子萌发期生长过程的影响,并比较了耐盐性差异。以耐盐性弱的国甜106为试材,探究盐分胁迫下不同生长调节物质[γ-氨基丁酸(GABA)、赤霉素(GA3)、激动素(KT)和水杨酸(SA)]对甜高粱种子吸水萌发过程中生长特性的调节效应。表明,盐分胁迫显著抑制种子的吸水萌发,降低种子的吸水速率、发芽势、发芽率、发芽指数,增加种子的相对盐害率和丙二醛(MDA)含量。外源生长调节物质可有效缓解盐害,显著增加种子的吸水率、发芽率、可溶性糖含量、可溶性蛋白含量,提高SOD (超氧化物岐化酶)、POD (过氧化物酶)、CAT (过氧化氢酶)的活性,促进K+、Ca2+、Mg2+离子的吸收,降低Na+和MDA含量。外源生长调节物质主要是通过提高保护酶活性、渗透调剂物质含量和维持体内离子平衡来提高耐盐性。GA3和GABA对盐害的缓解效应较好,而KT促进种子对Mg2+的吸收效果较好。本研究表明外源生长调节物质(尤其是GA3和GABA)可用于盐碱地高粱生产,为减轻盐碱地对高粱的盐碱胁迫提供了理论依据。  相似文献   

13.
A simple randomized field experiment was conducted to assess the growth and yield of rape-seed-mustard in relation to sulphur and nitrogen interaction. Three levels of sulphur (0, 40 and 60 kg ha−1) in combination with three levels of nitrogen (60, 100 and 150 kg ha−1) were tested as treatments, T1, T2, T3, T4, and T5. Results indicated significant favourable effects of sulphur and nitrogen, when applied together, on yield components, seed and oil yield. Maximum response was observed with treatment T3 (having S and N of 40 and 100 kg ha1, respectively). Percentage oil content of seed was maximal at T4 (having S and N of 60 and 100 kg ha1) in both cultivars. The increase in N dose from 100 to 150 kg ha−1 without any change in applied S, i.e. 60 kg ha1 (T5), decreased the percentage oil content. The seed and oil yield, however, were similar to T3. Favourable responses of S and N interaction on leaf area index, rate of photosynthesis and biomass production were also observed.  相似文献   

14.
The first step in the biological control of plant diseases is to determine whether antagonistic microorganisms can colonize successfully the plant rhizosphere soil. Bacillus Z-5 was isolated from cotton plant soil and showed a significant biocontrol effect on cotton Verticillium wilt. The strain Z-5 was marked with resistance to rifampicin and pathogenic fungi. A Z-5 mutant strain that could stably grow in 300 μg·mL-1 rifampicin NA medium and had wild-type antagonistic activity against pathogen fungi, colony morphology, and cell morphology was selected. The marked strain Z-5 was used to treat cotton seeds by seed soaking, seed dressing, and soil drench. The number of Z-5 cells in cotton plant root soil, roots, stems, and leaves was tested using dilution on rifampicin plate after different periods. The result showed that the number of antagonistic bacteria of soil drench group in cotton plant root soil was 49.72×104 cfu·g-1, while seed soaking and seed dressing groups yielded about 0.49×104 and 2.07×104 cfu·g-1. The number of antagonistic bacteria of the soil drench group in cotton plant roots was 4.93×104 cfu·g-1, while the seed soaking and seed dressing group yielded 4.12×104 and 3.29×104 cfu·g-1.The number of antagonistic bacteria of the soil drench group in cotton stems was 1.32×104 cfu·g-1, while the seed soaking and seed dressing group yielded 0.17×104 and 0.74×104 cfu·g-1. The number of antagonistic bacteria of soil drench group in cotton leaves was 0.27×104 cfu·g-1, while seed soaking and seed dressing group yielded 0.17×104 and 0.22×104 cfu·g-1. These results showed that the Z-5 strain could effectively colonize cotton roots soil and that in vivo , the soil drench group showed a better colonization effect by the strain Z-5 than the seed soaking and seed dressing group.  相似文献   

15.
Fixed position experiments were conducted in 2017 and 2018, and split plot arrangement with the main treatment for full irrigation (W1) with irrigation amount was 4800 cubic meters per hectare and deficit irrigation (W2) was 2400 cubic meters per hectare, and the secondary treatment including treatments without fertilization (CK), single application of chemical fertilizer (CF), 75% chemical fertilizer with 25% organic fertilizer (M1), 50% chemical fertilizer with 50% organic fertilizer (M2), and 25% chemical fertilizer with 75% organic fertilizer (M3). The effects of chemical fertilizer reduction and organic fertilizer application on photosynthetic characteristics and yield of cotton were studied to provide theoretical basis for rational utilization of organic fertilizer and reduction of chemical fertilizer input under water deficit. Under deficit irrigation, leaf area index (LAI), net photosynthetic rate (Pn), stomatal conductance (Gs), above-ground dry matter accumulation and seed yield of cotton were all lower than that under full irrigation, while irrigation water productivity (IWP) and intercellular CO2 concentration (Ci) were higher. The chemical fertilizer reduction combined with application of organic fertilizer could effectively improve the LAI after the full squaring stage, improve Pn and Gs of cotton in all stage, promote the accumulation of vegetative and reproductive organs dry matter, improve its transfer to the reproductive organs, improve the IWP and seed yield, and also increase the moisture content of soil surface in the period of full boll stage and boll opening stage. The effects among different organic fertilizer treatments on LAI, Pn and seed yield were all presented as M1 > M2 > M3, and under the treatment of M1, the average seed cotton yield of two years increased compared with CF and CK by 6.9% and 62.1% respectively. Whereas, the effects under deficit irrigation were presented as M2 > M1 > M3, and the two years’ average seed yield increased by 19.9% and 79.3% respectively compared with CF and CK under M2. Chemical fertilizer reduction and organic fertilizer application were beneficial to increase the yield of seed cotton under water deficit, and alleviate the influence of water deficit on cotton growth and development, M2 (50% fertilizer +50% organic fertilizer) was the best treatment.  相似文献   

16.
水分胁迫对糜子植株苗期生长和光合特性的影响   总被引:8,自引:0,他引:8  
冯晓敏  张永清 《作物学报》2012,38(8):1513-1521
选取耐旱性不同的糜子品种陇糜4号(强抗旱)、晋黍7号(旱敏感)和5283黄(中等抗旱),采用盆栽控水试验,调查不同水分处理对糜子苗期主要性状和光合参数的影响。结果表明:(1)水分胁迫下各品种的株高、叶面积、根重、叶绿素含量、根系活力均呈下降趋势,且陇糜4号的降幅小于5283黄和晋黍7号。(2)水分胁迫下,3个品种的固定荧光值(Fo)和非光化学猝灭系数值(qN)均显著增加,在重度胁迫后,陇糜4号、5283黄和晋黍7号的Fo值分别比对照增加24.6%﹑34%和40.8%,qN值分别增加0.956、1.083和2.183,且表现为旱敏感品种晋黍7号的增加幅度大于强抗旱品种陇糜4号;各品种的可变荧光(Fv)、最大荧光(Fm)、最大光化学量子产量(Fv/Fm)、PSII的潜在活性(Fv/Fo)、光化学猝灭系数(qP)值均因水分胁迫而降低。在中度和重度胁迫时,与正常灌水相比差异达显著水平,降幅以晋黍7号>5283黄>陇糜4号。(3)各品种的净光合速率、蒸腾速率、气孔导度及胞间CO2浓度均因水分胁迫而下降,强抗旱品种陇糜4号各值的变化幅度均小于中等抗旱品种5283黄和旱敏感品种晋黍7号,表明陇糜4号的光合参数受水分胁迫的影响最小,较高的电子传递速率和较强的光能转化能力是陇糜4号适应干旱环境的重要生理特性。(4)水分胁迫导致糜子叶片对强光的敏感性增加,干旱和光抑制对光系统II造成的叠加伤害随干旱加重和品种抗旱性减弱而加剧,因此,对强光下的糜子幼苗应及时补水,以避免干旱和高光强的叠加伤害。  相似文献   

17.
[Object] The study was conducted to investigate the plant architecture characteristic of direct sowing cotton planted after barely harvested with high yield and centralized boll-setting in the Yangtze River basin. [Method] In 2014, the cultivars Guoxin 12-1, Yijimian and Lumianyan 36 were used and the two conventional fertilizer (CF) application rates (namely pure nitrogen 45 kg·hm-2, 150 kg·hm-2) and Guoxin 12-1 was used in 2015. Two slow release fertilizer (SR) utilization rates (namely pure nitrogen 150 kg·hm-2 and 225 kg·hm-2) and two SR topdressing at different growth stages (namely 100% topdressing at seedling stage, 70% topdressing at seedling stage + 30% at flowing stage) were set with CF (pure nitrogen 150 kg·hm-2) and no fertilizer treatment as the controls. [Result] While the pure nitrogen (CF) amount was 150 kg·hm-2, the seed cotton yield of Guoxin 12-1 were 4 014.72 kg·hm-2. In 2015, the seed cotton yield for the treatment, application SR (pure nitrogen 150 kg·hm-2)and application ratios of seedling stage and flowering stage of 100% and 0, respectively, increased by 30.96%. The ratios of bolls setting from 08-15 to 08-30 to total bolls (RBT) for the two treatments were 31.8% and 26.1%, respectively. Then a significantly positive correlation between the seed cotton yield and RBT was found(r2014=0.948**, r2015=0.976**). Based on the analysis of relationship between the plant architecture indexes and RBT, plant architecture characteristics of cotton population with high yield and centralized boll-setting was proposed. [Conclusion] These indexes would be used to supervise the cotton culture management to achieve high yield and centralized boll-setting for the direct sowing cotton planted after barely harvested.  相似文献   

18.
研究氮肥对非充分灌溉下棉花花铃期光合特性及产量的补偿作用及其机制,以期为干旱地区棉花水肥高效利用提供理论依据。以"新陆中54号"为试材,采用裂区试验设计,主区为总灌溉量2800 m~3 hm~(–2)(非充分灌溉)和3800 m~3 hm~(–2)(常规灌溉),副区为4个施氮(纯N)水平(0、150、300和450 kg hm~(–2))。同一氮肥处理下,非充分灌溉处理棉花花铃期叶面积指数(LAI)、净光合速率(P_n)、蒸腾速率(T_r)、单株光合产物积累与分配、单株结铃数、单铃重及籽棉产量均低于常规灌溉处理,但籽棉增产率和灌溉水生产力高于常规灌溉处理;同一灌溉量下,随着氮肥施用量的增加,棉花花铃期LAI和单株光合产物积累量先增后降,且表现为N450N300N150N0,T_r、P_n、单株光合产物向生殖器官分配比例、单株结铃数、单铃重、籽棉产量、籽棉增产率及灌溉水生产力均表现为N300N450N150N0;非充分灌溉下增施氮肥的补偿效果随着氮肥用量的增加呈先增加后下降的趋势,N300处理补偿效果最显著,与常规灌溉处理相比,补偿效应主要表现在棉花花铃期P_n平均提高10.9%,单株光合产物积累向生殖积累器官分配比例提高10.7%,单株结铃数、单铃重、籽棉增产率及灌溉水生产力分别提高5.0%、8.0%、7.1%和7.5%;氮肥对棉花花铃期光合特性及产量构成因素的影响大于水分。非充分灌溉下氮肥施用量为300 kg hm~(–2)时补偿效应最大,虽然在产量上有所下降,但从干旱地区农业缺水的现实考虑,可准确灌溉施肥,且籽棉产量较常规灌溉处理仅下降1.3%。因此,在南疆自然生态条件下,非充分灌溉下施氮300 kg hm~(–2)时棉花花铃期LAI、T_r、P_n及单株光合产物积累量适宜,向生殖器官转运补偿效果显著,具有最大的产量补偿作用,且节水26.3%。  相似文献   

19.
种植密度对油菜机械收获关键性状的影响   总被引:5,自引:0,他引:5  
李小勇  周敏  王涛  张兰  周广生  蒯婕 《作物学报》2018,44(2):278-287
油菜机械化生产中,茎秆倒伏和角果开裂是引起产量损失的主要因素。为探究密度对油菜机械化关键性状的影响,以中双11、华油杂9号为材料,设置4个密度(15万株hm~(–2)、30万株hm~(–2)、45万株hm~(–2)和60万株hm~(–2)),测定产量构成、倒伏指数及抗裂角指数相关指标。结果表明,(1)不同密度下,群体有效角果数,每角粒数差异显著,2个品种产量均在45万株hm~(–2)时最大;(2)随密度增加,油菜根颈粗变细,茎秆倒伏指数增加,增加了倒伏风险;在低密度(15万株hm~(–2)和30万株hm~(–2))下,茎秆临近冠层部位最易倒伏,在高密度(45万株hm~(–2)和60万株hm~(–2))下,茎秆中部及中部偏上部位倒伏指数较大,即与低密度相比,高密度油菜茎秆倒伏发生部位降低;(3)分枝抗裂角指数均小于主茎抗裂角指数,且随分枝高度降低呈先增加后降低趋势。不同品种油菜主茎抗裂角指数对密度响应存在差异:中双11随密度增加逐渐降低,在15万株hm~(–2)下最大,华油杂9号则随密度增大呈先增后降趋势,在30万株hm~(–2)下最大。角果发育初期至成熟期含水量下降速率与抗裂角指数极显著负相关,且相关系数最大,表明该指标是密度影响抗裂角指数的最关键因素。  相似文献   

20.
以耐盐碱郑58和盐碱敏感昌7-2为亲本,构建包含151份F2:5重组自交系(RILs)群体。基于3K芯片对郑58、昌7-2及其F2:5家系进行基因型分析,构建了包含1407个SNP分子标记的高密度遗传连锁图谱。该图谱的各染色体标记数在84~191之间,标记间的平均距离为0.81 cM。胁迫液为200 mmol L–1 NaCl和100 mmol L–1 Na2CO3,对照液为蒸馏水或霍格兰营养液,对盐、碱胁迫和自然条件下玉米的发芽率(GP)、株高(PH)、植株干、鲜重(FW、DW)、幼苗组织含水量(TWS)、植株地上部分钠含量(SNC)、钾含量(SKC)、钠/钾含量比(NKR)、苗期耐盐率(STR)、耐碱率(ATR)10项指标,采用3种不同的作图方法同时定位研究,对加性QTL定位采用复合区间作图法(CIM)和完备区间作图法(ICIM),对加性QTL与环境互作联合分析采用混合线性模型的复合区间作图法(MCIM)。结果表明,(1)与对照条件下各性状表型值相比,耐碱相关性状的降低较耐盐相关性状明显,说明玉米对碱胁迫更加敏感和碱胁迫对玉米的伤害更严重。碱与盐胁迫下SKC相当而SNC差异较大,表明Na+、K+的吸收和运输是相互独立的两个过程,玉米盐、碱胁迫可能是两种性质不同的胁迫。(2)在自然、盐和碱胁迫条件下,运用CIM分别检测到27、28、40个加性QTL;运用ICIM分别检测到28、23、17个加性QTL;运用MCIM共检测到11个耐盐加性QTL、4个环境互作QTL以及11个耐碱加性QTL、3个环境互作QTL。(3)盐胁迫条件下的qPH-9、qSTR-8、qNKR-6、qNKR-7和碱胁迫条件下的qPH-9、qATR-3能被3种作图方法重复检测到。与前人结果比较, qPH-9、qSTR-8、qNKR-6、q-ATR-3定位在相同或邻近区域,qNKR-7尚未见报道。本研究结果为精细定位玉米耐盐碱主效基因、挖掘候选基因和开发用于标记辅助选择的实用功能标记奠定基础。  相似文献   

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