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小麦籽粒中戊聚糖含量的初步研究 总被引:7,自引:3,他引:7
1999~ 2 0 0 0年对河南省八个有代表性的小麦品种的戊聚糖进行了测定。不同品种戊聚糖的平均含量变化范围为 6 %~ 9%。不同品种和不同生态条件下小麦籽粒戊聚糖含量均有很大差异。 5个试点小麦籽粒戊聚糖的平均含量与千粒重、降落值均成负相关关系 (r =- 0 .83 ,r =- 0 .31) ,而与蛋白质的含量却呈正相关关系 (r =0 .35 )。所以说 ,戊聚糖含量很大程度上依赖于环境和生态因素。采用Eberhart Russell模型对小麦戊聚糖含量的稳定性进行分析 ,发现豫麦 34是戊聚糖含量较理想的品种 相似文献
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种植密度对3个玉米杂交种产量及品质的影响 总被引:30,自引:7,他引:30
2002年在吉林省梨树,以中单9409、郑单18和哲单14为试材,在30000、60000、90000和120000株/hm2种植密度下,研究了种植密度对3个玉米品种产量及子粒品质的影响。结果表明,3个品种产量的种植密度效应基本相同,产量随种植密度增加先升后降。随种植密度增加,高淀粉玉米郑单18的蛋白质含量和油分含量逐渐下降,淀粉含量上升,而蛋白质、油分、淀粉含量之和穴POSC雪呈现升-降-升的变化趋势。普通玉米哲单14蛋白质含量和POSC随种植密度增加而上升,淀粉含量下降,而油分含量呈现降-升-升趋势。优质蛋白玉米中单9409随种植密度增加POSC和油分含量呈下降趋势,而蛋白质含量和淀粉含量变化较为复杂。以上表明,玉米子粒养分含量在不同种植密度时品种间具有很大的差异。 相似文献
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通过对辽宁省14个玉米主栽品种抗性和内生细菌相互关系的研究,明确了苗期不同品种间内生细菌总量差异显著性达到α=0.05水平,而抽丝期品种间差异不显著,苗期与成株期的互作差异亦不显著;品种苗期与成株期内生细菌种群总量不相关;不同品种苗期和成株期纹枯病抗性均存在显著差异(α=0.01);玉米纹枯病品种抗性与内生细菌总量不相关,而与拮抗内生细菌百分率呈显著正相关。 相似文献
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3种不同抗蓟马水平的榕树叶片表面超微结构和蜡质成分及含量的比较 总被引:1,自引:0,他引:1
为判定叶片表面结构及蜡质是否会影响寄主植物的抗虫性,以3种不同抗蓟马水平的榕树叶片作试验材料,通过扫描电镜观察叶片表面的超微结构,利用气相色谱-质谱联用仪(GC-MS)检测叶片表面的蜡质成分及含量,比较差异性。结果表明:3种榕树叶片的表面蜡质、表皮细胞、气孔器等微形态结构明显不同,高感品种蜡质平滑,表皮细胞山脉状突起细微,气孔密度和长度均较小;低感品种蜡质略显粗糙,表皮细胞山脉状突起略显丰富,气孔长度最长;高抗品种蜡质最为粗糙,表皮细胞山脉状突起纵横交错,气孔密度最大。3种榕树叶片的表面蜡质总量存在极显著差异,高感品种和低感品种的蜡质总量相对较高;每个品种的蜡质提取液可鉴定出21种已知化学结构的化合物,各类化合物相对含量随品种抗性的不同会有所变化,醇类占比随品种抗性水平的提高而提高,烃类相反,酸类、酯类和酮类则互有高低;各主要组分的离子峰面积随品种抗蓟马水平的高低而呈现大小排序变化,含量的变化均可影响榕树品种的抗蓟马水平。 相似文献
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杂交稻米必需氨基酸含量与亲本的关系 总被引:8,自引:3,他引:8
根据9个不育系、5个恢复系以及由此配制的45个不完全双列杂交组合氨基酸含量的测定结果,分析了不同组合氨基酸含量的差异及其与亲本的关系。结果表明不育系和恢复系的必需氨基酸平均含量为3.202%~4.889%,占氨基酸总量的31.796%~33.394%;而杂交组合的必需氨基酸平均含量为3.616%~4.858%,占氨基酸总量的32.176%~33.016%;必需氨基酸含量依次是亮氨酸>缬氨酸>异亮氨酸>苏氨酸、赖氨酸、苯丙氨酸>蛋氨酸。平均氨基酸总量和必需氨基酸含量都有一定的杂种优势,但各组合间差异明显。 相似文献
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本文报导了一个新的大豆斑驳粒微量“总黄酮”的分析方法,。采用Zr^4+与黄酮类化合物生成有荧光的络合物,借薄层色谱扫描技术,测定滤纸荧光斑点的峰面积积分值,用于定量分析。Zr^4+在酸性条件下与黄酮类化合物的络合作用可使类黄酮化合物定性,并有利于区别于黄烷醇类化合物。该方法应用盱大豆感染SMV产生斑驳的发生机理研究,有良好的效果。 相似文献
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Feeding by corn earworm, Heliocoverpa zea (Boddie), larvae lowers the quality of food maize by causing damage to kernels that results in discoloration of food maize products during cooking. This damage includes kernel cracking or nipping of kernels by larvae. Larval infestations were highest from first silk to early dough growth stages. Infestations during the silk and blister-dough stages caused the least amount of kernel damage on an ear. The area on an ear exposed to corn earworm damage during the blister, dough, or dent to harvest treatments was similar. Kernels were most susceptible to quality loss when they were hardening. Yield was not affected by corn earworm feeding, but the highest quality loss occurred on ears exposed to earworms during the dent-harvest period and throughout the season. Consequently, late season control actions (during the dough stage) would be more effective for reducing quality loss from corn earworm feeding on food maize, than is the present practice of spraying during the green silk stage. 相似文献
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甜玉米果穗不同计产方法对产量评价的影响 总被引:1,自引:0,他引:1
以30个鲜食甜玉米品种为试材,研究果穗不同计产方法(第1果穗计产、所有果穗计产和商品果穗计产)对产量评价的影响。结果表明,3种计产结果在甜玉米不同品种间存在极显著差异,第1穗净果穗计产结果比商品穗产量高0~35.78%(除个别品种外);所有净穗计入产量结果比商品穗产量高0.08%~35.78%,且各百分率在不同品种间存在差异,以商品果穗计产比较科学。商品果穗标准为非霉变果穗,除去苞叶、花丝、穗柄、虫咬、损伤、秃尖及秃基部分的完好净穗有效长度至少不短于10cm的果穗。 相似文献
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Natalia V. Zaimenko Nataliіа A. Pavlіuchenko Bogdana О. Ivanytska Iryna P. Kharytonova Nadiya V. Rositska 《Journal of Crop Improvement》2018,32(2):188-207
Soil salinity is one of the major environmental constraints to crop productivity worldwide. Therefore, the development of cost-effective and environment-friendly techniques allowing increased crop productivity and soil fertility under saline conditions is rather urgent today. The objective of this investigation was to study the effects of mixtures containing natural silicates (analcite, bergmeal, and potassium silicate) and organic fertilizers (sapropel, peat) in corn (Zea mays L.). We specifically evaluated tolerance of corn to salinity stress and certain characteristics of saline soil (viz., redox potential, conductivity, and phytotoxicity) using a factorial pot experiment, modeling NaCl salinity levels of 0, 50, 100, 150, and 200 mM under greenhouse conditions. Growth, water balance, photosynthesis, catalase activity, and accumulation of nonenzymatic antioxidants (flavonoids and anthocyanins) were measured and evaluated. Salinity stress reduced shoot and root biomass by 8–49%, photosynthetic pigment content in leaves by 15–30%, deteriorated water balance, and activated nonspecific adaptive reactions (i.e., accumulation of enzymatic and nonenzymatic antioxidants) in the corn seedlings. All the tested silicon-containing mixtures stimulated corn seedling resistance to salt stress and reduced soil phytotoxicity. This was reflected in the stimulation of growth of the corn seedlings (accumulation of shoot biomass, and formation and growth of lateral roots). The content of photosynthetic pigments, flavonoids, anthocyanins, catalase activity increased 1.3–2 times compared with plants that received NaCl only. The difference between treatments and control was most pronounced at moderate levels of salinity (100–150 mM). The mixture containing silicon minerals and sapropel (9:1 proportion) showed the highest protective effect against salinity stress. 相似文献
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Weiguo Chen Zongqian Wang Zhihua Cui Zhaocheng Meng Min Huang Donghui Pan 《Fibers and Polymers》2014,15(5):966-970
This paper describes how coloration of silk can be achieved using a coupling reaction between a diazonium compound, made from Color Base Red G (C.I. 37105) and tyrosine residues in the silk protein fibroin. A pigment with an azo structure obtained from the reaction between the diazonium of Color Base Red G with p-methylphenol was synthesized and studied as a model compound for the coloration reaction. The colored materials were characterized using UV-vis, FT-Raman, FT-IR, 1H-NMR, and mass spectroscopy. Both the colored silk and the model compound gave yellow colors with absorption maxima in the region of 400 nm. The results suggest that the use of coupling reactions could be developed into a dyeing method for protein fibers or other protein materials that contain tyrosine residues. Because the chromophores are incorporated into the protein chains, such dyed silks should have good wet fastness properties. 相似文献
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玉米花丝和穗轴中可溶性糖、淀粉变化规律的研究 总被引:1,自引:3,他引:1
在一般大田环境中,控制玉米果穗的授粉情况,研究果穗在套袋和自然授粉时可溶性糖和淀粉在花丝和穗轴中的变化情况。结果表明:花丝和穗轴中的可溶性糖、淀粉浓度均呈单峰变化,可溶性糖以及花丝中淀粉浓度峰值出现在吐丝后第5天,而穗轴中的淀粉浓度峰值出现时间提前2天。花丝不同部位间可溶性糖浓度由基部向顶部依次下降。而积累量随着生育进程的推进而上升,但后期花丝中的物质含量相对稳定。从总体来说,无论套袋还是自然授粉的果穗,各物质变化趋势一致,但后期授粉果穗的可溶性糖和淀粉积累量高于套袋果穗。 相似文献
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西南地区玉米大斑病菌生理小种鉴定 总被引:2,自引:0,他引:2
2008~2010年对采自西南地区的玉米大斑病标样经过单孢分离、纯化,共获得146个菌株。通过Ht单基因鉴别寄主进行生理小种鉴定,共鉴定出9个生理小种,分别为0、1、2、3、12、1N、2N、3N、N。0号小种占鉴定菌株的62.33%,为优势小种,其次为1号小种,占鉴定菌株15.07%。毒性频率分析表明,所有供试菌株对Ht1抗性基因的毒性频率最高,为20.99%;对Ht3抗性基因的毒性频率最低,为1.36%;对Ht2和HtN抗性基因的毒性频率分别为13.01%和9.57%。目前,西南地区玉米大斑病生理小种分化明显,并且产生了新的生理小种,对玉米生产存在潜在威胁。 相似文献
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黄酮类与儿茶素类物质对茶叶感官品质和生物活性起重要作用,因此建立一种茶叶中总黄酮(包括黄酮类和儿茶素类)含量的测定方法很有必要.采用70%甲醇提取茶样,以芦丁为对照品,利用亚硝酸钠-硝酸铝-氢氧化钠溶液显色,在510 nm下测定吸光度,建立测定茶叶中总黄酮含量的分光光度法,并对其进行方法学考察.应用该法测定了绿茶、白茶、乌龙茶和红茶4个茶类15个茶样中总黄酮含量,采用福林酚法测定其茶多酚含量,并比较二者相关性.结果表明,芦丁质量浓度在0.2~1.0 mg·mL-1范围内与吸光度线性关系良好,回归方程为Y=1.2465X+0.0074(R2=0.9997).方法学考察结果表明,该方法精密度、重复性和稳定性的吸光度RSD为1.17%、2.92%和6.01%,平均加标回收率为84.35%(RSD=4.15%).15个茶样中总黄酮含量范围为5%~10%,总黄酮含量规律为:绿茶、白茶>乌龙茶>红茶.福林酚比色法测得茶多酚含量范围为7%~15%.双变量相关性分析显示,总黄酮含量与茶多酚含量呈极显著正相关,Pearson相关系数达0.874.由此表明,该方法操作简便,精密度、重复性与稳定性好,可用于茶叶总黄酮含量测定. 相似文献