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1.
为探究不同樱桃番茄品种的综合特性,筛选出适合昆山地区栽培的高品质樱桃番茄品种,以 11 个不同的樱桃番茄品种为研究材料,测定了不同樱桃番茄品种的农艺性状、品质性状等 12 项指标,同时对各性状间的相关性进行 Pearson 分析,利用主成分分析和模糊隶属函数分析等方法对各樱桃番茄品种进行了综合评价。结果表明,不同樱桃番茄品种间各指标均存在显著差异,花穗数与单株结果数呈极显著正相关,与单株产量、可溶性固形物呈显著正相关;单株结果数与单株产量呈极显著正相关,与可溶性固形物呈显著正相关。利用主成分分析提取出 4 个主成分,其累积方差贡献率达 86.337%。主成分分析法筛选出综合排名前 3 的品种为釜山 88、浙樱粉、黄妃,与模糊隶属函数综合评价结果基本一致。因此,可考虑在昆山地区推广栽培釜山 88、浙樱粉、黄妃。 相似文献
2.
大豆抗旱性与生理生态指标关系的研究 总被引：10，自引：0，他引：10
以抗旱性不同的5个大豆品种为材料,采用盆栽播种,分别在花荚期正常供水与水分胁迫条件下,测定了相对含水量、相对电导率、单株荚数、单株粒数、单株粒重、分枝数等与品种抗旱性相关的生理生态指标,并用隶属函数法对材料进行抗旱性综合评价。结果表明：品种综合抗旱性强弱为晋大73>晋大53>晋大52>晋大76>晋大75。 相似文献
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中间冰草种质材料苗期耐盐性研究 总被引：1，自引：1，他引：0
于2x14年采用苗期盆栽法,对is份中间冰草种质材料进行不同浓度盐(0.0%,0.l%,0.3%,0.5%,0.7%)胁迫,通过对其存活率、相对株高、相对分桑数、相对生物量4个形态指标的测定,利用隶属函数值法综合评价巧份材料的耐盐性,并从中选出耐盐性较好和较差的材料进行细胞膜透性、丙二醛含量和过氧化物酶活性的测定与分析。试验结果表明,其存活率、相对株高、相对分粟数、相对生物量随盐浓度的升高而降低;盐浓度0.7%处理存活率、相对株高、相对分粟数、相对生物量显著低于0.1%,0.3%和0.5%处理。根据隶属函数综合评价法得知不同材料的耐盐性,耐盐性最强的材料是来自前苏联的84-371,84-377和84-366中间冰草,耐盐性最差的是来自伊朗的84-342和来自前苏联的84-273中间冰草。 相似文献
4.
通过遗传多样性指数、变异系数、相关性分析、主成分分析、聚类分析及逐步回归分析对162份苦荞种质资源的13个表型性状进行分析及评价。结果表明,5个质量性状的遗传多样性指数为0.7180～1.2826,8个数量性状的遗传多样性指数为1.3037～2.0727,变异系数为5.4%～43.4%,除生育期外其余7个农艺性状变异系数均大于10%,说明所选苦荞资源遗传变异非常丰富。相关性分析表明,主茎分枝数、主茎节数、单株粒数、单株粒重、千粒重和生育期6个性状对产量影响最大。主成分分析提取的4个主成分累计贡献率达83.559%,单株粒重、单株粒数、产量、株型、主茎分枝数和粒型等性状是造成苦荞表型变异的主要因素。聚类分析将162份苦荞种质资源聚为5类,其中类群Ⅰ的材料各农艺性状表现较为均衡,是选育苦荞优良品种（系）的理想材料。类群Ⅴ的材料具有较好的抗倒伏性与较优的性状表现,是抗倒伏亲本的较优选择。通过模糊隶属函数基于4个主成分贡献率权重构建综合评价指标,筛选出10份综合性状较优的苦荞种质资源。 相似文献
5.
谷子种子萌发对模拟干旱胁迫的响应及其耐旱性综合评价 总被引：2，自引：0，他引：2
谷子[Setaria italica(L.)Beauv]是一种优良的抗旱作物资源,在农业中具有重要的地位.但近年来,随着全球气候的变暖,水资源严重短缺,在栽培区域年降水量为250～450 mm,十年九春旱.急需选育出一些高抗旱性的材料.本研究以9个谷子材料为试材,以不同渗透势的PEG-6000溶液模拟水分胁迫条件,通过测定萌发抗旱指数和活力抗旱指数、相对发芽势、相对发芽率4个指标,研究了9个谷子材料的耐旱能力,并采用模糊隶属法用上述4个指标对9个不同材料的耐旱性进行综合评价.结果表明,9个谷子材料耐旱隶属函数总平均值范围为0.023～0.710.国08-25总平均值最高,耐旱隶属值为0.710,耐旱性最高,赤10-321总平均值最低,耐旱隶属值为0.023,耐旱性最低. 相似文献
6.
黑龙江省中东部地区主栽大豆品种产量指标筛选及评价 总被引：1，自引：0，他引：1
以黑龙江省中东部地区28个大豆主栽品种为试验材料,采用主成分分析、隶属函数分析和逐步回归分析方法,对该区域大豆产量进行综合评价及鉴定指标筛选。结果表明,通过主成分分析将10个产量相关单项指标转换为4个独立综合指标,性状累计贡献率为79.083%;通过隶属函数计算产量综合评价值（Y）,对参试品种进行产量综合评价,筛选出了产量较高的大豆品种合农71、合农85、绥农26、合农75、黑农61及合农76等;通过逐步回归分析法建立大豆产量评价数学模型,Y=0.122+0.736X1+0.465X2+0.168X3+2.527X4+0.326X5+0.289X6-0.313X8,平均估计精度为92.16%;筛选了7个核心产量评价性状,分别为主茎节数、单株荚数、单株粒数、每荚粒数、单株粒重、百粒重及4粒荚数,该模型可作为大豆育种材料产量评价及品种产量鉴定的理论依据。 相似文献
7.
为筛选出鄂东大别山区油茶优良种质资源,对位于鄂东大别山区黄冈市红安县、麻城市、蕲春县的28株油茶实生单株进行调查,测定分析不同单株的冠幅产量、单果重、果纵径、果横径、果形指数、鲜出籽率、干出籽率、种仁含油率以及脂肪酸成分等性状指标,选取冠幅产量、单果重、干出籽率、种仁含油率、油酸、亚油酸等12个主要经济性状指标进行模糊综合评价。结合油茶品种选育技术的相关标准筛选出HQ-3、MF-46和QY-105 3个油茶实生单株,其平均隶属度分别为0.82693、0.80718和0.80524,高于其他单株。通过模糊综合评价筛选出的3个油茶优良单株4年平均冠幅产量、鲜出籽率、种仁含油率、油酸、亚油酸含量等指标均达到国家标准《油茶优良品种选育技术》的要求,宜作为优良单株开发利用。 相似文献
8.
旨在了解60Co-γ射线对金荞麦变异株系叶片结构产生的辐射效应,并对不同株系的抗逆能力进行评价。通过光学显微和电镜扫描对照和变异株系叶片的形态结构,利用主成分分析和隶属函数法对叶片指标进行抗逆性的初步评价。结果表明,红茎株系叶片结构与绿茎对照相比有显著差异,红茎株系叶片厚度减小18.63%,上表皮厚度增大18.94%,栅栏组织和海绵组织分别减小26.96%、13.74%,气孔平均长度显著增大,气孔密度显著减小。红叶株系与绿茎对照叶片结构没有明显差异,但气孔平均长度显著增大,气孔密度显著减小。通过主成分分析筛选出栅栏组织厚度、下表皮气孔密度、上表皮厚度、海绵组织厚度、叶片结构紧密度5项指标作为金荞麦的抗逆性评价指标,应用隶属函数法评价抗逆性顺序为：绿茎＞红叶＞红茎。60Co-γ射线辐照对金荞麦叶片结构具有显著的辐射效应,不同变异株系的抗逆能力有差异,研究结果为金荞麦下一步选育工作提供理论依据。 相似文献
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A. A. Markov Rolling Forecast Method is presented in this paper according to the dynamic characteristics of the estate business system. Test results reveal that the system quantitative forecast could be realized on the basis of previous samples, which provide a direction of the rational management in estate business. Concerning sample molding analysis and Markov Rolling Forecast Method, this paper gives a corresponding conclusion of analytic research quantitatively in order to demonstrate the formation of factors working in estate business activities and its systematic logistic connotation. Markov Rolling Forecast Method can be applied not only to short-term prediction but long term one as well, provided when the market is rather stable with no significant change during a regular period of time and when the rolling times of the state transition matrix are fairly enough. 相似文献
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Dual-passage excitation control method based on dynamical synchronous reference frame is analysed according to the base theory of A.C. excited generator. Using the dual-CPU project basing on the high speed DSP, excitation control system of A.C. excited generator is realized. Considering the characteristic of this control system, taking full advantage of the high speed and the convenient peripherals of DSP, the hardware and software of the control system are designed appropriately. Dual-passage excitation control system is realized using the dual-CPU method. Dual-passage excitation control strategy based on dynamic synchronous reference frame is proved with the experiment. 相似文献
14.
Summary The development and timing of different processes in the floral biology and sexual reproduction of Lilium longiflorum were studied and brought together into a chronological reproductive calendar. Care must be taken when emasculating flowers later than 4 days before anthesis (DBA), because the stomium of the anther was open from 8 DBA and the pollen grains appear to be mature from 3–2 DBA. The receptivity period of the pistil lasts for a rather long period, but before wilting of an unpollinated flower as determined by a change of the colour of the perianth from white into brown, the flower had already lost its receptivity. Because L. longiflorum pollen grains can easily be stored, the pistil receptivity should thus determine the pollination schedule. The relationships between pollen tubes and pistil are discussed with respect to plant breeding.Abbreviations DAA
Days After Anthesis
- DAP
Days After Pollination
- DBA
Days Before Anthesis 相似文献
15.
Fourteen interspecific hybrids in sexual diploid Allium senescens var. minor× apomictic tetraploid Allium nutans L. crosses, and eight interspecific hybrids in sexual diploid A. senescens var. minor× apomictic hexaploid A. senescens L. crosses were produced. The number of chromosomes was 2n= 24 in interspecific hybrids of diploid × tetraploid, and 2n= 32 in diploid × hexaploid crosses. Triploid and tetraploid interspecific hybrids showed intermediate parental morphological characteristics. Tetraploid interspecific hybrids of A. senescens var. minor×A. senescens crosses formed two groups based on leaf colour and leaf width. Seeds were formed in 11 out of 14 triploid interspecific hybrids under natural conditions. In cytological observations of parthenogenesis, three out of 12 triploid interspecific hybrids and five out of eight interspecific tetraploid hybrids were observed. Parthenogenesis ranged from 26.0% to 86.0% in five tetraploid interspecific hybrids. Non-parthenogenesis to parthenogenesis segregated in a 3:5 ratio in A. senescens var. minor×A. senescens crosses. 相似文献
16.
Tomosaburo Yabuno 《Euphytica》1990,50(3):191-195
Summary Recurrent backcrossing has been carried out with a view to transfer a gene for non-glutinous endosperm from two strains of O. glaberrima (Wx
g
/Wx
g
) to glutinous japonica and indica varieties (wx/wx) of Oryza sativa. In the course of backcrosses Wx
g
/wx segregants were crossed with each of the two glutinous varieties of sativa as the respective recurrent male parent. The wx/wx and Wx
g
/wx segregants in the successive generations were consistently fully fertile and semi-sterile, respectively. The semi-sterility of Wx
g
/wx plants was attributable to abortion of most of the pollen grains carrying the gene wx. The nucleus but not cytoplasm was related to the semi-sterility. The Wx
g
/Wx plants having the gene for non-glutinous endosperm of a glaberrima strain and a japonica variety of sativa were also semi-sterile. Both wx- and Wx-megaspores in the plants heterozygous for the gene Wx
g
were deleteriously affected. The results could be explained by assuming that a factor tightly linked with the gene Wx
g
of glaberrima sterilizes gametes not carrying it in the heterozygotes and that the gametocidal action is exerted when combined with the sativa nucleus by the recurrent backcross method. 相似文献
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毛蚶、魁蚶和泥蚶核糖体DNA转录间隔区的RFLP分析 总被引：3，自引：0，他引：3
对毛蚶、魁蚶和泥蚶核糖体DNA转录间隔区(ITS区)进行限制性片段长度多态性(RFLP)分析发现,6种限制性内切酶(HaeⅢ,HhaⅠ,HpaⅡ,RsaⅠ,Sse9Ⅰ和TaqⅠ)均能将泥蚶与毛蚶及魁蚶区别开来,但未发现毛蚶和魁蚶间特异性的RFLP标记.对酶切图谱进行的数理分析结果显示,毛蚶与魁蚶之间的净遗传距离Pnet值为0,而泥蚶与毛蚶、泥蚶与魁蚶之间的Pnet值均为0.079 7;泥蚶群体内检测到5种酶切复合单倍型,核苷酸多样性指数π值为0.000 8外,而毛蚶和魁蚶群体内为相同的1种复合单倍型,π值均为0. 相似文献
19.
P. van der Valk S. E. de Vries J. T. Everink F. Verstappen J. N. de Vries 《Euphytica》1991,53(3):201-209
Summary To facilitate the introgression of desirable traits of Allium fistulosum into the genome of A. cepa, several accessions of the hybrid between these species were pollinated with A. cepa as the recurrent parent, and in vitro ovary and ovule culture were performed to obtain an increase in the recovery of backcross progeny. Compared to the results obtained from seed development in planta, the increase in the number of backcross progeny was generally very limited, and in some cases even a decrease was found. Raising the sucrose concentration in the ovary culture medium resulted in a higher frequency of ovules developing back seed coats but this was not followed by an increase in the number of backcross progeny obtained. Pollen tube growth of A. cepa was disturbed in the styles of the interspecific hybrids. Per ovule, frequencies of micropylar penetration exceeded frequencies of backcross progeny only to a limited extent. Hence, it was concluded that in the tested interspecific hybrid accessions the attainable gain in viable backcross progeny by the application of in vitro culture techniques is limited by strong pre-fertilization barriers acting at the level of stylar incongruity. 相似文献
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自新疆古尔班通古特沙漠采集了紫翅猪毛菜(Salsola affinis C.A.Mey.)种子,实验室内进行了萌发生态适应性的研究,探讨不同浓度(0、0.2、0.4、0.6、0.8、1.0 mol/L)的NaCl溶液和不同温度(5、15、25、35℃)处理对紫翅猪毛菜种子萌发的影响,并将盐胁迫下未萌发种子转移至蒸馏水中,观察其在盐胁迫解除后的恢复情况。结果表明:种子萌发的最适温度为25℃,浓度低于0.2 mol/L的NaCl溶液对萌发的影响不大;随NaCl浓度增高紫翅猪毛菜种子萌发率降低。在25℃时,种子耐盐临界值为0.501 mol/L;极限值为1.009 mol/L。将在盐溶液中处理9 d的种子转移至蒸馏水后,原来较高浓度下的种子具有较高的萌发恢复率,表明一定程度盐分胁迫不影响种子萌发潜力,其萌发恢复率随原处理溶液抑制程度的增加而增加,且发芽速度和整齐度提高。讨论了紫翅猪毛菜种子萌发特性与生态环境的关系。 相似文献