共查询到19条相似文献,搜索用时 218 毫秒
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《北方水稻》2021,51(3)
以170份辽宁省审定水稻品种资源的12个品质性状为基础数据,分析其多样性水平,构建核心样本群体,并通过平均性状极差符合率(CR)、变异系数变化率(VR)、多样性指数率(H)3个参数对核心样本群体进行评价。结果表明,170份水稻品种12个品质性状变异系数在1.18%~100%,多样性指数在0.693~2.097。构建由42份水稻品种构成的核心样本群体,其平均性状极差符合率、变异系数变化率、多样性指数率分别为86.04%、109.31%、100.75%,可以较好的代表全部种质的表型多样性。同时对核心样本群体主坐标及方差分析表明,42个核心样本形成5个品质性状有明显差异的性状类群,为核心样本利用指明了方向。 相似文献
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为了解辽宁省水稻品种品质性状现状,对近年来审定的142份水稻品种进行品质性状分析。结果表明,12个品质性状中垩白性状、透明度的变异程度较大,直链淀粉、糙米率、精米率、蛋白质、胶稠度、粒长多样性较高。在12个品质性状中加工因子、粒型因子、垩白因子、理化因子、透明因子是影响辽宁省水稻品种品质性状综合表现的主要因子,也是品种群体类型划分的主要依据。相关分析表明,12个品质性状间存在着或正向、或负向的显著、极显著相关,并构建2个综合选择指数模型。 相似文献
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以2010年辽宁省盐碱地研究所试验点省区试中晚熟组部分水稻品种为试材,测定稻米品质及水稻群体光合速率,结果表明:水稻品种间稻米品质及群体光合速率均存在差异,齐穗后14 d左右时水稻群体光合速率与稻米的垩白粒率、垩白度呈显著或极显著正相关。 相似文献
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辽宁省稻米品质性状的现状及相关性分析 总被引:2,自引:0,他引:2
以近年来辽宁省审定的61个水稻品种为试材,对品质性状的现状及性状间的相关进行了分析。结果显示,辽宁省水稻品种间品质性状差异较大,主要体现在外观、营养、蒸煮品质的部分性状上,加工品质性状制约了品质性状的进一步提升。在性状的关系上,外观品质与蒸煮品质优质性状结合能力较强,透明度与垩白粒率优良性状的结合能力相对好。在全部品质性状中精米率、整精米率、粒长、籽粒长宽比、垩白粒率、垩白度、透明度、直链淀粉、碱消值是影响稻米品质表现的主要性状,在部分品质性状间存在着显著或极显著相关,为品质性状的间接选择提供了依据。 相似文献
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云南地方稻种的多样性及优异种质研究 总被引:58,自引:4,他引:58
以5285余份云南地方稻种资源为研究对象进行云南地方稻种的多样性及优异种质研究。结果表明:(1)云南是中国稻种最大的遗传和生态多样性中心及其天然宝库,不仅性状间多样性存在较大差异,更重要的是地州间的多样性差异也十分明显,云南稻种资源的多样性大致可划分为多样性中心区、多样性扩散区和多样性贫乏区。(2)云南是中国稻种优异种质的富集中心, 云南地方稻种是开展中国稻种资源核心种质研究的最佳材料。(3)以云南地方稻种为研究对象开展云南稻种核心种质库的构建工作,不仅可以构建理想的核心种质库,而且可以明确核心种质的系统发生规律和建立优异核心种质动态基因库 相似文献
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Florence Esnault Roland Pellé Jean-Paul Dantec Aurélie Bérard Marie-Christine Le Paslier Jean-Eric Chauvin 《Potato Research》2016,59(4):329-343
This study presents the development of a core collection capturing the genetic diversity of a collection of 350 tetraploid cultivated potato varieties (Solanum tuberosum L.). The core collection was established by using simple sequence repeats (SSR) data and the M strategy, which aims at maximizing the allelic diversity. A 48-core collection was defined which captured 99.5% of the SSR alleles used to establish it, and 96.9% of the SSR alleles which belonged to an independent set of markers. The defined core collection was further validated by analysing 35 agro-morphological traits. The class coverage value and the estimates of the Shannon-Weaver diversity index indicated a good representation of the phenotypic diversity in the core collection. Furthermore, the core set included accessions having the most desirable status for several agronomic traits. A linkage disequilibrium (LD) analysis, using data obtained with the SolCAP SNP array on the defined core collection, was performed. The population structure analysis showed that the core collection did not present a clear genetic structure. The linkage disequilibrium analysis carried out between markers located on the same pseudomolecule within 10,000 bp concluded that 41.3% of these pairs of SNP markers have a significant LD. We conclude that this core collection, representative of the genetic diversity of cultivated potato varieties, is a relevant tool for a first screening for genetic variation regarding novel traits of interest. 相似文献
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利用基因型值构建水稻核心种质的方法研究 总被引:5,自引:1,他引:4
以992份水稻品种为材料,通过13个性状的测定和评价,进行水稻核心种质的构建方法研究。采用调整无偏预测法(AUP)无偏预测水稻性状的基因型值,用基因型值计算不同遗传材料间的马氏距离,分别用3种聚类方法(最长距离法、不加权类平均以及离差平方和)结合随机取样法、优先取样和变异度取样3种抽样方法构建出9个不同的水稻核心种质。水稻核心种质和原种质资源群体的方差差异百分率、均值差异百分率、极差符合率和变异系数变化率的比较结果表明,采用不加权类平均法进行多次聚类、结合变异度取样的方法可以较好地构建出水稻核心种质。基于基因型值构建的水稻核心种质比利用表现型值构建的核心种质更能代表原种质资源群体的遗传多样性。 相似文献
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针对哈尔滨地区种植的不同熟期、不同穗型的水稻品种进行生育期调查和植株测定。结果表明:黑龙江省水稻品种(系)生育期越晚穗粒数越多,在哈尔滨地区种植水稻随着生育期增加产量呈先增后减的趋势,生育期在9月15日左右成熟,即8月2日左右抽穗的水稻产量最高。 相似文献
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水稻粒宽基因GS5的功能标记开发和单倍型鉴定 总被引:1,自引:1,他引:0
水稻粒宽是影响籽粒粒形的重要因素之一,也是一个与水稻产量和稻米品质密切相关的重要性状。在基因GS5序列分析的基础上,对该基因第2外显子的ACC/CTA和第9外显子A/C的两个变异位点分别开发了功能标记,并将其用于294份水稻微核心种质和2007-2013年江苏省审定的65份粳稻品种的基因型鉴定。研究结果表明,这两个变异位点的等位变异在水稻籽粒的粒长、粒宽和长宽比性状上存在显著或极显著的差异;其在水稻微核心种质中组成的4种单倍型在水稻籼亚种的粒宽、粒厚和长宽比性状上存在极显著的差异,在粳亚种的粒宽和长宽比性状上存在极显著的差异;而江苏省审定的粳稻品种中仅发现Hap1和Hap2两种单倍型,其分别有64个和1个代表性品种。这些研究结果为水稻产量和稻米品质育种中充分利用GS5的优异等位基因或单倍型奠定了基础。 相似文献
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Agronomic characteristics, grain quality and flour rheology of 372 bread wheats in a worldwide core collection 总被引:2,自引:1,他引:1
J. Bordes G. Branlard F.X. Oury G. Charmet F. Balfourier 《Journal of Cereal Science》2008,48(3):569-579
A core collection of 372 accessions representative of worldwide hexaploid bread wheat diversity [Balfourier, F., Roussel, V., Strelchenko, P., Exbrayat-Vinson, F., Sourdille, P., Boutet, G., Koenig, J., Ravel, C., Mitrofanova, O., Beckert, M., Charmet, G., 2007. A worldwide bread wheat core collection arrayed in a 384-well plate. Theoretical and Applied Genetics 114, 1265–1275] was used to evaluate the available genetic diversity of agronomic and quality characteristics. The traits assessed during the vegetative period were date of ear-emergence, date of flowering, lodging, disease susceptibility and pre-harvest sprouting. Thousand kernel weight, test weight, grain hardness, grain protein content, pentosan viscosity and grain colour were also measured. The rheological properties of the derived white flours were estimated using mixograph and alveograph tests. For most of the traits, a wide phenotypic variation was observed across all the accessions. Several parameters (mixograph width parameters before and after peak time, alveograph dough tenacity and extensibility, near infrared measurements, like those for protein content, and absorbance measurements of palmitic acid and linoleic acid content) made it easier to discriminate between the cultivars. The largest ranges of variation were found in landraces and old cultivars rather than in more recent varieties. This is evidence that there is sufficient variability available for rare alleles, which have been eliminated in breeding modern varieties to be detected. Such a core collection will therefore be a useful resource for future genetic studies on wheat quality. 相似文献
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《Journal of Cereal Science》2009,49(3):569-579
A core collection of 372 accessions representative of worldwide hexaploid bread wheat diversity [Balfourier, F., Roussel, V., Strelchenko, P., Exbrayat-Vinson, F., Sourdille, P., Boutet, G., Koenig, J., Ravel, C., Mitrofanova, O., Beckert, M., Charmet, G., 2007. A worldwide bread wheat core collection arrayed in a 384-well plate. Theoretical and Applied Genetics 114, 1265–1275] was used to evaluate the available genetic diversity of agronomic and quality characteristics. The traits assessed during the vegetative period were date of ear-emergence, date of flowering, lodging, disease susceptibility and pre-harvest sprouting. Thousand kernel weight, test weight, grain hardness, grain protein content, pentosan viscosity and grain colour were also measured. The rheological properties of the derived white flours were estimated using mixograph and alveograph tests. For most of the traits, a wide phenotypic variation was observed across all the accessions. Several parameters (mixograph width parameters before and after peak time, alveograph dough tenacity and extensibility, near infrared measurements, like those for protein content, and absorbance measurements of palmitic acid and linoleic acid content) made it easier to discriminate between the cultivars. The largest ranges of variation were found in landraces and old cultivars rather than in more recent varieties. This is evidence that there is sufficient variability available for rare alleles, which have been eliminated in breeding modern varieties to be detected. Such a core collection will therefore be a useful resource for future genetic studies on wheat quality. 相似文献