The leaf anatomic structure of %Zizyphus jujuba% var. %spinosa% from seashore to western arid area (near 37° N latitude) of China were investigated with both a light microscope and a scanning electron microscope....The leaf anatomic structure of %Zizyphus jujuba% var. %spinosa% from seashore to western arid area (near 37° N latitude) of China were investigated with both a light microscope and a scanning electron microscope. The results showed that all provenances shared the following common features. The distribution of stomata was generally uniform on the abaxial surface, and the type of stomatal apparatus was mainly anomocytic. The upper epidermis was formed by one layer of cells with tight, regular arrangement, and the lower epidermis was also formed by one layer of cells, and the type of anticlinal cell wall on both the upper and on the lower epidermis was straight. In the contrast, there were some differences in the anatomic characteristics among the provenances. With the decrease of water content in the habitats, (1) the stomatas became smaller gradually, and the density of stomata increase gradually; (2) the cells of both the upper and the lower epidermis became smaller gradually; (3) thickness of the upper and the lower cuticle, as well as the thickness of leaf, increased gradually; (4) bifacial leaf changed to isobilateral leaf; (5) the proportion of palisade tissue increased gradually, whereas the spongy tissue decreased; (6) diameter of midrib vessels and of midrib vascular bundles increased gradually; (7) the epidermis ornament changed in an order of smoothness, strip, reticulation, and mountain-like that represented the leaf structural characteristics of xerophytes. The results also showed that the sequence of the drought resistance delicacy was thickness of upper cuticle>density of stomata in proximal surface, size of stomata in proximal surface (length/width), thickness of lower cuticle, thickness of palisade, and thickness of spongy>average length of stomata, average length/width of upper epidermis cells, thickness of leaf, value of CTR, thickness of upper epiderm cell, thickness of lower epidermic cell, layers of palisade>diameter of midrib vascular bundle, average width of stomata, the area of stomata in 展开更多
为了探讨枣与酸枣资源的遗传多样性以及两者的亲缘关系，采用7对 SSR 引物，对16份枣品种（系）和17份酸枣的遗传多样性进行分析。结果表明：16份枣样品共扩增出56个等位基因，有效等位基因数（ Ne）为3.798~10.000，平均为6.953，Shan...为了探讨枣与酸枣资源的遗传多样性以及两者的亲缘关系，采用7对 SSR 引物，对16份枣品种（系）和17份酸枣的遗传多样性进行分析。结果表明：16份枣样品共扩增出56个等位基因，有效等位基因数（ Ne）为3.798~10.000，平均为6.953，Shannon′s信息指数（I）为1.984，期望杂合度（He）为0.837；17份酸枣样品扩增后共检测出73个等位基因，等位基因的有效数目（Ne）为3.273~11.840，平均为7.398，Shannon′s信息指数（I）为2.105，期望杂合度（He）为0.843；枣和酸枣的遗传多样性都很丰富，酸枣的遗传多样性水平高于枣；GenAlEx分析得出，枣和酸枣居群种间遗传分化系数（Fst）为0.055，居群种间基因流（Nm）平均值为4.295，说明居群间基因交流比较频繁。NTSYSpc 聚类分析表明，SSR分子标记可以将枣和酸枣划分为枣类、酸枣类和过渡类3个类群。展开更多
酸枣(Ziziphus jujuba Mill.var.spinosa(Bunge)Hu ex H.F.Chow)为鼠李科枣属植物,主要分布于我国华北陕、晋、冀、鲁、豫五省,由于野生生长条件的差异性及其他因素影响,酸枣果实形态有所变异,种质资源多样性也越来越丰富。为了解我国...酸枣(Ziziphus jujuba Mill.var.spinosa(Bunge)Hu ex H.F.Chow)为鼠李科枣属植物,主要分布于我国华北陕、晋、冀、鲁、豫五省,由于野生生长条件的差异性及其他因素影响,酸枣果实形态有所变异,种质资源多样性也越来越丰富。为了解我国酸枣资源的整体分布、资源的多样性等方面的情况,查阅近20年来的国内外文献,发现目前对酸枣的研究多集中于化学成分、药理作用等方面,关于种质资源方面的研究较少,酸枣长期的野生生长及采收、加工、贮藏等因素在一定程度上影响到药材酸枣仁的质量。本文从有关酸枣的分布情况,资源多样性,化学成分等方面进行归纳总结,以期为酸枣的种质资源保护及资源的研究开发提供参考。展开更多
文摘The leaf anatomic structure of %Zizyphus jujuba% var. %spinosa% from seashore to western arid area (near 37° N latitude) of China were investigated with both a light microscope and a scanning electron microscope. The results showed that all provenances shared the following common features. The distribution of stomata was generally uniform on the abaxial surface, and the type of stomatal apparatus was mainly anomocytic. The upper epidermis was formed by one layer of cells with tight, regular arrangement, and the lower epidermis was also formed by one layer of cells, and the type of anticlinal cell wall on both the upper and on the lower epidermis was straight. In the contrast, there were some differences in the anatomic characteristics among the provenances. With the decrease of water content in the habitats, (1) the stomatas became smaller gradually, and the density of stomata increase gradually; (2) the cells of both the upper and the lower epidermis became smaller gradually; (3) thickness of the upper and the lower cuticle, as well as the thickness of leaf, increased gradually; (4) bifacial leaf changed to isobilateral leaf; (5) the proportion of palisade tissue increased gradually, whereas the spongy tissue decreased; (6) diameter of midrib vessels and of midrib vascular bundles increased gradually; (7) the epidermis ornament changed in an order of smoothness, strip, reticulation, and mountain-like that represented the leaf structural characteristics of xerophytes. The results also showed that the sequence of the drought resistance delicacy was thickness of upper cuticle>density of stomata in proximal surface, size of stomata in proximal surface (length/width), thickness of lower cuticle, thickness of palisade, and thickness of spongy>average length of stomata, average length/width of upper epidermis cells, thickness of leaf, value of CTR, thickness of upper epiderm cell, thickness of lower epidermic cell, layers of palisade>diameter of midrib vascular bundle, average width of stomata, the area of stomata in
文摘为了探讨枣与酸枣资源的遗传多样性以及两者的亲缘关系，采用7对 SSR 引物，对16份枣品种（系）和17份酸枣的遗传多样性进行分析。结果表明：16份枣样品共扩增出56个等位基因，有效等位基因数（ Ne）为3.798~10.000，平均为6.953，Shannon′s信息指数（I）为1.984，期望杂合度（He）为0.837；17份酸枣样品扩增后共检测出73个等位基因，等位基因的有效数目（Ne）为3.273~11.840，平均为7.398，Shannon′s信息指数（I）为2.105，期望杂合度（He）为0.843；枣和酸枣的遗传多样性都很丰富，酸枣的遗传多样性水平高于枣；GenAlEx分析得出，枣和酸枣居群种间遗传分化系数（Fst）为0.055，居群种间基因流（Nm）平均值为4.295，说明居群间基因交流比较频繁。NTSYSpc 聚类分析表明，SSR分子标记可以将枣和酸枣划分为枣类、酸枣类和过渡类3个类群。
文摘酸枣(Ziziphus jujuba Mill.var.spinosa(Bunge)Hu ex H.F.Chow)为鼠李科枣属植物,主要分布于我国华北陕、晋、冀、鲁、豫五省,由于野生生长条件的差异性及其他因素影响,酸枣果实形态有所变异,种质资源多样性也越来越丰富。为了解我国酸枣资源的整体分布、资源的多样性等方面的情况,查阅近20年来的国内外文献,发现目前对酸枣的研究多集中于化学成分、药理作用等方面,关于种质资源方面的研究较少,酸枣长期的野生生长及采收、加工、贮藏等因素在一定程度上影响到药材酸枣仁的质量。本文从有关酸枣的分布情况,资源多样性,化学成分等方面进行归纳总结,以期为酸枣的种质资源保护及资源的研究开发提供参考。
