根系

In recent years,with the study in aboveground vegetation part in depth,research on the roots becomes more and more attention and concern.Therefore,a number of new researches on roots is carried out.

近年来随着对地上部分研究的深入，同时对根系的研究日益受到重视和关注，因而根系的研究在多个新的研究方向上展开。

The results show that soil-root complex still comply with Coulombs law; root-soil complex cohesion and the incremen in the unit soil content directly proportional relationship, and the root system anchoring role formula is established based on this; Different distribution methods in root has different impact on the shear strength of composite material.

结果表明，根土复合体仍然符合库伦定律；根土复合体粘聚力的增量与单位土体中根系的含量成正比关系，在此基础上建立了根系锚固作用公式；根系不同的分布方式对根土复合体的抗剪强度有不同影响。

Discovered cycads'root system is fibrous root system,it is not taproot sysem which was widely thought in former times.

发现苏铁类植物根系为须根系。而过去均认为苏铁类植物为直根系。6。

From studying correlation with roots of ephemerals and factors of environment, the results showed: the most roots of ephemerals don t site so deep under ground and April is the most important period for growing of roots.

对早春短命植物根系和立地条件的研究表明：早春短命植物的根系大都分布在土壤浅层；4月份是其根系发育的主要阶段。

The mechanisms for the differences among rice cultivars in Cd uptake and translocation There were significant differences in root oxidating abilities and soil redox potential between two typical rice cultivars, Shan you 63 and Wu yun jing 7, that are greatly different in Cd uptake from soil. The root oxidating abilities and soil Eh were accordant with Cd uptake for the cultivars. The difference between the two cultivars in Fe concentrations of root iron plaque was also significant. The cultivar with higher Fe concentrations in root iron plaque absorbed less Cd from soil.

四、水稻不同品种对镉吸收及分配存在差异的生理机理对土壤中Cd吸收能力差异很大的水稻不同品种间，根系氧化力和土壤氧化还原电位有显著差异，品种的根系氧化力和土壤氧化还原电位与该品种对Cd的吸收能力间有很好的一致性；水稻不同品种间，根表铁氧化膜的含铁量有显著差异，根表铁氧化膜含铁量高的品种，对土壤中Cd的吸收能力低；盆栽水分腾发量高及根系伤流液Cd浓度高的品种，吸收积累Cd的能力强。

In comprehensive concerning of all above,it is suggested that theincrease of zinc content in shoot apex may involved in IAA synthesis in thispart,which is more likely to be an orignal signal that plays a critical role inthe regulation of root ferric reductase activity of iron-deficientdicotyledonous plants.

综上所述，缺铁胁迫条件下，根系铁含量的降低导致根系锌含量的积累，从而使茎尖的锌含量增加并有可能促进地上部IAA的增加。在双子叶植物中，IAA可能是调节缺铁根系〓还原酶活性的初始信号物质。

This paper introduced the advances of research in roots recently,it included physiology,molecular and cell biology of root systems with th...

简要介绍了国内外近年来在根系生理与分子生物学，根系细胞生物学以及研究方法方面的研究进展，以供根系研究参考。

Compared with development stage at the fortith day, total exudation rates of amino acids and organic acids in common genotype at the fifith day decreased sharply, while it kept rather stationary in potassium-rich genotype; At three growth phrases, tyrosine, serine and y-amidobutyricacid were dominant amino acids in root exudates of those two genotypes, malic acid was dominant organic acids, and the proportision of malic acid to total exudation increased with the prolongation of growth phase prolonged.

在3个生长期内，酪氨酸、γ-氨基丁酸和丝氨酸均为两类基因型根系分泌物中的主要氨基酸种类，苹果酸则是主要的有机酸类型，其在氨基酸和有机酸分泌总量中所占相对比例均随生长期的延长而升高。3籽粒苋根系分泌物处理后的土壤速效钾含量均高于清水对照处理，富钾基因型在低钾胁迫时的根系分泌物对土壤钾的活化作用明显大于一般基因型。

Compared with development stage at the fortith day, total exudation rates of amino acids and organic acids in common genotype at the fifith day decreased sharply, while it kept rather stationary in potassium-rich genotype; At three growth phrases, tyrosine, serine and γ-amidobutyricacid were dominant amino acids in root exudates of those two genotypes, malic acid was dominant organic acids, and the proportision of malic acid to total exudation increased with the prolongation of growth phase prolonged.

在3个生长期内，酪氨酸、γ-氨基丁酸和丝氨酸均为两类基因型根系分泌物中的主要氨基酸种类，苹果酸则是主要的有机酸类型，其在氨基酸和有机酸分泌总量中所占相对比例均随生长期的延长而升高。3籽粒苋根系分泌物处理后的土壤速效钾含量均高于清水对照处理，富钾基因型在低钾胁迫时的根系分泌物对土壤钾的活化作用明显大于一般基因型。

These parameters did not differ from each other in figleaf gourd"s two treatments. The root temperature of 14℃didn"t induce significant changes in the total respiration rate in both species but caused an increase of the alternative respiration pathway and a decrease of the cytochrome respiration pathway, and more dead cells in root tips in cold-sensitive cucumber roots.

低温条件下，黄瓜的生长明显差于黑籽南瓜，同时根系表现出更高的超氧化物阴离子O_2~(·-产生速率、过氧化氢(H_2O_2)与膜脂过氧化产物丙二醛含量以及抗氧化酶活性。14℃根温并未引起两种作物根系的总呼吸速率发生变化，但却引起黄瓜根系的交替途径呼吸速率与细胞色素途径呼吸速率的显著变化，表现为低温下Valt的上调而Vcyt的下降。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。