根冠

A layer of cells derived from the venter of the archegonium that covers the developing sporophyte.

帽状体：1。根冠：位于根尖的最前端，像帽子一样套在分生区外面，保护其内幼嫩的分生组织细胞。

The result showed that the biomass, plant height, dry weigh, carnification, K(superscript +) content and K(superscript +)/Na(superscript +) ratios of I. lactea var. chinensis decreased with increasing NaCl stress, while root/shoot ratios and Na(superscript +) content increased. The water content and carnification degree of roots in all treatments were higher than shoots, which, however, was not significantly related to salt concentration.

试验结果表明：在NaCl胁迫下，随著胁迫浓度的增加，马蔺生物量、株高、干重、肉质化以及K含量、K/Na比值降低，同时根冠比、Na含量增加：各盐处理区根系含水量和肉质化程度大於茎叶，但与盐浓度的相关性不大。

The results showed that Hyphae, conidiophore, conidium and chlamydospore of biocontrol strains ZK7 and IPC were found in the rhizoplane, Hyphae of ZK7 and IPC penetrated epidermal cells to deep cortical cells but not in phloem tissue and xylem vessels, biocontrol strains ZK7 and IPC also crossed and even grew within epidermal and conical cell walls without any visible alterations of the plant cell.

生防菌ZK7和IPC菌株能以菌丝方式稳定定殖于烟草根表的根冠区、伸长区、根毛区、成熟区等不同部位，而在根内的定殖仅局限于根表皮层较深的细胞组织，不能侵入烟草根部的韧皮部和木质部组织。

Both root and root cap are covered by a sheath-like structure called the coleorhiza.

根和根冠被一鞘状结构，即胚根鞘所覆盖。

Hairy roots were induced from tobacco leaves with Agrobacterium rhizogenes LBA1334 harboring agropin type PRil855 and binary vector PIG121HM carrying a kanamycin resistant gene nptll and GUS gene and the good hairy root clones were selected. The root with many root hairs and branches grew vigorously toward all the direction on MS medium without plant hormone and on kanamyain containing medium (km:30mg/L). The structure of the hairy root tip is different from that of ordinary root. Witch was not typical root cap maybe the main cause of losing the geotropism of hairy root. Plantlet regenerated from hairy root when cultured on Ms medium without plant hormone. The nicotine content of the hairy root was little higher than that in the natural roots.

本研究通过发根农杆菌工程菌LBA1334(含有野生型pRi1855质粒和pIG121HM双元载体质粒，编码NPTⅡ基因和GUS基因)转化烟草沙姆逊，获得了具有卡那霉素抗性烟草发状根，并筛选出良好的单克隆株系，该发状根具有典型的发状根特性(多根毛、多分支、在无激素培养基上快速生长)，通过根尖压片分析，烟草发状根不具备典型的根冠；发状根中烟碱含量1.61％稍高于与天然栽培品种母体根的含量(1.5％左右)，发状根向培养液中释放烟碱，释放量最多时占总烟碱量的81.1％；在无激素的培养基上获得了再生植株。

In roots, however, the concept is still applied, and in some angiosperm roots a fourth histogen zone is recognized, the calpytrogen, which gives rise to the root cap.

然而在根中，它还是适用的。在一些被子植物的根中，还发现了第四种组织原，即 calpytrogen ，与根冠发生有关。

This artical summarized the research progress on hydrotropism of plant root system internationally from three aspects such as,how to induce hydrotropism by roots, root cap is the site of apperceiving humidity gradient,and the research on hydrotropism at the molecular level.

主要从根部如何诱导向水性、根冠是感知度梯度部位及在分子水平对向水性研究3个方面，总结了国际上植物根系向水性研究的进展。

Root border cells, previously referred to as sloughed root cap cells, is a special cell population which separates in large numbers from the periphery of the root cap and accumulates in the root tip.

潘建伟 ，朱睦元，彭华正，王利琳植物根边缘细胞是从根冠表皮游离出来并聚集在根尖周围的一群特殊细胞，以前曾称为根冠脱落细胞。

Under P-deficiency stress, IAA concentration in asparagus bean plant increased, and IAA translocated from shoot to root, then IAA concentration in root increased, and the ratio of IAA concentration in root/that in young stem and leaf increased, then the ratio of root/shoot increased, due to more carbohydrate translocated to root.

缺磷胁迫下长豇豆幼苗IAA浓度升高，并从地上部向根系运转，使根系IAA浓度和根系IAA含量/嫩茎叶IAA含量的比值升高，增强了碳水化合物向根分配的力度，促进了根冠比的提高，对缺磷敏感的二芦白升高最大，因而根冠比也升高最大。

Tion at two-leaf stage,and morphological indexes and physiological indexes of Plug seedlings were measuredand analyzed after treatment.The results indicated that all the treatments did positive effects for improving theseedlings quality compared to control whether in summer or in autumn,and treatment of 200 mg/kg CCC wassignificantly increased in root-shoot ratio,seedling index,root activity,soluble protein and decreased in height,compared to control in summer,while treatment of 100 mg/kg CCC+0.1mg/kg BR was significantly increasedin root-shoot ratio,seedling index,chlorophyll,soluble sugar and decreased in height compared to control inautumn.

结果表明：夏季各处理与对照相比均有不同程度的壮苗效果，其中单独施用200mg/kg CCC的秧苗效果最好，与对照相比，株高显著下降，根冠比增加，壮苗指数显著升高，G值提高，根系活力增大，叶绿素显著增加，可溶性糖显著提高；秋季各处理也均利于提高秧苗质量，其中施用100mg/kg CCC+0.1mg/kg BR的秧苗壮苗效果最好，与对照相比，株高显著降低，根冠比显著增大，壮苗指数上升，G值显著增加，根系活力增大，叶绿素总量和可溶性糖都显著增加，可溶性蛋白有所下降。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。