The results showed that compared with soil culture, the root cap was not obvious with less amyloplast and polysaccharose substance under water culture. The root epidermis under water culture was thinner than that of soil culture, with little root hair or not, in which cortex parenchyma tissue developed with big cell, solution proliferative aerenchyma in intercellular space, and thin cell wall. However, the root cap under soil culture was big, with strong PAS reaction and no aerenchyma tissue.

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

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New cells are cut off on the lower side to form new stem tissue at the stem apex, and on both sides in the root apex to form root tissue and a protective root cap.

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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.

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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.

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Although both of FDRMADS7 and FDRMADS8 wereexpressed in the root, they have different expression pattern.The transcripts of FDRMADS7 weredetected throughout the root,especially the expression in the root meristem was the highest.However,the expression of FDRMADS8 was mainly localized in elongation and mature rigion.No apparent expression signal was detected in the root cap, root meristem and pericycle cells.

雖然FDRMADS7和FDRMADS8都在根中表達日韩乱码无码中文视频，但它們在根中的表達模式也不相同：FDRMADS7在根中到處表達，尤以生長點處表達量最高国内精品国产免费观看一级A片；而FDRMADS8在伸長區(qū)和根毛區(qū)的皮層中有大量表達国产AV无码宅吉看久久久久久，在根冠漂亮人妻18P，根尖分生區(qū)和根毛區(qū)的中柱鞘細胞中卻無明顯表達野狼社区精品，暗示它們在根中行使的功能也不相同。

Excied root apex explants of seedlings from Mormodes Jumbo Odin × Catasetum expensum were induced to from PLBs in MS medium supplemented with BA (0.5 mg/l ). Histological observations confirmed that root cap were disorganized at early stage and followed by vascular strand of existing roots protruding into PLBs formation.

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

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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.

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Observations from the paraffin dissection showed that, the anatomical structures of treated upland rice root tip cells changed obviously, such as the arrangement confusion of cells from apical root meristem, quiescent center and root cap, increased middle lamella, the increased width and reduced elongation of cortex parenchyma cells, and the large numbers of slough off epidermis cells.

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