There was lots of organelle, such as rib somes, mitochondria in companion cell during the mature stage of SE. Also the plasmodesmata appeared in cell wall between SE and CC.

在篩管成熟期間又大又黄色视频日逼视频免费，伴胞的細胞質(zhì)較濃国产办公室里玩秘书在线观看，內(nèi)含辜富的核糖核蛋白體、線粒體等細胞器欧美特黄AAAAA片，與篩管相連的細胞壁上具有胞間連絲久久亚洲成a人片。

Companion cell An elongated thinwalled cell cut off longitudinally from the same meristematic cell as the SIEVE ELEMENT with which it is closely associated.

伴胞：與篩管分子側(cè)面相鄰的一種細胞，和篩管間有密集胞間連絲日韩欧美一卡二卡，它與篩管是由分生組織的同一個母細胞不均等分裂發(fā)育而成欧美亚洲中文日韩。

Subcellular localization of ATPase activity in the flesh of developing apple fruit was carried outusing a lead phosphate precipitation technique via electron-microscope. The ultrastrcture of phloemand its surrounding cells was also observed. The results showed that ATPase activity wasdominantly localized on the plasma membranes of sieve element/companion cell complex.

應(yīng)用鉛沉淀的細胞化學方法，研究了發(fā)育過程中蘋果果肉內(nèi)卸載區(qū)(韌皮部及其周圍薄壁細胞)ATP酶的亞細胞分布和變化AV美女激情在线，并且免费毛片的网站上，作為補充，觀察了韌皮部及其周圍薄壁細胞的超微結(jié)構(gòu)国产AV无码宅吉看久久久久久。

The results displayed the symplasmic isolation of sieve element/companion cell complex from the surrounding parenchyma cells, and suggest that the photoassimilate unloading from phloem follows an apoplasmic pathway and must be facilitated via the sugar transporters.

由此可見国产午夜一级毛片，蘋果果實韌皮部組織同周圍薄壁組織存在共質(zhì)體隔離，同化物必須通過糖轉(zhuǎn)運蛋白的介導從篩分子以跨越質(zhì)膜的方式卸出到質(zhì)外空間野狼社区精品，然后再裝載到周圍薄壁細胞中4444网址。

The ultrastructural changes during the development of sieve element companion cell complex (SE/CC complex) in Populus deltoides were investigated using electronic microscopy. The result showed that SE and CC tome from the same secondary phloem mother cell. The development of sieve element went through three stages, i. e. immature, mature, and degenerate stage. In immature stages the sieve element presented radial expansion, cell wall thickening, and production of sieve plastid and P-protein. The cytoplasma selectivly autolysed in mature stage. At the same time, karyoplasm was dispersed, and nuclear envelope was not clear, or karyoplasm was disorgnized, and nuclear envelope was clear. The karyopalsm finally turned into P-protein. In degenerate stage, the cytoplasm completely disappeared, and the function was lost.

利用電鏡技術(shù)研究美洲黑楊次生韌皮部篩管和伴胞發(fā)育過程中細胞超微結(jié)構(gòu)的動態(tài)變化，觀察到篩管和伴胞由同一個次生韌皮部衍生細胞分裂分化形成篩管約發(fā)育歷經(jīng)未成熟期国产在线不卡免费AV网站、成熟期和衰退期的變化未成熟期篩管分子表現(xiàn)為細胞的徑向擴展欧美最近激情性高潮、壁的增厚欧美日韩一区二区网站、篩管質(zhì)體和P-蛋白質(zhì)的產(chǎn)生；成熟期篩管分子細胞組分發(fā)生選擇性自溶欧美操逼黄色网占，細胞核核質(zhì)彌散狀国产按摩全黄A一级毛片视频，核膜不清晰欧美性一级A片，或核膜清晰而核物質(zhì)降解又爽又紧又湿A级视频，最后細胞核完全解體轉(zhuǎn)化為P-蛋白質(zhì)類的物質(zhì)；衰退期篩管分子細胞質(zhì)完全解體消失操逼免费a级视频，失去功能久久亚洲精品女人黄。

companion cell：伴胞

脫分化3.篩管(sieve tube)和伴胞(companion cell):篩管分子在發(fā)育早期階段,細胞中有細胞核精品黄色网站一级、濃厚的細胞質(zhì)www.日韩三级在线、線粒體、高爾基體日韩校园激情无码视频、內(nèi)質(zhì)網(wǎng)日韩老司机免费午夜电影院、粘液體等細胞器存在.

companion cell：伴細胞

communicable disease 傳染病 | companion cell 伴細胞 | comparative anatomy 比較解剖學

companion cell：伴細胞,伴胞

compact bone 密質(zhì)骨 | companion cell 伴細胞,伴胞 | compatibility 相容性,親和性