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parenchyma cells 薄壁細胞。

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H2o2 was cytochemically detected in the cells of epidermal hair and the cell wall of vascular parenchyma cell . cat and apx were the two major h2o2 - scavenging enzymes in plants . when seedlings of arabidopsis thaliana were treated by vd - toxin , the activity of cat and cat3 mrna level were decreased after sa treatment 外源sa 、 no供體處理擬南芥幼苗均能誘導h _ 2o _ 2的積累, no供體的誘導作用最強; no合酶抑制劑處理則未表現出h _ 2o _ 2含量的增強: h _ 2o _ 2的積累部位主要在葉片的表皮毛和維管束組織。

1 water threatening - resistant characteristic : for instance , the outside tangency wall of epidermis cell prominently thicken ; the outside of epidermis cell are obviously covered by cuticle ; few stomats exists ; stomats are sunken ; and it has stmatic chamber structure , big aqueous tissues - parenchyma cell , mucilage cell , abnormal vascular , and soon 抗水分脅迫的抗鹽結構特征。如表皮細胞外切向壁明顯加厚,表皮外有明顯的角質層覆蓋;氣孔稀少、氣孔下陷及具有孔下室結構;大型貯水組織薄壁細胞、粘液細胞、異型維管束等。

The protein accumulated mainly in secondary phloem parenchyma cells and secondary phloem ray cells . the degradation of storage protein in terminal branchlets of swietenia macrophylla synchronized with new shoot growth after leaf - absent period , suggesting that the protein was utilized to support the growth of new shoots . when the diminishing of the storage protein below the girdled site was blocked , the new shoot growth was also restrained 在樹木新的年生長周期中,隨著新梢的發育,積累在末端小枝中的貯藏蛋白質開始被消耗新梢葉片成熟時,末端小枝中的18kda和21kda蛋白質己完全消失,而樹干和大根中的這兩種蛋白質的含量相對穩定,與落葉期相比幾乎沒有變化。

The secondary phloem parenchyma cells and secondary phloem ray parenchyma cells were the preferential sites for protein storage to the xylem parenchyma cells whereas a large amount of vegetative storage proteins was present in xylem , especially in the primary xylem and the inner secondary xylem of the extended stems 營養貯藏蛋白質優先在次生韌皮部的韌皮薄壁細胞和韌皮射線薄壁細胞中積累,在新梢伸長生長停止后,新梢基部莖的木質部中也積累了相當數量的營養貯藏蛋白質,主要分布在初生木質部和內側次生木質部的各種生活的薄壁細胞中。

Results essential oil was not found in the promeristem of stem ; in the primary meristem of stem and the early stage of stem ' s primary structure , the essential oil was mainly distributed in glandular hairs ; in the primary structure of stem , the essential oil was mainly distributed in cortex parenchyma cells ; in the secondary structure of stem , the essential oil was mainly distributed in remaining cortex parenchyma cell 結果在廣藿香莖的原分生組織中,未觀察到有揮發油分布;在莖的初生、分生組織和初生結構形成早期,揮發油主要分布在莖表皮上著生的腺毛中;在莖的初生結構中,揮發油主要分布在皮層薄壁組織細胞中;在莖的次生結構中,揮發油則主要分布在殘存的皮層薄壁組織細胞中。

We have observed the following characteristics of anatomical structure and development : ( 1 ) the primary roots belong to archetype and the lateral roots occur in the position toward the xylem of the vascular cylinder ; ( 2 ) the root endodermis consists of thicken casparian strips , and there are from two lo four layers parenchyma cells near the pericycle ; ( 3 ) the pith and resins canals are absent in the toots ; ( 4 ) secondary structure occurs in the root hair zone , and vascular cambium is formed from the parenchyma cells between the primary xylem and primary phloem ; ( 5 ) tanning materials are abundant in pericycle cells and phelloderm cells ; ( 6 ) sclereids are found in secondary phloem , and rays are rather rich in secondary xylem 結果表明:氣生不定根具有以下結構特征和發育特點: ( 1 )根為二原型,側根正對著木質部發生; ( 2 )幼根內皮層細胞具凱氏帶加厚,維管柱內緊挨中柱鞘內側具有2 ~ 4層大型薄壁細胞; ( 2 )根中無髓和樹脂道; ( 4 )次生結構發生于根毛區,維管形成層由初生木質部和初生韌皮部之間的薄壁細胞轉化形成; ( 5 )中柱鞘和栓內層細胞富含單寧類物質; ( 6 )次生韌皮部有石細胞,次生木質部射線發達。