- n.
【植物；植物學】栓內(nèi)層。adj.
-al
下載手機詞典可隨時隨地查詞查翻譯
phelloderm中文什么意思
例句與用法
- 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(jié)果表明：氣生不定根具有以下結(jié)構(gòu)特征和發(fā)育特點： ( 1 )根為二原型，側(cè)根正對著木質(zhì)部發(fā)生； ( 2 )幼根內(nèi)皮層細胞具凱氏帶加厚，維管柱內(nèi)緊挨中柱鞘內(nèi)側(cè)具有2 ~ 4層大型薄壁細胞； ( 2 )根中無髓和樹脂道； ( 4 )次生結(jié)構(gòu)發(fā)生于根毛區(qū)，維管形成層由初生木質(zhì)部和初生韌皮部之間的薄壁細胞轉(zhuǎn)化形成； ( 5 )中柱鞘和栓內(nèi)層細胞富含單寧類物質(zhì)； ( 6 )次生韌皮部有石細胞，次生木質(zhì)部射線發(fā)達。