胚根鞘
- 网络coleorhiza;coleorhizae
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根和根冠被一鞘状结构,即胚根鞘所覆盖。
Both root and root cap are covered by a sheath-like structure called the coleorhiza .
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胚基具有生长带,纵向伸长长度大,胚基的上部参与形成胚根鞘,其余部分干缩后附在胚根鞘末端。
As to the hypoblast there is a growth belt , which promotes elongation of the hypoblast . Eventually the upper portion of the hypoblast contributes to the formation of the coleorhiza and the remainder dries up , sticking to the end of the coleorhiza .
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药理学实验证实,低浓度的GABA能够促进玉米种子萌发及其幼苗胚根、胚芽鞘的生长,高浓度则起抑制作用,其抑制效应可能与内源乙烯水平升高有关。
Pharmacological experiments indicated that low concentration of GABA could promote the growth of radicle and coleoptile and high concentration of GABA could restrained their growth , Presumedly the inhibitory effect had something to do with increase of endogenous ethylene level .