root n. 鲁特〔姓氏〕。 n. 1.(草木、毛发等的)根;根菜,食用菜根;根茎,地下茎;块根;有根植物,草木,草;〔pl.〕根菜类;(山)麓。 2.根本,根源,原因;本质;基础,根柢;【语言学】词根;根词;【数学】根数,根。 3.祖先;【圣经】子孙。 4.【音乐】和弦基音。 the root of a tooth 牙根。 the root of all evil 祸根。 the root of a gem 玉根〔毛玉的非玉部分〕。 a cubic [second, square] root 立方[平方]根。 at (the) root 根本上。 be at the root of 是…的根本[基础]。 by the root(s) 连根,从根部,从根源 (pull up by the roots 连根拔除,根除)。 get at [go to] the root of 追究…的根底,追查…的真相。 lay the axe to the root of 根本改革;治本。 root and branch 完全,都;彻底地,急进地。 strike at the root of 打击…的根部,彻底摧毁。 strike [take] root 生根;扎根;固定,固着。 to the root(s) 充分地;竭力地;彻底地。 vi.,vt. (使)生根;(使)固定;(使)固着;〔比喻〕深深种下,使根深蒂固。 Terror rooted him to the spot. 吓得他呆立不动。 root up [out] 连根拔除(杂草等);肃清(反叛等)。 adj. 根的;根本的。 a root idea 根本思想。 vt.,vi. (猪等)用鼻子掘(地);搜寻 (for)。 R-, hog, or die. 〔美国〕拚命干啊,不然就得饿死。 vi. 〔美俚〕应援,声援;支持,赞助;欢呼,喝彩。
Both root and root cap are covered by a sheath-like structure called the coleorhiza . 根和根冠被一鞘状结构,即胚根鞘所覆盖。
They have a physiological role in the root cap and elsewhere , where the starch grains act as statoliths 在根冠及其他部位有重要的生理作用,在那些地方淀粉粒具有平衡石的功能。
Calyptogen a layer of meristematic cells covering the root apical meristem in some plants ( e . g . grasses ) that gives rise to and maintains the root cap 根冠原:在一些植物中覆盖根顶端分生组织的一层具有分生能力的细胞,根冠原可以产生和维持根冠。
After the period of treatments were prolonged for three days , the contain of sugar reduced again . the growth of roots and plants were retarded severely and the ratios of root cap were increased manifestly . the ratios of root - shoot was stability and the growth almost stopped at the later period of peg ( 6000 ) treatment 牛心朴子根系发达,根冠比大,在土壤水分变化时,植株地上部比较敏感,随土壤水分胁迫程度的加强和胁迫时间的延长,植株生长显著变缓,直至停止生长,而根冠比值则有所加大。
The result showed that physiological response were mainly affected by concentration of peg and less affected by time of peg ( 6000 ) treatment . relative water content of leaves root activity , and growth of roots and plants showed a less reduction under 10 - 20 % peg ( 6000 ) treatment , but ratios of root cap , and contains of soluble sugar , contain of pro and potassium showed a less increase . all those just described indexes showed a marked change under 25 % peg treatment 在10 20的peg浓度胁迫下,叶片相对含水量、根系活力、根系及地上部生长量下降的幅度较小;根冠比、可溶性糖、脯氨酸( pro ) 、 k ~ +上升的幅度也较小,而在25的peg浓度胁迫下上述指标发生了很显著的变化,叶片相对含水量、根系活力明显下降,可溶性糖最大含量出现的时间较20浓度胁迫的提早3d ,且较20时的最大含量小,并在延长处理3d后又开始下降,根系和地上部的生长受到严重抑制,且地上部影响大于根系,根冠比显著增大,胁迫后期趋于恒定状态,生长几乎完全停止。
英文解释
thimble-shaped mass of cells covering and protecting the growing tip of a root
百科解释
The root cap is a section of tissue at the tip of a plant root. It is also called calyptra.