| 单词 | tuber | ||||||
| 释义 | tubertu·berT0399800 (to͞o′bər, tyo͞o′-)tuber(ˈtjuːbə)tu•ber(ˈtu bər, ˈtyu-)n. tu·ber(to͞o′bər)
tubernountuber(ˈtjuːbə) nountubertuber,enlarged tip of a rhizome (underground stem) that stores food. Although much modified in structure, the tuber contains all the usual stem parts—bark, wood, pith, nodes, and internodes. The eyes of a potato tuber are nodes where sprouts appear, and they are arranged in the same spiral pattern characteristic of buds on an aerial stem.Tubera modified shoot of a plant with a thickened stem consisting of one or several internodes (sometimes a thickened hypocotyl or part of the root). Tubers located above the ground are usually green and have leaves (such as kohlrabi and some tropical orchids). Underground tubers usually have the leaves reduced to very small scales that fall off early; the buds that form in their axils are called eyes. Tubers usually store nutrients, most often starch and other carbohydrates, and more rarely, oils (as in chufa). Tubers develop from the parenchymatous cells of the phloem and xylem, and, less often, from the pith. They can appear on the main axis of the plant (usually at the base) as well as on lateral shoots (as in field horsetail and marsh woundwort) and on underground shoots, or runners (as in potatoes and Jerusalem artichoke). Tubers in the form of hypocotyls are found on cyclamen and certain Umbelliferae such as Chaerophyllum, tuberiferous caraway (Carum bulbosa), Corydalis, and Eranthis. Tubers usually serve for propagation. After the runners atrophy, the buds sprout and adventitious roots form, and the tuber develops into a new plant. In some plants aboveground tubers develop into inflorescences. In these cases, small tubers with thickened axes form in the axils of the bract. The buds of the tubers produce from two to four leaves, and, after falling off the plant, the buds take root, forming new plants (viviparous plants). In Ficaria the sprouting of the tubers that develop in the leaf axils and the formation of adventitious roots take place after the tubers fall off the plant, usually after wintering. Plants whose tubers are used as food for man, or feed for animals, or for industrial raw materials are called tuber crops. L. V. KUDRIASHOV tuber[′tü·bər]tubertubertuber[too´ber]tu·ber, pl.tu·ber·a(tū'bĕr, too'ber-ă),tuberAn enlarged tip of a rhizome or a fleshy outgrowth, which stores nutrients.Edible tubers Stem tubers (potato); tuberous roots (sweet potato, cassava, yam, dahlia). tu·ber, pl. tubera (tū'bĕr, -ă)tuberan enlarged underground root or stem containing PARENCHYMA cells packed with STARCH for overwintering. The best known example is the stem tuber of potato which has buds in the axils of tiny leaves (forming the potato ‘eyes’). Root tubers often have a finger-like branched structure, as in the lesser celandine, Ranunculus ficaria.tuber
Synonyms for tuber
|
||||||
| 随便看 |
|
英语词典包含2567994条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。
tuber - a fleshy underground stem or root serving for reproductive and food storage
Tuber - type genus of the Tuberaceae: fungi whose fruiting bodies are typically truffles