…The stele is either a primitive stele or a tubular stele, but most species have a reticulate stele. The roots are adventitious roots that branch out as the rhizome elongates, and some species have no roots at all. The leaves are often macrophyllous, but some are microphyllous, like those of the club moss species. … From [Root]…In hymenoptera, when the fertilized egg undergoes two cell divisions to reach the four-cell stage, the four cells are determined to grow into the shoot apex, first leaf, foot, and root, respectively. However, as the stem continues to grow, the older parts die and the first roots eventually disappear, and the adventitious roots that emerge later from the stem are the roots of normal hymenoptera. In articulated plants, the embryo grows exoscopically, does not form a suspensor, and roots differentiate from the part adjacent to the foot. … *Some of the terminology that mentions "adventitious root" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…中心柱は,原生中心柱と管状中心柱の両型がみられるが,多くのものでは網状中心柱となる。根は根茎の伸長につれて分出する不定根adventitious rootであり,根がなくなっているものもある。葉は大葉性のものが多いが,ヒカゲノカズラ類のように小葉性のものもある。… 【根】より…薄囊シダ類では受精卵が2回の細胞分裂を行って四細胞期になった時には,4個の細胞がそれぞれ茎頂,第1葉,あし,根に生長していくことが定まっている。しかし,その後茎が伸長していくにつれて古い部分は枯死してしまうので最初の根はやがて消滅してしまい,のちに茎から分出してくる不定根adventitious rootが,ふつうの薄囊シダ類の根である。有節植物では胚は外向的exoscopicに生長し,胚柄はつけないで,あしに隣接した部分から根が分化してくる。… ※「adventitious root」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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