Epidermal patterning in seedling roots of eudicotyledons
Epidermal patterning in seedling roots of eudicotyledons
复制标题
DOI：
10.1006/anbo.2001.1385
复制
发表时间：
2001-05-01
期刊：
影响因子：
4.2
通讯作者：
Harris, PJ
中科院分区：
文献类型：
--
作者：
Pemberton, LMS;Tsai, SL;Harris, PJ
被子植物根的表皮有三种类型：第一种类型，所有的表皮细胞都有可能产生根毛（毛细胞）;第二种类型，所有的表皮细胞都有可能产生根毛。不对称细胞分裂产生发育成毛细胞的短细胞和不发育成毛细胞的较大细胞（非毛细胞）;以及在3型中。毛细胞以由一到三列非毛细胞隔开的列出现。本文研究了43科77种真双子叶植物幼苗根的表皮结构。我们发现I型模式是最常见的，没有物种有2型模式。在此之前，3型表皮模式仅在菊科中被描述。除了杜鹃科（包括山柑科），我们发现3型模式在杜鹃科Limnanthaceae和Resedaceae，而我们检查的其他杜鹃科，番木瓜科和旱金莲科：有1型模式。我们还发现了3型模式在六个家庭的Carpellales感：苋科，Basellaceae，Carpellaceae，白花丹科，Polygonaceae和马齿苋科。然而，仙人掌科，这也是在这个顺序，有1型图案。只有一个其他物种，Nemophila maculata（紫草科），有3型图案;我们在这个家庭中检查的其他两个物种有I型图案。因此，3型模式在真双子叶植物中的发生比以前认为的更广泛。(C)2001年《植物学年鉴》（Annals of Botany Company）
Three types of epidermal patterning occur in roots of angiosperms: in Type 1, all the epidermal cells can potentially produce root hairs (hair cells); in Type 2. asymmetric cell divisions produce short cells that develop into hair cells and larger cells that do not (non-hair cells); and in Type 3. hair cells occur in files separated by one to three files of non-hair cells. In the present study we examined the epidermal patternings of seedling roots of 77 eudicotyledonous species from 43 families. We found that Type I patterning was the most common and no species had Type 2 patterning. Previously, Type 3 epidermal patterning had been described only in the family Brassicaceae. In addition to the Brassicaceae (including the Capparaceae), we found Type 3 patterning in the Brassicales families Limnanthaceae and Resedaceae, whereas the other Brassicales families we examined, Caricaceae and Tropaeolaceae: had Type 1 patterning. We also found Type 3 patterning in six families of the Caryophyllales sensu late: Amaranthaceae, Basellaceae, Caryophyllaceae, Plumbaginaceae, Polygonaceae and Portulacaceae. However, the family Cactaceae, which is also in this order, had Type 1 patterning. Only one other species, Nemophila maculata (Boraginaceae), had Type 3 patterning; the other two species that we examined in this family had Type I patterning. Type 3 patterning thus occurs more widely in the eudicotyledons than was previously thought. (C) 2001 Annals of Botany Company.