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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >LATERAL ROOT INITIATION BY ASYMMETRICAL TRANSVERSE DIVISIONS OF PERICYCLE CELLS IN FOUR PLANT SPECIES - RAPHANUS SATIVUS, HELIANTHUS ANNUUS, ZEA MAYS, AND DAUCUS CAROTA
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LATERAL ROOT INITIATION BY ASYMMETRICAL TRANSVERSE DIVISIONS OF PERICYCLE CELLS IN FOUR PLANT SPECIES - RAPHANUS SATIVUS, HELIANTHUS ANNUUS, ZEA MAYS, AND DAUCUS CAROTA

机译：横向不对称分裂对四种植物周细胞的不对称横切起始-菜豆，向日葵，ZEA MAYS和胡萝卜

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摘要

In roots of Raphanus sativus, Helianthus annuus, Zea mays, and Daucus carota, lateral root initiation occurs when a pair of neighbouring elongated and highly vacuolated pericycle cells in the same column almost simultaneously undergo asymmetrical transversal division. This produces a pair of very short pericycle cells lying end-to-end, flanked above and below by two longer cells. This occurs because both mitoses occur close to the ends of the neighbouring pericycle cells. The two longer daughter pericycle cells divide again later. In roots of radish, sunflower, and carrot these cells divide transversely and asymmetrically, producing more short cells adjacent to the previous ones. In corn roots, they undergo oblique divisions. Much later, the first pair of short pericycle cells undergoes periclinal divisions. Although such periclinal divisions of pericycle cells are generally thought to mark lateral root initiation, our results show that the first pair of short neighbouring pericycle cells in the same column offers another morphological criterion which permits identification of the site of lateral root initiation, both earlier and nearer to the apex than previously documented. [References: 27]
机译：在萝卜（Raphanus sativus），向日葵（Helianthus annuus），玉米（Zea mays）和胡萝卜（Daucus carota）的根中，当在同一列中的一对相邻的细长且高度气化的周周细胞几乎同时经历不对称的横向分裂时，发生侧向根起始。这将产生一对非常短的周向细胞，它们端对端地位于上方，下方是两个较长的细胞。发生这种情况的原因是，两个有丝分裂都靠近相邻的周细胞的末端。较长的两个子周细胞分裂后又分裂。在萝卜，向日葵和胡萝卜的根中，这些细胞横向和不对称地分裂，与先前的细胞相邻产生更多的短细胞。在玉米根中，它们会发生斜裂。不久之后，第一对短周周细胞经历了周周膜分裂。尽管通常认为周缘细胞的这种周缘细胞分裂标记了侧向根的起始，但我们的结果表明，同一列中的第一对短的相邻周缘细胞提供了另一种形态学标准，该标准允许在较早和较早时鉴定出侧向根的起始位置。比先前记录的更接近顶点。 [参考：27]

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