The primary meristem of the root tip may be extended a section of distance below the elongation region.

根尖的初生分生组织可扩大到伸长区下方一段距离。

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It was demonstrated that the cell cycle indexes were decreased as long as the concentrations of SNP were increased after collecting the cell division phase of the primary root-tip cells;

对SNP处理的水稻初生根根尖细胞进行细胞分裂相统计，结果表明：随SNP浓度的增大，细胞分裂指数呈下降趋势；

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