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首页> 外文期刊>Journal of Botany >Role of Ascorbate in the Regulation of theArabidopsis thalianaRoot Growth by Phosphate Availability
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Role of Ascorbate in the Regulation of theArabidopsis thalianaRoot Growth by Phosphate Availability

机译：抗坏血酸在通过磷酸盐可利用性调节拟南芥根生长中的作用

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Arabidopsisroot system responds to phosphorus (P) deficiency by decreasing primary root elongation and developing abundant lateral roots. Feeding plants with ascorbic acid (ASC) stimulated primary root elongation in seedlings grown under limiting P concentration. However, at high P, ASC inhibited root growth. Seedlings of ascorbate-deficient mutant(vtc1)formed short roots irrespective of P availability. P-starved plants accumulated less ascorbate in primary root tips than those grown under high P. ASC-treatment stimulated cell divisions in root tips of seedlings grown at low P. At high P concentrations ASC decreased the number of mitotic cells in the root tips. The lateral root density in seedlings grown under P deficiency was decreased by ASC treatments. At high P, this parameter was not affected by ASC-supplementation.vtc1mutant exhibited increased lateral root formation on either, P-deficient or P-sufficient medium. Irrespective of P availability, high ASC concentrations reduced density and growth of root hairs. These results suggest that ascorbate may participate in the regulation of primary root elongation at different phosphate availability via its effect on mitotic activity in the root tips.
机译：拟南芥系统通过减少初级根的伸长并发育丰富的侧根来应对磷（P）缺乏症。饲喂抗坏血酸（ASC）的植物会刺激在限制P浓度下生长的幼苗中的初生根伸长。但是，在高磷下，ASC抑制了根的生长。缺乏抗坏血酸的突变体（vtc1）的幼苗形成短根，而与磷的有效性无关。缺磷的植株在初级根尖中积累的抗坏血酸少于在高磷条件下生长的植株。ASC处理刺激了低磷生长的幼苗根尖中的细胞分裂。在高磷浓度下，ASC减少了根尖中有丝分裂细胞的数量。缺磷胁迫下幼苗的侧根密度通过ASC处理而降低。在高P时，该参数不受ASC补充的影响.vtc1突变体在P缺乏或P充足的培养基上均表现出增加的侧根形成。不论磷的有效性如何，高浓度的ASC都会降低根毛的密度和生长。这些结果表明，抗坏血酸可能通过其对根尖中有丝分裂活性的影响，参与了在不同磷酸盐利用率下初级根伸长的调节。

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