磷和氮的相互作用:pdr23突变体在磷或氮限制下预计会失去QC身份

Cibele Tesser da Costa, M. L. Strieder, S. Abel, C. A. Delatorre
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引用次数: 7

摘要

根构型的变化是植物对有限的养分供应作出反应,以增加获得养分的几率的一种重要适应策略。静止中心(QC)通过改变分生组织的活性,引起分化,从而诱导确定的生长程序,发挥重要作用。拟南芥突变体pdr23在硝酸盐存在下呈现初生短根,不能有效利用核酸作为磷的来源。本研究评估了pdr23突变对低磷和/或低氮条件下植株QC维持的影响。在没有硝酸盐和/或磷酸盐的野生型中,如果核酸可以作为这些营养物质的替代来源,则QC特性保持不变,但在pdr23中则不然。突变是不能有效地利用核酸替代π,决定性的增长是观察,类似于总没有野生型P没有N pdr23失去QC身份标记比野生型的表达,表明不仅响应P是改变,而且联合国数据表明,突变影响基因在这些营养素之间的串扰或共享的途径都营养限制的反应。此外,在野生型中,在较长的限制条件下,在缺乏N的情况下,也观察到QC身份的丧失。在两种基因型的侧根中观察到的症状不那么剧烈。
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Phosphorus and nitrogen interaction: loss of QC identity in response to P or N limitation is antecipated in pdr23 mutant
Changes in root architecture are an important adaptive strategy used by plants in response to limited nutrient availability to increase the odds of acquiring them. The quiescent center (QC) plays an important role by altering the meristem activity causing differentiation and therefore, inducing a determinate growth program. The arabidopsis mutant pdr23 presents primary short root in the presence of nitrate and is inefficient in the use of nucleic acids as a source of phosphorus. In this study the effect of the pdr23 mutation on the QC maintenance under low phosphorus (P) and/or nitrogen is evaluated. QC identity is maintained in wild-type in the absence of nitrate and/or phosphate if nucleic acids can be used as an alternative source of these nutrients, but not in pdr23. The mutant is not able to use nucleic acids efficiently for substitute Pi, determinate growth is observed, similar to wild-type in the total absence of P. In the absence of N pdr23 loses the expression of QC identity marker earlier than wild-type, indicating that not only the response to P is altered, but also to N. The data suggest that the mutation affects a gene involved either in the crosstalk between these nutrients or in a pathway shared by both nutrients limitation response. Moreover loss of QC identity is also observed in wild-type in the absence of N at longer limitation. Less drastic symptoms are observed in lateral roots of both genotypes.
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