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Natural variation of Arabidopsis response to nitrogen availability

机译：拟南芥对氮素利用率的自然变化

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Our understanding of plant growth in response to nitrogen (N) supply is mainly based on studies of mutants and transformants. This study explored the natural variability of Arabidopsis thaliana first to find out its global response to N availability and secondly to characterize the plasticity for growth and N metabolism among 23 genetically distant accessions under normal (N+), limited (N–), and starved (N0) N supplies. Plant growth was estimated by eight morphological traits characterizing shoot and root growth and 10 metabolic parameters that represented N and carbon metabolism. Most of the studied traits showed a large variation linked to genotype and nutrition. Furthermore, Arabidopsis growth was coordinated by master traits such as the shoot to root ratio of nitrate content in N+, root fresh matter and root amino acids in N–, and shoot fresh matter together with root thickness in N0. The 23 accessions could be gathered into four different groups, according to their growth in N+, N–, and N0. Phenotypic profiling characterized four different adaptative responses to N– and N0. Class 1 tolerated N limitation with the smallest decrease in shoot and root biomass compared with N+, while class 2 presented the highest resistance to N starvation by preferential increased root growth, huge starch accumulation, and high shoot nitrate content. In contrast, class 3 plants could tolerate neither N limitation nor N starvation. Small plants of class 4 were different, with shoot biomass barely affected in N– and root biomass unaffected in N0.
机译：我们对响应氮（N）供应的植物生长的理解主要基于突变体和转化体的研究。这项研究探索了拟南芥的自然变异性，首先发现了其对氮素有效性的整体响应，其次是在正常（N +），有限（N–）和饥饿（23）下的23个遗传距离较远的种质中表征了生长和氮素代谢的可塑性N0）N个耗材。植物生长是通过表征芽和根生长的八个形态特征以及代表氮和碳代谢的10个代谢参数来估计的。大多数研究的性状表现出与基因型和营养有关的较大变异。此外，拟南芥的生长与主要性状协调一致，例如N +中硝酸盐含量的根与茎比，N-中的根鲜物质和根氨基酸，以及N0中的根与芽鲜食。根据它们在N +，N-和N0中的增长，可以将这23个种质分为四个不同的组。表型分析表征了对N–和N0的四种不同的适应性反应。与N +相比，第1类耐氮限制，茎和根生物量减少最小，而第2类由于优先增加根的生长，大量淀粉积累和高芽硝酸盐含量而表现出对N饥饿的最高抵抗力。相反，第3类植物不能忍受N限制或N饥饿。第4类的小植物有所不同，芽生物量几乎不受N–的影响，而根生物量不受N0的影响。

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