Nitrogen supply influences photosynthesis establishment along the sugarcane leaf.
Nitrogen supply influences photosynthesis establishment along the sugarcane leaf.
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DOI：
10.1038/s41598-018-20653-1
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发表时间：
2018-02-02
影响因子：
4.6
通讯作者：
Mattiello L
中科院分区：
文献类型：
--
作者：
Bassi D;Menossi M;Mattiello L
氮（N）是光合作用装置的主要成分，广泛用作农作物的肥料。然而，据我们所知，迄今为止，生物能源作物甘蔗中由于氮供应差异而导致的光合作用建立的动态尚未见报道。为了解决这个问题，我们评估了在高氮和低氮条件下生长的两种截然不同的基因型（响应性（R）和非响应性（NR））沿甘蔗叶的生理和代谢变化。我们发现氮供应和基因型的反应性决定了衰老程度、磷酸烯醇丙酮酸羧化酶（PEPcase）介导的羧化过程以及可溶性糖的差异积累。代谢物谱表明，在暴露于高氮条件下，NR 基因型在最年轻的组织中具有更高的呼吸速率。我们观察到，在高氮条件下，R 基因型的几乎所有叶段中与光合作用相关的代谢物水平升高，表明氮供应和对氮的反应能力影响光合作用。因此，我们观察到氮对光合作用和其他途径的影响取决于基因型和叶区域。
Nitrogen (N) is a major component of the photosynthetic apparatus and is widely used as a fertilizer in crops. However, to the best of our knowledge, the dynamic of photosynthesis establishment due to differential N supply in the bioenergy crop sugarcane has not been reported to date. To address this question, we evaluated physiological and metabolic alterations along the sugarcane leaf in two contrasting genotypes, responsive (R) and nonresponsive (NR), grown under high- and low-N conditions. We found that the N supply and the responsiveness of the genotype determined the degree of senescence, the carboxylation process mediated by phosphoenolpyruvate carboxylase (PEPcase) and differential accumulation of soluble sugars. The metabolite profiles indicated that the NR genotype had a higher respiration rate in the youngest tissues after exposure to high N. We observed elevated levels of metabolites related to photosynthesis in almost all leaf segments from the R genotype under high-N conditions, suggesting that N supply and the ability to respond to N influenced photosynthesis. Therefore, we observed that N influence on photosynthesis and other pathways is dependent on the genotype and the leaf region.
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影响因子：
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