High light intensity aggravates latent manganese deficiency in maize
High light intensity aggravates latent manganese deficiency in maize
复制标题
高光强度加剧玉米潜在缺锰现象
DOI：
10.1093/jxb/eraa366
复制
发表时间：
2020-10-07
影响因子：
6.9
通讯作者：
Yuan, Lixing
中科院分区：
文献类型：
--
作者：
Long, Lizhi;Pedas, Pai R.;Yuan, Lixing
锰（Mn）在演化氧络合物中起着重要作用，其中吸收光的能量用于水的分解。虽然光强和Mn状态的变化可以干扰光合机构的功能，但这两个因素之间的相互作用及其潜在机制在很大程度上仍然未知。在这里，玉米幼苗以水培方式生长，并暴露在两种不同的光强下，分别是富锰和缺锰条件。虽然缺锰处理的叶片锰浓度降至2 μ g / g(-1)，但未出现明显缺锰症状。但PSII的最大量子效率和净光合速率显著下降，表明存在潜在的缺锰现象。在高光照条件下，Mn耗竭对植物光合性能的降低进一步加剧。综合转录组学和蛋白质组学分析表明，相当多的光合机构编码蛋白质的基因仅在缺锰和强光的组合下受到抑制，从而表明Mn营养状况的变化与光强之间存在相互作用。我们得出结论，高光强通过干扰PSII蛋白的丰度加重了玉米的潜在缺锰。
Manganese (Mn) plays an important role in the oxygen-evolving complex, where energy from light absorption is used for water splitting. Although changes in light intensity and Mn status can interfere with the functionality of the photosynthetic apparatus, the interaction between these two factors and the underlying mechanisms remain largely unknown. Here, maize seedlings were grown hydroponically and exposed to two different light intensities under Mn-sufficient or -deficient conditions. No visual Mn deficiency symptoms appeared even though the foliar Mn concentration in the Mn-deficient treatments was reduced to 2 mu g g(-1). However, the maximum quantum yield efficiency of PSII and the net photosynthetic rate declined significantly, indicating latent Mn deficiency. The reduction in photosynthetic performance by Mn depletion was further aggravated when plants were exposed to high light intensity. Integrated transcriptomic and proteomic analyses showed that a considerable number of genes encoding proteins in the photosynthetic apparatus were only suppressed by a combination of Mn deficiency and high light, thus indicating interactions between changes in Mn nutritional status and light intensity. We conclude that high light intensity aggravates latent Mn deficiency in maize by interfering with the abundance of PSII proteins.