Living with high potassium: Balance between nutrient acquisition and K-induced salt stress signaling
Living with high potassium: Balance between nutrient acquisition and K-induced salt stress signaling
复制标题
高钾生活：营养获取与钾诱导的盐胁迫信号之间的平衡
DOI：
10.1093/plphys/kiac564
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发表时间：
2022
期刊：
影响因子：
7.4
通讯作者：
Dassanayake, Maheshi
中科院分区：
文献类型：
--
作者：
Pantha, Pramod;Oh, Dong-Ha;Longstreth, David;Dassanayake, Maheshi
生长介质中的高钾 (K) 会引起植物盐胁迫。然而，植物对钾诱导的盐胁迫反应的分子机制实际上尚不清楚。我们使用比较多组学方法检查了拟南芥 (Arabidopsis thaliana) 及其极端植物近缘雪伦基菌 (Schrenkiella parvulaus)，以确定受过量 K 影响的细胞过程，并了解哪些确定性调节途径处于活跃状态，可在维持生长的同时避免组织损伤。与拟南芥相比，拟南芥抑制过量钾积累和防止养分消耗的能力有限。 parvula 可以限制过量的钾积累而不限制养分吸收。 S 中的靶向转录组反应。 parvula 促进氮和其他关键营养物质的吸收，然后在过量钾胁迫期间不间断地将氮同化为初级代谢物。这导致了更大的抗氧化剂和渗透剂库，并与 S 的持续生长相对应。小儿。相反，拟南芥表现出活性氧水平增加、光合作用减少和转录反应表明应激信号之间的平衡不佳，从而导致生长受限。我们的结果表明，调节独立营养吸收的能力和协调转录组反应以避免非特异性应激信号传导是建立对过量 K+ 诱导的盐胁迫的应激恢复能力的两个主要确定性步骤。
High potassium (K) in the growth medium induces salinity stress in plants. However, the molecular mechanisms underlying plant responses to K-induced salt stress are virtually unknown. We examined Arabidopsis (Arabidopsis thaliana) and its extremophyte relativeSchrenkiella parvulausing a comparative multiomics approach to identify cellular processes affected by excess K and understand which deterministic regulatory pathways are active to avoid tissue damages while sustaining growth. Arabidopsis showed limited capacity to curb excess K accumulation and prevent nutrient depletion, contrasting toS. parvulawhich could limit excess K accumulation without restricting nutrient uptake. A targeted transcriptomic response inS. parvulapromoted nitrogen uptake along with other key nutrients followed by uninterrupted N assimilation into primary metabolites during excess K-stress. This resulted in larger antioxidant and osmolyte pools and corresponded with sustained growth inS. parvula. Antithetically, Arabidopsis showed increased reactive oxygen species levels, reduced photosynthesis, and transcriptional responses indicative of a poor balance between stress signaling, subsequently leading to growth limitations. Our results indicate that the ability to regulate independent nutrient uptake and a coordinated transcriptomic response to avoid nonspecific stress signaling are two main deterministic steps toward building stress resilience to excess K+-induced salt stress.