Mechanisms of Crop Response to Salt Stress

A special issue of Plants (ISSN 2223-7747). This special issue belongs to the section "Plant Response to Abiotic Stress and Climate Change".

Deadline for manuscript submissions: closed (31 May 2024) | Viewed by 1660

Special Issue Editors


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Guest Editor
Laboratory of Plant Physiology and Morphology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
Interests: salinity tolerance rice; abiotic stress
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Guest Editor
Laboratory of Organic Chemistry, Graduate School of Science, Nagoya University, Nagoya, Japan
Interests: molecular and physiological mechanisms of salt tolerance in rice; use of small molecules to dissect salt tolerance mechanisms in rice
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Salt stress is one of many significant abiotic stresses that limit agricultural production. Salinity influences various aspects of different plant developmental stages, including germination, shoot and root growth at the vegetative stage, and yield-forming processes at the reproductive stage. The molecular mechanisms of crop responses to salt stress are complex, polygenic, and dependent on multiple signaling cascades that govern salt stress responses and tolerance mechanisms. High salt stress affects plants in multiple ways, resulting in ion toxicity, nutritional disorders, alterations in metabolic processes, oxidative stress, etc. More research is still needed to understand the perception of salt stress, the interactions between crop development and salinity, and the signaling of key components of salt sensors toward improving crop salt tolerance under field conditions.

Furthermore, it is still necessary to determine the detailed mechanisms of traits related to salt tolerance, such as salt removal and tissue tolerance, and their contribution to crop production under saline conditions. This Special Issue welcomes recent articles related to all of the above-mentioned areas to showcase current efforts toward understanding the underlying molecular mechanisms of salinity stress and foster advancements in crop tolerance.

Dr. Shiro Mitsuya
Dr. Nicola S. Skoulding
Guest Editors

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Keywords

  • crop
  • wheat
  • rice
  • maize
  • barley
  • salt stress
  • salinity
  • grain yield
  • stress-responsive genes
  • ion transport
  • production
  • tolerance mechanisms
  • salt-removal ability
  • tissue tolerance

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Published Papers (1 paper)

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Research

18 pages, 3740 KiB  
Article
Positive Regulatory Roles of Manihot esculenta HAK5 under K+ Deficiency or High Salt Stress
by Minghua Luo, Jing Chu, Yu Wang, Jingyan Chang, Yang Zhou and Xingyu Jiang
Plants 2024, 13(6), 849; https://doi.org/10.3390/plants13060849 - 15 Mar 2024
Cited by 1 | Viewed by 1220
Abstract
HAK/KUP/KT family members have been identified as playing key roles in K+ uptake and salt tolerance in numerous higher plants. However, their functions in cassava (Manihot esculenta Cantz) remain unknown. In this study, a gene encoding for a high-affinity potassium transporter [...] Read more.
HAK/KUP/KT family members have been identified as playing key roles in K+ uptake and salt tolerance in numerous higher plants. However, their functions in cassava (Manihot esculenta Cantz) remain unknown. In this study, a gene encoding for a high-affinity potassium transporter (MeHAK5) was isolated from cassava and its function was investigated. Subcellular localization analysis showed that MeHAK5 is a plasma membrane-localized transporter. RT-PCR and RT-qPCR indicated that MeHAK5 is predominantly expressed in cassava roots, where it is upregulated by low potassium or high salt; in particular, its highest expression levels separately increased by 2.2 and 2.9 times after 50 µM KCl and 150 mM NaCl treatments. When heterologously expressed in yeast, MeHAK5 mediated K+ uptake within the cells of the yeast strain CY162 and rescued the salt-sensitive phenotype of AXT3K yeast. MeHAK5 overexpression in transgenic Arabidopsis plants exhibited improved growth and increased shoot K+ content under low potassium conditions. Under salt stress, MeHAK5 transgenic Arabidopsis plants accumulated more K+ in the shoots and roots and had reduced Na+ content in the shoots. As a result, MeHAK5 transgenic Arabidopsis demonstrated a more salt-tolerant phenotype. These results suggest that MeHAK5 functions as a high-affinity K+ transporter under K+ starvation conditions, improving K+/Na+ homeostasis and thereby functioning as a positive regulator of salt stress tolerance in transgenic Arabidopsis. Therefore, MeHAK5 may be a suitable candidate gene for improving K+ utilization efficiency and salt tolerance. Full article
(This article belongs to the Special Issue Mechanisms of Crop Response to Salt Stress)
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