Details
| Original language | English |
|---|---|
| Article number | 677 |
| Number of pages | 15 |
| Journal | Agronomy |
| Volume | 10 |
| Issue number | 5 |
| Publication status | Published - 11 May 2020 |
Abstract
Cucumber (Cucumis sativus L.), an important vegetable crop, is sensitive to NaCl. Its salinity tolerance can be improved by grafting onto pumpkin rootstocks, which restricts the uptake of Na+, but not of Cl-. Although Na+ seems to be more toxic than Cl- in cucumber, tissue tolerance to Na+ and Cl- is still unclear. In this study, a mixed-salt experiment, designed for equal osmolarity and equimolar concentrations of ions between treatments, was conducted using cucumber genotypes "Aramon" and "Line-759," which are different in Na+ and Cl- exclusion. This combination of treatments generated various patterns of ion concentrations in leaves for deriving the response curves of photosynthesis and stomatal conductance to ion concentrations. In both cultivars, photosynthesis and stomatal conductance were sensitive to leaf Na+ concentration but insensitive to Cl- concentration. In these genotypes, tissue tolerance to Na+ varied independently of Na+ exclusion. Grafting "Aramon" onto pumpkin rootstock modified the Na+/Cl- ratio in leaves, reduced Na+ uptake, enhanced K+ transport towards the young leaves, and induced Cl- recirculation to the old leaves. These results suggest that (1) cucumber cannot restrict the Na+ accumulation in leaves but is able to avoid overaccumulation of Cl-, and (2) pumpkin rootstock regulates the recirculation of K+ and Cl-, but not Na+
Keywords
- Cucumis sativus, Grafting, Ion exclusion, Ion recirculation, Ion toxicity, Salt stress, Tissue tolerance
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: Agronomy, Vol. 10, No. 5, 677, 11.05.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Determining Ion Toxicity in Cucumber under Salinity Stress
AU - Chen, Tsu Wei
AU - Pineda, Ilka Mabell Gomez
AU - Brand, Annika Marlen
AU - Stützel, Hartmut
N1 - Funding Information: Funding: The publication of this article was funded by the Open Access Fund of the Leibniz Universität Hannover. Funding Information: Acknowledgments: The authors thank USDA–North Central Regional Plant Introduction Station (Ames, IA, USA), who provided the seeds of the cucumber cultivar Line-759. I.M.G.P. was supported by the German Academic Exchange Service (DAAD) through its Development-Related Postgraduate Courses. The authors also thank Ilona Napp for her help throughout the experiment and Marie-Luise Lehmann for chemical analyses.
PY - 2020/5/11
Y1 - 2020/5/11
N2 - Cucumber (Cucumis sativus L.), an important vegetable crop, is sensitive to NaCl. Its salinity tolerance can be improved by grafting onto pumpkin rootstocks, which restricts the uptake of Na+, but not of Cl-. Although Na+ seems to be more toxic than Cl- in cucumber, tissue tolerance to Na+ and Cl- is still unclear. In this study, a mixed-salt experiment, designed for equal osmolarity and equimolar concentrations of ions between treatments, was conducted using cucumber genotypes "Aramon" and "Line-759," which are different in Na+ and Cl- exclusion. This combination of treatments generated various patterns of ion concentrations in leaves for deriving the response curves of photosynthesis and stomatal conductance to ion concentrations. In both cultivars, photosynthesis and stomatal conductance were sensitive to leaf Na+ concentration but insensitive to Cl- concentration. In these genotypes, tissue tolerance to Na+ varied independently of Na+ exclusion. Grafting "Aramon" onto pumpkin rootstock modified the Na+/Cl- ratio in leaves, reduced Na+ uptake, enhanced K+ transport towards the young leaves, and induced Cl- recirculation to the old leaves. These results suggest that (1) cucumber cannot restrict the Na+ accumulation in leaves but is able to avoid overaccumulation of Cl-, and (2) pumpkin rootstock regulates the recirculation of K+ and Cl-, but not Na+
AB - Cucumber (Cucumis sativus L.), an important vegetable crop, is sensitive to NaCl. Its salinity tolerance can be improved by grafting onto pumpkin rootstocks, which restricts the uptake of Na+, but not of Cl-. Although Na+ seems to be more toxic than Cl- in cucumber, tissue tolerance to Na+ and Cl- is still unclear. In this study, a mixed-salt experiment, designed for equal osmolarity and equimolar concentrations of ions between treatments, was conducted using cucumber genotypes "Aramon" and "Line-759," which are different in Na+ and Cl- exclusion. This combination of treatments generated various patterns of ion concentrations in leaves for deriving the response curves of photosynthesis and stomatal conductance to ion concentrations. In both cultivars, photosynthesis and stomatal conductance were sensitive to leaf Na+ concentration but insensitive to Cl- concentration. In these genotypes, tissue tolerance to Na+ varied independently of Na+ exclusion. Grafting "Aramon" onto pumpkin rootstock modified the Na+/Cl- ratio in leaves, reduced Na+ uptake, enhanced K+ transport towards the young leaves, and induced Cl- recirculation to the old leaves. These results suggest that (1) cucumber cannot restrict the Na+ accumulation in leaves but is able to avoid overaccumulation of Cl-, and (2) pumpkin rootstock regulates the recirculation of K+ and Cl-, but not Na+
KW - Cucumis sativus
KW - Grafting
KW - Ion exclusion
KW - Ion recirculation
KW - Ion toxicity
KW - Salt stress
KW - Tissue tolerance
UR - http://www.scopus.com/inward/record.url?scp=85085517823&partnerID=8YFLogxK
U2 - 10.3390/agronomy10050677
DO - 10.3390/agronomy10050677
M3 - Article
AN - SCOPUS:85085517823
VL - 10
JO - Agronomy
JF - Agronomy
SN - 2073-4395
IS - 5
M1 - 677
ER -