Salt Tolerance and Na Allocation in Sorghum bicolor under Variable Soil and Water Salinity
Abstract
:1. Introduction
2. Materials and Methods
2.1. Acronyms
2.2. Experimental Set Up
2.3. Plant Growth
2.4. Leaf Water Status
2.5. Mineral Elements
2.5.1. Bioaccumulation Factor
2.5.2. Selective Absorption
2.5.3. Translocation Index
2.5.4. Vector Analysis of Dry Weight and Element Concentration and Content
2.6. Statistical Analysis and Data Presentation
3. Results
3.1. Water and Na Input to the System
3.2. Morphological Traits
3.3. Final Plant Growth
3.4. Leaf Water Status
3.5. Cation Accumulation and Translocation
3.6. Principal Component Analysis of Plant Traits
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Treatment No. | Soil Salinity ECe (dS m−1) | Water Salinity ECw (dS m−1) | Salt Leaching (SL) |
---|---|---|---|
1 | 0 | 0 | No |
2 | 0 | 2–4 | No |
3 | 0 | 4–8 | No |
4 | 3 | 0 | No |
5 | 3 | 2–4 | No |
6 | 3 | 4–8 | No |
7 | 6 | 0 | No |
8 | 6 | 2–4 | No |
9 | 6 | 4–8 | No |
10 | 0 | 0 | Yes |
11 | 0 | 2–4 | Yes |
12 | 0 | 4–8 | Yes |
13 | 3 | 0 | Yes |
14 | 3 | 2–4 | Yes |
15 | 3 | 4–8 | Yes |
16 | 6 | 0 | Yes |
17 | 6 | 2–4 | Yes |
18 | 6 | 4–8 | Yes |
Treatment | Water Input (L) | Water Output (L) | LF (%) | Na Input Soil (g) | Na Input Water (g) | Na Output with Leaching (g) | Na Output–Input (g) |
---|---|---|---|---|---|---|---|
Ctrl No SL | 33.8 | 0.8 | 2.4 | 3.6 | 0.4 | 0.02 | 4.0 |
HSS-HWS No SL | 24.6 | 0.5 | 2.1 | 15.2 | 10.0 | 1.59 | 23.6 |
Ctrl SL | 55.1 | 15.9 | 28.8 | 3.6 | 0.6 | 0.33 | 3.8 |
HSS-HWS SL | 49.1 | 21.5 | 43.8 | 15.2 | 27.9 | 16.09 | 27.1 |
Treatment | Na(R) | Na(S) | Na(L) | K(R) | K(S) | K(L) | Ca(R) | Ca(S) | Ca(L) | Mg(R) | Mg(S) | Mg(L) | BAF(Na) | SA(K) | SA(Ca) | SA(Mg) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ctrl No SL | 3.19 b | 0.44 b | 0.20 c | 7.39 a | 4.76 | 7.62 | 8.62 | 8.31 a | 6.25 a | 1.68 | 5.20 a | 3.40 a | 1.72 b | 0.79 | 0.07 a | 0.31 a |
HSS-HWS No SL | 8.66 a | 8.47 a | 6.59 a | 3.32 c | 8.11 | 7.83 | 9.74 | 3.89 c | 4.19 b | 1.69 | 2.08 b | 1.70 c | 3.16 a | 0.51 | 0.02 b | 0.08 b |
Ctrl SL | 2.50 b | 0.25 b | 0.18 c | 7.82 a | 6.97 | 8.08 | 7.39 | 6.48 b | 5.89 a | 1.56 | 3.39 b | 3.08 ab | 1.58 b | 1.04 | 0.06 a | 0.26 a |
HSS-HWS SL | 8.58 a | 5.99 a | 0.71 b | 4.66 b | 5.73 | 7.58 | 8.62 | 4.66 bc | 3.91 b | 1.61 | 3.06 b | 2.44 bc | 1.73 b | 0.73 | 0.05 a | 0.23 b |
p | 0.001 ** | 0.001 ** | 0.001 ** | 0.001 ** | 0.338 ns | 0.833 ns | 0.651 ns | 0.022 ** | 0.018 * | 0.962 ns | 0.080 ** | 0.0043 ** | 0.018 * | 0.054 (+) | 0.003 ** | 0.002 ** |
Treat. | DW | Elem. | Conc. | Cont. | Interpretation |
---|---|---|---|---|---|
HSS-HWS No SL | Na | ~ | Na toxicity Excess Na associated with normal soil moisture caused a strong decrease in biomass and K, Ca, and Mg content. However, the concentration of all these elements except Mg remained constant, meaning that the reduction in their content was proportional to biomass reduction. The drop in Mg concentration indicates a reduction in Mg uptake proportionally greater than biomass reduction. Na content remained unvaried but, due to the drastic biomass reduction, its concentration increased dramatically. | ||
K | ~ | ||||
Ca | ~ | ||||
Mg | |||||
CTRL SL | ~ | Na | ~ | ~ | Water excess Water availability exceeding the soil water holding capacity did not determine extra biomass gain, nor did it influence Na, K, Ca, and Mg concentration and content. |
K | ~ | ~ | |||
Ca | ~ | ~ | |||
Mg | ~ | ~ | |||
HSS-HWS SL | Na | Na and water excess Irrigation with saline water exceeding the soil water holding capacity slightly reduced K, Ca, and Mg concentration and content and plant biomass. The concentration of all these elements except Mg remained constant, meaning that the reduction in their content was proportional to biomass reduction. The drop in Mg concentration indicates a reduction in Mg uptake proportionally greater than biomass reduction. Na concentration and content, on the contrary, increased considerably. | |||
K | ~ | ||||
Ca | ~ | ||||
Mg |
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Calone, R.; Sanoubar, R.; Lambertini, C.; Speranza, M.; Vittori Antisari, L.; Vianello, G.; Barbanti, L. Salt Tolerance and Na Allocation in Sorghum bicolor under Variable Soil and Water Salinity. Plants 2020, 9, 561. https://doi.org/10.3390/plants9050561
Calone R, Sanoubar R, Lambertini C, Speranza M, Vittori Antisari L, Vianello G, Barbanti L. Salt Tolerance and Na Allocation in Sorghum bicolor under Variable Soil and Water Salinity. Plants. 2020; 9(5):561. https://doi.org/10.3390/plants9050561
Chicago/Turabian StyleCalone, Roberta, Rabab Sanoubar, Carla Lambertini, Maria Speranza, Livia Vittori Antisari, Gilmo Vianello, and Lorenzo Barbanti. 2020. "Salt Tolerance and Na Allocation in Sorghum bicolor under Variable Soil and Water Salinity" Plants 9, no. 5: 561. https://doi.org/10.3390/plants9050561