Abstract
Background and aims
Populus bolleana Lauche. (P. bolleana) and Populus euphratica Oliv. (P. euphratica) separately survive in mild and moderate alkaline soil conditions. The aim of this study was to explore the underlying mechanism for the different alkaline tolerance in the two poplar species.
Methods
Young saplings of two poplar species were grown in moderate alkaline soil, and the young and old leaves of the two poplars were separately analyzed by ion concentration, allocation and distribution, transcript variation of different genes involved in ion transport and nitrogen assimilation, nitrogen metabolism, organic acid, leaf pigments, and redox responses.
Results
Excess Na+ under alkali stress was mainly allocated to old leaves in P. bolleana. However, excess Na+ was allocated to both young and old leaves in P. euphratica, and was balanced by enhanced levels of Mg2+, Ca2+, and SO42−, with no change in oxidative parameter. The reduction of nitrate nitrogen occurred under alkali stress in both species; P. euphratica acclimated to alkali stress by more flexible regulation of N metabolism and nitrate absorption than P. bolleana.
Conclusions
Our results strongly indicated different alkali tolerance mechanisms in P. bolleana and P. euphratica. P. bolleana protects young tissues via profound accumulation of Na+ and confining damage effects into the old leaves under alkali stress, while P. euphratica can effectively compartmentalize excess Na+, keep its ion balance, and adjust nitrogen transport and metabolism in both young and old leaves to avoid alkali damage.
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Abbreviations
- NHX:
-
Na+/H+ antiporter
- SOS1:
-
Salt overly sensitive
- AMT:
-
Ammonium transporter
- NRT:
-
Nitrate transporter
- NR:
-
Nitrate reductase
- NiR:
-
Nitrite reductase
- AS:
-
Asparagine synthetase
- GS:
-
Glutamine synthetase;1
- AspAT:
-
Aspartate aminotransferase
- GDH:
-
Glutamate dehydrogenase
- NADH:
-
Nicotinamide adenine dinucleotide
- NADH-GOGAT:
-
NADH-dependent glutamine-2-oxoglutarate aminotransferase
- SOD:
-
Superoxide dismutase
- Fd-GOGAT:
-
Ferredoxin-dependent glutamate synthase
- HKT:
-
High-affinity potassium transporter
- HAK:
-
High-affinity potassium transporter
- MDA:
-
Malondialdehyde
- CAT:
-
catalase
- POD:
-
Peroxidase
- OH− :
-
Hydroxide anion
- OAs:
-
Organic acids
- HPLC:
-
High performance liquid chromatography
- qRT-PCR:
-
Qualitatively real-time PCR
- ROS:
-
Reactive oxygen species
- TBARS:
-
Thiobarbituric acid reactive substance
- PE:
-
Spectrophotometer
- LSD:
-
Least significance difference
- TCA:
-
Tricarboxylic acid cycle
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Funding
This research was supported by the Youth Foundation of Science and Technology in Sichuan, China, (No. 2014JQ0016), Natural Science Foundation of China (31770644 and 31270660), Project of Innovation research team in the Sichuan Education Administration (No. 13TD0023), and the Longshan Talent Program of Southwestern University of Science and Technology.
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Fig. S1
Effects of alkali stress on the expression of genes involved in Na+ absorption and metabolism in young and old leaves of two poplars. White bars indicate young leaves of control (CK-Young), light gray bars indicate old leaves of control (CK-Old), gray bars indicate young leaves under alkali treatment (A-Young), and black bars indicate old leaves under alkali treatment (A-Old). Columns represent values which are means (± SE) of four biological replicates. Statistically significant between organs at same stress condition, different letters on the bars indicate significant difference. P values of the ANOVAs of species, control, alkali treatment, and their interaction are indicated. *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001; ns, not significant (GIF 36 kb)
Fig. S2
Effects of alkali stress on the expression of HAK gene family in young and old leaves of two poplars. White bars indicate young leaves of control (CK-Young), light gray bars indicate old leaves of control (CK-Old), gray bars indicate young leaves under alkali treatment (A-Young), and black bars indicate old leaves under alkali treatment (A-Old). Columns represent values which are means (± SE) of four biological replicates. Statistically significant between organs at same stress condition, different letters on the bars indicate significant difference. P values of the ANOVAs of species, control, alkali treatment, and their interaction are indicated. *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001; ns, not significant (GIF 64 kb)
Fig. S3
Effects of alkali treatment on the expression of NRT gene family in young and old leaves of two poplars. White bars indicate young leaves of control (CK-Young), light gray bars indicate old leaves of control (CK-Old), gray bars indicate young leaves under alkali treatment (A-Young), and black bars indicate old leaves under alkali treatment (A-Old). Columns represent values which are means (± SE) of four biological replicates. Statistically significant between organs at same stress condition, different letters on the bars indicate significant difference. P values of the ANOVAs of species, control, alkali treatment, and their interaction are indicated. *P < 0.05; **P < 0.01; ***P < 0.001; ****P < 0.0001; ns, not significant (GIF 28 kb)
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Sun, Y., Ou, Y., Gao, Y. et al. Different tolerance mechanism to alkaline stresses between Populus bolleana and its desert relative Populus euphratica. Plant Soil 426, 349–363 (2018). https://doi.org/10.1007/s11104-018-3632-7
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DOI: https://doi.org/10.1007/s11104-018-3632-7