The Growth Promotion of Two Salt-Tolerant Plant Groups with PGPR Inoculation: A Meta-Analysis
Abstract
:1. Introduction
2. Materials and Methods
2.1. Literature Search and Selection Criteria
- (1)
- Plants had to be exposed to saline conditions or imposed to salt treatments through irrigation.
- (2)
- A pair-wise experimental design with a control and a PGPR treatment was used.
- (3)
- Only extracellular PGPR taxa were included in this meta-analysis. If articles reported any PGPR interaction with other microbes, such as mycorrhizal fungi or intracellular PGPR, data were exclusively collected for extracellular PGPR to avoid any interactions.
- (4)
- Plants had to be grown in pots, and the growth substrate had to be soil or a mixture of soil and another substrate.
2.2. Data Category and Collection
2.3. Meta-Analysis
2.4. Linear Regression Analyses
3. Results
3.1. PGPR Inoculation Effects on Plant Biomass
3.2. PGPR Inoculation Effects on Osmolytes
3.3. PGPR Inoculation Effects on Plant Nutrient Uptake and Ion Homeostasis
3.4. PGPR Inoculation Effects on Antioxidants, MDA and Photosynthesis
3.5. Contributions of the Physiological Indicators to Biomass Promotion between SSP and STP
4. Discussion
4.1. Publication Bias Test
4.2. PGPR Responsiveness on Biomass between SSP and STP
4.3. Osmotic Adjustment Responding to PGPR Inoculation between SSP and STP
4.4. Nutrient Acquisition and Ion Homeostasis Responding to PGPR Inoculation between SSP and STP
4.5. Antioxidant System Responding to PGPR Inoculation between SSP and STP
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Physiological Indicators (Abbreviation) | Study Numbers (S) | Spearman’s Rank Order Correlation | Fail-Safe Numbers | |
---|---|---|---|---|
R | P | |||
Total biomass | 399 | −0.131 | 0.008 | 947,614 |
Shoot biomass | 254 | 0.018 | 0.774 | 481,795 |
Root biomass | 199 | −0.01 | 0.887 | 287,007 |
Proline (Pro) | 164 | −0.019 | 0.813 | 92,740 |
Soluble sugar (SS) | 49 | 0.111 | 0.448 | 13,472 |
Soluble protein (SP) | 74 | 0.031 | 0.796 | 29,444 |
Nitrogen (N) | 102 | 0.088 | 0.380 | 12,706 |
Phosphorus (P) | 50 | −0.126 | 0.383 | 24,152 |
Potassium ion (K+) | 188 | −0.094 | 0.199 | 80,527 |
Calcium ion (Ca2+) | 101 | −0.282 | 0.004 | 22,491 |
Magnesium ion (Mg2+) | 46 | −0.542 | 0.000 | 10,050 |
Sodium ion (Na+) | 187 | 0.203 | 0.005 | 170,335 |
K+/Na+ ratio | 182 | 0.077 | 0.303 | 54,041 |
Ca2+/Na+ ratio | 102 | −0.373 | 0.000 | 12,049 |
Mg2+/Na+ ratio | 50 | −0.23 | 0.108 | 1008 |
Superoxide dismutase (SOD) | 79 | −0.047 | 0.681 | 22,015 |
Catalase (CAT) | 77 | −0.323 | 0.004 | 26,831 |
Malondialdehyde (MDA) | 63 | −0.266 | 0.035 | 89,408 |
Chlorophyll (Chl) | 220 | 0.086 | 0.203 | 408,830 |
Carotenoid (Car) | 52 | 0.233 | 0.097 | 5913 |
Photosynthetic rate (Pn) | 32 | 0.143 | 0.436 | 580 |
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Pan, J.; Peng, F.; Xue, X.; You, Q.; Zhang, W.; Wang, T.; Huang, C. The Growth Promotion of Two Salt-Tolerant Plant Groups with PGPR Inoculation: A Meta-Analysis. Sustainability 2019, 11, 378. https://doi.org/10.3390/su11020378
Pan J, Peng F, Xue X, You Q, Zhang W, Wang T, Huang C. The Growth Promotion of Two Salt-Tolerant Plant Groups with PGPR Inoculation: A Meta-Analysis. Sustainability. 2019; 11(2):378. https://doi.org/10.3390/su11020378
Chicago/Turabian StylePan, Jing, Fei Peng, Xian Xue, Quangang You, Wenjuan Zhang, Tao Wang, and Cuihua Huang. 2019. "The Growth Promotion of Two Salt-Tolerant Plant Groups with PGPR Inoculation: A Meta-Analysis" Sustainability 11, no. 2: 378. https://doi.org/10.3390/su11020378