The Role of Different Rhizobacteria in Mitigating Aluminum Stress in Rice (<i>Oriza sativa</i> L.)
Aluminum toxicity in acidic soils threatens rice (<i>Oryza sativa</i> L.) cultivation, hindering agricultural productivity. This study explores the potential of plant growth-promoting rhizobacteria (PGPR) as a novel and sustainable approach to mitigate aluminum stress in rice. Two rice v...
Saved in:
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | International Journal of Plant Biology |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2037-0164/15/4/98 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Aluminum toxicity in acidic soils threatens rice (<i>Oryza sativa</i> L.) cultivation, hindering agricultural productivity. This study explores the potential of plant growth-promoting rhizobacteria (PGPR) as a novel and sustainable approach to mitigate aluminum stress in rice. Two rice varieties, INIAP-4M and SUPREMA I-1480, were selected for controlled laboratory experiments. Seedlings were exposed to varying aluminum concentrations (0, 2, 4, 8, and 16 mM) in the presence of four PGPR strains: <i>Serratia marcescens</i> (MO4), <i>Enterobacter asburiae</i> (MO5), <i>Pseudomonas veronii</i> (R4), and <i>Pseudomonas protegens</i> (CHAO). The INIAP-4M variety exhibited greater tolerance to aluminum than SUPREMA I-1480, maintaining 100% germination up to 4 mM and higher vigor index values. The study revealed that rhizobacteria exhibited different responses to aluminum concentrations. <i>P. protegens</i> and <i>S. marcescens</i> showed the highest viability at 0 mM (2.65 × 10<sup>10</sup> and 1.71 × 10<sup>10</sup> CFU mL<sup>−1</sup>, respectively). However, <i>P. veronii</i> and <i>S. marcescens</i> exhibited the highest viability at aluminum concentrations of 2 and 4 mM, indicating their superior tolerance and adaptability under moderate aluminum stress. At 16 mM, all strains experienced a decrease, with <i>P. protegens</i> and <i>E. asburiae</i> being the most sensitive. The application of a microbial consortium significantly enhanced plant growth, increasing plant height to 73.75 cm, root fresh weight to 2.50 g, and leaf fresh weight to 6 g compared to the control (42.75 cm, 0.88 g, and 3.63 g, respectively). These findings suggest that PGPR offer a promising and sustainable strategy to bolster rice resilience against aluminum stress and potentially improve crop productivity in heavy metal-contaminated soils. |
|---|---|
| ISSN: | 2037-0164 |