Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i>
The potential of plant growth-promoting rhizobacteria (PGPR) to improve plant growth and nutrient acquisition has received increased attention. This study investigated the synergistic effects of combining PGPR <i>Paraburkholderia</i> sp. SOS3 with the addition of inorganic N fertilizer (...
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MDPI AG
2021-05-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/11/6/1064 |
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| author | Marta Gallart Chanyarat Paungfoo-Lonhienne Axayacatl Gonzalez Stephen J. Trueman |
| author_facet | Marta Gallart Chanyarat Paungfoo-Lonhienne Axayacatl Gonzalez Stephen J. Trueman |
| author_sort | Marta Gallart |
| collection | DOAJ |
| description | The potential of plant growth-promoting rhizobacteria (PGPR) to improve plant growth and nutrient acquisition has received increased attention. This study investigated the synergistic effects of combining PGPR <i>Paraburkholderia</i> sp. SOS3 with the addition of inorganic N fertilizer (iN) or a combined application of inorganic N with organic manure-based fertilizer (iNoN) at low and high levels of N fertilization on <i>Macadamia integrifolia</i> seedling growth. We studied plant growth, mineral N in soil-leachate, and media physicochemical and microbial characteristics. Growth of seedlings fertilized with iNoN at high N level (iNoN 100) was enhanced by PGPR inoculation, with an increase of 32% in total biomass and 43% in N uptake, compared with uninoculated seedlings. No significant PGPR effect was observed on growth under low or high inorganic N treatments but PGPR significantly reduced N leaching after 3 weeks of fertilization. We found a positive relationship between media and plant δ<sup>15</sup>N and plant N uptake, and a strong increase in microbial-biomass N under the most productive fertilization treatment (iNoN 100 with PGPR), compared with the other N treatments (without or with PGPR). The results suggest that PGPR improves N acquisition by reducing mineral N loss and increasing plant N availability, but that these effects depend on the N form and N level. |
| first_indexed | 2024-03-10T11:03:19Z |
| format | Article |
| id | doaj.art-483abbf12e5b47ed93a4ba60df225812 |
| institution | Directory Open Access Journal |
| issn | 2073-4395 |
| language | English |
| last_indexed | 2024-03-10T11:03:19Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Agronomy |
| spelling | doaj.art-483abbf12e5b47ed93a4ba60df2258122023-11-21T21:20:07ZengMDPI AGAgronomy2073-43952021-05-01116106410.3390/agronomy11061064Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i>Marta Gallart0Chanyarat Paungfoo-Lonhienne1Axayacatl Gonzalez2Stephen J. Trueman3Environmental Futures Research Institute, Griffith University, Nathan, QLD 4111, AustraliaSchool of Agriculture and Food Sciences, The University of Queensland, St. Lucia, QLD 4072, AustraliaAustralian Institute for Bioengineering and Nanotechnology, The University of Queensland, St. Lucia, QLD 4072, AustraliaEnvironmental Futures Research Institute, Griffith University, Nathan, QLD 4111, AustraliaThe potential of plant growth-promoting rhizobacteria (PGPR) to improve plant growth and nutrient acquisition has received increased attention. This study investigated the synergistic effects of combining PGPR <i>Paraburkholderia</i> sp. SOS3 with the addition of inorganic N fertilizer (iN) or a combined application of inorganic N with organic manure-based fertilizer (iNoN) at low and high levels of N fertilization on <i>Macadamia integrifolia</i> seedling growth. We studied plant growth, mineral N in soil-leachate, and media physicochemical and microbial characteristics. Growth of seedlings fertilized with iNoN at high N level (iNoN 100) was enhanced by PGPR inoculation, with an increase of 32% in total biomass and 43% in N uptake, compared with uninoculated seedlings. No significant PGPR effect was observed on growth under low or high inorganic N treatments but PGPR significantly reduced N leaching after 3 weeks of fertilization. We found a positive relationship between media and plant δ<sup>15</sup>N and plant N uptake, and a strong increase in microbial-biomass N under the most productive fertilization treatment (iNoN 100 with PGPR), compared with the other N treatments (without or with PGPR). The results suggest that PGPR improves N acquisition by reducing mineral N loss and increasing plant N availability, but that these effects depend on the N form and N level.https://www.mdpi.com/2073-4395/11/6/1064<i>Macadamia integrifolia</i>nitrogen sourceorganic fertilizer<i>Paraburkholderia</i>PGPRbiofertilizer |
| spellingShingle | Marta Gallart Chanyarat Paungfoo-Lonhienne Axayacatl Gonzalez Stephen J. Trueman Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i> Agronomy <i>Macadamia integrifolia</i> nitrogen source organic fertilizer <i>Paraburkholderia</i> PGPR biofertilizer |
| title | Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i> |
| title_full | Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i> |
| title_fullStr | Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i> |
| title_full_unstemmed | Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i> |
| title_short | Nitrogen Source Influences the Effect of Plant Growth-Promoting Rhizobacteria (PGPR) on <i>Macadamia integrifolia</i> |
| title_sort | nitrogen source influences the effect of plant growth promoting rhizobacteria pgpr on i macadamia integrifolia i |
| topic | <i>Macadamia integrifolia</i> nitrogen source organic fertilizer <i>Paraburkholderia</i> PGPR biofertilizer |
| url | https://www.mdpi.com/2073-4395/11/6/1064 |
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