Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica
Global climate change and local anthropogenic activities are increasing soil salinization with permanent negative effects on agricultural and ecosystem productivity. While salt stress is known to affect plant performance, its effects on the association with key microbial plant symbionts, such as le...
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Julius Kühn-Institut
2018-11-01
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doaj-ac483ea4d39c49ab8ab77b0a7404d8262021-03-02T09:12:23ZengJulius Kühn-InstitutJournal of Applied Botany and Food Quality1613-92161439-040X2018-11-019110.5073/JABFQ.2018.091.0398998Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa RicaDaniel J Ballhorn0Emily R WolfeJess TylerWren RonanScott Sands-GounerCurran ShawMehmet A BalkanStefanie KautzPortland State University Global climate change and local anthropogenic activities are increasing soil salinization with permanent negative effects on agricultural and ecosystem productivity. While salt stress is known to affect plant performance, its effects on the association with key microbial plant symbionts, such as legume-associated nitrogen-fixing rhizobia, are less understood. In this field study conducted in Costa Rica (Puntarenas), we used sympatrically-occurring wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium to quantify biomass production of unfertilized rhizobial (R+) and fertilized rhizobia-free (R-) plants at different levels of experimentally manipulated salinity in native soil. In response to salt stress, nodulation was significantly reduced even at slightly increased salt levels. Plants growing at soil salinity levels of 2, 4, 6, and 8 mS/cm showed a mean reduction of nodules by 60.22, 76.52, 83.98, and 92.5% compared to the controls. Similarly, we also observed a significant decline in plant biomass at elevated salinity. However, biomass accumulation of R- plants was significantly less impacted compared to R+ plants, suggesting that the plant-microbe symbiosis is more salt-sensitive than the plant host itself. We suggest that the search for more salt-tolerant, crop plant-compatible rhizobial strains may provide a sustainable approach to maintain agricultural productivity on low to moderately saline soils. https://ojs.openagrar.de/index.php/JABFQ/article/view/8998 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Daniel J Ballhorn Emily R Wolfe Jess Tyler Wren Ronan Scott Sands-Gouner Curran Shaw Mehmet A Balkan Stefanie Kautz |
spellingShingle |
Daniel J Ballhorn Emily R Wolfe Jess Tyler Wren Ronan Scott Sands-Gouner Curran Shaw Mehmet A Balkan Stefanie Kautz Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica Journal of Applied Botany and Food Quality |
author_facet |
Daniel J Ballhorn Emily R Wolfe Jess Tyler Wren Ronan Scott Sands-Gouner Curran Shaw Mehmet A Balkan Stefanie Kautz |
author_sort |
Daniel J Ballhorn |
title |
Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica |
title_short |
Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica |
title_full |
Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica |
title_fullStr |
Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica |
title_full_unstemmed |
Quantitative effects of soil salinity on the symbiosis of wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium in Costa Rica |
title_sort |
quantitative effects of soil salinity on the symbiosis of wild lima bean (phaseolus lunatus l.) and bradyrhizobium in costa rica |
publisher |
Julius Kühn-Institut |
series |
Journal of Applied Botany and Food Quality |
issn |
1613-9216 1439-040X |
publishDate |
2018-11-01 |
description |
Global climate change and local anthropogenic activities are increasing soil salinization with permanent negative effects on agricultural and ecosystem productivity. While salt stress is known to affect plant performance, its effects on the association with key microbial plant symbionts, such as legume-associated nitrogen-fixing rhizobia, are less understood. In this field study conducted in Costa Rica (Puntarenas), we used sympatrically-occurring wild lima bean (Phaseolus lunatus L.) and Bradyrhizobium to quantify biomass production of unfertilized rhizobial (R+) and fertilized rhizobia-free (R-) plants at different levels of experimentally manipulated salinity in native soil. In response to salt stress, nodulation was significantly reduced even at slightly increased salt levels. Plants growing at soil salinity levels of 2, 4, 6, and 8 mS/cm showed a mean reduction of nodules by 60.22, 76.52, 83.98, and 92.5% compared to the controls. Similarly, we also observed a significant decline in plant biomass at elevated salinity. However, biomass accumulation of R- plants was significantly less impacted compared to R+ plants, suggesting that the plant-microbe symbiosis is more salt-sensitive than the plant host itself. We suggest that the search for more salt-tolerant, crop plant-compatible rhizobial strains may provide a sustainable approach to maintain agricultural productivity on low to moderately saline soils.
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url |
https://ojs.openagrar.de/index.php/JABFQ/article/view/8998 |
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