נגישות
menu      
Advanced Search
Syntax
Search...
Volcani treasures
About
Terms of use
Manage
Community:
אסיף מאגר המחקר החקלאי
Powered by ClearMash Solutions Ltd -
Soil nitrogen regulates symbiotic nitrogen fixation in a legume shrub but does not accumulate under it
Year:
2021
Source of publication :
ECOSPHERE
Authors :
Dovrat, Guy
;
.
Volume :
Co-Authors:

Moshe Alon,
Guy Dovrat,
Tania Masci,
Efrat Sheffer

Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:

Legumes in dryland ecosystems face the challenge of maintaining energetically costly symbiosis with N2-fixing rhizobia, in a water- and nutrient-limited environment. Controlled experiments showed a strong reduction in symbiotic N2 fixation in response to elevated levels of nitrogen availability, but this regulation of N2 fixation was not found in dryland field settings. Here, we ask whether regulation of N2 fixation occurs in the field and what are the possible consequences for dryland soil nitrogen. We measured plant investment in root nodules and rates of bacterial activity, in seedlings and adults of a common N2-fixing shrub, Calicotome villosa, in five field sites naturally varying in soil nitrogen and phosphorus availabilities. Additionally, we measured nitrogen concentrations and availabilities in the soil under Cvillosa and a reference non-fixing shrub. Biomass investment in root nodules was significantly reduced in response to elevated levels of soil nitrate in adult shrubs, but no such effect was found for seedlings. Soil nitrogen concentration under Cvillosa shrubs was low compared to the soil under a non-fixing reference shrub. We provide evidence that symbiotic N2-fixing plants in drylands tightly regulate their investment in symbiotic N2 fixation, therefore controlling nitrogen inputs into the soil. These findings challenge the long-held notion that the growth of N2-fixing plants necessarily leads to the accumulation of soil nitrogen in their surroundings over time.

Note:
Related Files :
legume
nitrogen fixation
shrub
soil nitrogen
Show More
Related Content
More details
DOI :
10.1002/ecs2.3843
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
57890
Last updated date:
02/03/2022 17:27
Creation date:
13/02/2022 16:38
Scientific Publication
Soil nitrogen regulates symbiotic nitrogen fixation in a legume shrub but does not accumulate under it

Moshe Alon,
Guy Dovrat,
Tania Masci,
Efrat Sheffer

Soil nitrogen regulates symbiotic nitrogen fixation in a legume shrub but does not accumulate under it

Legumes in dryland ecosystems face the challenge of maintaining energetically costly symbiosis with N2-fixing rhizobia, in a water- and nutrient-limited environment. Controlled experiments showed a strong reduction in symbiotic N2 fixation in response to elevated levels of nitrogen availability, but this regulation of N2 fixation was not found in dryland field settings. Here, we ask whether regulation of N2 fixation occurs in the field and what are the possible consequences for dryland soil nitrogen. We measured plant investment in root nodules and rates of bacterial activity, in seedlings and adults of a common N2-fixing shrub, Calicotome villosa, in five field sites naturally varying in soil nitrogen and phosphorus availabilities. Additionally, we measured nitrogen concentrations and availabilities in the soil under Cvillosa and a reference non-fixing shrub. Biomass investment in root nodules was significantly reduced in response to elevated levels of soil nitrate in adult shrubs, but no such effect was found for seedlings. Soil nitrogen concentration under Cvillosa shrubs was low compared to the soil under a non-fixing reference shrub. We provide evidence that symbiotic N2-fixing plants in drylands tightly regulate their investment in symbiotic N2 fixation, therefore controlling nitrogen inputs into the soil. These findings challenge the long-held notion that the growth of N2-fixing plants necessarily leads to the accumulation of soil nitrogen in their surroundings over time.

Scientific Publication
You may also be interested in