scholarly journals Biological Nitrogen Fixation, Carbon assimilation and plant performance of Lotus tenuis, contribute to define a strategic role in the lowlands in the Salado River Basin (Argentina)

2021 ◽  
Author(s):  
MARIA PAULA CAMPESTRE ◽  
CRISTIAN JAVIER ANTONELLI ◽  
MATIAS ANDRES BAILLERES ◽  
VANINA GISELLE MAGUIRE ◽  
MIGUEL ANGEL TABOADA ◽  
...  
Keyword(s):  
River Basin ◽  
Carbon Assimilation ◽  
B Value ◽  
Plant Performance ◽  
Weed Species ◽  
Lotus Tenuis ◽  
Marginal Soils ◽  
Strategic Role ◽  
Salado River ◽  
Biological Nitrogen

Abstract Background and AimsForage production constitutes a great challenge for the Salado River Basin (Argentina), the major area devoted to livestock in the country. The successful naturalization of the European legume Lotus tenuis has been a productive and environmental relevance for the region. This study aims to evaluate its strategic contribution, reporting for the first time the B value for this species in these marginal environments for agriculture.MethodsThe 15N natural abundance method was used to evaluate the BNF of L. tenuis at soil plots and non-leguminous weed species in the same plots were utilized as reference plants. The assays included determinations of the 13C isotope, as well. Simultaneously, evaluations were carried out in the greenhouse for the determination of the B value of L. tenuis and the relative reproducibility of the field experiments.ResultsThe results obtained demonstrated that the L. tenuis promotion is accompanied by an increase in forage quality, due to the predominance of this C3 legume species, over C4 species. Moreover, its contribution to N inputs to the system, through the BNF with native rhizobia demonstrated to be about 80%, a highly relevant percentage for these constrained agroecosystems.ConclusionsThis work supports the hypothesis that L. tenuis promotion plays a strategic role in the sustainability of the ecosystem, especially in soil constrained areas. Joined with data previously published, the results obtained contribute to support the criteria that define the naturalized legume playing a strategic role in the sustainability of agriculture marginal soils.

Comparative Taphonomy of Mollusk Assemblages in Quaternary Freshwater Sequences from the Salado River Basin, Buenos Aires

Ameghiniana ◽  
2018 ◽  
Vol 55 (2) ◽  
pp. 197-209 ◽  
Author(s):  
M. Florencia Pisano ◽  
Nicole N. Pommáres ◽  
Mariel S. Luengo ◽  
Enrique E. Fucks
Keyword(s):  
River Basin ◽  
Buenos Aires ◽  
Salado River ◽  
Mollusk Assemblages

The Quequén Salado river basin: Geology and biochronostratigraphy of the Mio-Pliocene boundary in the southern Pampean plain, Argentina

2017 ◽  
Vol 76 ◽  
pp. 362-374 ◽  
Author(s):  
E. Beilinson ◽  
G.M. Gasparini ◽  
R.L. Tomassini ◽  
M.A. Zárate ◽  
C.M. Deschamps ◽  
...  
Keyword(s):  
River Basin ◽  
Pampean Plain ◽  
Salado River

Heavy Metal Pollution and Eutrophication in the Lower Salado River Basin (Argentina)

2006 ◽  
Vol 178 (1-4) ◽  
pp. 335-349 ◽  
Author(s):  
A. M. Gagneten ◽  
S. Gervasio ◽  
J. C. Paggi
Keyword(s):  
Heavy Metal ◽  
River Basin ◽  
Metal Pollution ◽  
Heavy Metal Pollution ◽  
Salado River

scholarly journals LOTUS spp: BIOTECHNOLOGICAL STRATEGIES TO IMPROVE THE BIOECONOMY OF LOWLANDS IN THE SALADO RIVER BASIN (ARGENTINA)

AGROFOR ◽  
2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Cristian J. ANTONELLI ◽  
Pablo I. CALZADILLA ◽  
Francisco J. ESCARAY ◽  
María F. BABUIN ◽  
María P. CAMPESTRE ◽  
...  
Keyword(s):  
River Basin ◽  
Land Surface ◽  
Agronomic Traits ◽  
Ghg Emissions ◽  
Solid Base ◽  
Forage Production ◽  
Livestock Breeding ◽  
Legume Production ◽  
Salado River ◽  
The Impact

The Salado River Basin region is the most important livestock breeding area inArgentina, wherethe Lotus species has been traditionally cultivated as forages.Nearly 60% of their land surface is dominated by salt-affected soils with severeconstraints for crop cultivation. In order to cope with that limitation, farmers haveutilized species such as non-native L. tenuis (ex- Lotus glaber), which shows a verygood adaptation. As a result, inter-seeding of L. tenuis has been proposed as astrategy of choice for improving forage production in marginal areas. The increasein soil quality by these means is achieved by an increment of the organic mattercontent, improvement of soil fertility as well as microbial biodiversity. Thus, theintroduction of L. tenuis and/or other Lotus genotypes could have enormousbenefits for similar constrained lands around the world. We are developing anintegrated analysis of the changes that occur in soils under legume production. Wewill not only analyze the microbial diversity associated, but also soil physical andchemical characteristics and the impact of different legume-microbes associationon mitigation of GHG emissions. In addition, we are identifying the main geneticdeterminants associated with interesting agronomic traits such as plant toleranceagainst biotic and abiotic stresses and the content of condensed tannins. Our futureand present research will build a solid base for the improvement of agronomicallyimportantspecies and the development of better strategies for the management ofconstrained lands such as the lowlands in the Argentinean Pampas.

scholarly journals Over-expression of the brassinosteroid gene TaDWF4 increases wheat productivity under low and sufficient nitrogen through enhanced carbon assimilation

2021 ◽  
Author(s):  
Matthew John Milner ◽  
Stéphanie M. Swarbreck ◽  
Melanie Craze ◽  
Sarah Bowden ◽  
Howard Griffiths ◽  
...  
Keyword(s):  
Crop Yields ◽  
Agronomic Traits ◽  
Carbon Assimilation ◽  
Fold Increase ◽  
Operating Efficiency ◽  
Over Expression ◽  
Rate Limiting Step ◽  
Marginal Soils ◽  
Use Efficiency ◽  
Rate Limiting

There is a strong pressure to reduce nitrogen (N) fertiliser inputs while maintaining or increasing current cereal crop yields. Brassinosteroids, (BR), are a group of phytohormones essential for plant growth and development, that have been demonstrated to regulate several agronomic traits. DWF4 encodes a cytochrome P450 that catalyses a rate-limiting step in BR synthesis. We show that overexpression of the dominant shoot expressed homoeologue TaDWF4-B in wheat can increase plant productivity by up to 105% under a range of N levels on marginal soils, resulting in increased N use efficiency (NUE). We show that a two to four-fold increase in TaDWF4 transcript levels enhances the responsiveness of genes regulated by N. The productivity increases seen were primarily due to the maintenance of photosystem II operating efficiency and carbon assimilation in plants when grown under limiting N conditions and not an overall increase in photosynthesis capacity. The increased biomass production and yield per plant in TaDWF4 OE lines could be linked to modified carbon partitioning and changes in expression pattern of the growth regulator Target Of Rapamycin, offering a route towards breeding for sustained yield and lower N inputs.

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