Drought-avoidant soybean germplasm maintains nitrogen-fixation capacity under water stress

1996 ◽  
Vol 186 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Robert P. Patterson ◽  
Colleen M. Hudak
Keyword(s):  
Nitrogen Fixation ◽  
Water Stress ◽  
Soybean Germplasm ◽  
Fixation Capacity

Differential responses of the sunn4 and rdn1-1 super-nodulation mutants of Medicago truncatula to elevated atmospheric CO2

2021 ◽  
Author(s):  
Yunfa Qiao ◽  
Shujie Miao ◽  
Jian Jin ◽  
Ulrike Mathesius ◽  
Caixian Tang
Keyword(s):  
Nitrogen Fixation ◽  
Elevated Co2 ◽  
Medicago Truncatula ◽  
N2 Fixation ◽  
Sink Strength ◽  
Wild Type ◽  
Total N ◽  
Autoregulation Of Nodulation ◽  
Nodulation Mutants ◽  
Fixation Capacity

Abstract Background and Aims Nitrogen fixation in legumes requires tight control of carbon and nitrogen balance. Thus, legumes control nodule numbers via an autoregulation mechanism. ‘Autoregulation of nodulation’ mutants super-nodulate and are thought to be carbon-limited due to the high carbon-sink strength of excessive nodules. This study aimed to examine the effect of increasing carbon supply on the performance of super-nodulation mutants. Methods We compared the responses of Medicago truncatula super-nodulation mutants (sunn-4 and rdn1-1) and wild type to five CO2 levels (300-850 μmol mol -1). Nodule formation and N2 fixation were assessed in soil-grown plants at 18 and 42 days after sowing. Key results Shoot and root biomass, nodule number and biomass, nitrogenase activity and fixed-N per plant of all genotypes increased with increasing CO2 concentration and reached the maximum around 700 μmol mol -1. While the sunn-4 mutant showed strong growth-retardation compared to wild-type plants, elevated CO2 increased shoot biomass and total N content of rdn1-1 mutant up to two-fold. This was accompanied by a four-fold increase in nitrogen fixation capacity in the rdn1-1 mutant. Conclusions These results suggest that the super-nodulation phenotype per se did not limit growth. The additional nitrogen fixation capacity of the rdn1-1 mutant may enhance the benefit of elevated CO2 on plant growth and N2 fixation.

scholarly journals Improvement in nitrogen fixation capacity could be part of the domestication process in soybean

Heredity ◽  
2016 ◽  
Vol 117 (2) ◽  
pp. 84-93 ◽  
Author(s):  
N Muñoz ◽  
X Qi ◽  
M-W Li ◽  
M Xie ◽  
Y Gao ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Fixation Capacity ◽  
Domestication Process

Phoma medicaginis colonizes Medicago truncatula root nodules and affects nitrogen fixation capacity

2014 ◽  
Vol 141 (2) ◽  
pp. 375-383 ◽  
Author(s):  
Saif-Allah Chihaoui ◽  
Naceur Djébali ◽  
Moncef Mrabet ◽  
Fathi Barhoumi ◽  
Ridha Mhamdi ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Medicago Truncatula ◽  
Root Nodules ◽  
Phoma Medicaginis ◽  
Fixation Capacity

Registration of soybean germplasm lines R10‐2436 and R10‐2710 with drought tolerance traits and high yield under moderate water stress

2020 ◽  
Vol 14 (2) ◽  
pp. 189-196
Author(s):  
Pedro Manjarrez‐Sandoval ◽  
Pengyin Chen ◽  
Leandro Mozzoni ◽  
Liliana Florez‐Palacios ◽  
Moldir Orazaly ◽  
...  
Keyword(s):  
Water Stress ◽  
Drought Tolerance ◽  
High Yield ◽  
Soybean Germplasm

Role of Potassium on Growth, Nitrogen Fixation and Biochemical Traits in [Vigna radiata (L.) Wilczek] under Water Stress

2020 ◽  
Author(s):  
Nisha Kataria ◽  
Narender Singh
Keyword(s):  
Nitrogen Fixation ◽  
Water Stress ◽  
Potassium Fertilizer ◽  
Biochemical Traits ◽  
Global Issue ◽  
Wide Range ◽  
Negative Effect ◽  
Potassium Supply ◽  
Effects Of Drought

Background: Water stress is a global issue to ensure survival of agricultural crops. Mungbean has a great nutritional value, short-duration and has an advantage that it can grow in wide range of soils and environments. For the present study, two varieties of mungbean were selected and raised in earthen pots. Methods: Water stress was imposed at 50% flowering (35-40 days after sowing) and plants were sampled at this stage. The control plants maintained at soil moisture content (SMC) of 12.0 ± 0.5% and in stressed plants, water stress was created by withholding irrigation till SMC decreased to 4.5±0.5%. In legumes, damaging effects of drought can be reduced by potassium supply. Potassium was supplied to the soil at concentration 0.00, 1.54 mM, 2.31 mM, 3.08 mM. Result: This article includes water stress-induced harmful effects on mungbean growth and development, nitrogen fixation and biochemical traits and suggests that different concentrations of potassium fertilizer help to reduce the negative effect of water stress.

Registration of Soybean Germplasm Lines R01-416F and R01-581F for Improved Yield and Nitrogen Fixation under Drought Stress

2007 ◽  
Vol 1 (2) ◽  
pp. 166-167 ◽  
Author(s):  
P. Chen ◽  
C. H. Sneller ◽  
L. C. Purcell ◽  
T. R. Sinclair ◽  
C.A. King ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Drought Stress ◽  
Soybean Germplasm

Evaluation of Biological Nitrogen Fixation Capacity in Arachis Species and the Possible Role of Polyploidy1

1994 ◽  
Vol 21 (1) ◽  
pp. 55-60 ◽  
Author(s):  
H. T. Stalker ◽  
M. L. Nickum ◽  
J. C. Wynne ◽  
G. H. Elkan ◽  
T. J. Schneeweis
Keyword(s):  
Nitrogen Fixation ◽  
Arachis Hypogaea ◽  
Cover Crops ◽  
Biological Nitrogen Fixation ◽  
Nitrogenase Activity ◽  
Diploid Species ◽  
Dry Matter Accumulation ◽  
Arachis Species ◽  
Fixation Capacity ◽  
Biological Nitrogen

Abstract Arachis species have potential for enhancing cultivated peanut (Arachis hypogaea L.) germplasm as forages and cover crops. This study's objective was to evaluate a range of Arachis species for biological nitrogen fixation capacity. Several Arachis species are tetraploids, and it has been shown that tetraploidy may play an important role in nodule initiation. Species were first tested under natural field conditions and then in the greenhouse using three Bradyrhizobium strains that had been previously shown to be effective on peanut. Nodule number, nodule weight, nitrogenase activity determined by acetylene reduction, and shoot dry weight were measured as indicators of nitrogen fixation capacity. In the field, tetraploid species produced significantly more nodules than the diploids, but total dry matter accumulation was independent of the number of nodules or rate of fixation. In the greenhouse, no significant differences were observed among the bradyrhizobial strains. Arachis hypogaea and A. monticola showed significantly higher measures of nitrogen fixation capacity for all measured traits than the diploid species. However, autotetraploid plants of A. villosa did not have significantly more nodules than diploids of the same accession; the autotetraploids consistently had higher nitrogenase activity. Arachis pusilla never formed a symbiotic relationship with the bradyrhizobial strains used.

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