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Vadez, Vincent; Lasso, Jesus H.; Beck, D. P.; Drevon, J. J.

doi:10.1023/a:1003512519558

Cited by 94 publications

(11 citation statements)

References 25 publications

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“…Not only was this hypothesis clearly confirmed for both Medicago species in association with their own compatible rhizobia, this general trend was also valid for both mycorrhizal and NM plants ( Figure 5 ). These results confirmed previous observations (Ankomah et al, 1996; Vadez et al, 1999; Kuang et al, 2005) made with different leguminous plant species, although the range of environmental conditions (such as P availabilities) was usually more restricted in the previously published case studies than in our current research. Duplication of BNF efficiency due to massive P-fertilization in a mixed clover–grass sward was previously reported from a mesocosm experiment by Edwards et al (2006).…”

Section: Discussionsupporting

confidence: 93%

Arbuscular Mycorrhiza Stimulates Biological Nitrogen Fixation in Two Medicago spp. through Improved Phosphorus Acquisition

et al. 2017

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Legumes establish root symbioses with rhizobia that provide plants with nitrogen (N) through biological N fixation (BNF), as well as with arbuscular mycorrhizal (AM) fungi that mediate improved plant phosphorus (P) uptake. Such complex relationships complicate our understanding of nutrient acquisition by legumes and how they reward their symbiotic partners with carbon along gradients of environmental conditions. In order to disentangle the interplay between BNF and AM symbioses in two Medicago species (Medicago truncatula and M. sativa) along a P-fertilization gradient, we conducted a pot experiment where the rhizobia-treated plants were either inoculated or not inoculated with AM fungus Rhizophagus irregularis ‘PH5’ and grown in two nutrient-poor substrates subjected to one of three different P-supply levels. Throughout the experiment, all plants were fertilized with 15N-enriched liquid N-fertilizer to allow for assessment of BNF efficiency in terms of the fraction of N in the plants derived from the BNF (%NBNF). We hypothesized (1) higher %NBNF coinciding with higher P supply, and (2) higher %NBNF in mycorrhizal as compared to non-mycorrhizal plants under P deficiency due to mycorrhiza-mediated improvement in P nutrition. We found a strongly positive correlation between total plant P content and %NBNF, clearly documenting the importance of plant P nutrition for BNF efficiency. The AM symbiosis generally improved P uptake by plants and considerably stimulated the efficiency of BNF under low P availability (below 10 mg kg-1 water extractable P). Under high P availability (above 10 mg kg-1 water extractable P), the AM symbiosis brought no further benefits to the plants with respect to P nutrition even as the effects of P availability on N acquisition via BNF were further modulated by the environmental context (plant and substrate combinations). As a response to elevated P availability in the substrate, the extent of root length colonization by AM fungi was reduced, the turning points occurring at about 8 and 10 mg kg-1 water extractable P for M. sativa and M. truncatula, respectively. Our results indicated competition for limited C resource between the two kinds of microsymbionts and thus degradation of AM symbiotic functioning under ample P supply.

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Section: Discussionsupporting

confidence: 93%

Arbuscular Mycorrhiza Stimulates Biological Nitrogen Fixation in Two Medicago spp. through Improved Phosphorus Acquisition

et al. 2017

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“…Most NUE studies have been conducted in cereals crops. Very few such studies have been conducted in legumes (Vadez et al 1999;Dorcinvil et al 2010;Rotundo et al 2014), presumably because legumes obtain some of their N from the atmosphere through biological N 2 fixation. Vadez et al (1999) reported that dry bean lines with high NUE that had been inoculated with Rhizobium leguminosarum biovar phaseoli produced more root and shoot biomass than inefficient genotypes.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen use efficiency of irrigated dry bean (Phaseolus vulgaris L.) genotypes in southern Alberta

2017

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Although dry bean (Phaseolus vulgaris L.) is a legume capable of fixing nitrogen, fertilizer N is usually recommended for its production in Canada because it is believed to be an inefficient N fixer. Using genotypes with high N use efficiency (NUE) would reduce the amount of applied N, which usually has deleterious environmental effects. We evaluated 22 bean genotypes for N uptake efficiency (NUpE) in a greenhouse trial and 16 genotypes for N use efficiency (NUE) and its components: NUpE and N utilization efficiency (NUtE) in two seasons (2012 and 2013) of a field trial at 30 kg N ha −1 (30N) and 100 kg N ha −1 (100N) soil levels. Root biomass and surface area were highly correlated with NUpE in the greenhouse, where NUpE at 100N was 48% lower than that at 30N. In the field trial, grain yield was highly correlated with NUpE and NUtE at both 30N and 100N. The NUpE at 100N was 65% lower than that at 30N, and NUE at 100N was 68% lower than that at 30N. The low NUE at 100N in the field trial was mainly due to the difference in NUpE. This study also identified nine genotypes, including five germplasm lines (PI 136692, GH-196, UNS-117, UI-239, and LEF2RB) and four cultivars (Othello, Viva, AC Redbond, and Island), that were both N-efficient (at 30N) and N-responsive (to 100N).

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“…For example, Yan et al (1995a) reported signiWcant variation among bean genotypes, which was heritable, for vegetative growth under low soil P availability. Vadez et al (1999) reported that low soil P tolerant genotypes were more prevalent among late Xowering germplasm. Christiansen and Graham (2002) reported that genotypes with enhanced shoot dry weight (SDW) had better growth rate and displayed soil P-stress tolerance response mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Combining ability analysis across environments for some traits in dry bean (Phaseolus vulgaris L.) under low and high soil phosphorus conditions

Kimani

Derera

2008

Euphytica

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Dry bean (Phaseolus vulgaris L.) is an important grain legume for small-scale farmers in eastern Africa who nonetheless, grow beans with limited phosphorus (P) fertilizer supply or none at all. Phosphorus rank second, after nitrogen (N), as the most limiting soil nutrient in bean production in East African soils. This study was conducted to determine combining ability for Wve polygenic traits in the red mottled, large seeded bean market class, under low and high soil P conditions and two locations. Three parents tolerant to low soil P were hybridized with Wve well adapted, but non-low P tolerant lines in a diallel mating scheme. The resulting 28 F 1 hybrids were evaluated in a randomized complete block design with three replications, under low and high soil P conditions at two sites. There were highly signiWcant (P · 0.001) diVerences among the genotypes for all the traits under all the study conditions. The GCA mean squares were highly signiWcant (P · 0.001) for these traits, indicating importance of additive eVects for both study conditions and sites. The GCA £ Environment and SCA £ Environment were signiWcant for all the parameters and test conditions. CAL143 had positive GCA eVects that were signiWcant; except for 100-seed weight under P stress; for all the traits and under all the study conditions. The negative GCA eVects for the none P tolerant parents indicate that they impacted positively in imparting earliness.

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Cited by 94 publications

References 25 publications

Arbuscular Mycorrhiza Stimulates Biological Nitrogen Fixation in Two Medicago spp. through Improved Phosphorus Acquisition

Arbuscular Mycorrhiza Stimulates Biological Nitrogen Fixation in Two Medicago spp. through Improved Phosphorus Acquisition

Nitrogen use efficiency of irrigated dry bean (Phaseolus vulgaris L.) genotypes in southern Alberta

Combining ability analysis across environments for some traits in dry bean (Phaseolus vulgaris L.) under low and high soil phosphorus conditions

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