The French Mediterranean Zones: Sheep Rearing Systems and the Present and Potential Role of Pasture Legumes

Gintzburger, G.; Rochon, J. J.; Conesa, A.

doi:10.1007/978-94-009-1019-5_16

Cited by 3 publications

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“…Annual Medicago species (or medics) are well agement and pasture reseeding in the French Mediterranean area [2]. For this region (Provence-C8te d'Azur, Languedoc-Roussillon and Gorse), five main and ubiquitous medic species (Me&cngc-, PO/V morpha, M. truncatula, M. rigidula.…”

Section: Introductionmentioning

confidence: 99%

Comparison of nucleotide diversity and symbiotic properties of Rhizobium meliloti populations from annual Medicago species

Brunel

1996

FEMS Microbiology Ecology

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Forty-three isolates of Rhizobi~nz meliloti were trapped from soil with five annual species of Medicago (M. polymorpha, M. truncatula, M. rigidula, M. orbicularis and M. minima) and one perennial species of Medicago (M. satiua). The annual species were growing naturally near the soil sampling site, and the commonly studied perennial species was used for comparison. Each R. rneliloti was characterized by PCR-RFLP methods applied to two DNA regions nested between 16s rRNA and 23s rRNA genes and between nifD and nifK genes. They fell into two highly divergent groups (groups I and II), separated at a genetic distance of 0.024 by rDNA-amplified pattern analysis (profiles RI and R2) and at 0.029 by nif-amplified pattern analysis (profiles Nl-N2 and N3). These two groups were consistent with some cross-nodulation and -fixation results: rhizobia with the Rl genetic background elicited rudimentary nodules and could not fix nitrogen on M. po[ymorpha, while they were able to nodulate the five other species of Medicago. In contrast, rhizobia with an R2 profile were highly effective on M. polymorpha and poorly nodulated M. rigidula species, but were able to nodulate efficiently the other species. The striking phenotypic traits on M. polymorpha were also shared by reference strains: strains genetically closed to R2 type triggered typical and efficient nodules on M. polymorpha while those close to Rl type elicited rudimentary and non-efficient ones. Our results suggest that the presence of R. meliloti with R2 genetic backgrounds could be favoured by the distribution of M. polymorpha species.adapted and native to areas in the Mediterranean basin [I]. They are excellent candidates for use in sustainable agriculture systems such as forage and cover crops, and are promising for rangeland man-0168-6496/96/$15.00 0 1996 Federation of European Microbiological Societies. All rights reserved SSDI 0168-6496(95)00076-3

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Section: Introductionmentioning

confidence: 99%

Comparison of nucleotide diversity and symbiotic properties of Rhizobium meliloti populations from annual Medicago species

Brunel

1996

FEMS Microbiology Ecology

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The South African perennial legume Lebeckia ambigua sustainably supports livestock production on infertile soils in rain-fed agro-ecosystems

Howieson

Edwards

Harrison

et al. 2021

Agron. Sustain. Dev.

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Lebeckia ambigua is a perennial legume endemic to rangeland South Africa that is adapted to dry (< 400-mm annual rainfall), infertile and acidic (below pH 5.5 Ca ) soils. Although it is considered that the legume was grazed by mammalian ungulates during its evolution, little is known about its production, nutritive value for grazing animals or optimal management in an agricultural context, in either its centre of the origin or in Australia. Experiments were conducted to test the hypotheses that sheep would graze L. ambigua in autumn without adverse effects on either the animal or the plant. Lebeckia ambigua was established at two sites in Western Australia. In experiment 1, three grazing intensities were imposed by exclusion cages introduced during a single intensive grazing period, to provide differing residual pasture heights. The metabolisable energy and crude protein content of L. ambigua were more than 11.4 MJ/kg dry matter and 21%, respectively for all treatments. Un-grazed L. ambigua produced 1740 kg DM/ha while a single moderate or severe grazing reduced total biomass production by about 50% over 10 weeks post-grazing (P < 0.001). In experiment 2, continuous grazing of L. ambigua for 64 days had no negative impacts on biochemical health indicators of merino wethers. Grazing had no effect on plant density in either experiment indicating that L. ambigua is adapted to substantial grazing pressure in autumn. Lebeckia ambigua could become a valuable plant for sustainably increasing livestock production on infertile soils in rain-fed agro-ecosystems where other legumes fail.

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Nitrogen fixation and growth of annual Medicago–Sinorhizobium associations at low temperature

Robin¹,

Sultan-Tubeileh²,

Obaton³

et al. 2005

European Journal of Agronomy

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The French Mediterranean Zones: Sheep Rearing Systems and the Present and Potential Role of Pasture Legumes

Cited by 3 publications

References 1 publication

Comparison of nucleotide diversity and symbiotic properties of Rhizobium meliloti populations from annual Medicago species

Comparison of nucleotide diversity and symbiotic properties of Rhizobium meliloti populations from annual Medicago species

The South African perennial legume Lebeckia ambigua sustainably supports livestock production on infertile soils in rain-fed agro-ecosystems

Nitrogen fixation and growth of annual Medicago–Sinorhizobium associations at low temperature

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