Rhizosphere carboxylates and morphological root traits in pasture legumes and grasses

Kidd, Daniel; Ryan, Megan H.; Haling, Rebecca E.; Lambers, Hans; Sandral, Graeme; Yang, Zuguang; Culvenor, R. A.; Cawthray, Gregory R.; Stefanski, Adam; Simpson, Richard J.

doi:10.1007/s11104-015-2770-4

Cited by 49 publications

(58 citation statements)

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“…Until recently, there have been few studies of the root systems of species used in southern Australian pastures. Recent studies have investigated root morphology traits of pasture species that explain clear differences in their phosphorus (P) acquisition capacities Hill et al 2010;Kidd et al 2015;Ryan et al 2016;Yang et al 2015). Physiological mechanisms associated with P acquisition, namely exudation of low-molecular weight organic anions (carboxylates), have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Physiological mechanisms associated with P acquisition, namely exudation of low-molecular weight organic anions (carboxylates), have also been investigated. For instance, Kidd et al (2015) examined 16 current and novel pasture legumes and found that the most abundant carboxylates from roots were citrate and malonate. However, while it seems that pasture legumes commonly exude carboxylates, their role in nutrient acquisition is unclear.…”

Section: Introductionmentioning

confidence: 99%

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The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

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Low-molecular-weight organic anions (carboxylates) influence rhizosphere processes and may enhance plant phosphorus acquisition. We examined the root exudate profile of a range of pasture and grain legumes and focused on the little-investigated carboxylate, citramalate. Methods Twelve species of pasture legumes and herbs, including four Lotus spp. and two crop legumes, Cicer arietinum and Lupinus albus, were grown in a glasshouse for six weeks. The composition and amounts of carboxylates were measured in rhizosheath soil as well as in root exudates from roots washed free of their rhizosheath. Results Citrate and malate were found in the rhizosheath of all species. However, citramalate was present in the rhizosheath of only Lotus species (10-82% of total exuded carboxylates). Cicer arietinum had the largest amount of carboxylates in its rhizosheath and fastest rate of carboxylate exudation into the trap solution. Conclusions Citrate and malate were found in the rhizosheath of all species in this study, but citramalate was only found in the root exudates and rhizosheath of Lotus spp. Further investigation into the role of citramalate in Lotus spp. is merited.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

et al. 2018

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“…Comparative studies of the root morphology and 445 P-acquisition attributes of Ornithopus spp. (which have relatively long root hairs and are able 446 to achieve equivalent maximum shoot yields to T. subterraneum, but with substantially lower 447 rates of applied P), indicate that the short root hairs of T. subterraneum limit the P acquisition 448 capacity of the clover(Haling et al 2016b;Kidd et al 2016; Yang et al 2017). However, 449 presently root hair lengths have only been reported for a limited range of clover lines and a 450 wider survey to define the extent of intra-specific variation in root hair lengths among T. 451 subterraneum genotypes is warranted.…”

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Differences in nutrient foraging among Trifolium subterraneum cultivars deliver improved P-acquisition efficiency

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1617 18 root length density in the topsoil but those that yielded relatively well did so by maintaining a 36 large root hair cylinder volume (i.e. they explored more soil) under low soil P conditions. This 37 was associated with maintenance of dry matter allocations to topsoil roots and higher specific 38 root lengths. Both factors assisted development of high root length density for nutrient 39 foraging. Root acclimation responses to P were compared among the cultivars at equivalent 40 relative shoot yields to assess the influence of plant P stress as a trigger for nutrient foraging. 41 3 The least P-efficient cultivars slowed their allocation of dry matter to foraging roots at lower 42 levels of P stress. 43 Conclusions 44The results suggest variation within T. subterraneum for root proliferation and specific root 45 length could be targeted in breeding for improved P-acquisition efficiency. 46 47

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“…In contrary, Maseko and Dakora (2013) have reported that legumes secrete more phosphatase enzymes than cereal which might be explained by a higher requirement of P by legumes in the symbiotic nitrogen fixation process. The amount of acid phosphatase exuded by plant roots has been shown to differ between crop species and varieties (Kidd et al, 2016).…”

Section: Plants Improve Soil Biological Activitiesmentioning

confidence: 99%

Effect of maize and peanut crops on Ivory Coast northern soil biological activities and their response to arbuscular mycorrhizal fungi inoculation

Koffi¹,

Ndoye²,

Dabonne³

et al. 2018

Afr. J. Microbiol. Res.

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The overuse of chemical fertilizers in agriculture remains an environmental concern, especially in sub-Saharan areas of Africa where soil degradation lead to low crop yield. Crop inoculation with beneficial microorganisms appears a good alternative to reduce chemical substances and improve yield. In this regard, studies on soil biological activities and inoculation experiments on maize (Zea mays L.) and peanut (Arachis hypogaea L.) crops were conducted. The aim of this work was to evaluate the effect of these crops on soil microbial activities and to assess their response to inoculation with two fungi (Glomus aggregatum and Glomus etunicatum) alone or in combination. Rhizospheric and non rhizospheric soils were collected in peanut and maize fields at Takali in northern Côte d'Ivoire. Soil enzymes activities, total microbial biomass, AMF spore and rhizobia densities were determined in these soils. Then, mycorrhizal inoculation experiment of these plant species was conducted in a greenhouse located at Nangui Abrogoua University, Abidjan, Côte d'Ivoire. After three months, plant growth and yield, mycorrhizal and nodulation parameters were measured. Results showed that maize has significantly improved enzymes activities, spore density and total microbial biomass of soil. Effect of peanut was only significant on chitinase. Moreover, soil rhizobia density was reduced under this crop effect. Maize significantly improved these parameters more than peanut. Inoculation results showed a significant enhancement of the height and shoot dry weight of maize with single inoculation with G. aggregatum or G. etunicatum even if a low mycorrhization rate was observed. However, in peanut, the mixed inoculants (G. aggregatum + G. etunicatum) significantly increased the pod weight and nodulation parameters. Results showed the importance of plant cover in the improvement of soil biological quality including enzymes activities and microbial community and suggested that the effect of mycorrhizal inoculation is influenced by many factors as plant species, AMF and soil environment characteristics.

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Rhizosphere carboxylates and morphological root traits in pasture legumes and grasses

Cited by 49 publications

References 54 publications

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

The carboxylate composition of rhizosheath and root exudates from twelve species of grassland and crop legumes with special reference to the occurrence of citramalate

Differences in nutrient foraging among Trifolium subterraneum cultivars deliver improved P-acquisition efficiency

Effect of maize and peanut crops on Ivory Coast northern soil biological activities and their response to arbuscular mycorrhizal fungi inoculation

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