Harnessing Soil Microbes to Improve Plant Phosphate Efficiency in Cropping Systems

Kafle, Arjun; Cope, Kevin R.; Raths, Rachel; Yakha, Jaya K; Subramanian, Senthil; Bücking, Heike; Garcia, Kevin

doi:10.3390/agronomy9030127

Cited by 68 publications

(35 citation statements)

References 163 publications

(190 reference statements)

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“…Over the past two decades, significant advances have been made in elucidating the molecular signaling mechanisms required for AM fungi to colonize plants (Kamel et al, 2017;Luginbuehl and Oldroyd, 2017;MacLean et al, 2017;Choi et al, 2018). In brief, low phosphorus availability in the soil leads to reduced phosphorus levels within plant tissues (Kafle et al, 2019). This deficiency triggers increased biosynthesis of strigolactones, a class of plant hormones that also function as signaling molecules for AM fungi (Akiyama and Hayashi, 2006;Yoneyama et al, 2007;Gomez-Roldan et al, 2008;Umehara et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

The Ectomycorrhizal Fungus Laccaria bicolor Produces Lipochitooligosaccharides and Uses the Common Symbiosis Pathway to Colonize Populus Roots

et al. 2019

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0000-0002-3128-9439 (J.-M.A.)Mycorrhizal fungi form mutualistic associations with the roots of most land plants and provide them with mineral nutrients from the soil in exchange for fixed carbon derived from photosynthesis. The common symbiosis pathway (CSP) is a conserved molecular signaling pathway in all plants capable of associating with arbuscular mycorrhizal fungi. It is required not only for arbuscular mycorrhizal symbiosis but also for rhizobia-legume and actinorhizal symbioses. Given its role in such diverse symbiotic associations, we hypothesized that the CSP also plays a role in ectomycorrhizal associations. We showed that the ectomycorrhizal fungus Laccaria bicolor produces an array of lipochitooligosaccharides (LCOs) that can trigger both root hair branching in legumes and, most importantly, calcium spiking in the host plant Populus in a CASTOR/POLLUX-dependent manner. Nonsulfated LCOs enhanced lateral root development in Populus in a calcium/calmodulin-dependent protein kinase (CCaMK)-dependent manner, and sulfated LCOs enhanced the colonization of Populus by L. bicolor. Compared with the wildtype Populus, the colonization of CASTOR/POLLUX and CCaMK RNA interference lines by L. bicolor was reduced. Our work demonstrates that similar to other root symbioses, L. bicolor uses the CSP for the full establishment of its mutualistic association with Populus.

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Section: Introductionmentioning

confidence: 99%

The Ectomycorrhizal Fungus Laccaria bicolor Produces Lipochitooligosaccharides and Uses the Common Symbiosis Pathway to Colonize Populus Roots

et al. 2019

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“…Numerous microorganisms, including fungi, are capable of releasing P from soil through solubilization and mineralization in the natural soil environment (Alori et al, 2017;P. N. Bhattacharyya & Jha, 2012;Kafle et al, 2019). It is estimated that 50% of all bacteria in soil are capable of solubilizing P (S. B.…”

Section: The Diversity Of P Solubilizing Rhizbacteriamentioning

confidence: 99%

“…According to Alori et al, 2017, organic P can be as high as 30 -50% of the total P in soil. The most common form of organic P is phytate/inositol P but are largely unavailable to plants because they lack phytase activities (Alori et al, 2017;Kafle et al, 2019;A. Kumar, 2016).…”

Section: Mechanisms Of P Solubilizing Plant Root Residing Bacteriamentioning

confidence: 99%

“…B. Sharma et al, 2013). It is a fundamental component of enzymes, proteins, coenzymes, nucleotides, phospholipids, and nucleic acids (Alaylar et al, 2020;Kafle et al, 2019;Kalayu, 2019). According to Mitra et al, (2020), P availability also improves other basic plant functions such as cell division, cell enlargement, and transformation of starches and sugars.…”

Section: Introductionmentioning

confidence: 99%

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Phosphate-Solubilizing Rhizobacteria: Diversity, Mechanisms, and Prospects in Sustainable Agriculture

Aloo¹,

Makumba²,

Mbega³

2020

Preprint

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Phosphorus (P) is the second-most important element after nitrogen that is required for plant growth. Although this element is abundant in most soils, it is rarely available in plant-accessible forms since most of it normally exists in soil in insoluble forms such as phosphates. In conventional agriculture, P is normally supplied as chemical fertilizer to satisfy plant P requirements. This, to a large extent, boosts plant production. However, chemical fertilizers are costly, have a huge carbon footprint, and are environmentally-unsustainable owing to the high energy requirements during their synthesis. Besides, P-containing agricultural run-offs contribute hugely to the eutrophication of water bodies and environmental degradation. Moreover, plants can consume only a small amount of chemically-supplied P since between 75 and 90% of this form of P normally get precipitated into complexes and rapidly become fixed in soil. These issues and concerns necessitate research into alternative and viable ways of supplying P to plants. Rhizobacteria have for decades been investigated in vivo and in planta as suitable tools in sustainable agriculture due to the plant-growth-promoting activities such as nutrients’ solubilization, nitrogen fixation, and production of phytohormones. Although a lot of research has been done on different nutrients-solubilizing rhizobacteria and their potential in sustainable agriculture, their mechanisms of action and prospects in sustainable agriculture remain to be fully understood. This review particularly focuses on the P solubilizing rhizobacteria and evaluates their diversity, mechanisms of action, and prospects in sustainable agriculture based on the present and future scenario of their application. Such information is useful in determining their potential and evaluating their prospects in promoting sustainable agricultural systems.

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“…The beneficial combination effects of bacteria with fungi have been reported by Patreze and Cordeiro (2004) who found that these bacteria may affect fungi and plant host through different mechanisms that affect receptivity of root, root-fungus recognition, fungal growth, modification of chemistry for rhizospheric soil, and germination of the fungal propagules. Kafle et al, (2019) reported that Arbuscular Mycorrhizal Fungi and phosphate-solubilizing bacteria have a major role in natural and agro-ecosystems, and their use as bioinoculants is an increasing tendency in agricultural practices.…”

Section: Introductionmentioning

confidence: 99%

Effect of Inoculation with Biofertilizers and Molybdenum on the Growth and Productivity of Faba Bean (vicia faba l.) Grown in Sandy Soil under Drip Irrigation

Sary¹,

Niel

Abdelhameid

2020

Alexandria Science Exchange Journal

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Field experiments were carried out during 2016/ 2017 and 2017/2018 growing winter seasons using sandy soil under drip irrigation system, at Ali Mubark Experimental Farm, South Tahrir Region, Egypt. The experimental layout was carried out to provide complete randomized blocks in a split-plot design. The objective of this study to investigate the effect of application of foliar ammonium molybdate in combination with inoculation with biological fertilizers: Mycorrhiza (Glomus sp.) and Rhizobium (Rhizobium leguminosarum) on the growth performance and productivity of Faba bean (Vicia faba L.) plant grown in sandy soil under drip irrigation. The main treatments included foliar application of ammonium molybdate (+Mo) and without ammonium molybdate (-Mo) at rates of 5mg Mo /l and 0 mg Mo/l, respectively. The sub main treatments included four treatments (i) biological fertilizer Mycorrhiza, (ii) Rhizobia, (iii) Mix between the two biofertilizers and (iv) without biofertilizers inoculation. The obtained results indicated that treatment with Mo recorded high values of all parameters as compared to without Mo. Application of biofertilizer improved all growth characters, available of N, P, K, O.M. and soil respiration. The most effective treatment was obtained by the mixed RIZB/MYCO treatment followed by RIZB for N, K and by MYCO for P, O.M. and soil respiration. The upper soil layer (0-30 cm) contained high values of available N or P, O.M and soil respiration while available P increased in the lower layer (30-60 cm). Macro elements (N, P, K) contents in leaves and grains showed high response to addition of ammonium molybdate with the mixed RIZB/MYCO treatments followed by RIZB for N and protein, also MYCO for K and P content. Vegetative growth characters and yield components of Faba bean plant showed high response to the mixed RIZB/MYCO treatment followed by MYCO treatment. The results showed that Myco infection had enhanced with MYCO treatment while Nitrogenase activity was enhanced with RIZB treatment for Faba bean plant grown under sandy soil and drip irrigation conditions.

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Harnessing Soil Microbes to Improve Plant Phosphate Efficiency in Cropping Systems

Cited by 68 publications

References 163 publications

The Ectomycorrhizal Fungus Laccaria bicolor Produces Lipochitooligosaccharides and Uses the Common Symbiosis Pathway to Colonize Populus Roots

The Ectomycorrhizal Fungus Laccaria bicolor Produces Lipochitooligosaccharides and Uses the Common Symbiosis Pathway to Colonize Populus Roots

Phosphate-Solubilizing Rhizobacteria: Diversity, Mechanisms, and Prospects in Sustainable Agriculture

Effect of Inoculation with Biofertilizers and Molybdenum on the Growth and Productivity of Faba Bean (vicia faba l.) Grown in Sandy Soil under Drip Irrigation

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