External phosphate and calcium concentrations, and Ph, but not the products of rhizobial nodulation genes, affect the attachment of rhizobium meliloti to roots of annual medics

Howieson, J.G.; Robson, A. D.; Ewing, MA

doi:10.1016/0038-0717(93)90195-h

Cited by 43 publications

(24 citation statements)

References 42 publications

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“…This defect has been associated to inhibition in the polar growth of the root hair cells, which affects the rhizobia infection process, including the infection thread formation [9,[73][74]. Additionally, an early study reports that Pi deficiency affects the rhizobia attachment to Medicago roots, as we observed in this study [75]. Thus, our data suggest that Pi deficiency negatively affects the polar elongation of the root hairs likely leading to inefficient attachment and entrapping of rhizobia.…”

Section: Rhizobia-induced Root Hair Deformation and Infection Thread supporting

confidence: 68%

Phosphate Deficiency Negatively Affects Early Steps of the Symbiosis between Common Bean and Rhizobia

Isidra-Arellano¹,

Reyero-Saavedra²,

Sánchez-Correa³

et al. 2018

Preprint

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Phosphate (Pi) deficiency reduces nodule formation and development in different legume species including common bean. Despite the significant progress in the understanding of the genetic responses underlying the adaptation of nodules to Pi deficiency, it is still unclear whether this nutritional deficiency interferes with the molecular dialog between legumes and rhizobia, if so, what part of the molecular dialog is impaired? In this study, we provide evidence demonstrating that Pi deficiency negatively affects critical early molecular and physiological responses required for a successful symbiosis between common bean and rhizobia. We demonstrated that the infection thread formation and the expression of PvNSP2, PvNIN, and PvFLOT2, genes controlling the nodulation process, were significantly reduced in Pi-deficient common bean seedlings. Further transcriptional analysis revealed that the expression of hormones-related genes is compromised in Pi-deficient seedlings inoculated with rhizobia. Additionally, we showed that regardless of the presence or absence of rhizobia, the expression of PvRIC1 and PvRIC2, two genes participating in the autoregulation of nodule number, was higher in Pi-deficient seedlings than in control seedlings. The data presented in this study shed light on the understanding of how Pi deficiency impacts the early steps of the symbiosis between common bean and rhizobia.

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Section: Rhizobia-induced Root Hair Deformation and Infection Thread supporting

confidence: 68%

Phosphate Deficiency Negatively Affects Early Steps of the Symbiosis between Common Bean and Rhizobia

Isidra-Arellano¹,

Reyero-Saavedra²,

Sánchez-Correa³

et al. 2018

Preprint

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“…Competition studies between different rhizobia have shown that in the presence of a rhizopine-producing strain, the strains that are able to catabolize rhizopine occupy a higher percentage of the nodules . The strains found to be rhizopine producers in a study by Wexler and co-workers (1 995) have, in other studies, been associated with long-term persistence (Evans and Howieson, 1993) or high competitiveness (Jensen, 1987). Rhizopines may provide new strategies to improve competitiveness, and perhaps persistence, of rhizobial inoculants in the field.…”

Section: B the Rhizopine Conceptmentioning

confidence: 92%

“…At low pH, nodulation of white clover (Wood et al, 1984a), subclover (Whelan and Alexander, 1986), pea (Lie, 1969;Evans et al, 1980), cowpea (Keyser et al, 1979), alfalfa (Munns, 1968(Munns, ,1970, and bean (Vargas and Graham, 1988;Wolff et al, 1993) is reduced, even in the presence of high rhizobial numbers. Mainly, the early stages in the nodulation process, such as attachment (Smit et al, 1986(Smit et al, , 1987Vargas and Graham, 1988;CaetanoAnoll6s et al, 1989;Howieson et al, 1993), root hair curling (Munns, 1968;Evans et al, 1980), and initiation of infection thread formation (Munns, 1968(Munns, , 1970Keyser et al, 1979;Evans, 1980;Franco and Munns, 1982), appear to be the most sensitive ones. Differences in nodule-forming capacity at low pH exist between strains (Graham et al, 1982;Franco and Munns, 1982;Thornton and Davey, 1983).…”

Section: B Soil Aciditymentioning

confidence: 96%

Factors Influencing Nodule Occupancy by Inoculant Rhizobia

Vlassak

Vanderleyden

1997

Critical Reviews in Plant Sciences

115

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“…This impairs the nutrient uptake and cation exchange of both symbiotic partners, subsequently reducing their growth and development (Kopittke et al, 2015;Wood, Cooper, & Holding, 1984). Furthermore, acidic soil conditions interfere with legume-rhizobia communication by reducing the production of early nodulation components such as flavonoids (Miransari & Smith, 2007), Nod factors (McKay & Djordjevic, 1993), and other nodulation components (Richardson, Simpson, Djordjevic, & Rolfe, 1988), which impedes rhizobial attachment to root hairs (Caetano-Anollés, Lagares, & Favelukes, 1989;Howieson, Robson, & Ewing, 1993) and root hair deformation and curling (Miransari et al, 2006;Munns, 1968). There is also evidence indicating that acidic soils directly inhibit nodulation by inducing a legume-derived signal that systemically suppresses nodulation (Lin, Gresshoff, & Ferguson, 2012).…”

Section: Acid Soil Regulation Of Nodulationmentioning

confidence: 99%

Legume nodulation: The host controls the party

Ferguson

Mens

Hastwell

et al. 2018

Plant Cell & Environment

285

229

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Global demand to increase food production and simultaneously reduce synthetic nitrogen fertilizer inputs in agriculture are underpinning the need to intensify the use of legume crops. The symbiotic relationship that legume plants establish with nitrogen-fixing rhizobia bacteria is central to their advantage. This plant-microbe interaction results in newly developed root organs, called nodules, where the rhizobia convert atmospheric nitrogen gas into forms of nitrogen the plant can use. However, the process of developing and maintaining nodules is resource intensive; hence, the plant tightly controls the number of nodules forming. A variety of molecular mechanisms are used to regulate nodule numbers under both favourable and stressful growing conditions, enabling the plant to conserve resources and optimize development in response to a range of circumstances. Using genetic and genomic approaches, many components acting in the regulation of nodulation have now been identified. Discovering and functionally characterizing these components can provide genetic targets and polymorphic markers that aid in the selection of superior legume cultivars and rhizobia strains that benefit agricultural sustainability and food security. This review addresses recent findings in nodulation control, presents detailed models of the molecular mechanisms driving these processes, and identifies gaps in these processes that are not yet fully explained.

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External phosphate and calcium concentrations, and Ph, but not the products of rhizobial nodulation genes, affect the attachment of rhizobium meliloti to roots of annual medics

Cited by 43 publications

References 42 publications

Phosphate Deficiency Negatively Affects Early Steps of the Symbiosis between Common Bean and Rhizobia

Phosphate Deficiency Negatively Affects Early Steps of the Symbiosis between Common Bean and Rhizobia

Factors Influencing Nodule Occupancy by Inoculant Rhizobia

Legume nodulation: The host controls the party

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