Soil acidity factors and nodulation ofTrifolium repens

Wood, M.; Cooper, J. E.; Holding, A. J.

doi:10.1007/bf02450370

Cited by 69 publications

(30 citation statements)

References 25 publications

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“…Further, Mn toxicity has been reported not to affect root hair growth (Wood et al, 1984), as was evidenced in the current study by the good root hair growth observed in the low Cu solutions. This Mn toxicity is due to the displacement of Mn from the resin by other cations with greater affinities for the resin's binding sites (such as Cu 2+ , Ca 2+ , and Zn 2+ ) (manufacturer's guidelines).…”

Section: Discussionsupporting

confidence: 47%

Effect of Cu Toxicity on Growth of Cowpea (Vigna unguiculata)

2006

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Accurate determination of the rhizotoxicity of Cu in dilute nutrient solutions is hindered by the difficulty of maintaining constant, pre-determined concentrations of Cu (micromolar) in solution.The critical Cu 2+ activity associated with a reduction in the growth of solution-grown cowpea (Vigna unguiculata (L.) Walp. cv Caloona) was determined in a system in which Cu was maintained constant through the use of a cation exchange resin. The growth of roots and shoots was found to be reduced at solution Cu 2+ activities ≥ 1.7 µM (corresponding to 90 % maximum growth).Although root growth was most likely reduced due to a direct Cu 2+ toxicity, it is considered that the shoot growth reduction is attributable to a decrease in tissue concentrations of K, Ca, Mg, and Fe and the formation of interveinal chlorosis. At high Cu 2+ activities, roots were brown in color, short and thick, had bent root tips with cracking of the epidermis and outer cortex, and had local swellings behind the roots tips due to a reduction in cell elongation. Root hair growth was reduced at concentrations lower than that which caused a significant reduction in overall root fresh weight.Abbreviations: CDTA -cyclohexane-1,2-diaminetetra-acetic acid; DI -deionised; EC -electrical conductivity; I -ionic strength; ICPAES -inductively coupled plasma atomic emission spectrometry; ICPMS -inductively coupled plasma mass spectrometry

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Section: Discussionsupporting

confidence: 47%

Effect of Cu Toxicity on Growth of Cowpea (Vigna unguiculata)

2006

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“…For example, curling of inoculated lucerne {Medieago sativa L.) root hairs was found to be dependent on pH at solution Ca concentrations ^ 400 //M (Munns, 1970). Also, root hair formation of white clover {Trifolium repens L.) was inhibited at pH 4-3 when the Ca concentration was < 500 //M, but was independent of Ca concentration at higher pH (Wood, Cooper & Holding, 1984). While the precise role of Ca in protecting root hairs from toxicities of H^ and other ions is not fully understood, Ewens & Leigh (1985) have suggested that Ca is involved in the maintenance of an electrochemical gradient across the root tip.…”

Section: Dj Brady and Othersmentioning

confidence: 99%

Calcium amelioration of aluminium toxicity effects on root hair development in soybean [Glycine max (L.) Merr.]

et al. 1993

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SUMMARYLow activities of the monomeric aluminium (Al) species, AP+, AKOH)^" and A1(OH)2+ in solution reduce root growth and root hair development in soybean [Glycine max (L.) Merr.]. Calcium (Ca) ameliorates to a certain extent the toxic effects of Al on root growth, but the interactive effects of Ca and Al on root hair development are not known. In the absence of added Al in solution culture, Ca concentration over the range 500-2000 //M had little effect on root growth or root hair development of soybean cv. Fitzroy. Where the sum of the activities of the monomeric Al species was 2 //M, taproot elongation and lateral root development of soybean was suppressed in solution with 500 //M Ca. The length of the root hair zone was only 10% of that in plants not exposed to Al, and scanning electron microscopy revealed a low density of root hairs. Increasing the Ca concentration to 2000 fiM largely overcame these deleterious effects. The results are discussed in relation to the role of root hairs as infection sites for Bradyrhizobium, and the known effects of Al in suppressing nodulation in soybean.

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“…Genotypes NaCl ( Means followed by the same letter within a column are not significantly different (P≤0.05) using the least significant difference (LSD) test rhizobia strain effect on common bean has been reported in previous works (Wood et al 1984;Peoples et al 1995;Ndakidemi et al 2006;Bambara and Ndakidemi 2010). Inoculation with these local rhizobia strains, especially RhM11, could play a crucial role in plant growth and nodule biomass improvement under salinity constraint when plant growth depends on SNF.…”

Section: Strainsmentioning

confidence: 93%

Effect of salinity on nodulation, nitrogen fixation and growth of common bean (Phaseolus vulgaris) inoculated with rhizobial strains isolated from the Haouz region of Morocco

Faghire

Bargaz²,

Farissi³

et al. 2011

Symbiosis

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This study compared growth, nodulation, nitrogen fixation, and nodular enzyme activities in response to salinity in some common bean-rhizobia symbiotic combinations. Seeds of Paulista and Efequince, two varieties of the common bean (Phaseolus vulgaris) were germinated and seedlings were transferred to pots containing vermiculite inoculated with the reference Rhizobium strain CIAT899 or with RhM11 or RhM14, two local strains. Plants were grown in a temperature-controlled glasshouse at 28°C and irrigated with a nutrient solution without NaCl (control) or supplemented with 25 mM NaCl (stressed). Plants were harvested at the flowering stage. The results showed that in controls, inoculation with RhM11 improved plant and nodule growth compared with those inoculated with RhM14 and CIAT 899. NaCl treatment generally had a negative affect on plant and nodule growth. Under the saline treatment, symbiotic nitrogen fixation was not significantly affected in the CIAT899-Paulista, CIAT899-Efequince and RhM11-Paulista combinations. Plant mineral nutrition was negatively affected under salt treatment for all of the tested symbiotic combinations. Inoculation with CIAT899 and RhM11 conferred more plant tolerance to salinity than inoculation with RhM14. The nodular phosphoenolpyruvate carboxylase (PEPC) and malate dehydrogenase (MDH) exhibited higher activities and were less affected by salinity in plants inoculated with the reference strain CIAT899 than those inoculated with local strains. We conclude that plants inoculated with CIAT899 and RhM11 showed more salinity stress tolerance than those inoculated with RhM14.

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Soil acidity factors and nodulation ofTrifolium repens

Cited by 69 publications

References 25 publications

Effect of Cu Toxicity on Growth of Cowpea (Vigna unguiculata)

Effect of Cu Toxicity on Growth of Cowpea (Vigna unguiculata)

Calcium amelioration of aluminium toxicity effects on root hair development in soybean [Glycine max (L.) Merr.]

Effect of salinity on nodulation, nitrogen fixation and growth of common bean (Phaseolus vulgaris) inoculated with rhizobial strains isolated from the Haouz region of Morocco

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