The uptake of alkaloids by plants from the soil is determined by rhizosphere pH

Rhizosphere ◽  
2020 ◽  
Vol 15 ◽  
pp. 100234
Author(s):  
Tahani Hijazin ◽  
Alzahraa Radwan ◽  
Laura Lewerenz ◽  
Sara Abouzeid ◽  
Dirk Selmar
Keyword(s):  
Rhizosphere Ph

scholarly journals Root excretion and plant tolerance to cadmium toxicity - a review

2008 ◽  
Vol 53 (No. 5) ◽  
pp. 193-200 ◽  
Author(s):  
J. Dong ◽  
W.H. Mao ◽  
G.P. Zhang ◽  
F.B. Wu ◽  
Y. Cai
Keyword(s):  
Root Exudates ◽  
Anthropogenic Activities ◽  
Cadmium Toxicity ◽  
Research Work ◽  
Future Research ◽  
Rhizosphere Ph ◽  
Plant Tolerance ◽  
Rhizosphere Environment ◽  
Safe Food ◽  
Tolerance To Cadmium

Significant quantities of Cd have been added to soils globally due to various anthropogenic activities, posing a serious threat to safe food production and human health. Rhizosphere, as an important interface of soil and plant, plays a significant role in the agro-environmental system. This article presents a review of relationship between root excretion and microorganisms and plant resistance to Cd toxicity and possible mechanisms. Root exudates markedly altered in species and quantity under Cd stress. Root exudates can affect Cd absorption by plants through changing the physical and chemical characteristics of rhizospheres. The influence of root exudates on Cd bioavailability and toxicity may include modifying the rhizosphere pH and Eh, chelating/complexing and depositing with Cd ions, and altering the community construction, the numbers and activities of rhizospheric microbes. In this paper, the methods to reduce the transfer of Cd in soil-plant system by adjusting rhizosphere environment are discussed, and some aspects are also proposed that should be emphasized in the future research work.

scholarly journals Rhizosphere properties of maize genotypes with contrasting phosphorus efficiency

2011 ◽  
Vol 35 (1) ◽  
pp. 171-181
Author(s):  
Edilson Carvalho Brasil ◽  
Vera Maria Carvalho Alves ◽  
Ivanildo Evódio Marriel ◽  
Gilson Villaça Exel Pitta ◽  
Janice Guedes de Carvalho
Keyword(s):  
Functional Diversity ◽  
Root Hairs ◽  
Phosphorus Efficiency ◽  
Experimental Unit ◽  
Rhizosphere Ph ◽  
P Use Efficiency ◽  
Nodal Roots ◽  
Maize Genotypes ◽  
Use Efficiency ◽  
Rhizosphere Properties

An experiment was conducted in a growth chamber to evaluate characteristics of the rhizosphere of maize genotypes contrasting in P-use efficiency, by determining length and density of root hairs, the rhizosphere pH and the functional diversity of rhizosphere bacteria. A sample of a Red Oxisol was limed and fertilized with N, K and micronutrients. In the treatment with the highest P level, 174 mg kg-1 P was added. Each experimental unit corresponded to a PVC rhizobox filled with 2.2 dm-3 soil. The experiment was completely randomized with three replications in a 5 x 2 factorial design, corresponding to five genotypes (H1, H2 and H3 = P-efficient hybrids, H4 and H5 = P-inefficient hybrids) and two P levels (low = 3 mg dm-3, high = 29 mg dm-3). It was found that 18 days after transplanting, the nodal roots of the hybrids H3 and H2 had the longest root hairs. In general, the pH in the rhizosphere of the different genotypes was higher than in non-rhizosphere soil, irrespective of the P level. The pH was higher in the rhizosphere of lateral than of nodal roots. At low P levels, the pH variation of the hybrids H2, H4 and H5 was greater in rhizospheric than in non-rhizospheric soil. The functional microbial activity in the rhizosphere of the hybrids H3 and H5 was highest. At low soil P levels, the indices of microbial functional diversity were also higher. The microbial metabolic profile in the rhizosphere of hybrids H1, H2, H3, and H5 remained unaltered when the plants were grown at low P. The variations in the rhizosphere properties could not be related to patterns of P-use efficiency in the tested genotypes.

Evaluation of the rhizosphere pH of two sorghum genotypes in presence of three aluminium saturations and three potassium levels in soil

2001 ◽  
pp. 594-595
Author(s):  
G. V. E. Pitta ◽  
V. C. Baligar ◽  
R. B. Clark ◽  
V. M. C. Alves ◽  
C. A. Vasconcellos
Keyword(s):  
Rhizosphere Ph ◽  
Sorghum Genotypes

scholarly journals Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar pH optodes

2009 ◽  
Vol 330 (1-2) ◽  
pp. 173-184 ◽  
Author(s):  
Stephan Blossfeld ◽  
Jérôme Perriguey ◽  
Thibault Sterckeman ◽  
Jean-Louis Morel ◽  
Rainer Lösch
Keyword(s):  
Trace Metal ◽  
Contaminated Soils ◽  
Rhizosphere Ph

Rhizosphere pH Gradient Controls Copper Availability in a Strongly Acidic Soil

2009 ◽  
Vol 43 (15) ◽  
pp. 5686-5691 ◽  
Author(s):  
M. N. Bravin ◽  
P. Tentscher ◽  
J. Rose ◽  
P. Hinsinger
Keyword(s):  
Acidic Soil ◽  
Ph Gradient ◽  
Rhizosphere Ph ◽  
Copper Availability

scholarly journals Tissue ionome response to rhizosphere pH and aluminum in tea plants ( Camellia sinensis L.), a species adapted to acidic soils

2020 ◽  
Vol 1 (2) ◽  
pp. 152-164
Author(s):  
Hiroto Yamashita ◽  
Yusuke Fukuda ◽  
Shiori Yonezawa ◽  
Akio Morita ◽  
Takashi Ikka
Keyword(s):  
Camellia Sinensis ◽  
Rhizosphere Ph ◽  
Acidic Soils ◽  
Tea Plants

Root-induced dissolution of phosphate rock in the rhizosphere of lupins grown in alkaline soil

Soil Research ◽  
1995 ◽  
Vol 33 (3) ◽  
pp. 477 ◽  
Author(s):  
P Hinsinger ◽  
RJ Gilkes
Keyword(s):  
Phosphate Rock ◽  
Driving Forces ◽  
Lupinus Albus ◽  
Sole Source ◽  
High Rate ◽  
White Lupin ◽  
Rhizosphere Ph ◽  
Alkaline Soil ◽  
Pure Alumina ◽  
Narrow Leaf

Dissolution of North Carolina phosphate rock (PR) in the rhizosphere of white lupin (Lupinus albus) and narrow leaf lupin (L. angustifolius) was measured in a growth chamber experiment. Plants were grown for 8-13 days in an artificial soil (pure alumina sand) at alkaline pH to eliminate dissolution of PR due to reaction with the soil. Phosphate rock was supplied as the sole source of P and Ca for the plants at two rates of application (0.1 and 1 mg P g-1 soil). Both species dissolved considerable amounts of PR (up to 70% of PR present within 3 mm from the roots). Phosphorus extracted from the soil with 0.5 M NaOH showed that up to 69% of dissolved P accumulated in the rhizosphere of both species due to sorption by the soil, particularly at the high rate of application. Only white lupin utilized significant amounts of Ca. Thus P and Ca uptake were not driving forces for the root-induced dissolution of PR which was probably due to proton excretion that occurred concurrently, as evidenced by a decrease of rhizosphere pH of about 2 pH units. White lupin dissolved up to twice as much PR than narrow leaf lupin. This may be related to either the larger root biomass of white lupin or the particular excretion activity of its proteoid roots.

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