Evaluation of inbred maize lines for aluminum tolerance in nutrient solution

Magnavaca, R.; Gardner, C. O.; Clark, R. B.

doi:10.1007/978-94-009-3581-5_23

Cited by 61 publications

(56 citation statements)

References 12 publications

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“…Por outro lado, para o CLRS observaram-se coeficientes de correlação positivos e baixos (r = 0,33** e r = 0,10 aos três e sete dias de germinação, respectivamente), indicando que este índice, aos três dias de germinação, tende a favorecer plântulas com maior CIRS . Estas estimativas confirmam a tendência de coeficientes de correlação positivos em relação ao CLRS e negativos em relação ao CRRS obtidos por Magnavaca et al (1987a), que ao realizar este mesmo tipo de abordagem relatou valores de r = -0,02 para CRRS e r = 0,31** para CLRS.…”

Section: Resultsunclassified

“…Testando quatro diferentes tipos de índices fenotípicos para avaliação da tolerância ao Al, Magnavaca et al (1987a) concluíram que o comprimento relativo da raiz seminal (CRRS) foi o mais adequado para este tipo de avaliação, por ser o único a possibilitar correções quanto às diferenças de vigor que ocorrem durante a germinação. Por outro lado, Prioli (1987) verificou que o comprimento líquido da raiz seminal (CLRS) foi mais eficiente quando comparado com o CRRS, por apresentar menores coeficientes de variação.…”

Section: Introductionunclassified

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Eficiência de índices fenotípicos de comprimento de raiz seminal na avaliação de plantas individuais de milho quanto à tolerância ao alumínio

Martins

Parentoni

Lopes

et al. 1999

Pesq. agropec. bras.

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Termos para indexação: solução nutritiva, toxidez de alumínio, avaliação de plântulas. EFFICIENCY OF ROOT LENGTH PHENOTYPIC INDEX IN THE EVALUATION OF INDIVIDUAL MAIZE PLANTS FOR ALUMINUM TOLERANCEABSTRACT -The objective of this work was to verify the efficiency of the relative seminal root length (RSRL) and net seminal root length (NSRL) as phenotypic indexes for aluminum tolerance in individual maize plants. Seedlings of Al tolerant and susceptible genotypes were grown in nutrient solution containing toxic level of Al for a period of seven days, after which the values of RSRL and NSRL were determined. The results obtained when mean values of RSRL and NSRL were utilized showed that both indexes were able to discriminate tolerant from susceptible maize genotypes. However, when individual values of RSRL and NSRL were utilized, some tolerant plants scored as susceptible ones were observed, showing that the phenotypic evaluation of individual plants by both indexes is subjected to significant errors, mainly in the characterization of susceptible plants. Therefore, in studies for quantitative traits loci (QTLs) mapping for Al tolerance in maize, where these indexes are used, the most appropriate is to use F 3 families, where it is possible to obtain mean values for RSRL and NSRL and then utilize these means to represent the phenotypic values of the respective F 2 plants.

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Section: Resultsunclassified

Section: Introductionunclassified

Eficiência de índices fenotípicos de comprimento de raiz seminal na avaliação de plantas individuais de milho quanto à tolerância ao alumínio

Martins

Parentoni

Lopes

et al. 1999

Pesq. agropec. bras.

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“…RRG and hematoxylin staining have proved to be suitable phenotypic criteria for assessing Al tolerance in maize in full nutrient solution (Magnavaca et al, 1987;Cançado et al, 1999). The South American maize single cross (SLP 181/ 71 ϫ Cateto Colombia 96/71) used in the present study showed a high level of Al tolerance, as indicated by the small (about 30%) root growth inhibition observed in solutions containing up to 450 m Al (80 m Al 3ϩ activity).…”

Section: Al Tolerance and The Spatial Distribution Of The Al-activatementioning

confidence: 99%

“…This leads to the speculation that Al-activated transport and synthesis may be coupled in Al-tolerant maize. Furthermore, it appears that Al tolerance in maize is a genetically complex trait (Magnavaca et al, 1987) that could involve several different Al tolerance mechanisms. These data lead us to speculate that there could be an Al exclusion tolerance mechanism based on citrate exudation, and a second internal tolerance mechanism using increases in internal levels of Alchelating citrate.…”

Section: Differences In Al-activated Organic Acid Transport and Root mentioning

confidence: 99%

The Physiology and Biophysics of an Aluminum Tolerance Mechanism Based on Root Citrate Exudation in Maize

Piñeros

Magalhães

Alves³

et al. 2002

Plant Physiology

192

164

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Al-induced release of Al-chelating ligands (primarily organic acids) into the rhizosphere from the root apex has been identified as a major Al tolerance mechanism in a number of plant species. In the present study, we conducted physiological investigations to study the spatial and temporal characteristics of Al-activated root organic acid exudation, as well as changes in root organic acid content and Al accumulation, in an Al-tolerant maize (Zea mays) single cross (SLP 181/71 ϫ Cateto Colombia 96/71). These investigations were integrated with biophysical studies using the patch-clamp technique to examine Al-activated anion channel activity in protoplasts isolated from different regions of the maize root. Exposure to Al nearly instantaneously activated a concentration-dependent citrate release, which saturated at rates close to 0.5 nmol citrate h Ϫ1 root Ϫ1 , with the half-maximal rates of citrate release occurring at about 20 m Al 3ϩ activity. Comparison of citrate exudation rates between decapped and capped roots indicated the root cap does not play a major role in perceiving the Al signal or in the exudation process. Spatial analysis indicated that the predominant citrate exudation is not confined to the root apex, but could be found as far as 5 cm beyond the root cap, involving cortex and stelar cells. Patch clamp recordings obtained in whole-cell and outside-out patches confirmed the presence of an Al-inducible plasma membrane anion channel in protoplasts isolated from stelar or cortical tissues. The unitary conductance of this channel was 23 to 55 pS. Our results suggest that this transporter mediates the Al-induced citrate release observed in the intact tissue. In addition to the rapid Al activation of citrate release, a slower, Al-inducible increase in root citrate content was also observed. These findings led us to speculate that in addition to the Al exclusion mechanism based on root citrate exudation, a second internal Al tolerance mechanism may be operating based on Al-inducible changes in organic acid synthesis and compartmentation. We discuss our findings in terms of recent genetic studies of Al tolerance in maize, which suggest that Al tolerance in maize is a complex trait.Al limits crop production on the acid soils that comprise up to 50% of the world's potentially arable lands (von Uexkull and Mutert, 1995). When the soil pH drops below 5, the rhizotoxic Al species, Al 3ϩ , is solubilized into the soil solutions to levels that inhibit root growth and function. However, some plants have evolved Al tolerance mechanisms that enable them to grow in Al-toxic, acid soil environments (for review, see Kochian, 1995;Ma et al., 2001). Earlier work in this field showed that Al tolerance in wheat (Triticum aestivum) was associated with a reduced accumulation of Al in the root apex, but not the mature root (see, for example, Rincon and Gonzales, 1992;Tice et al., 1992; Delhaize et al., 1993a). Delhaize et al. (1993aDelhaize et al. ( , 1993b subsequently provided compelling evidence for the existence of an A...

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“…After germination for 4 days, the endosperm was removed from the seeds to eliminate the nutritional reserves, especially P (Rose et al, 2013), and three uniform seedlings were selected for each of the three replicates. The experimental design was completely randomized, with three replicates, and two treatments: LP and HP at 2.5 and 250 µM P, respectively, in a modified Magnavaca nutrient solution (Magnavaca et al, 1987). A system consisting of plastic file folders lined with germination paper was used for hydroponic growth (de Sousa et al, 2012).…”

Section: Methodsmentioning

confidence: 99%

Screening of inbred popcorn lines for tolerance to low phosphorus

et al. 2016

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ABSTRACT. Increasing phosphorus use efficiency in agriculture is essential for sustainable food production. Thus, the aims of this study were: i) to identify phosphorus use efficiency (PUE) in popcorn lines during the early plant stages, ii) to study the relationship between traits correlated with PUE, and iii) to analyze genetic diversity among lines. To accomplish this, 35 popcorn lines from Universidade Estadual de Maringá breeding program were studied. The experiment was conducted in a growth chamber using a nutrient solution containing two concentrations of phosphorus (P): 2.5 µM or low P (LP) and 250 µM or high P (HP). After 13 days in the nutrient solution, root morphology traits, shoot and root dry weight, and P content of the maize seedlings were measured. A deviance analysis showed there was a high level of genetic variability. An unweighted pair group method with arithmetic mean (UPGMA) clustering analysis identified three groups for the LP treatment (efficient, intermediate, and inefficient) and three groups for the HP treatment (responsive, moderately responsive, and unresponsive). The results of a principal component analysis and selection index were consistent with the UPGMA analysis, and lines 1, 2, 13, 17, 26, and 31 were classified as PUE.

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Evaluation of inbred maize lines for aluminum tolerance in nutrient solution

Cited by 61 publications

References 12 publications

Eficiência de índices fenotípicos de comprimento de raiz seminal na avaliação de plantas individuais de milho quanto à tolerância ao alumínio

Eficiência de índices fenotípicos de comprimento de raiz seminal na avaliação de plantas individuais de milho quanto à tolerância ao alumínio

The Physiology and Biophysics of an Aluminum Tolerance Mechanism Based on Root Citrate Exudation in Maize

Screening of inbred popcorn lines for tolerance to low phosphorus

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