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... Wheat (Triticum aestivum L.) seedlings were grown for 4 days in an acid soil horizon treated with 10 levels each of Ca(OH)₂, CaSO₄ and CaCI₂. The treatments resulted in a wide range of A1 levels and AI speciation in soil solution. Seedling root length in the Ca(OH)₂ treatments was significantly related (p < 0.01) to calculated AI³⁺ activity in soil solution. The AI-SO₄ complex in soil solution had ...
... Fifty-five acid soil horizons from 19 profiles were evaluated for aluminum toxicity using root elongation as a criterion in a two-day petri dish bioassay. The method proved to be simple, efficient, and precise enough to clearly distinguish aluminum toxicity differences among horizons within and between profiles. Although toxicity patterns within profiles differed, it was common for surface horizon ...
... Sorghum [Sorghum bicolor (L.) Moench] is the fifth most important cereal crop of the world. In South America, it is grown mainly on acid soils, and its production on these soils is limited by deficient levels of available P, Ca, Mg, and micronutrients, and toxic levels of Al and Mn. A greenhouse experiment was undertaken to evaluate the genotypic differences in sorghum for uptake (U), inhibition ( ...
... Remediation of soil acidity is crucial for increasing crop production and improving environmental quality of acid infertile soils. Soil incubation and greenhouse pot experiments were carried out to examine the interactions between phosphate rock (PR), coal combustion by-product (BP), dolomitic lime (L), and cellulose (C) in an acidic soil and their effects on ryegrass (Lolium perenne L. cv ‘Linn’) ...
cultivars; forage crops; grain crops; liming; acid soils; Triticum aestivum; aluminum; grain yield; metal tolerance; forage production; Great Plains region
Abstract:
... Soil acidity in the Great Plains of the USA can reduce forage and grain yields of winter wheat, primarily by Al toxicity. Indigenous cultivars may vary in seedling tolerance to Al toxicity, but the benefit that Al tolerance provides to forage and grain production is not well documented in this region. Backcrossed-derived lines of 'Chisholm' and 'Century' were selected with an additional gene from ...
Zea mays; genotype; soil pH; acid soils; nutrient use efficiency; aluminum; metal tolerance; genetic variation; cultivars; tropical soils
Abstract:
... Maize ( Zea mays L.) is the third most important cereal grown in the world. In South and Central America, maize is mostly grown on acidic soils. On these soils, yields are limited by deficient levels of available P, Ca, and Mg, and toxic levels of Al and Mn. A greenhouse study was conducted with 22 maize genotypes originating from Africa, Europe, and North, Central, and South America on acid, dark ...
... White clover (Trifolium repens L.) is widely distributed in the Appalachian region, except on highly acid soils. We used a procedure where a thin layer of soil is placed on top of solidified water agar to characterize effects of acid soil on seedling root growth. Our objectives were to evaluate the soil-on-agar technique by using four soils (non-limed and limed) with diverse chemical characteristi ...
... Tall fescue (Festuca arundinacea Schreb.) plants infected by the fungal endophyte Neotyphodium coenophialum (Morgan-Jones & Gams) (Glenn et al., 1996) often perform better than noninfected plants, especially in marginal resource environments. There is a lack of information about endophyte related effects on the rhizosphere of grasses. In a greenhouse experiment, four endophyte-infected (E+) tall f ...
... Variations in genotype rankings among screenings for Al tolerance in hydroponics may be related to differences in the composition of the solutions. In the present study, we investigated the involvement of Mg ions in modifying Al rhizotoxicity in soybeans. Root elongation was strongly inhibited by Al in a simple, 800 micromolars CaSO4 solution, but elongation increased noticeably when the solutions ...
... Malate occupies a central role in plant metabolism. Its importance in plant mineral nutrition is reflected by the role it plays in symbiotic nitrogen fixation, phosphorus acquisition, and aluminum tolerance. In nitrogen-fixing root nodules, malate is the primary substrate for bacteroid respiration, thus fueling nitrogenase. Malate also provides the carbon skeletons for assimilation of fixed nitrog ...
interspecific variation; Thlaspi; organic acids and salts; phytotoxicity; heavy metals; ion transport; root exudates; gene expression; aluminum; genetic techniques and protocols; roots
Abstract:
... Plants have evolved sophisticated mechanisms to deal with toxic levels of metals in the soil. In this paper, an overview of recent progress with regards to understanding fundamental molecular and physiological mechanisms underlying plant resistance to both aluminum (Al) and heavy metals is presented. The discussion of plant Al resistance will focus on recent advances in our understanding of a mech ...
... We assessed the effects of landscape features (vegetation type and topography), season, and spatial hierarchy on the nutrient content of surface soils in the Luquillo Experimental Forest (LEF) of Puerto Rico. Considerable spatial variation characterized the soils of the LEF, and differences between replicate sites within each combination of vegetation type (tabonuco vs. palo colorado vs. dwarf vs. ...
... Decreases in nutrient availability after loss of soil-water saturation are significant constraints to productivity in lowland rainfed rice soils. The effectiveness of soil amendments like lime and straw in ameliorating these constraints are poorly understood. This pot experiment was conducted in Cambodia to investigate changes in soil chemical properties and nutrient uptake by rice after applying ...
... Aluminium (Al), mobilized by acidic deposition, has been claimed to be a major threat to forest vitality. Fine root mortality, decreased root growth and reduced nutrient uptake have been observed in controlled laboratory experiments where roots of tree seedlings were exposed to elevated concentrations of Al. Yet, evidence for Al-induced root damage from forest stands is scarcely reported. Neverthe ...
... Root elongation in short-term experiments with wheat (Triticum aestivum L.) seedlings demonstrated that the following ions were rhizotoxic in the order Cu2+>Al 3+ >> H+>Zn2+ >> Na+. Additions of Ca2+ and Mg2+ alleviated the toxicity, but the relative ameliorative effectiveness of Ca2+ and Mg2+ depended upon the toxicant. The effectiveness of Mg2+ relative to Ca2+ was 0.098 for Na+, 0.37 for H+, 1. ...