Relationship between molecular characteristics of soil humic fractions and glycolytic pathway and krebs cycle in maize seedlings

Nardi, Serenella; Muscolo, Adele; Vaccaro, Silvia; Baiano, Salvatore; Spaccini, Riccardo; Piccolo, Alessandro

doi:10.1016/j.soilbio.2007.07.006

Cited by 161 publications

(100 citation statements)

References 35 publications

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“…Muscolo et al (2007) postularam que a interação entre a matéria húmica e o sistema radicular é possível na rizosfera quando moléculas húmicas em solução tem tamanho suficiente para permitir seu fluxo no apoplasto e atingir as membranas celulares. Dessa forma, uma série de trabalhos (Piccolo et al, 1992;Nardi et al, 2002;Quaggiotti et al, 2004;Muscolo et al, 2007;Nardi et al, 2007) consideraram os AF como a fração de SH de maior bioatividade. Entretanto, nesse trabalho foi observado que, independente do estádio de decomposição da matéria orgânica das turfeiras, os AH foram o material húmico de maior bioatividade.…”

Section: Resultsunclassified

Root growth of tomato seedlings intensified by humic substances from peat bogs

Silva

Canellas

Olivares

et al. 2011

Rev. Bras. Ciênc. Solo

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Peats are an important reserve of humified carbon in terrestrial ecosystems. The interest in the use of humic substances as plant growth promoters is continuously increasing. The objective of this study was to evaluate the bioactivity of alkaline soluble humic substances (HS), humic (HA) and fulvic acids (FA) isolated from peats with different decomposition stages of organic matter (sapric, fibric and hemic) in the Serra do Espinhaço Meridional, state of Minas Gerais. Dose-response curves were established for the number of lateral roots growing from the main plant axis of tomato seedlings. The bioactivity of HA was greatest (highest response in lateral roots at lowest concentration) while FA did not intensify root growth. Both HS and HA stimulated root hair formation. At low concentrations, HS and HA induced root hair formation near the root cap, a typical hormonal imbalance effect in plants. Transgenic tomato with reporter gene DR5::GUS allowed the observation that the auxin-related signalling pathway was involved in root growth promotion by HA.

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Section: Resultsunclassified

Root growth of tomato seedlings intensified by humic substances from peat bogs

Silva

Canellas

Olivares

et al. 2011

Rev. Bras. Ciênc. Solo

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“…Nardi et al [40] showed that HS affected the enzyme activities related to glycolysis and the tricarboxylic acid cycle (TCA) in different ways, depending on humic molecular size, molecular characteristic and concentration. The glycolysis enzymatic activities studied by Nardi et al [40] were glucokinase, phosphoglucose isomerase, PPi-dependent phosphofructokinase and pyruvate kinase, while those involved in the respiration process were cytrate synthase, malate dehydrogenase and the cytosolic form of NADP + -isocitrate dehydrogenase. The stimulation increased significantly for all enzymes at 1 mg C · L −1 for either a soil HS or its fraction separated by size exclusion chromatography.…”

Section: Changes On Primary and Secondary Metabolismmentioning

confidence: 99%

Physiological responses to humic substances as plant growth promoter

Canellas

Olivares

2014

Chem Biol Techn Agric

338

224

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Humic substances (HS) have been widely recognized as a plant growth promoter mainly by changes on root architecture and growth dynamics, which result in increased root size, branching and/or greater density of root hair with larger surface area. Stimulation of the H + -ATPase activity in cell membrane suggests that modifications brought about by HS are not only restricted to root structure, but are also extended to the major biochemical pathways since the driving force for most nutrient uptake is the electrochemical gradient across the plasma membrane. Changes on root exudation profile, as well as primary and secondary metabolism were also observed, though strongly dependent on environment conditions, type of plant and its ontogeny. Proteomics and genomic approaches with diverse plant species subjected to HS treatment had often shown controversial patterns of protein and gene expression. This is a clear indication that HS effects of plants are complex and involve non-linear, cross-interrelated and dynamic processes that need be treated with an interdisciplinary view. Being the humic associations recalcitrant to microbiological attack, their use as vehicle to introduce beneficial selected microorganisms to crops has been proposed. This represents a perspective for a sort of new biofertilizer designed for a sustainable agriculture, whereby plants treated with HS become more susceptible to interact with bioinoculants, while HS may concomitantly modify the structure/activity of the microbial community in the rhizosphere compartment. An enhanced knowledge of the effects on plants physiology and biochemistry and interaction with rhizosphere and endophytic microbes should lead to achieve increased crop productivity through a better use of HS inputs in Agriculture.

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“…They also increase water permeability of plant membranes and water holding capacity (Kumar & Singh, 2017). Many observations were documented about the high efficiency of humic substances and their effects on the plant growth (Chen & Aviad, 1990;Nardi et al, 2007;Cesco et al, 2002 andRady, 2012). Yang et al (2004) reported that humate substances can indirectly and directly affect the physiological processes of plant growth by providing minerals uptake and biochemical substances, and carry trace elements and growth regulators for enhancing the plant's growth.…”

Section: Germination and Plant Growthmentioning

confidence: 99%

Response of Salt-Stressed Wheat ( Triticum aestivum L.) to Potassium Humate Treatment and Potassium Silicate Foliar Application

et al. 2017

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T HE PRESENT study was carried out to investigate the effect of high NaCl concentrations on some growth parameters and physiological processes of wheat (Triticum aestivum L.) plant. The results indicated that Gemeza.9 was the most sensitive cultivar to high salinity levels compared to all tested wheat cultivars. Moreover, salinity stress caused a reduction in the germination percentage by 65% and all growth parameters by 21%, 25% and 60% in the lengths of shoot, root and leaf area, also by 27% and 48% in fresh weights of shoot, root and 40% and 75% in dry weights of shoot and root. It also increased the activity of antioxidant enzymes (peroxidase and catalase), lipid peroxidation and ascorbic acid content. Salinity induced increase of osmolytes compounds such as total soluble proteins, carbohydrates and amino acids. Furthermore, all measured yield parameters, the percentage of grain's maturity and productivity were highly decreased. Accordingly, the role of potassium humate and potassium silicate either sole or combined in alleviating the toxic effect of salinity was also studied. Results showed that application of potassium humate as sole had a stimulatory effect higher than potassium silicate or their combination. It increased the germinating percentage by 128% at 200mM NaCl. In addition, potassium humate and potassium silicate increased the photosynthetic activity, decreased the activity antioxidant enzymes (Peroxidase and Catalase) as well as biosynthesis of MDA and ascorbic acid also they induced increase biosynthesis of proteins and carbohydrates in yielded grains. Accordingly, our study recommends the application of potassium humate as an organic fertilizer and potassium silicate as a foliar spray for improving the quality and quantity of the sensitive wheat cultivar Gemeza.9 cultivated in salty lands and increases its productivity.

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Relationship between molecular characteristics of soil humic fractions and glycolytic pathway and krebs cycle in maize seedlings

Cited by 161 publications

References 35 publications

Root growth of tomato seedlings intensified by humic substances from peat bogs

Root growth of tomato seedlings intensified by humic substances from peat bogs

Physiological responses to humic substances as plant growth promoter

Response of Salt-Stressed Wheat ( Triticum aestivum L.) to Potassium Humate Treatment and Potassium Silicate Foliar Application

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