Plant-Plant Allelopathic Interactions III: Partitioning and Seedling Effects of Phenolic Acids as Re
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Beschreibung
1 Reflections Regarding Plant-Plant Interactions, Plant-Plant Communications and Plant-Plant Allelopathic Interactions with an Emphasis on Plant-Plant Allelopathic Interactions
1.1 Plant-Plant Interactions
1.1.1 Direct Transfer between Plants1.1.2 Plant-Plant Communications1.1.3 Plant-Plant Allelopathic Interactions1.1.4 Relationships1.2 Defining the Boundaries of Plant-Plant Allelopathic Interactions1.2.1 Plant-Plant Allelopathic Interactions and the Biotic and Physicochemical Environment1.2.2 Boundaries for Plant-Plant Allelopathic Interactions1.2.3 Terminology1.3 Approaches1.4 References
2 General Background for Plant-Plant Allelopathic Interactions
2.1 Introduction2.2 Sources of Available (Free) Organic Compounds in the Field Environment2.2.1 Living Plants2.2.2 Litter, Residues, and Organic Matter2.2.3 Residual Available Organic Compounds and Recalcitrant Organic Matter2.2.4 Formation of Available Secondary, Tertiary, etc. Organic Compounds2.3 Sinks for Available Organic Compounds2.4 Sources (Input)-Sink Relationships for Available Organic Compounds2.4.1 Sources (Inputs)-Sink Relationships2.4.2 Turnover Rates of Available Organic Compounds2.5 When is an Organic Compounds an Allelopathic Compound?2.6 Identified Putative allelopathic (IPA) Compounds2.6.1 Effects for Identified Putative Allelopathic (IPA) Compounds2.6.2 Modifying Elements for the Effects of IPA Compounds2.6.3 Time Frame for the Effects of IPA Compounds2.6.4 Mobility and Distribution of IPA Compounds in the Environment2.6.5 Fractions of IPA Compounds2.6.6 Available/Active Fractions, Uptake, Depletion, Turnover Rates and Residual Concentrations2.7 Modeling2.8 References
3 Conceptual Models for Soil Systems and Physicochemical Properties of Organic Compounds
3.1 Introduction3.2 Sources (Inputs) and Transport3.2.1 Hydrophilic Organic Molecules (All Non-Gaseous Water-Soluble Molecules No Matter their Classification)3.2.2 Hydrophobic Organic Molecules (All Non-Gaseous Water-Insoluble Molecules No Matter their Classification)3.2.3 Volatile Organic Molecules (All Gaseous Molecules No Matter their Classification)3.3 Sinks3.3.1 Hydrophilic Organic Molecules (All Non-Gaseous Water-Soluble Molecules No Matter their Classification)3.3.2 Hydrophobic Organic Molecules (All Non-Gaseous Water-Insoluble Molecules No Matter their Classification)3.3.3 Volatile Organic Molecules (All Gaseous Molecules No Matter their Classification)3.4 Conceptual Models for Source (Potential Inputs)-Sink Relationships3.5 Physicochemical Properties for Individual Organic compounds3.6 Linkages between Physicochemical Properties of Organic compounds3.7 References4 Simple Phenolic Acids in Solution Culture I: pH and pKa
4.1 Introduction
4.2 Simple Phenolic Acids4.3 Physicochemical Properties of Phenolic Acids in Solution Cultures4.4 pKa Values of Phenolic Acids4.5 Calculating Neutral and Negative Fractions4.6 Depletion (Uptake) of Neutral and Negative Fractions of Individual Phenolic Acids 4.7 Effects of Neutral Fractions of Individual Phenolic Acids on Growth4.8 Neutral Fractions and Mixtures of Phenolic Acids4.9 The Neutral fraction vs the Negative fraction as Causative Agents4.10 Final Comments4.11 References5 Simple Phenolic Acids in Solution Culture II: Log P, Log D and Molecular structure
5.1 Introduction
5.2 Log P
5.3 Log D (i.e., pH adjusted Log P)5.4 Potential Roles of Log P and Log D5.4.1 Log P and Individual Phenolic Acids5.4.2 Outliers5.4.3 Log D and Individual Phenolic Acids5.4.4 Log P and Concentrations of the Neutral Molecules5.4.5 Mixture of Phenolic Acids5.5 Molecular Structure5.6 Roles of Microorganisms5.7 Final Comments5.8 References
6 Simple Phenolic Acids in Soil Culture I: Sorption, Kd and KOC
6.1 Introduction
6.2 Sorption and Sorption Coefficients6.2.1 Definitions
6.2.2 Sorption of Phenolic Acids in Soil Systems
6.2.3 Soil-Water (Kd) and Soil Organic Carbon-Content (Koc) Coefficients
6.3 Soil Sorption of Phenolic Acids Based on Batch Equilibrium-Desorption Techniques and Water and Neutral EDTA Extractions
6.3.1 Percent Sorption, Kd and Koc of Phenolic Acids in Cecil and Portsmouth Soils6.3.2 Percent E-Sorption
6.4 Final Comments
6.5 References
7 Simple Phenolic Acids in Soil Culture II: Biological Processes in Soil
7.1 Introduction
7.2 Utilization and Responses of Microorganisms to Phenolic Acids
7.2.1 Soil-Non-Mycorrhizal Root Systems
7.2.2 Mycorrhizosphere, Rhizoplane and Endorhizosphere of Mycorrhizal Roots
7.2.3 Nodulation7.2.4 Field vs Laboratory Systems: Microbial Populations Based on Colony-Forming Units
7.3 Uptake of Phenolic Acids by Roots and Mycorrhizae
7.3.1 Root Uptake
7.3.2 Mycorrhizal Uptake
7.4 References
8 Hypothetical Solution-Culture System Sub-Models
8.1 Introduction
8.2 General Background8.2.1 Features of the Nutrient-Culture System
8.2.2 The Conceptual Model
8.2.3 Physicochemical Properties of Phenolic Acids and Phenolic Acid Effects
8.3 Hypothetical Models: Exploring the Source (Input)-Sink Relationships and Effects of Phenolic acids by Means of the Conceptual Model
8.3.1 Depletion of Ferulic Acid, p-Coumaric Acid, and Vanillic Acid and Their Effects on Net Phosphorous Uptake (see Lyu et al. 1990)
8.3.2 Depletion of ferulic Acid, vanillic Acid and an Equal-Molar Mixtures of Ferulic Acid and Vanillic Acid and Their Effects on Net Phosphorous Uptake (see Lyu et al. 1990)
8.3.3 Depletion of Ferulic Acid from Treatment Solutions and Effects of Ferulic Acid on Absolute Rates of Leaf Expansion as Modified by pH over a 48-hr Treatment Period (see Blum et al. 1985b)
8.4 Final Comments
8.5 References
9 Hypothetical Soil-Culture System Sub-Models
9.1 Introduction9.2 Features of Soil and Soil-Sand Cultures
9.2.1 Basic Systems
9.2.2 Media, Roots, Microorganisms, Treatment Solutions and Effects9.3 Measurements, Coefficients, and Relationships
9.3.1 Determining Depletion, Sorption and Residual Concentrations of Phenolic Acids in Soil and Soil-Sand Systems
9.3.2 Sorption, Kd, Kf and Koc Coefficients
9.3.3 pKa, Log P and Log D
9.3.4 Colony-Forming Units (CFU) of Microorganisms9.3.5 Seedling Effects
9.3.6 Cause and Effect Relationships
9.4 Hypothetical Models: Fundamentals of Cecil and Portsmouth Soil Systems
9.4.1 Phenolic Acid Input
9.4.2 Processes that Determine Available and Unavailable Phenolic Acids
9.4.3 Available (Free and Reversibly Sorbed) and Unavailable Phenolic Acids
9.4.4 Seedling Effects and Some Modifying Factors
9.5 Final Comments9.6 References
10 Quantitative Hypothetical System Models for Cecil Soil-Sand Systems
10.1 Introduction
10.2 The Systems and their Hypothetical Models
10.2.1 Continuous-Input Column Open Systems10.2.2 Single and Multiple Input Closed Systems
10.3 References
11 Quantitative Hypothetical System Model for Portsmouth Soil-Sand System and Potential Modifying Factors
11.1 Introduction11.2 Quantitative Data Available for Portsmouth Soil and Soil-Sand Systems
11.2.1 Physicochemical Processes in Soil11.2.2 Physicochemical Processes and Microbial Populations and Utilization in Soil-Sand Systems
11.2.3 Rhizosphere Microbial Populations and Utilization in Cucumber Seedling-Soil-Sand Systems
11.2.4 Seedling Inhibition
11.3 Hypothetical Model for Portsmouth Soil-Sand Systems
11.3.1 Systems11.3.2 Potential Modifiers of Black Box Values
11.4 References
12 Epilog: Assumptions, Models, Hypotheses and Conclusions
12.1 Introduction
12.2 Physicochemical Properties of Phenolic Acids
12.2.1 Solubility and vapor Pressure
12.2.2 pKa12.2.3 Log P
12.2.4 Molecular Structure
12.2.5 Sorption Coefficients (Kd, Kf and Koc)12.2.6 Can Physicochemical Properties of Phenolic Acids be Used as Tools to Help Understand the Complex Behavior of Phenolic Acids and the Ultimate Effects of Phenolic Acids on Sensitive Seedlings?
12.3 Other Tools12.3.1 Soil Extractions
12.3.2 Plate-Dilution Frequency technique
12.3.3 Leaf Area and Leaf Area Expansion
12.3.4 Water Utilization, Evapotranspiration and µM and mM of Phenolic acids in Soil
12.4 Assumptions for Model Systems12.4.1 Nutrient Culture Systems
12.4.2 Continuous-Input Systems
12.4.3 Single and Multiple Input Closed Systems
12.5 Summary of Observations for Seedling-Microbe-Soil Systems
12.5.1 Physicochemical Processes12.5.2 Root Uptake and Microbial Utilization
12.5.3 Seedling Effects
12.5.4 Partitioning of Phenolic Acids
12.6 What insights do the laboratory bioassays and the conceptual and hypothetical models of laboratory systems tell us about the potential behavior and effects of phenolic acids in field systems?
12.6.1 Similarities for Laboratory and Field Systems12.6.2 Differences for Laboratory and Field Systems
12.6.3 Conclusions
12.7 References