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Auxin and Auxinic Herbicide Mechanism(s) of Action - Part 1 - Introduction
The selective control of broadleaf weeds in cereal grain crops by auxinic herbicides has made this group one of the most widespread and important herbicide families in use. These herbicides were the first organic herbicides developed that were selective or able to kill one group of plants, but not another (i.e. kill broadleaf, but not grass plants). This lesson will introduce the major features of these herbicides, discuss their major uses and describe the symptoms of the injury they cause as well as introduce how they kill sensitive plants.
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Auxin and Auxinic Herbicide Mechanism(s) of Action - Part 2 - Advanced
The selective control of broadleaf weeds in cereal grain crops by auxinic herbicides has made this group one of the most widespread and important herbicide families in use. These herbicides are thoug...
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Backcross Breeding 1 - Basic Gene Inheritance
This lesson reviews the basics of gene inheritance. It compares plants that are homozygous, heterozygous, and hemizgous
for an allele and how gene expression is affected by the dominance of an allel...
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Backcross Breeding 2 - The Backcrossing Process
This lesson discusses the final stage of developing genetically engineered crops. The need for backcrossing, and the steps
of this breeding method are described. Yield lag, yield drag, and gene stac...
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Cellular Absorption of Herbicides
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Deliberate Mechanical Defoliation of Perennials
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Foliar Absorption and Phloem Translocation
Herbicides must be absorbed into plants in order to be effective. Herbicide
absorption can occur through leaves, roots or both. The process by which herbicides
kill weeds, called mode of actio...
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Gene Expression Part 1: Reading Genes to Make Proteins
This lesson describes the steps involved in a cell as DNA sequence information is read to make RNA and RNA is read to make proteins.
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Gene Expression Part 2: Expression of Herbicide Resistant ALS Genes in Plants
This lesson describes how changes in the DNA sequence of a gene can alter the synthesis of a protein and thus influence traits such as herbicide resistance.
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Herbicidas que Actúan A través de la Fotosíntesis
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Herbicide Classification
This lesson focuses on understanding the classification system into
which herbicides are organized. Terms of classification, classification
hierachy, examples of classification and a brief overview ...
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Herbicide Resistance: Mechanisms, Inheritance, and Molecular Genetics
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Herbicides That Act Through Photosynthesis
This lesson will examine herbicides that adversely affect light-related processes, thereby causing damage to plants. There are four basic mechanisms that will be studied in this class of agents: her...
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Inhibidores de la Síntesis de Aminoácidos Aromáticos
En esta lección se detallarán los procesos bioquímicos que son afectados por los herbicidas que inhiben la síntesis de aminoácidos en las plantas. Se describirá también la importancia de los am...
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Inhibitors of Aromatic Amino Acid Biosynthesis
This lesson will detail the biochemical mechanisms that are affected by herbicides which inhibit a plant’s ability to synthesize amino acids. The significance of amino acids and proteins will also b...
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Inhibitors of Branched Chain Amino Acid Biosynthesis
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Inhibitors of Fatty Acid Synthesis and Elongation
Fatty acid synthesis and fatty acid elongation are two parts of a critically important pathway in plants. The endproducts are essential components of cell membranes, waxes, and suberin. Two chemical f...
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Just the facts
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La Interacción de la Luz con las Biomoléculas
En esta lección se describe la naturaleza de la luz, la energía de los fotones y como dicha energía puede ser transferida a las biomoléculas. Se describen también tanto los procesos benéficos c...
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La Transpiración - Movimiento del Agua a Través de las Plantas
La transpiración es la pérdida de agua en forma de vapor por las plantas. El agua es absorbida del suelo por las raíces y transportada en forma líquida por el xilema hacia las hojas. En las hojas,...
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Linkage - Part 1
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Linkage - Part 2
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Los Pigmentos Vegetales y la Fotosíntesis
En esta lección se examinarán las dos principales clases de pigmentos fotosintéticos: las clorofilas y los carotenoides. Se analizarán sus estructuras bioquímicas y su biosíntesis, y se explica...
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Native Plant Breeding: Bringing the Beauty of Nature Home
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Overview of Plant Genetic Engineering
Lesson one is a general description of the overall process of genetic engineering. A basic explanation of the five steps for genetically engineering a crop is provided. Details for each step are given...
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Perennial Plant Response to Defoliation - An Overview
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Plant Pigments and Photosynthesis
This lesson will examine the two major classes of phototsynthetic pigments, chlorophylls and carotenoids, their biochemical structures and their biosynthesis. The organization of these pigments into ...
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Practical Applications of Herbicide Physiology
This lesson will focus on the impact of herbicide and plant characteristics important in determining herbicide performance. Visual images will be used to illustrate several principles including herbic...
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Quantitative Trait Locus (QTL) Analysis 1
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Quantitative Trait Locus (QTL) Analysis 2
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Quantitative Traits
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Root Absorption and Xylem Translocation
Overview: Herbicides must be absorbed into plants in
order to be effective. Plant roots and below ground shoots have few
barriers to herbicide absorption; however, interactions with soil
particles ...
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Soils - Part 1: The Origin and Development of Soil
(How Soil Gets a Life and a Name)
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Soils - Part 2: Physical Properties of Soil and Soil Water
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Soils - Part 3: Soil Organic Matter
In this lesson, you will learn such terms as organic, soil organic matter, nutrient, decomposition, humus, compost, and soil structure. In addition, you will be able to predict the effect of land uses...
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Soils - Part 4: Soil pH
Soil pH is defined and its implications for crop production are described in this lesson. How are soil pH and buffer pH determined? How are these assessments used in lime recommendations? The factors ...
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Soils - Part 5: Nitrogen as a Nutrient
In this lesson, you will be able to describe the forms of nitrogen found in the soil. The nitrogen cycle and how nitrogen is lost in the environment will be thoroughly discussed. Forms of nitrogen uti...
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Soils - Part 6: Phosphorus and Potassium in the Soil
This lesson explains the importance of phosphorus fixation and describes methods for applying phosphorus and the advantages (and disadvantages) of each. It also describes the three forms of potassium ...
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Soils - Part 7: Soil and Plant Considerations for Calcium, Magnesium, Sulfur, Zinc, and other Micronutrients
The 16 essential elements for plant growth and the relative quantities of each needed by plants to grow normally will be discussed in this lesson. You will learn to identify the source of specific nut...
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Soils - Part 8: Characteristics of Fertilizer Materials
The various characteristics of fertilizer materials being sold on the market today will be discussed. You will learn to identify some of the consequences of using each type of fertilizer material and ...
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Soils - Part 9: Fundamentals of Soil Testing
The major emphasis in this lesson is soil testing and understanding the procedures needed to take a representative soil sample. You will understand the term variability, how it affects soil tests, and...
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The Dihybrid Cross and Independent Assortment
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The Inheritance of Variation
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The Interaction of Light with Biological Molecules
This lesson describes the nature of light, the energy within photons and how this energy may be transferred to biological molecules. In addition, the beneficial and harmful methods for de-exciting mo...
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Transpiration - Water Movement through Plants
This lesson and its animation follows the journey of water through a plant from its uptake by roots to its evaporation from the leaf surface. How this journey is altered by plant characteristics such...
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