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Absorción Foliar
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Esta animación describe cómo se absorben los herbicidas por las hojas, e ilustra cómo sus características físico-químicas alteran su movimiento a través de la cutícula. También se muestran mecanismos pasivos y activos de la absorción de los herbicidas a través de las membranas de las plantas.

Subject:
Life Science
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Lesson
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Advanced Backcross Breeding
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This lesson is a detailed explanation of the backcross breeding process. Variations based on whether backcrossing is performed with dominant, recessive, or multiple traits are discussed. Calculations associated with backcross breeding are explained.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Analysis of Augmented Block Design Using R Part 1: An Introduction to an Augmented Design Approach in Plant Breeding
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Ashu GuruUniversity of Nebraska Raikes SchoolDeana Namuth-CovertUniversity of Nebraska Dept of Agronomy and Horticulture2014When planning any science research project to gain information for a particular goal or objective, much thought is placed into what is called the experimental design or layout of the experiment. This is important to ensure the researcher is able to obtain useful data which can later be analyzed and provide information as to whether or not the scientific hypothesis being tested is supported or rejected.  In this eLesson series we will look at a plant breeding experiment which uses the Augmented Design and utilize tools in R to analyze the data.   

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Analysis of Augmented Block Design Using R Part 2: Analyzing Treatments as Fixed Effects
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Ashu GuruUniversity of Nebraska Raikes SchoolDeana Namuth-CovertUniversity of Nebraska Dept of Agronomy and Horticulture2014When planning any science research project to gain information for a particular goal or objective, much thought is placed into what is called the experimental design or layout of the experiment. This is important to ensure the researcher is able to obtain useful data which can later be analyzed and provide information as to whether or not the scientific hypothesis being tested is supported or rejected.  In this eLesson series, we will look at a plant breeding experiment which uses the Augmented Design and utilize tools in R to analyze the data.   

Subject:
Life Science
Material Type:
Lesson Plan
Provider:
Plant and Soil Sciences eLibrary
Provider Set:
Plant and Soil Sciences eLibrary
Analysis of Augmented Block Design Using R Part 3: Analyzing Treatments as Random Effects
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Ashu GuruUniversity of Nebraska Raikes SchoolDeana Namuth-CovertUniversity of Nebraska Dept of Agronomy and Horticulture2014When planning any science research project to gain information for a particular goal or objective, much thought is placed into what is called the experimental design or layout of the experiment. This is important to ensure the researcher is able to obtain useful data which can later be analyzed and provide information as to whether or not the scientific hypothesis being tested is supported or rejected.  In this eLesson series we will look at a plant breeding experiment which uses the Augmented Design and utilize tools in R to analyze the data.   

Subject:
Life Science
Material Type:
Lesson Plan
Provider:
Plant and Soil Sciences eLibrary
Provider Set:
Plant and Soil Sciences eLibrary
Aparición de resistencia a herbicidas, en una población de malezas
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El uso repetido del mismo herbicida, puede provocar poblaciones de malezas que consisten de biotipos susceptibles (S) que son controlados y biotipos resistentes (R), que escapan al control para producir y retornar semilla con la característica de resistencia, al banco de semillas del suelo. Esta lección se enfocará en la dinámica poblacional de una población de malezas mezclada con biotipos S y R. Se comparará y contrastará la tasa a la que aparecen malezas resistentes en una población bajo diversas presiones de selección. ****** Esta lección se enfocará en la dinámica poblacional de una población mezclada (biotipos susceptibles y resistentes a un herbicida), y comparar y contrastar la tasa a la cual aparece resistencia al herbicida, en una población de malezas mezclada, bajo diversas presiones de selección.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Aplicaciones prácticas de la fisiología de los herbicidas en las plantas
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Esta lección se focaliza en el impacto de las características de la planta y el herbicida, importantes para determinar el desempeño del herbicida. Se usarán imágenes visuales para ilustrar varios principios, incluyendo el sitio de absorción del herbicida en la planta, transporte, el sitio de acción sensible, y efectos del ambiente sobre el desempeño del herbicida. Esta información provee la base para maximizar la utilidad del uso de los herbicidas.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Appearance of Herbicide Resistance in a Weed Population
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Through the repeated use of the same herbicide, weed populations can consist of susceptible (S)-biotypes that are controlled and herbicide resistant (R)-biotypes that are left behind to produce and return seed with the resistance characteristic back into the soil. This lesson will highlight the population dynamics of a mixed weed population, containing S- and R-biotypes, and compare and contrast the rate at which herbicide resistant weeds appear in a population under a diversity of selection pressures. This lesson will highlight the population dynamics of a mixed (herbicide susceptible and resistant biotype) weed population, and compare and contrast the rate of appearance of herbicide resistance in a mixed population under a diversity of selection pressures.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Auxin and Auxinic Herbicide Mechanisms of Action
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This animation illustrates how auxins and auxinic herbicides may elicitresponses in plant cells. It describes basipetal transport of auxinsvia influx and efflux carriers and displays a scenario of auxin actionwhere auxin receptors recognize auxins and auxinic herbicides, whichthen induce a signal transduction cascade to turn on various geneproducts. The role of these gene products in plant response is shown aswell.

Subject:
Life Science
Material Type:
Lesson
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Auxin and Auxinic Herbicide Mechanism(s) of Action - Part 1 - Introduction
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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.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Auxin and Auxinic Herbicide Mechanism(s) of Action - Part 2 - Advanced
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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 thought to act as hormone mimics. This lesson will detail how these herbicides are related structurally and physiologically to the natural plant hormone, auxin (indole-3-acetic acid; IAA) and explain the biochemical mechanisms which may be involved in their action. The mechanism of cell to cell transport and cellular uptake of auxins will be reviewed as well as how they cause cell elongation and induce ethylene biosynthesis. Receptors, signal transduction pathways and changes in gene expression for the natural hormone, IAA, will be described and related their role in auxinic herbicide activity.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Backcross Breeding
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How the conventional breeding method of backcross breeding is done.This is the seventh of a series of seven animations that detail theprocess of crop genetic engineering. To begin at the beginning, see Overview of Crop Genetic Engineering. (To return to the animation previous to this, go to Gene Gun.)

Subject:
Life Science
Material Type:
Lesson
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Backcross Breeding 1 - Basic Gene Inheritance
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This lesson reviews the basics of gene inheritance. It compares plants that are homozygous, heterozygous, and hemizygous for an allele and how gene expression is affected by the dominance of an allele. It also explains how to use a Punnett square to predict genotypic and phenotypic ratios of offspring.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Backcross Breeding 2 - The Backcrossing Process
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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 stacking are also discussed.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Backyard Mystery
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Backyard Mystery is an NSF-funded bio-STEM curriculum.  Materials target National Science Education Content Standards in Life Sciences for Grades 5 through 7.   

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Bacteria Transformation
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Illustrates the beginning stages of gene cloning. This animation shows how plasmids become recombinant and are inserted into bacteria cells. This is the second of four animations detailing the gene cloning process. To begin at the beginning, see Making a Recombinant Plasmid. (To see the next animation, go to Making a Gene Library.)

Subject:
Life Science
Material Type:
Lesson
Provider:
Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Breeding for Grain Quality Traits: The challenges of measuring phenotypes and identifying genotypes.
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An introduction to methods and difficulties of plant breeding.  Comparisons are made between corn, proso millelt, wheat, and sorghum.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Breeding for Resistance in California Strawberry to Verticillium Dahliae
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This e-library lesson will focus on breeding resistant strawberries to the fungus Verticillium dahliae, common name Verticillium wilt. This is a serious fungal disease that can result in a loss of 50% or more of a strawberry harvest when grown in infested soil . This lesson is written for undergraduate and graduate students who are currently studying plant pathology or the management of crop disease. The main goal is to provide an example of how a cultivar can be made more resistant to a plant pathogen with the use of plant breeding methods. 

Subject:
Life Science
Material Type:
Lesson Plan
Provider:
Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Case of the Drought Resistant Genetically Engineered Corn Plant
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This scenario accompanies theonline lesson, "Transpiration - Water Movement Through Plants", and isdesigned to allow you to apply the concepts learned in that lesson to areal-life problem.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Cellular Absorption of Herbicides
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Before a herbicide can kill a plant, it must be absorbed by the plant’s leaves or roots and enter a cell which possesses the metabolic pathway the herbicide targets.  This lesson follows the fate of the herbicide after it has entered the plant via leaf or root tissue, and explains the factors controlling transport of a herbicide into plant cells.  This lesson describes 1) the barriers to herbicide entry, such as the plant cell membrane, 2) the role that the herbicide’s chemical properties have on the rate of cellular absorption, and 3) experimental approaches to understanding herbicide absorption at the cellular level.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Chi-Square Test for Goodness of Fit in a Plant Breeding Example
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In plant breeding and genetics research, plant breeders establish a hypothesis to explain how they think a particular trait is inherited, such as if it is due to one gene with complete dominance, an interaction of more than one gene, or quantitative inheritance, with many genes contributing, etc. Next the breeder sets up crosses and observes the resulting progeny to test that inheritance hypothesis. However, when the data is collected, oftentimes the plant breeder discovers the number of plants observed in each class is not exactly what was expected from the hypothesis. The question then is how do plant breeders determine if the data is close enough to what they expected to determine the hypothesis is supported or not? Following a tomato disease resistance example in this lesson, you will learn a simple statistical test that breeders can use to conclude if the experimental data supports their hypothesis of single gene, completely dominant inheritance.This lesson is written for undergraduate and graduate students studying plant breeding, as well as agriculture professionals unfamiliar with the use of the chi-square analysis.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Clasificación de los herbicidas
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Esta lección se enfoca en entender el sistema de clasificación en el cual están organizados los herbicidas. Terminología como clasificación, jerarquía de clasificación, ejemplos de clasificación y un breve resumen de los ocho modos de acción, se discuten en esta lección. Una vez que esto se entiende, es mucho más fácil comprender herbicidas similares y saber por qué estos pueden exhibir ciertos síntomas en malezas y cultivos. Objetivos:Entender la forma en que se clasifican los herbicidas y su importancia en el manejo de la resistencia herbicidaEntender la importancia de la clasificación de los herbicidas por modo de acción, en vez de familiasSer capaz de entender la diferencia entre modo de acción y sitio de acciónSer capaz de diferenciar entre familias de herbicidas, modos de acción, y sitios de acciónEntender nombre común, nombres comerciales y sitios de absorción

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Codificación de los Genes
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Esta animación muestra como un gen está construido para eventualmente producir una proteína en una planta de maíz Bt (Bt corn). Esta es la quinta de una serie de siete animaciones que detallan el proceso de ingeniería genética de cultivos.

Subject:
Life Science
Material Type:
Lesson
Provider:
Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Corn Breeding: Introduction to Concepts in Quantitative Genetics
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This is the second in a series of lessons specifically designed to instruct individuals without any formal training in genetics or statistics about the science of corn breeding. Individuals with formal training in genetics or statistics but without any training in plant breeding also may benefit from taking these lessons.

Subject:
Life Science
Genetics
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Corn Breeding: Lessons From the Past
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This is the first in a series of lessons specifically designed to instruct individuals without any formal training in genetics or statistics about the science of corn breeding. Individuals with formal training in genetics or statistics but without any training in plant breeding also may benefit from these lessons.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Corn Breeding: Mass Selection
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This is the fourth in a series of lessons specifically designed to instruct individuals without any formal training in genetics or statistics about the science of corn breeding. Individuals with formal training in genetics or statistics but without any training in plant breeding also may benefit from taking these lessons.

Subject:
Life Science
Material Type:
Lesson Plan
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Plant and Soil Sciences eLibrary
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Plant and Soil Sciences eLibrary
Corn Breeding: Types of Cultivars
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This is the third in a series of lessons specifically designed to instruct individuals without any formal training in genetics or statistics about the science of corn breeding. Individuals with formal training in genetics or statistics but without any training in plant breeding also may benefit from taking these lessons.

Subject:
Life Science
Material Type:
Lesson Plan
Provider:
Plant and Soil Sciences eLibrary
Provider Set:
Plant and Soil Sciences eLibrary