Plant Growth and Development

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.

Mecanismo(s) de Acción de las Auxinas y los Herbicidas Auxínicos - Parte 1- Introducción

Descripción: El control selectivo de malezas de hoja ancha en cultivos de cereales utilizando herbicidas auxínicos ha hecho de éstos una de las familias de herbicidas actualmente en uso más ampliamente distribuidas e importantes. Estos herbicidas fueron los primeros herbicidas orgánicos desarrollados que presentaron selectividad; es decir, capaces de matar un cierto grupo de plantas sin afectar a otros grupos (por ejemplo: matar plantas de hoja ancha pero no las de hoja angosta; en este documento se utilizará el término "gramíneas" para referirse a las plantas de hoja angosta o cereales). En esta lección se presentarán las principales características de los herbicidas auxínicos, se discutirán sus principales usos y se describirán los síntomas de daño que causan. De igual forma, se indicará la forma en que estos herbicidas matan a las plantas sensibles.

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 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.

Mecanismo(s) de Acción de los Herbicidas Auxínicos - Parte 2 - Nivel Avanzado

Descripción: El control selectivo de malezas de hoja ancha en cultivos de cereales por los herbicidas auxínicos ha hecho de éstos una de las familias de herbicidas actualmente en uso mas ampliamente distribuidas e importantes. Se cree que estos herbicidas actúan como simuladores hormonales. En esta lección se detallará la relación estructural y fisiológica entre los herbicidas auxínicos y la fitohormona natural auxina (ácido indol-3-acético; IAA por sus siglas en inglés) y se explicarán los mecanismos bioquímicos que pueden estar involucrados en su modo de acción. Se revisará el mecanismo de transporte de célula a célula y la absorción de las auxinas por las células, así como también la forma en que estas moléculas causan elongación celular e inducen la síntesis de etileno. De igual forma, se describirán los receptores, las rutas de transferencia de señales y los cambios en expresión genética inducidos por la fitohormona natural IAA y su relación con la actividad de los herbicidas auxínicos.

Corn Rootworm - Part 1: Description of Corn Rootworm and Other Early Season Corn Pests

This lesson will discuss the corn rootworm complex, which consists of the northern, western, and southern corn rootworm, focusing on the northern and western species. The information in this lesson will focus on the biology of corn rootworms in the north central Corn Belt, including Iowa and Nebraska. Crop producers, crop scouts, students, and the general public may find the information in this lesson helpful for identifying corn rootworm, other corn pests, and the feeding damage caused by each insect.

Corn Rootworm - Part 2: Corn Rootworm Management

This lesson will discuss economic thresholds and management options related to the corn rootworm complex consisting of the northern, western, and southern corn rootworm, with emphasis on the northern and western species. The information in this lesson will focus on the north central Corn Belt, including Iowa and Nebraska. Crop producers, crop scouts, students, and the general public may find this lesson helpful for obtaining information about developing a management plan to control corn rootworm.

Electrophoresis: How scientists observe fragments of DNA

Describes gel electrophoresis and how the method is used in molecular genetic analysis.

Flowering Principles

What is a "flower" and what are its structures? How do the male and female parts operate to produce seed? Monoecious versus dioecious; perfect versus imperfect.

Mitosis and Meiosis and the Cell Cycle

Understanding multicellular organisms requires an understanding of the lifecycle of the cells that make up the organism.

Overview of Plant Genetic Engineering

A general description of the overall process of genetic engineering. A basic explanation of the five steps for genetically engineering a crop is provided.

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 photosynthetic pigment, which are protein complexes that harvest light and convert its energy into biochemical energy will be explained.

Propagation and Procreation - More of a Good Thing

-Creating unique individuals or perfect little clones -Genetics of it all -Peas in Darwin's pods

Theories Behind Plant Tissue Culture

When introducing a foreign gene into a target genome in plant tissue, you need to grow the transgenic cell to a complete plant. This is done by plant tissue culture, a biotechnique based on the concept that an organ, tissue or cell of a plant can be manipulated to grow back into a complete plant.

Transformation 1 - Plant Tissue Culture

This lesson explains the technique of tissue culture as used in plant transformation. It discusses important issues, such as the use of selectable markers, genotype specificity, and tissue culture alternatives.