Agricultural Biotechnology Introduction

Agricultural biotechnology includes a range of tools that scientists employ to understand and manipulate the genetic make-up of organisms for use in the production or processing of agricultural products.

Why is agricultural biotechnology important?

In a world where 800 million people, living mostly in rural areas, go hungry every day, food demand is set to double in the next thirty years and arable land is limited, advances in agriculture are critical if we are to reduce hunger and promote growth and development in a socially acceptable and environmentally sustainable way.

1) Crop Improvement ResearchVery rudimentary

biotechnology.“Artificial Selection”Based on basic Mendelian

genetics where two plant types of the same species are crossed to produced a better plant type.

Example: Crossing a plant that has a high tolerance to disease with a plant that has a high fruit yield gives you a disease resistant plant with a high fruit yield.

Current Areas of Research

2) Creating Gene BanksA gene bank is large holding of plant types with

their given traits and now with the genes for these traits genetically marked.

Crop scientists can now select a variety known to hold a specific characteristic, mark the gene responsible for the trait and cross it with another variety known to hold a second desirable characteristic.

These techniques are simply traditional breeding techniques made more efficient by new information about genes and new technologies.

3) Genetic ModificationInserted genes from

other species into plants/animals in order to increase yields or protect against pests or environmental conditions.

They are tested to ensure no adverse environmental or health effects.

1) Induced Mutation Assisted Breeding (IMAB)

Mutations are the cause of “better” varieties of plants.

In the 1970s, the International Atomic Energy Agency (IAEA) and the Food and Agriculture Organization of the United Nations (FAO) decided that it would be a good idea to speed the process along.

Examples of Agricultural Biotechnology

1) Induced Mutation Assisted Breeding (IMAB)

They subjected many plant varieties to mutagenic agents (like radiation) to induce mutations and then selected for the desired “new” traits that appeared.

IMAB has resulted in the introduction of new varieties of many crops such as rice, wheat, barley, apples, citrus fruits, sugar cane and banana.

The only drawback is ensuring the mutagenic agent is not passed into the food item.

2) MicropropagationMicropropagation involves

taking small sections of plant tissue, or entire structures such as buds, and culturing them under artificial conditions to regenerate complete plants.

Micropropagation is particularly useful for maintaining valuable plants, breeding otherwise difficult-to-breed species (e.g. many trees), speeding up plant breeding and providing abundant plant material for research.

2) Micropropagation of Bananas in Kenya

Micropropagation represents a means of regenerating disease-free banana plantlets from healthy tissue.

In Kenya, banana shoot tips have been successfully tissue-cultured.

An original shoot tip is heat-treated to destroy infective organisms and then used through many cycles of regeneration to produce daughter plants.

A single section of tissue can be used to produce as many as 1 500 new plants through ten cycles of regeneration.

Micropropagation of banana has had a tremendous impact in Kenya, among many other countries, contributing to improved food security and income generation.

It has all the advantages of being a relatively cheap and easily applied technology and one that brings significant environmental benefits.

3) Genetic EngineeringThere are three levels of genetic engineering:a)Close transfer: taking a gene from one plant

species and inserting it into another plant species (same kingdom)

b)Distant transfer: taking a gene from one species and inserting it into another species from a different kingdom (i.e. bacterium gene into a plant)

c)“Tweaking”: the genes already present in the organism are “tweaked” to change the level at which a particular protein is made

All of the above would create a GMO.

3) Genetic Engineering Example: The Protato

Researchers at Jawaharlal Nehru University in India have developed a genetically engineered potato that produces about one-third to one-half more protein than usual, including substantial amounts of all the essential amino acids.

Protein deficiency is widespread in India and potato is the staple food of the poorest people.

The “protato” was developed by a coalition of Indian charities, scientists, government institutes and industry as part of a 15-year campaign against childhood mortality.

The campaign aims to eliminate childhood mortality by providing children with clean water, better food and vaccines.

The protato includes a gene from the amaranth plant, a high-protein grain that is native to South America and widely sold in Western health-food stores.

The protato has passed preliminary field trials and tests for allergens and toxins.

Final approval from the Indian Government is probably at least five years away.

4) Artificial insemination (AI) and multiple

ovulation/embryo transfer (MOET)

These processes have aided the global diversity and strength of livestock.

AI is the transfer of sperm and MOET is the transfer of ova or a fertilized embryo from an animal in one part of the world, to an animal in another part of the world.

The drawback is the need for a well organized and funded farm to do this.

Food Biotechnology Introduction

Food biotechnology is the application of technology to modify genes of animals, plants, and microorganisms to create new species which have desired production, marketing, or nutrition related properties.

Called genetically engineered (GE) or genetically modified (GM) foods, they are a source of an unresolved controversy over the uncertainty of their long-term effects on humans and food chains.

Nicknamed “Frankenfoods” by anti-GM food groups.

1) Extended Shelf LifeThe first steps in

genetic modification were for food producers to ensure larger profits by keeping food fresher, longer.

This allowed for further travel to and longer availability at markets, etc… Extended Shelf Life

Milk

Why genetically modify food? Here are some examples:

Example: Long Shelf TomatoesThese genetically modified

tomatoes promise less waste and higher profits.

Typically, tomatoes produce a protein that softens them after they have been picked.

Scientists can now introduce a gene into a tomato plant that blocks synthesis of the softening protein.

Without this protein, the genetically altered tomato softens more slowly than a regular tomato, enabling farmers to harvest it at its most flavorful and nutritious vine-ripe stage.

2) Efficient Food ProcessingBy genetically

modifying food producing organisms, the wait time and quantity of certain food processing necessities are optimized.

Again this is a money saver.

Although efficient, this type of food processing is not an example

of biotechnology.

Example: Rennin ProductionThe protein rennin is used to

coagulate milk in the production of cheese.

Rennin has traditionally been made in the stomachs of calves which is a costly process.

Now scientists can insert a copy of the rennin gene into bacteria and then use bacterial cultures to mass produce rennin.

This saves time, money, space and animals.

Rennin in the top test tube… not there in the

bottom one.

3) Better Nutrient CompositionSome plants, during

processing, lose some of the vital nutrients they once possessed.

Others are grown in nutrient poor areas.

Both these problems can be solved by introducing genes into plants to increase the amount or potency of nutrients.

“Biofortification”

Example: Golden RiceScientists have engineered "golden rice", which has received genes

from a daffodil and a bacterium that enable it to make beta-carotene.

This offers some promise in helping to correct a worldwide Vitamin A deficiency.

4) Efficient Drug DeliveryInserting genes

into plants/animals to produce essential medicine or vaccines.

“Biopharming”

Potential Problems???With every

technology there is an associated risk involved.

The following are some examples of potential problems associated with food biotechnology.

1) Creating “Superbugs”Since many of the

“vectors” used to introduce genes to plants and animals are bacteria and viruses, it is realistic to think there is a chance they could undergo a mutation and prove harmful or become recombinant like the H1N1 virus and thus more virulent.

However, the bacteria and viruses used in these procedures are usually non-pathogenic. Viruses Bacteria

2) Negative Affects on Human Health

Most of these food products undergo testing to see if any adverse health effects occur.

However, allergies were not thought of in one case where a gene from a brazil nut was transferred to soy bean plants!

Thankfully a food product was not pursued as someone came to their senses!

Important to note that not all genes from a potential allergenic food will cause an allergy.

3) EthicsHow many human

genes would an organism have to have before you consider it human???

The following food types have a variety with human genes added: rice (immune system genes that prevent diarrhea), baby food (lactoferrin and lysozyme) and any farm animal (Human growth hormone).