Showing posts with label conventional breeding. Show all posts
Showing posts with label conventional breeding. Show all posts

Friday, December 5, 2008

Conventional Breeding vs Genetic Modification (Part 2)

I got an interesting comment on my article posted sometime ago: http://malaysia4biotech.blogspot.com/2008/07/conventional-breeding-vs-genetic.html.

I started responding to the comment and it got too long, that I decided to post it as an article. Here is my response:

We have to first understand that there is nothing such as absolute safety. But what we can safely say is that in spite of many anti GMO claims, GM crops present not new or different risks. National Academies, Royal Societies and Scientific Societies around the globe have reviewed the underlying science and all have come to the same conclusion. The technology is more precise and better defined than conventional plant breeding and it produces fewer and smaller genetic changes. When regulators in the EU or Australia or Japan approve a new GM crop, they do it with the certainty that it is as safe as any other crop. Determined anti GM activists have spread all sorts of fears about the technology but the scientific community believes that when newly developed GM products are approved by regulators the world over, they are the best studied and safest crops we have ever planted.

There is an extensive scientific literature on safety studies and thousands of papers about safety of specific crops. None of these reveal any flaws in the case-by-case assessment process. Those kinds of studies have been independently done and published. When anti GM activists have no answer for the facts the only thing they can do is try to impeach the source in the hope that listeners will believe them without consulting the literature.

There is more research on GM crops being done in the public sector and in developing countries than there is in the private sector. Big companies have given their technology free of charge to projects designed to help the poor and hungry. People who run misinformation campaigns know that it is always a good idea to give the audience a villain to hate. Many of the arguments against biotech companies are simply anti-globalization and anti-capitalist arguments. It would be better if this debate were held on the merits of globalization and capitalism rather than through a back door attack on a surrogate produced by companies—in this case, GM crops. Personally, I find things produced by giant companies very useful. They produced my computer, my car, the food I eat, the clothes I wear, the communication systems I use, and the energy that cools and powers my house. To those all anti-industry individuals out there, I say – please stop using any products produced by the industry...

I agree completely that it depends on who one listens to and who one believes. One should be very careful in choosing who to believe. In this debate there are giant companies trying to sell products but there are also anti-GM activists whose livelihood comes from continual campaigns against this and other technologies. I have chosen to believe the consensus of the scientific literature. In this case there are numerous peer-reviewed papers that document large reductions in chemical use associated with a switch to GM crops (see Brooks and Barfoot, Pray et al. etc). Given the staggering amount of evidence on this topic it is amazing that those who oppose the technology still go on spreading junk science, oblivious to all the scientific evidence.


That is also another fallacy generated by opponents of GM crops. Saying something again and again doesn’t make it true. FAO says there is not only not enough food in the world to feed the world population and that the situation is getting worse by the day. Food reserves have fallen to all time low and food prices are near all time high. In spite of the Millennium Goals, the number of hungry is going up not down.

Risk analysis is a comparative process in which we analyze one product or process against another. When we compare GM crops with conventional crops we conclude they are actually safer. That’s a scientific risk assessment. It does not mean that conventionally bred crops are unsafe—not at all, we eat them every day and know that they are safe. It does mean that GM crops are no more risky and are usually less risky than conventional foods. There are no villains, monsters or heroes here. Just foods that is as safe as others. The point being made is simply that there is more uncertainty with conventional crops than GM crops, more changes in the DNA could have taken place, composition could have changed more dramatically, and there is a greater risk of producing toxicants or allergens by conventional breeding than there is with GM crops. But none of this means conventional crops are any less safe than we know them to be—it is merely a good way of putting GM crops in the proper perspective to compare their safety with that of conventional crops.

By Mahaletchumy Arujanan

Thursday, July 31, 2008

Conventional Breeding Vs Genetic Modification

Have a look at the pictures below. These are pictures of the wild parents of some of the vegetables we consume almost every day. Try identifying them and guess their offspring. The wild varieties have undergone tremendous evolution due to conventional breeding. The answers are at the end of the article.
Genetic Modification or GM technology has been singled out by activists to create alarm and fear among the public. The scaremongering of this technology is often not based on solid scientific principles but based on emotions, personal beliefs and sentiments. However, the scaremongers and naysayers should realise that their actions are causing huge economic loss to Malaysia. With the current global food crisis and price hike, we certainly cannot afford to overlook the potential of the technology which has been proven to be safe and in use for more than a decade. We import most of our food causing our food bill to skyrocket. Our poultry industry is entirely dependent on important soy and corn – almost all are GM.

Crops have been modified by human since time immemorial. None of the cultivated crops today exist in its original wild form. If they do, we will not be able to feed the world. In fact, the wild varieties will not even flourish under cultivated conditions. Modifying the genetic makeup of crops to develop better varieties was initially carried out through conventional breeding. Various methods are used, one of it using gamma radiation to produce mutants with beneficial traits. However, with conventional breeding, there is little or no guarantee of obtaining any particular gene combination from the millions of crosses generated. Undesirable genes can be transferred along with desirable genes; or, while one desirable gene is gained, another is lost because genes of both parents are mixed together and re-assorted more or less randomly in the offspring. These problems limit the improvements that plant breeders can achieve. Another limitation to this technique is that hybrids can only be produced with the same species or between closely related species.

It is mind-boggling that the use of gamma radiation and its safety is never questioned. We are all aware of the serious implications of radioactive rays to human, animal and the environment. Moreover, the resulting variety may carry some toxic or allergen producing genes as the breeder has no clue of how the genes have recombined. Nevertheless, conventionally bred crops do not require any testing and approvals, unlike GM crops which are the most tested products in the history of mankind. Yet, they also invite the most public scrutiny and debate – thanks to opponents of GM technology and environmental activists!

In contrast to conventional breeding, genetic engineering allows the direct transfer of one or just a few genes of interest, between either closely or distantly related organisms to obtain the desired traits. Plants may also be modified by removing or switching off their own particular genes. Scientists who develop GM crops know exactly the sequence of the inserted gene, the exact location where the gene is inserted, the function of the gene, and the way it will be expressed.

Having had a look at the pictures above, we need to ask these questions:

1. Will we be able to feed the world with these wild varieties?

2. If plants have been modified in the past beyond recognition using conventional techniques and we have been consuming them without questioning the safety, why so much of uproar on a technology that has been rigorously tested, monitored, regulated and approved?

I am often perplexed by stand taken by environmentalists and other groups that oppose GM technology – they want to champion conservation of biodiversity, and healthy and safe food but at the same time reject a technology that can help produce more food on smaller land area, use less chemicals, and produce healthier food.

One thing is sure – we once had the luxury to reject GM food but we will not be able to continue this in the wake of the current global food crisis. There will come a time when we have the money to buy food, but there will be no sellers. Before this happens, the Malaysian agriculture sector need to adapt itself, evolve and embrace the latest technology to stay competitive and self-sufficient. Even Europe is reviewing their positions on GM crops and farmers and livestock producers are demanding for these crops to be approved.

Food for thought: Products and NOT processes should be regulated.
Picture 1: Parent stock of corn
Picture 2: Parent stock of lettuce
Picture 3: Parent stock of carrot


- Mahaletchumy Arujanan