A biofortified rice high in iron and zinc is set to combat hidden hunger in developing countries

August 18, 2016 by Andrew Trounson
Credit: University of Melbourne

Rice is the staple food for billions of people throughout the developing world. But beyond easing hunger pains and providing carbohydrates for energy, it has little nutritional value.

It means many people who depend on as a staple food are effectively being starved of essential micronutrients such as iron, and pro-vitamin A.

Nutritionists call it "hidden hunger."

The World Health Organisation estimates two billion people, or 30 per cent of the world's population, are anaemic, in many cases due to iron deficiency. This condition leaves people weak and lethargic and poses a significant and even fatal health risk to pregnant women and their children. Equal numbers are at risk of zinc deficiency with severe health consequences including stunted growth and impaired immune function.

But researchers are now on the cusp of making a real difference. University of Melbourne plant geneticist Dr Alex Johnson and colleagues have created a genetically modified (GM) rice that produces grain with significantly more iron and zinc through a process called biofortification. And field trials have now shown that the biofortified rice is just as high yielding as conventionally bred rices.

Field Trial Success

In results recently published in Scientific Reports, an open access journal from prestigious scientific publishers Nature, Dr Johnson and colleagues describe how they were able to grow iron and zinc biofortified rice plants in the field. Rice grains usually contain just 2-5 parts per million (ppm) of iron. The researchers were aiming to increase that to at least 13 ppm to address iron deficiencies in rice-based diets. They managed to get to 15 ppm. Similarly, they had been targeting to increase the amount of zinc from 16 ppm to 28 ppm, but they managed to get to 45 ppm.

"The results shows that this technology actually works in the field, not just in the glasshouse," says Dr Johnson, from the School of BioSciences. "We exceeded our biofortification targets and the rice was just as high yielding as existing rice varieties.''

Crucially, the field-testing also showed that while the genetic modification had enabled the biofortified rice to take up more iron and zinc from the soil, it didn't increase the take up of harmful heavy metals such as cadmium.

Finally, nutritional testing of grain produced in the field trials showed that if we were to eat this rice, our bodies would readily absorb the increased quantities of iron and zinc. The scientists were able to determine this by "feeding" the rice to so-called Caco-2 cells, which are a human cell line that can be grown in the lab to resemble cells of the small intestine. The biofortified rice was "fed" to the Caco-2 cells by first artificially "digesting" it using enzymes that mimic our own digestive process.

"There are no deal breakers in these results. We have proven our concept in a major variety of rice, and we are now ready to move this into a developing country," says Dr Johnson.

"Rice is the for billions of people today and that isn't going to change anytime soon, so rice biofortification is a tool that we can use to address hidden hunger in a huge number of people.

"Over time that should lead to healthier and more productive populations in the developing world, boosting local economics and eventually supporting more diverse and balanced diets.

Fishing among rice fields in Bangladesh. The country could be the first where iron biofortified rice is released. Credit: Michael Foley/Flickr

"We can and do use vitamin and mineral supplements and food processing to help people suffering from micronutrient deficiencies, but those interventions are recurrent costs and need industrial processing that may not be readily available in developing countries. Biofortification is a sustainable solution because once it's in the seeds you've increased the nutritional quality of the crop itself. The farmer simply needs to plant biofortified seeds."

Targeting the right gene

Dr Johnson's research has been funded and supported by several partners including the Australian Research Council and the not-for-profit HarvestPlus initiative. HarvestPlus is backed by the Bill and Melinda Gates Foundation and is tackling hidden hunger in developing countries with biofortified crops. Dr Johnson's ambition is that farmers around the world would face no additional cost for adopting the iron and zinc biofortified rice.

Dr Johnson, an American who later also became an Australian, did his PhD at Virginia Tech in the US where he worked to genetically modify potatoes to create resistance to the Colorado Potato Beetle.

At the University of Melbourne he has been working on genetic strategies to boost the iron content of rice since 2009. In 2011, his team identified a specific rice gene that when "switched on" increases the amount of iron taken up from the soil and transported to the grain. Usually this gene is only activated when the itself is short on iron, but by modifying what drives the gene they were able to keep the gene switched on all the time. "We have basically tricked the plant into thinking it is continuously short of iron."

They also found that it increased the uptake of zinc. "It was a dream result," says Dr Johnson.

His fascination with plants goes back to his childhood when he was enthralled by seeds growing into something that his family could eat. He remembers following his mother around the garden and impatiently digging up her plants to see what they looked like as they were growing. Now as a scientist, he has had to learn the patience of a good gardener.

"Given the huge opportunity we have here to fight human malnutrition, there are times when the project doesn't seem to be going fast enough. But plants can only grow so fast and we need time for replicated field trials in multiple countries. It's important that we fully understand how our biofortified rice grows in as many different environments as possible."

Dr Johnson and his colleagues are now aiming to introduce the iron and zinc biofortified rice into Bangladesh where almost 80 per cent of cultivated land is dedicated to rice, but where more than half of all children and 70% of women are iron deficient. He says biofortified rice could have a huge impact in this country.

Real solution for real problem

Another reason that the team is targeting Bangladesh is that it has already released other GM crops such as an eggplant variety that has allowed farmers to drastically reduce their insecticide use.

GM crops are controversial because of concerns from some, including Greenpeace, that such crops may have unforseen consequences that could eventually harm the environment and pose a health threat. But Dr Johnson says that there is a wealth of information showing that GM crops are safe and notes that over a hundred Nobel Prize winners from a range of mostly science disciplines, recently penned a letter asking Greenpeace to end its opposition to genetically modified organisms.

"Hidden hunger isn't a hypothetical problem, it is a real problem, and biofortification is a real solution. I've not met anyone who is against that."

Explore further: Iron deficiency in children resolved by biofortified pearl millet

More information: Kurniawan R. Trijatmiko et al. Biofortified indica rice attains iron and zinc nutrition dietary targets in the field, Scientific Reports (2016). DOI: 10.1038/srep19792

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16 comments

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rderkis
5 / 5 (2) Aug 18, 2016
GMOs will feed the world, in places where people literally watch their children starve to death! . :-)
ROBTHEGOB
3 / 5 (2) Aug 19, 2016
Just what we need - more Frankenfood. What we really need is birth control.
tinitus
Aug 19, 2016
This comment has been removed by a moderator.
rderkis
5 / 5 (1) Aug 19, 2016
This is just a naive attempt for monopolization of rice agriculture which could have disastrous consequences.


And tinitus, what do you call the consequences of starvation?
I would be willing to bet either one of you (ROBTHEGOB, tinitus) every cent I have aginst $1 of your money, that if your child was dying of starvation in your arms you would sing a different tune.
Or don't you have any empathy for the children that are starving to death as we speak?
Perhaps instead of worrying about what might be, we should face what's happening right now.
tinitus
Aug 19, 2016
This comment has been removed by a moderator.
rderkis
5 / 5 (1) Aug 19, 2016
These people starve, because they cannot afford even the normal rice,


Perhaps I am wrong, you tell me. I thought the price of rice was pretty much determined by supple and demand. Obviously the demand is high because supply is to low. If we can use GMOs to produce higher yield crops then the price will eventually go down. As far as anyone making money for their efforts, more power to them. I am not jealous or envious. Any more than I think you are way overpaid for your job skills compared to the rest of the world.
Another way to look at that is explained anticodally. I had two brothers at work, the one was always preaching how we stole all the land from the Indians. We got tired of his preaching about it. One day his brother came in and suggested he give the land back by giving the Indians by giving them his property deed. We never heard anouther peep from him. In other words if you feel the price is to high you could chip in with say 2/3rd s of your pay check.
tinitus
Aug 20, 2016
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tinitus
Aug 20, 2016
This comment has been removed by a moderator.
svpl3397
not rated yet Aug 21, 2016
This are stupid bullshit. Similar ideological hogwashs of green idiots are responsible for the death or blindness millions people. Golden rice is not corporate product but a university project. The seeds have to be purchased even in case NON GMO crop cultivation. The idea that anyone is able to efficiently distribute vitaminis between paupers of east Asia or Africa and save everyone from blindness or death is enormously stupid. Golden rice could save these people.
tinitus
Aug 22, 2016
This comment has been removed by a moderator.
humy
5 / 5 (1) Aug 24, 2016
Just what we need - more Frankenfood.


If this 'Frankenfood' saves poor people from malnutrition, yes, that is exactly what we need. Just idiotically labeling it 'Frankenfood' doesn't make it a bad thing. This is proof (not that any is needed for the rational mind) of how GM food can be a good thing.
humy
not rated yet Aug 24, 2016
These people starve, because they cannot afford even the normal rice, not to say this expensive GMO one. Don't forget, the seeds of GMO plants must be bought each year, you cannot regrow them from your own seeds. Just because I've empathy for poor children, I cannot imagine how they could fit the marketing model of GMO corporations.

What are you talking about?
None of this is true.
You can make GMO crops that can produce viable seed that can be used for next years crop and the link in a round-about way indirectly implies this with the words;

"...Dr Johnson's ambition is that farmers around the world would face no additional cost for adopting the iron and zinc biofortified rice...."

and there is no logical reason to suppose this cannot be done nor that GMO would be more expensive to buy as the price of food has extremely little if anything to do with GMO.
tinitus
Aug 24, 2016
This comment has been removed by a moderator.
tinitus
Aug 24, 2016
This comment has been removed by a moderator.
humy
not rated yet Aug 24, 2016
You can make GMO crops that can produce viable seed that can be used for next years crop


Maybe you can, so why the silencer genes are introduced into every GMO artificially?


1, that isn't true. There are plenty of GMO food crops not containing "silencer genes" in partilular.
2, your obviously massively biased link doesn't mention "silencer genes" anywhere and is obviously just part of an extremely hateful propaganda campaign against Monsanto from some extremist environmentalist and I say this as someone with real genuine environmental concerns and wanting something to be done about global warming, local pollution etc.
3, what has "silencer genes" got to do with it? If you understand genetics like I do, you would know you can have crops with "silencer genes" producing plenty of seed. In fact, many "silencer genes" naturally exist in most if not all non-GMO food crops if what you mean by "silencer genes" is genes that turn other genes off.
humy
not rated yet Aug 24, 2016
The autoimmune diseases http://www.truth-...ominator - and IMO it's time to put the question, what's actually going on...

if you are implying that GMO crops are causing that, I should point out that there is no premise for that whatsoever and your link doesn't suggest a GMO causal link.

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