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March 13, 2011

As disease threatens country's staple banana food, Ugandan scientists grow GM varieties

by Xan Rice

Most countries would resent being called a banana republic. Uganda prides itself on it. A typical adult here eats at least three times his or her body weight in bananas each year, more than anywhere else on Earth. Different varieties are steamed, boiled, roasted, turned into gin and beer, or simply peeled and eaten raw, such as the tiny sukali ndizi, considered by some experts to be finest banana in the world.

"Breakfast, lunch and dinner, 365 days a year," said Arthur Kamenya, whose taste for the fruit is so strong he quit his job as a graphic designer to grow it commercially. "And people still crave more."

But it is a craving under threat. In recent years a devastating bacterial disease has swept across Uganda and, to a lesser extent, neighbouring countries, causing annual banana crop losses to the region of more than $500m (£310m). The rapid spread of banana Xanthomonas wilt, or BXW, which destroys the entire plant and contaminates the soil, "has endangered the livelihoods of millions of farmers who rely on banana for staple food and income", according to an article in the journal Molecular Plant Pathology last year.

With no resistant varieties or chemical cures available, growers such as Kamenya have been forced to destroy large sections of their plantations. For smaller farmers the damage has been so severe many have given up on the fruit.

But local scientists have not. On a sprawling campus outside Kampala, Wilberforce Tushemereirwe and his colleagues at the National Banana Research Programme have been on a quest to defeat the disease by building a better banana. This has involved adding to the fruit a sweet pepper gene that has already improved disease resistance in several vegetables.

Laboratory tests on the genetically modified bananas have been highly promising, with six out of eight strains proving 100% resistant to BXW. Field tests have now started in a fenced-off, guarded plot on the edge of the campus.

Results from the trials, expected later this year, could have a strong bearing on the country's future food security – and indeed its entire policy on agriculture. GM crops are still banned in Uganda, and the scientists had to get special permission just to conduct their tests. While acknowledging that it is a highly controversial topic, Tushemereirwe says the risk of doing nothing is too great.

"If we just leave this, bananas will slowly disappear from Uganda," he said.

BXW was first reported in Ethiopia in the 1960s, but was only identified further south in 2001, initially in Uganda and then Rwanda, the Democratic Republic of Congo, Kenya, Burundi and Tanzania. Uganda was particularly vulnerable because of the scale of its banana production, second only to India which has a population 35 times larger.

With a single plant lasting for many years and providing a large bunch of fruit every few months, bananas are a key crop for small farmers. They are also a crucial source of sustenance, accounting for more than 30% of Ugandans' daily calorie intake. According to Tushemereirwe, the average adult eats 200-250kg (440lb-550lb) of bananas a year – and twice that in some areas.

Most of that is matooke, a long green banana, which is usually steamed and mashed and eaten with beans, peanut sauce or meat. That's what Kamenya planted six years ago on his farm in Galamba, about an hour's drive from the Ugandan capital. But soon he realised some of the plants were sick, with yellowing leaves and the fruit ripening prematurely.

Kamenya, a powerfully built 37-year-old, was forced to dig up 1,500 of his 4,500 plants, destroy them, and allow the soil to lie fallow for at least six months. He also had to sterilise his farm tools. This eventually helped control the disease, though he still has problems. "Look how this plant has rotted," he said, slicing through the trunk of a banana plant with a knife to reveal yellow ooze.

Few areas of Uganda have escaped the disease, which is transported by insects such as bees and wasps. But traditional farming practices also ensured its rapid spread. Infected "suckers" – young shoots of banana plants – are shared with neighbours, while the use of banana leaves to cover bunches of fruit headed to market quickly transferred the disease to new areas.

In central Uganda, one of the main banana-growing regions, BXW hit up to 80% of farms, sometimes wiping out entire fields. Small-scale farmers, who could not afford to let their gardens lie empty for months before replanting, switched to other crops.

Tushemereirwe, with the International Institute for Tropical Agriculture (IITA) and African Agricultural Technology Foundation (AATF), decided a GM solution was the best way forward. Academia Sinica, the Taiwanese research institute that pioneered the sweet pepper gene technology, agreed to issue them with a royalty-free licence. The sweet pepper gene – successfully transplanted into the other vegetables, but never before a banana – produces a protein that kills cells infected by disease-spreading bacteria.

Leena Tripathi, a plant biotechnologist at IITA who helped steer the project, said introducing the gene did not affect the quality of the banana and presented no health risks. "The beauty of the genetic engineering is that you can be very precise," she said.

Other GM banana experiments are under way in Uganda, including one to fortify the fruit with iron and vitamin A. But concern about GM foods in Uganda means they could face a long battle before any of the transgenic bananas find their way on to the market.

A study by Enoch Kikulwe, assistant professor of international food economics at the University of Göttingen, Germany, revealed more opposition to GM crops among the elite than those in poorer villages. Most studies show that better education led to more acceptance of GM foods, he said.

But for Kamenya the farmer, – who falls into the elite category – the anti-GM stance was hypocritical. "Most of the people against this have choices," he said, a pot of matooke steaming nearby. "Somebody who is hungry does not have a choice. GM, organic or whatever – you have to feed the people."
How to eat them, Uganda style

The super-sweet dessert bananas are the easy option. The home-brewed banana gin is a choice for only the highly adventurous. For authenticity, however, matooke, the national staple that looks like buttery mashed potato on the plate, is the only way to go.

Also known as east African highland bananas, the green matooke fruits are for cooking only – ideally steamed on an open fire. To start, water is poured into a large pot and covered with banana stalks. The peeled bananas are wrapped in the plant leaves, with the bundle lowered into the pot, resting on the stalks, above the water.

The fruit is then steamed for a few hours, going from hard to soft, white to yellow. Still wrapped in the leaves, the bananas are then mashed.

The dish can then be served on a new leaf, together with beans, other vegetables or peanut sauce.

It is an acquired taste, and to the uninitiated it can seem heavy and bland. But once you've got it, Ugandans say, there's no going back to rice and potatoes.

The Guardian 


Uganda's disease-hit banana crops will not be saved by GM science

by Emma Hockridge

Your report states: "A plant disease has led to devastating crop losses. GM could be the only answer" (A nation's staple is under threat – but can science save Uganda's bananas?, 9 March). Readers with long memories will recall that the promise of the GM industry to save banana crops has been around for ages (at least since 2001), without any evidence to back it up so far.

Despite vast amounts of time and money put into research, and PR invested in its promotion, GM has failed to deliver. Your report claims "laboratory tests on the genetically modified bananas have been highly promising", yet many other GM crops never pass the field trial stage because they are just not suited to practical farming systems, or behave in ways which are unexpected. According to the United Nations Food and Agriculture Organisation, the biggest threat to the health of the banana arises from genetic uniformity, ie not enough variety in its genetic stock. Genetic engineering actually reinforces this uniformity.

Better resilience would come from farmers using a greater diversity of crops alongside proven and effective growing techniques – such as using crop rotation to help build soil fertility and plant health naturally. These so-called "agro-ecological" solutions are increasingly being championed by the UN and development organisations, because they offer a much better deal for farmers, and food production that doesn't depend on chemicals and oil-based fertilisers.

The UN's "green Marshall Plan", published recently, argued that large-scale, chemical-intensive approaches to agriculture are not the best way to increase food production. It instead promotes the benefits of agro-ecology for developing countries, which improves their resilience to climate change. Research from the UN has shown adoption of organic and near-organic farming practices in Africa has doubled yields. The claim in your report by Leena Tripathi of the GM research body, the International Institute for Tropical Agriculture, that "the beauty of the genetic engineering is that you can be very precise" has not been borne out by facts.

In the early days of GM, the Soil Association and other opponents of genetic engineering believed that it was a highly risky and uncertain technology. Developments have shown this to be true. Evidence is continually mounting of the problems that growing GM crops are causing: weed resistance to glyphosate has become a major problem in GM herbicide tolerant crops, while the cost of GM seeds is cutting into farmers' incomes in the US.

To market GM as a panacea to issues of food security is not borne out by the facts, and to try and dupe farmers in developing countries into accepting this is simply dishonest. The future of feeding a growing world population, in the face of all of the challenges of climate change and resource depletion that face us, is crop variety, soil fertility, and farming systems like organic which don't rely on costly inputs. Not chemical and agribusiness controlling the research and food markets of a GM-inspired future.

Guardian Comments

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