Genetically engineered bananas work

Researchers in Israel reveal that several lines of genetically engineered bananas are more tolerant to the fungal disease black Sigatoka. This is interesting for lots of reasons. The variety they engineered, Cavendish, is practically the only variety in international trade (more’s the pity) so one could argue that this effort is protecting only those bananas enjoyed by relatively affluent consumers. It will not do much, other than as a proof of principle, for the hundreds of millions of people who depend on scores of banana and plantain varieties as a staple crop. Black Sigatoka is a menace, one of the reasons why conventionally-grown bananas receive more chemical fungicides than any other crop. But it could be argued that another disease, Panama disease Race 4, is currently a greater threat. It was Panama disease that wiped out the previous export banana, Gros Michel. And while there are fungicides against black Sigatoka, there are none effective against Panama disease.

But the thing I personally find most interesting about this research is my anticipation of the objections to it. None of the standard “scientific” objections can possibly apply, aside from possible effects on human health, which I imagine will be reasonably easy to test. I can’t wait.

An early look at an atlas of agrobiodiversity

On reading about the Atlas of Global Conservation here a few days ago, Nora Castaneda of Bioversity International’s Regional Office for the Americas sent me some of her own forays in that area, which are focused on plant species of agricultural interest. They’re still works in progress, and unpublished, 1 but definitely worth having a quick look at. The data comes from germplasm databases (SINGER, GRIN, EURISCO) and the databases put together for the GapAnalysis project, about which we have already blogged about here.

Here’s what the distribution of numbers of accessions of varieties of the major food crops in genebanks looks like. Dark brown means lots of different accessions (not varieties, mind!).

One has to wonder what’s going on in Spain. As I say, it’s a work in progress. A certain amount of data cleaning may still be necessary, for example to identify duplicates and take them out of the equation. And when Genebank Database Hell allows it should even be possible to take into account morphological and genetic diversity.

Anyway, here’s the distribution of richness of wild relative and landrace accessions of a number of major crops. Green means lots of species and landraces.

When finished, I think these maps will make a great complement to the Nature Conservancy’s Atlas. But would the biodiversity community be interested?

Women have better things to do

I could not have wished for a better reason to point to Fred Pearce’s article over at Yale Environment 360 than Gary’s comment on my post about bride prices in Tanzania. He pointed out that “It is an article of faith among many development thinkers that the path to development runs away from the land to the cities” because that’s where the opportunities are. And that do do that, “farming must be automated to substitute mechanical energy for human energy”. And he picked up my challenge by pointing out that “Improved farming is in the eye of the beholder to some extent, depending on how ‘improved’ is defined”. All of which leads inexorably to Pearce on how human ingenuity and energy have improved farming and life for people in Machakos, Kenya, and elsewhere.

Pearce visited places that had been written off as beyond help because their population so far exceeded their carrying capacity.

Since independence in 1963, the Akamba’s population has more than doubled. Meanwhile, farm output has risen tenfold. Yet there are also more trees, and soil erosion is much reduced. The Akamba still use simple farming techniques on their small family plots. But today they are producing so much food that when I visited, they were selling vegetables and milk in Nairobi, mangoes and oranges to the Middle East, avocadoes to France, and green beans to Britain.

What made the difference? People. They made this transformation by utilizing their growing population to dig terraces, capture rainwater, plant trees, raise animals that provide manure, and introduce more labor-intensive but higher-value crops like vegetables.

This is not an isolated example, Pearce says.

In the highlands of western Kenya, the Luo people showed me how they were replacing their fields of maize with a landscape richer both commercially and ecologically. They had planted woodlands that produced timber, honey, and medicinal trees. I saw napier grass, once regarded as a roadside weed, sold as feed for cattle kept to provide milk and manure.

Much of Pearce’s article is devoted to bolstering the “Malthus-was-wrong-human-ingenuity-will-save-the-day” line of reasoning that says humankind need have no fear of the (grim) reaper. At least, I think that’s what he’s saying, although he does seem to accept some limits to population. That’s not my point here. My point here is that the examples Pearce gives are precisely what I mean by improved agriculture, and any woman who could bring experience of that sort of diversified, problem-solving, optimizing approach to providing for her future family would be worth her weight in rubies. The big problem remains the “development thinkers” and their clients.

Agricultural experience is valuable

Women who have worked in the fields are more valuable than women who have worked as housemaids. Brendan Koerner reports on a study of bride prices in Tanzania which shows that “child labor in agricultural activities is significantly associated with better outcomes in terms of family wealth”. Koerner goes on to ask whether “if bride prices were abolished, would families be less inclined to put their daughters to work in the fields? That would seem to be a long-term good for a nation looking to decrease its reliance on farming.”

My question: why would Tanzania want to decrease its reliance on farming? Wouldn’t it actually like to improve its farming?

Answers on a postcard (whatever that is) please.

UK public asked to forget election, map cherries instead

In another example of “citizen science” the Natural History Museum in the UK is enlisting the help of the public in a survey of cherry trees.

The results will produce a map of cherry tree locations and their flowering and fruiting timings. It will give scientists a better insight into the cherry tree population and help them find out how climate change may be affecting the flowering and fruiting times.

You can read all about it on the NHM’s website, and follow progress on a handy map.

As I’ve probably said here before, I think this sort of approach could work really well with heirloom varieties. But I imagine not as many people will be interested in oats as in cherries.