A bottle of brandy “distilled from the essence of the coconut flower and … matured for a minimum of two years” is going for sale for a million bucks. Talk about value adding!
The rich tapestry of life
I hope I can finish posting this before the battery runs out on my laptop. It’s been one long power cut after another for the past couple of days and the one we’re experiencing at the moment started more than three hours back. Anyway, I thought this piece in EurekAlert really interesting and I couldn’t wait to blog about it. There’s this rare endemic plant on Mauritius called Trochetia blackburniana, you see, and it happens to be pollinated by the equally endemic gecko Phelsuma cepediana. But this is a day gecko, which means that to avoid predators they have to spend a lot of time hiding, and their favourite place for doing that is among the spiky leaves of Pandanus shrubs. Now, I’m not sure about Mauritius, but in lots of other places around the Indian and Pacific Oceans, Pandanus is a really useful plant: the fruits are eaten, the leaves woven into mats, people recognize and maintain dozens of varieties etc etc. So here’s something else that Pandanus is important for: protecting the pollinators of a rare Mauritian endemic.
P.S. Incidentally, Trochetia blackburniana, which is in the Malvaceae, seems to be one of the very few species of plants with coloured nectar.
Correction: Trochetia is actually in the Sterculiaceae. Apologies. Please read the comments for more interesting stuff on this genus.
Coconut information exchange
Google Groups and Yahoo Groups are really useful tools for networking and exchanging information on specific topics. There’s a Google Group on coconut which is really active and lively, and definitely worth keeping an eye on – and indeed joining – if you’re into things Cocos. All the more so as there’s a new addition to the information available, in the form of what promises to be a regular update from COGENT, the International Coconut Genetic Resources Network, on its poverty reduction activities. You can see the first newsletter here. Among various Yahoo Groups on coconut subjects there is the “People and Coconuts” group, which is described as being for people with “interesting coconut conundrums requiring answers.”
Mapping underutilized genomes
It seems you can hardly open a newspaper these days — or open a news website — without reading that someone somewhere has mapped yet another genome, whether human, Neanderthal, sheep, mouse or bee. It hasn’t received any press coverage at all, but the taro (Colocasia esculenta) genome has now been added to the list. CIRAD scientists working in Vanuatu, in the South Pacific, and others just announced this at the recent meeting of the International Society for Tropical Root Crops held in Kerala, India.
One thing to note is that these are not all really genome mapping projects. Despite the many headlines to that effect, scientists are not mapping the Neanderthal genome. What they’re doing is sequencing it — or a small bit of it. There is a difference.
Sequencing means determining the (correct!) order of all the DNA bases — the letters of the genetic code — of an organism. Besides some very fancy hardware and software, you need the DNA of just one individual to do this. Mapping is both rather less and rather more.
Less, because it only aims to determine the relative location of some major landmarks of the genome. That is, not the order of all the letters in the book of life, but rather the relative positions of the pages where some choice quotations can be found.
More, because some of those genomic landmarks may be close to genes associated with predisposition to a disease or some other interesting trait. To find that out you need DNA from whole families, or populations, rather than a single individual — in the case of taro, the family was all the progeny from a couple of crosses between local ni-Vanuatu varieties. You trace the inheritance of the trait you’re interested in together with that of specific “markers” (any observable variation in the DNA sequence), and, hey presto, if you’re lucky you have a much more readily documented proxy for the trait.
With the new genome map, we now have genetic proxies for things like the yield and dimensions of the underground corm of taro. This edible aroid is an important staple in Oceania and parts of South and South East Asia, Africa and the Caribbean, but there are few breeding programmes around the world, which is why it often ends up on lists of so-called “neglected and underutilized species.” This map should make it easier to screen the hundreds of seeds that can result from crossing two varieties and select only the best individuals for further testing (this is called marker-assisted selection). It should therefore stimulate people to set up taro improvement programmes.
These are much needed. Mainly vegetatively propagated by farmers, taro is genetically fairly uniform in many places, making it susceptible to pests and diseases. It was almost wiped out in the South Pacific country of Samoa in the mid-1990s by taro leaf blight, a fungal disease. It has recovered at least in part because a regional project (called TaroGen) was set up by Pacific countries with support from Australia to breed — in collaboration with farmers — and disseminate resistant varieties.
Biotechnology means GMOs to many people, but this is a case where biotechnology is facilitating conventional breeding — nothing to do with genetic engineering. It may not have made the news like other mapping projects, but the new genome map means taro breeding should prove a little bit easier in the future.
Syrian agricultural stats
You may remember a post some time back on an atlas of agriculture in Bhutan. Now here’s an on-line database of governorate-level agricultural statistics for Syria. Maybe not as nice as an atlas, but still pretty useful for planning agricultural biodiversity conservation. Especially as there is time-series data going back to 1985, which could be used to identify areas of genetic erosion through the (admittedly imperfect) proxy of decreasing total acreage. But when will agricultural statisticians and census-takers start collecting data on numbers of varieties, at least of staple crops?