Watermelon: Out of Africa

Summer here in Rome tastes of watermelon. So, as the temperature outside hit the upper 30s today, it was great to sit in air-conditioned splendour in the office this lunchtime, eat a slice of cocomero and read a paper on the origin of the crop in the latest GRACE, which has just come out. Fenny Dane and Jiarong Liu at Auburn have looked in detail at chloroplast DNA from material collected all over Africa in an effort to reconstruct the history of both the familiar fruit (Citrullus lanatus var. lanatus) and the related tsanna or citron melon, which is a different botanical variety (var. citroides) of the same species. It turns out that the split of var. lanatus and var. citroides from a common ancestor (C. ecirrhosus, maybe) is ancient. The citron melon split off independently in the area of Swaziland and South Africa, while the wild precursor of the cultivated watermelon has its roots, as it were, on the other side of the continent, in Namibia. The picture below (courtesy of GBIF) shows why watermelon does ok in the Italian summer heat. Its natural habitat is pretty much desert (the record is for an accession in the US National Plant Germplasm System).

melon.jpg

More on cowpea breeding

Hot on the heels of a recent nibble on breeding cowpeas for Striga resistance comes a paper in GRACE on the diversity being exploited by cowpea breeding programmes in the US and Africa. It turns out that these programmes are using non-overlapping sets of genetic material and that therefore

US and Asian breeding programs could increase genetic variability in their programs substantially by incorporating germplasm from West Africa, while national programs in West Africa should consider introgression of Asian germplasm and germplasm from other parts of Africa into their programs to ensure long-term gains from selection.

That’s what we mean when we talk about global interdependence in plant genetic resources, I guess. And that’s why the International Treaty was negotiated: to facilitate the exchanges of germplasm necessary to broaden plant breeding programmes worldwide.

More doom and gloom for agricultural research

I ((This article was sent in by Danny Hunter.)) was encouraged to read a couple of interesting news stories on SciDevNet highlighting useful efforts to improve scientific capacity in developing countries, only to be disheartened by another article identifying important gaps and weaknesses in many Poverty Reduction Strategy Papers (PRSPs) in this very area. PRSPs are the multi-year plans that developing countries now have to draw up and adopt as a pre-condition of support from funding agencies such as the World Bank. Not good news for agricultural research and researchers in these countries.

The article highlights a warning for the world’s poorest nations to place more emphasis on using scientific knowledge and technological innovation if they wish to escape growing unemployment and poverty. The warning is contained in a major report — “The Least Developed Countries Report 2007: Knowledge, Technology Learning and Innovation for Development” — published by the United Nations Conference on Trade and Development (UNCTAD).

The PRSPs seek to reduce poverty through sustained economic growth, but fail to give importance to the role of scientific and technological change in achieving sustainable development. No wonder national budgets and donor aid for science, technology and innovation in general, and for agricultural research and extension and capacity-building in particular, are dwindling. ((“…although agriculture remains the principal source of livelihood in LDCs, spending on agricultural research has fallen from 1.2 per cent of agricultural gross national product in the late 1980s to less than 0.5 per cent today.”)) While there are no easy solutions to this complex problem, the report does highlight strategies for donors and LDCs that can improve capacity for science, technology and innovation,

from encouraging “technological learning” in both “farms and firms”, to making better use of international legislation on intellectual property rights, and encouraging donors to increase support for what it describes as “knowledge aid”.

However, while it is important to make such high-minded pronouncements, let us not forget that individual scientists carrying out research in LCDs have much to offer on a day-to-day basis in terms of enhancing national scientific capacity. Such capacity-enhancing activities might involve providing training and mentoring to young scientists, helping young scientists and scientific groups to form networks, ensuring young local scientists are acknowledged and included as co-authors on scientific publications, and so forth. I am sure there are other, more innovative approaches to capacity-enhancing that have been used by scientists working in the field of agricultural biodiveristy. If so, I would love to learn about them.

Kutch’s wild ass and Important Plant Areas

I blogged about some recent additions to the list of World Heritage Sites a couple of days back, and now I’ve come across a potential new candidate, which should get in on the strength of its name alone: the Wild Ass Sanctuary in the Rann of Kutch. The wild ass in question is Equus hemionus khur, the Indian wild ass, a subspecies of the onager, the Asiatic wild ass. The khur’s habitat does sound fascinating:

The Rann, the last habitat of the wild ass (Equus hemionus khur) covering an area of 4954 sq. km is one of the most remarkable and unique landscapes of its kind in the world, which is considered as a transitional area between marine and terrestrial ecosystems. During the monsoons, while the entire area gets inundated, as many as 74 elevated plateaus stand out in the area. The sanctuary also houses 253 flowering plant species, 93 species of invertebrates and 33 species of mammals including the Khur sub-species of wild ass.

It would be great to have a protected area which is so strongly focused on the conservation of a wild relative of a domesticated animal. Wish there were more of them on the crop wild relative side. We’ve just heard that the international network of protected areas needs to do a better job of covering crop centres of origin and diversity. Now, Britain is hardly a centre of agrobiodiversity, but it does have a few crop wild relatives, so I wonder whether the British boffins who wrote the WWF report on protected areas and crop wild relatives had any input in selecting the just-announced Important Plant Areas (IPA) of the UK. I expect they tried their best, and the selection criteria do mention crop wild relatives, but it seems as if they were pretty much an afterthought:

The IPA project was conceived in Europe in response to the increasing rate of loss of the irreplaceable wealth of Europe’s wild flowers and habitats through rapid economic development, urbanisation, and habitat destruction. The IPA programme is a means of identifying and protecting the most important sites for wild plant and habitats in Europe. In addition to the protection this will offer to threatened habitats and species (higher, lower plants and fungi), IPAs will also offer protection to a wide range of species including medicinal plants, relatives of crop plants, veteran trees and many common but declining species.