Klaus Ammann, Hon. Prof. University of Bern, Switzerland Bellagio Rockefeller Foundation Seminar on Feral Crops April 26, 2004
Total Page:16
File Type:pdf, Size:1020Kb
Klaus Ammann, hon. Prof. University of Bern, Switzerland Bellagio Rockefeller Foundation Seminar on Feral Crops April 26, 2004 Ideal weed characteristics (after Baker, 1974): 1.Germination requirements fulfilled in a broad range of habitats 2.Discontinuous germination (internally controlled) and great longevity of seeds 3.Rapid growth through vegetative phase to flowering 4.Continuous seed production for as long as growing conditions permit 5.Self-compatible but not completely autogamous or apomictic 6.When cross-pollinated, unspecialized visitors or wind-pollinated 7.Very high seed output under favourable environmental circumstances 8.Produces some seed in wide range of environmental conditions; tolerant and plastic 9.Adaptations for short- and long-distance dispersal 10.If a perennial, vigorous vegetative reproduction or regeneration from fragments 11.If a perennial, brittleness, so not easily drawn from ground 12.Ability to compete interspecifically by special means (rosette, choking growth, allelochemics Hammer, K., Arrowsmith, N., & Gladis, T. (2003) Agrobiodiversity with emphasis on plant genetic resources. Naturwissenschaften, 90, 241-250 <Go to ISI>://000183825100001 or http://www.botanischergarten.ch/Feral/Hammer-P0DTA6LLA1PE9QET.pdf Our results clearly show a very pronounced influence of especially the frequency of parents and hybrids on their fitness (Fig. 2): B. napus, B. rapa and backcross plants (F1 ♀ x B. rapa) set many more seeds in pure stands than in mixtures and more seeds in stands with high frequencies of themselves. F1 plants set many more seeds in mixtures and at low frequencies of itself. Thure Hauser and Rikke Bagger Jørgensen Plant Environment Interactions Programme Development of three cultivated Brassica-species by species hybridization and allopolyploidization (haploid chromosome sets in red) (N. U, 1935; O. WINGE; 1917). The model could be confirmed by molecular analyses. Tested were the composition of a protein (ribulose-1,5-bisphosphate carboxylase) (M. B. ROBINS and J. G. VAUGHAM, 1983) and the structure of the respective gene (J. D. PALMER et al, 1983). Ribulose-1,5-bisphosphate carboxylase consists of a large (g) and a small (k) subunit. The different genotypes are marked 1 and 2 (blue). Brassica carinata, for example, contains the gene for the large subunit from Brassica nigra and that of the small subunit from Brassica oleracea. Additionally, genetic engineering was used. The scheme was supplemented by further species (more in: K. GLIMELIUS et al., 1991) European hunters and gatherers 10‘000 years ago Genetic 'signature' Lounes Chikhi, from University College London (UCL), UK, and colleagues looked for this marker by analysing mutations (errors) on Y chromosomes, the bundles of DNA handed down from father to son. Computer analysis In particular, they studied rare mutations called unique event polymorphisms (UEPs). These are not thought to have occurred more than once in recent human history. The presence of UEPs in different populations is likely to indicate common ancestry rather than recurrent changes in gene structure. The research team took the results of a previous study and subjected them to a new computer-intensive technique. From this, the scientists estimate that Middle Eastern farmers contributed about 50% of the analysed genes to the modern European population. Contributions ranged from 15-30% in France and Germany, to 85-100% in southeastern European countries such as Albania, Macedonia, and Greece. These figures are much larger than previous ones, suggesting that the Middle Eastern contribution to European genetic heritage has been underestimated. 1. Gatherer-hunters Gathering, hunting and fishing are successful forms of subsistence economy. 99 percent of human history and 90 percent of all human individuals which ever lived belong to this stage. Gatherer-hunter cultures have become rare nowadays and are mainly found in remote areas under extreme conditions (like desert, rain forest, tundra, high mountains) which may not be representative for study. In earlier days gatherer-hunters did not live on the edge of existence minimum but were allowed to be selective. The influence on the environment was low, but always density-dependent. Social organization was already characterized by labour partition between man and women, group formation, and territoriality. 2. Shepherd nomads (transhumance) Shepherd nomads prefer non-settled keeping and breeding of cattle and other domestic ani-mals. They are specialized on areas with low or unpredictable precipitation. Here field agri-culture without irrigation can not be carried out on a long term. The exact time of origin is unknown. There is a greater social differentiation (craftsmen, tradesmen). The number of animals is correlated to the social prestige. Shephard nomads are often involved in conflicts with other cultures because of alledged envi-ronmental damage caused by migrating herds. 3. Tillage or arable farming (field and garden) To be found since 8,000-10,000 years in Persia and Palestine. The starting point is called the „Neolithic Revolution“. a.Extensive forms (mainly based on subsistence economy) - Shifting cultivation, a sequence of repeated clearing, burning, tillage, and migration - Garden hoed crop culture (using a hoe, spade stick or similar tools) b. Intensive forms (true stationary life form). Work is done for not removing the land (soil cultivation, fertilization, crop rotation). True arable farming was particularly dependent of the use of effective ploughs. It was accompanied by a surplus economy which lead to - labour partitioning between towns and countryside, - keeping of stationary armies, - highly differentiated social labour division into class and caste systems, - population growth. Further properties are - the idea of landownership, - the inheritance of land (as private property), -the idea of nuisant plants and animals (weeds, pests). 4. Agro-industrial agriculture. Nowadays food production is based on the utilization of fossile energy (1-3 are based on enewable resources). Since c. 1850 agriculture is dominated by use of - artificial fertilizers, pesticides, insectizides, fungicides, - fuel for agricultural machines including the energy for the production of the machines, - energy for transporting good (both input and output of production). Shinden: Holy rice fields C, gods B came from mountains Man came from villages A The Fertile Crescent, 9000-4500 BCE Present-day distribution of wild emmer wheat, Triticum dicoccoides Triticum spelta Analysis of numbers of papers/mentions over time (Agricola database 1970-1996): : Source: AGRICOLA database (1970-1996) Common Name(s): spelt wheat www.hort.purdue.edu/.../ lecture14/fig_14-4.html 6080–6084 PNAS April 30, 2002 vol. 99 no. 9 A single domestication for maize shown by multilocus microsatellite genotyping Yoshihiro Matsuoka*†, Yves Vigouroux*, Major M. Goodman‡, J esus Sanchez G.§, Edward Buckler¶, and John Doebley* http://www.cec.org/files/pdf//Vaughan-e.pdf Great variety of chromosomal structures show that geneflow is not destabilizing the genomes of maize and teosinte Kato: Review of introgression between maize and teosinte Swiss landrace of maize from Thusis, Graubünden, Eastern Switzerland Poisoned fields: A contributor to collapse Mashkan-shapir was a typical Mesopotamian city, located about 20 miles from the Tigris River and connected to the river by a network of canals. Despite a flourishing civilization, Mashkan- shapir was abandoned within only 20 years of its settlement. What could have caused this rapid demise? Along with factors such as war and changes in the environment, scientists now believe irrigation techniques played an important role in Mashkan-shapir's collapse. The same process that allowed farming in this region also eventually made it impossible to farm. Irrigation has a Catch-22: if irrigation water is allowed to sit on the fields and evaporate, it leaves behind mineral salts; if attempts are made to drain off irrigation water and it flows through the soil too quickly, erosion becomes a problem. Deutschewitz, K., Lausch, A., Kuhn, I., & Klotz, S. (2003) Native and alien plant species richness in relation to spatial heterogeneity on a regional scale in Germany. Global Ecology and Biogeography, 12, 299-311 <Go to ISI>://000183686000005 or http://www.botanischergarten.ch/Feral/Deutschewitz-Archaeophytes-j.1466-822x.2003.00025.x.pdf www.nau.edu/~qsp/ macrobotanical_lab.html Ken Cole demonstrates proper midden analysis procedures www.nau.edu/~qsp/ macrobotanical_lab.html Sandra Swift purifies midden plant matrix through hydroclensing FIGURES 5-15. Plant macrofossils from late- Pleistocene Matianuck Avenue site (Connecticut), representing species present (5-10) and absent (11-15) from the contemporary alpine flora of the White Mountains: 5, 6, Harrimanella hypnoides, 5, branch with leaves, 6, capsule; 7-10, Salix uva-ursi, four different leaves; 11-13, S. reticulata, three different leaves; 14, 15, Thalictrum alpinum, two achenes. (All scale bars 1 mm.) http://www.erudit.org/revue/gpq/1999/v53/n1/004854ar.html Harrimanella hypnoides Padulosi, S., Hammer, K., & Heller, J.e. (1995) 4. Proceedings of the First International Workshop on Hulled Wheats © CAB ABSTRACTS, CAB International, Castelvecchio Pascoli, Tuscany, Italy, IS: 92-9043-288-8, pp 262 http://www.ipgri.cgiar.org/publications/pdf/54.pdf DISCOVERY OF RICE PHYTOLITHS IN THE NEOLITHIC SITE AT JIAHU OF HENAN PROVINCE AND ITS SIGNIFICANCE CHEN Baozhang , (Regional Development Institute