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      Maize on the Move: The Diffusion of a Tropical Cultivar across Europe

      Environment and History
      White Horse Press

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          Abstract

          This article examines the transfer and reception of maize into Europe in the wake of the Columbian Exchange. Treating maize as a plant - and reviewing familiar historical sources through the lens of the plant's likes and dislikes, its requirements and inherent traits - provides us with a novel source of information about how maize might have moved through European spaces, even in cases where the traditional historical record is silent. This article will make use of such data, employing current genetic research to interpret art and textual sources. I will show that all maize originally transported to Europe hailed from one slim gene pool. I will argue that the unique characteristics of those seeds impacted on the way maize fit into European ecosystems, and consequently into European cultures.

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          Most cited references5

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          Is Open Access

          Present and future Köppen-Geiger climate classification maps at 1-km resolution

          We present new global maps of the Köppen-Geiger climate classification at an unprecedented 1-km resolution for the present-day (1980–2016) and for projected future conditions (2071–2100) under climate change. The present-day map is derived from an ensemble of four high-resolution, topographically-corrected climatic maps. The future map is derived from an ensemble of 32 climate model projections (scenario RCP8.5), by superimposing the projected climate change anomaly on the baseline high-resolution climatic maps. For both time periods we calculate confidence levels from the ensemble spread, providing valuable indications of the reliability of the classifications. The new maps exhibit a higher classification accuracy and substantially more detail than previous maps, particularly in regions with sharp spatial or elevation gradients. We anticipate the new maps will be useful for numerous applications, including species and vegetation distribution modeling. The new maps including the associated confidence maps are freely available via www.gloh2o.org/koppen.
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            The genetics of maize evolution.

            Maize and its closest wild relatives, the teosintes, differ strikingly in the morphology of their female inflorescences or ears. Despite their divergent morphologies, several studies indicate that some varieties of teosinte are cytologically indistinguishable from maize and capable of forming fully fertile hybrids with maize. Molecular analyses identified one form of teosinte (Zea mays ssp. parviglumis) as the progenitor of maize. Analyses of the inheritance of the morphological traits that distinguish maize and teosinte indicates that they are under the control of multiple genes and exhibit quantitative inheritance. Nevertheless, these analyses have also identified a few loci of large effect that appear to represent key innovations during maize domestication. Remaining challenges are to identify additional major and minor effect genes, the polymorphisms within these genes that control the phenotypes, and how the combination of the individual and epistatic effects of these genes transformed teosinte into maize.
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              Out of America: tracing the genetic footprints of the global diffusion of maize.

              Maize was first domesticated in a restricted valley in south-central Mexico. It was diffused throughout the Americas over thousands of years, and following the discovery of the New World by Columbus, was introduced into Europe. Trade and colonization introduced it further into all parts of the world to which it could adapt. Repeated introductions, local selection and adaptation, a highly diverse gene pool and outcrossing nature, and global trade in maize led to difficulty understanding exactly where the diversity of many of the local maize landraces originated. This is particularly true in Africa and Asia, where historical accounts are scarce or contradictory. Knowledge of post-domestication movements of maize around the world would assist in germplasm conservation and plant breeding efforts. To this end, we used SSR markers to genotype multiple individuals from hundreds of representative landraces from around the world. Applying a multidisciplinary approach combining genetic, linguistic, and historical data, we reconstructed possible patterns of maize diffusion throughout the world from American "contribution" centers, which we propose reflect the origins of maize worldwide. These results shed new light on introductions of maize into Africa and Asia. By providing a first globally comprehensive genetic characterization of landraces using markers appropriate to this evolutionary time frame, we explore the post-domestication evolutionary history of maize and highlight original diversity sources that may be tapped for plant improvement in different regions of the world.
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                Author and article information

                Journal
                Environment and History
                environ hist camb
                White Horse Press
                0967-3407
                May 01 2023
                May 01 2023
                : 29
                : 2
                : 211-237
                Article
                10.3197/096734021X16076828553386
                fc36ef6a-4ad3-492d-a8ed-c5a176c6e00e
                © 2023
                History

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