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Maize (Zea mays L.) breeders are concerned about the narrowing of the genetic base of elite germplasm. To reverse this trend, elite germplasm from other geographic regions can be introgressed, but due to lack of adaptation it is difficult to assess their breeding potential in the targeted environment. The objectives of this study were to (1) investigate the relationship between European and US maize germplasm, (2) examine the suitability of different mega-environments and measures of performance to assess the breeding potential of exotics, and (3) study the relationship of genetic distance with mid-parent heterosis (MPH). Eight European inbreds from the Dent and Flint heterotic groups, 11 US inbreds belonging to Stiff Stalk (SS), non-Stiff Stalk (NSS), and CIMMYT Pool 41, and their 88 factorial crosses in F(1) and F(2) generations were evaluated for grain yield and dry matter concentration. The experiments were conducted in three mega-environments: Central Europe (target mega-environment), US Cornbelt (mega-environment where donor lines were developed), and Southeast Europe (an intermediate mega-environment). The inbreds were also fingerprinted with 266 SSR markers. Suitable criteria to identify promising exotic germplasm were F(1) hybrid performance in the targeted mega-environment and F(1) and parental performance in the intermediate mega-environment. Marker-based genetic distances reflected relatedness among the inbreds, but showed no association with MPH. Based on genetic distance, MPH, and F(1) performance, we suggest to introgress SS germplasm into European Dents and NSS into European Flints, in order to exploit the specific adaptation of European flint germplasm and the excellent combining ability of US germplasm in European maize breeding programs.
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http://dx.doi.org/10.1007/s00122-009-1055-9 | DOI Listing |
Nat Hum Behav
December 2024
Department of Archaeology, University of Cambridge, Cambridge, UK.
Over the past decade, multidisciplinary research has seen the Amazon Basin go from a context perceived as unfavourable for food production and large-scale human societies to one of 'garden cities', domestication, and anthropogenically influenced forests and soils. Nevertheless, direct insights into human interactions with particular crops and especially animals remain scarce across this vast area. Here we present new stable carbon and nitrogen isotope data from 86 human and 68 animal remains dating between CE ~700 and 1400 from the Llanos de Mojos, Bolivia.
View Article and Find Full Text PDFPlant Physiol
December 2024
Plant Breeding, TUM School of Life Sciences, Technical University of Munich, 85354 Freising, Germany.
The sustainability of maize cultivation would benefit tremendously from early sowing, but is hampered by low temperatures during early development in temperate climates. We show that allelic variation within the gene encoding subunit M of the NADH-dehydrogenase-like (NDH) complex (ndhm1) in a European maize landrace affects several quantitative traits that are relevant during early development in cold climates through NDH-mediated cyclic electron transport (CET) around photosystem I, a process crucial for photosynthesis and photoprotection. Beginning with a genome-wide association study for maximum potential quantum yield of photosystem II in dark-adapted leaves (Fv/Fm), we capitalized on the large phenotypic effects of a hAT transposon insertion in ndhm1 on multiple quantitative traits (early plant height, Fv/Fm, chlorophyll content, and cold tolerance) caused by the reduced protein levels of NDHM and associated NDH components.
View Article and Find Full Text PDFInt J Biol Macromol
December 2024
Key Lab. Eco-functional Polymer Materials of MOE, Institute of Polymer, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
To address the problems of ecological pollution and food safety caused by the excessive use of chemical fertilizers in modern agriculture, it has become a hot topic of current research to develop novel low-cost, biodegradable, and efficient gel slow-release fertilizers. Herein, using xanthan gum and ZrMOF as raw materials, urea as a nutrient, acrylic acid and itaconic acid as co-monomers, a novel ZrMOF gel slow-release fertilizer (ZrMOF@CpM) was prepared by free radical copolymerization. After being characterized, its swelling and water retention properties and slow-release behavior were investigated.
View Article and Find Full Text PDFConserv Physiol
December 2024
Université de Strasbourg, Centre National de la Recherche Scientifique, Institut Pluridisciplinaire Hubert Curien, Unité Mixte de Recherche 7178, 23 rue du Loess, 67200 Strasbourg, France.
Modern production-oriented farming has led to a decline in agricultural biodiversity. In Europe, one example of concern is the common hamster , a hibernating rodent once largely distributed in farmlands and now listed as Critically Endangered. The decline of this species is tied to a significant decrease in hamsters' body mass at emergence from hibernation and in reproduction rate.
View Article and Find Full Text PDFFront Plant Sci
November 2024
Institute for Sustainable Agriculture (IAS), Consejo Superior de Investigaciones Científicas (CSIC), Córdoba, Spain.
High-throughput phenotyping (HTP) provides new opportunities for efficiently dissecting the genetic basis of drought-adaptive traits, which is essential in current wheat breeding programs. The combined use of HTP and genome-wide association (GWAS) approaches has been useful in the assessment of complex traits such as yield, under field stress conditions including heat and drought. The aim of this study was to identify molecular markers associated with yield (YLD) in elite durum wheat that could be explained using hyperspectral indices (HSIs) under drought field conditions in Mediterranean environments in Southern Spain.
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