Proportion of common wheat kernels in commercial samples of durum wheat by chemical methods

Durum wheat (Triticum durum Desf.) is used for production of semolina which is the required raw material for the elaboration of good quality pasta products. Common wheat (T. aestivum L,)t generally used in breadmaking, yields milling products (flour or fariña) that are not suitable for that purpose. Shortage and localization of durum wheat production, as well as its higher cost, have compelled the utilization of common wheat for the production of macaroni. When different blends of hérd or soft wheat (fariña or flour) with durum wheat are used, the quality of macaroni is reduced. Por this reason, the estimation of common wheat in pasta products is an important problem from the point of view of quality and market control, Chemical methods for detection and estimation of common wheat in pasta products have been developed in this laboratory during the past six years. The related problem of estimating the proportion of common wheat kernels in commercial samples of durum wheat has been traditionally solved either by niorphológica1 examination or by cytogenetical methods. The former are too unreliable and the latter too cumbersome, In this paper, we have reviewed the above mentioned chemical methods and investigated their application to the analysis of single kernels and the estimation of the proportion of common wheat kernels in commercial samples of durum wheat in order to avoid the cytogenetical methods or to confirm the morphological examination

2002 OUTLOOK OF THE U.S. AND WORLD WHEAT INDUSTRIES, 2001-2011

This report evaluates the U.S. and world wheat markets for the 2002-2012 period by using the Global Wheat Policy Simulation Model. This analysis is based on a series of assumptions about general economic conditions, agricultural policies, weather conditions, and technological change. Both the U.S. and world wheat economies are predicted to improve for the next ten years. World demands for both common and durum wheat are expected to grow faster than world production of the two wheat classes, resulting in gradual increases in prices of the wheat varieties, which are predicted to increase 15.3% for durum wheat and 17.3% for common wheat for the 2002-2012 period. World trade volumes of both classes of wheat are expected to expand, but trade volume of durum wheat may grow faster than common wheat.common wheat, durum wheat, production, exports, consumption, ending stocks, Crop Production/Industries,

Association Mapping for Common Bunt Resistance in Wheat

Common bunt, caused by Tilletia caries and T. foetida, is a fungal disease of wheat world wide. Infection, occurring via seed borne teliospores, is generally controlled by the application of seed treatments prior to sowing. Farming systems like organic agriculture with a very limited range of organic seed treatments available rely heavily on common bunt resistance genes within wheat. In the framework of the BIOBREED project an association study in winter wheat was conducted, aiming at the identification of genetic loci linked to resistance towards common bunt in wheat. 152 European wheat cultivars were phenotyped for their resistance reaction for the two consecutive years 2011/12 at Agrologica research station at Mariager. Infection was scored as percent infected ears. The scorings were log-transformed to fit a disease scoring scale ranging from 1 to 9. The association analysis was performed for each year separately as well as for the mean scoring of the two years. The wheat cultivars were genotyped with DArT markers, yielding 1832 polymorphic loci. The association analysis was conducted using the computer program Genstat, with the ASReml module. Minimun allele frequency for the association analysis was set to 0.07. 13 out of the total of1832 marker in our study were linked to common bunt resistance in wheat (-log10(P) >3). These marker are located on 8 out of the 21 wheat chromosomes. Comparisons of these findings with other published results are difficult since only very little is known about the chromosomal location of common bunt resistance genes/QTL in wheat. Chromosome 2B was previously reported to carry gene(s) for common bunt resistance. Findings of our analysis are in accordance with this: 4 of the linked marker resided on this chromosome. Further, another two linked marker were found on chromosome 2D, another chromosome previously reported to carry common bunt resistance genes. Our study shows the possibilities of finding makers linked to common bunt resistance in wheat, and of using these markers for marker assisted selection of wheat cultivars tailored for the needs of organic agriculture

2001 OUTLOOK OF THE U.S. AND WORLD WHEAT INDUSTRIES, 2000-2010

This report evaluates the U.S. and world wheat markets for the 2000-2010 period by using the Global Wheat Policy Simulation Model. This analysis is based on a series of assumptions about general economic conditions, agricultural policies, weather conditions, and technological change. Both the U.S. and world wheat economies are predicted to be improving for the next ten years. World demands for both common and durum wheat are expected to grow faster than world production of the two wheat classes, resulting in gradual increases in prices of the wheats, which are predicted to increase 5.3% for durum wheat and 1.1% for common wheat for the 2000-2010 period. World trade volumes of both classes of wheat are expected to expand, but trade volume of durum wheat may grow faster than common wheat.Common Wheat, Durum Wheat, Production, Exports, Consumption, Ending Stocks, Crop Production/Industries,

2009 Outlook of the U.S. and World Wheat Industries, 2008-2018

This report evaluates the U.S. and world wheat markets for the 2008-2018 period using the Global Wheat Policy Simulation Model. This analysis is based on a series of assumptions about general economic conditions, agricultural policies, weather conditions, and technological change. Both the U.S. and world wheat economies are predicted to remain relatively healthy for the next ten years. World demand for both common and durum wheat are expected to remain strong. The price levels in 2007 and 2008 will not be maintained in 2009 and future because increased wheat and corn production in 2008 and reduced demand for corn for ethanol production will lower demand and increase supply. World trade volumes of both classes of wheat are expected to expand, but trade volume of common wheat may grow faster than that of durum wheat.common wheat, durum wheat, production, exports, consumption, ending stocks, Agribusiness, Agricultural and Food Policy,

2007 Outlook of the U.S. and World Wheat Industries, 2006-2016

This report evaluates the U.S. and world wheat markets for the 2006-2016 period using the Global Wheat Policy Simulation Model. This analysis is based on a series of assumptions about general economic conditions, agricultural policies, weather conditions, and technological change. Both the U.S. and world wheat economies are predicted to improve for the next nine years. World demand for both common and durum wheat are expected to remain strong, however, the current higher price levels in 2006 due to weather conditions will not be maintained as production is expected to return to normal levels in 2007. World trade volumes of both classes of wheat are expected to expand, but trade volume of durum wheat may grow faster than that of common wheat.common wheat, durum wheat, production, exports, consumption, ending stocks, Crop Production/Industries,

Genetic resources of hulled wheat species in Czech organic farming

As organic farmers are searching for new market and sale opportunities, the organic farming system may grow and process a wider range of species than the conventional farming system. Concerning wheat especially the hulled wheat species einkorn, emmer wheat and spelt wheat are in recent years of growing interest for organic farmers. Field trials were carried out at three Czech locations from 2009 to 2010 to study the performance of 4 einkorn, 8 emmer wheat and 7 spelt wheat accessions. All trials were spring sown and bread wheat variety SW Kadrilj was used as check. The results show that some accessions of the hulled wheat species are inclined to lodging. On the other hand, they are resistant to foliar diseases, e.g. powdery mildew and leaf rust. Hulls serve as barriers against Fusarium head blight infection and therewith associated DON contamination of grains. Grain yield of hulled wheats is inferior compared to common wheat. Grains are characterised by high protein contents (up to 18.1%), however, protein quality is lower so that hulled wheats are not suitable to common baking procedures. Productivity of hulled wheat crops needs to be increased in order to extend their acreage in organic farming systems. The different technological and nutritional quality of hulled wheat species offers the possibility for new food products to be launched on the market and, hence, possibilities for regional marketing

Canola-Wheat Rotation versus Continuous Wheat for the Southern Plains

Crop rotations are not common in the wheat belt of the Southern Plains. After years of continuous wheat, weeds have become increasingly difficult and expensive to manage. Yield data were elicited from farmers and used to determine if canola-wheat-wheat rotations are economically competitive with continuous wheat in the region.crop rotation, wheat, canola, elicited yield distributions, Crop Production/Industries, Farm Management, Q10, Q12,

Common bunt resistant wheat composite cross populations

Utilising diverse populations instead of single line varieties is expected to lead to a number of advantages in cereal production. These include reduced epidemics of plant diseases, improved weed competition and better exploitation of soil nutrients, resulting in improved yield stability. However, a number of challenges must be met before diverse wheat populations can be introduced into commercial wheat production: one of these is the development of breeding technologies based on mass selection which enable breeders and farmers to improve specific traits in populations and maintain diversity at the same time. BIOBREED is a project started in Denmark in 2011 to meet these challenges for wheat population breeding. The project is focusing on the development of tools and methods for mass selection of traits relevant for organic and low input production, where it is expected that the highest benefits of utilizing diverse populations can be achieved. BIOBREED focuses on three main aspects of wheat population breeding for organic and low input production systems: i) common bunt (caused by Tilletia caries) resistance, ii) selection for improved protein content and iii) the influence on population diversity of different selection pathways. Selection for common bunt resistance in wheat composite cross populations 33 crosses were made between 23 common bunt resistant winter wheat varieties in order to generate two populations. Progeny of all crosses was bulked in the F 3 to constitute the first population Pop.No.Sel. Prior to the creation of the second population Pop.Sel, the F 3 of the parental crosses was sown as head-rows with common bunt infection. Only lines that showed resistance to common bunt were used to create Pop.Sel. in generation F 4 . Afterwards the two populations were grown with and without inoculation with common bunt in order to i) select for bunt resistance and ii) to be able to compare the effect on diversity of this selection step. Preliminary results show a higher level of common bunt resistance in Pop.Sel in the first year. Single seed sorting for protein content Prior to sowing the F 5 seed of the population Pop.Sel, the seed were sorted individually for protein content using a BoMill IQ Grain Quality Sorter 1002S. The fraction of seeds containing the 10% highest and another fraction containing the 10% lowest protein content were selected. The four populations, Pop.No.Sel, Pop.Sel, and Pop.Sel.high. Protein and Pop.Sel.low.Protein and the parental lines were sown in a randomized complete block yield trial at two locations in Denmark in order to assess their yield and quality parameters such as protein content and baking quality of the parents and there derived populations. Results are expected in the summer 2013. Diversity of wheat composite cross populations. The practical question of “how much diversity is needed in populations?” has not been answered yet. BIOBREED will aim to to quantify the levels of diversity in wheat composite cross populations after the different selection steps i) cultivation with and without common bunt inoculum, and ii) sorting for single protein content. In a fist attempt SSR markers will be used to describe the influence these different selection pathways will have on the population diversity. 90 SSR markers—about two markers per chromosome arm—will be used to describe the initial genetic diversity of the 23 parental lines. F 6 seed of the different populations will be analysed with the same markers and population diversity after different selection pathways will be quantified

2005 OUTLOOK OF THE U.S. AND WORLD WHEAT INDUSTRIES, 2004-2013

This report evaluates the U.S. and world wheat markets for the 2004-2013 period using the Global Wheat Policy Simulation Model. This analysis is based on a series of assumptions about general economic conditions, agricultural policies, weather conditions, and technological change. Both the U.S. and world wheat economies are predicted to improve for the next nine years. World demand for both common and durum wheat are expected to grow faster than world production, resulting in gradual increases in prices of the wheat varieties. However, the higher price levels experienced in 2002 and 2003 due to weather conditions will not be maintained in the short term. World trade volumes of both classes of wheat are expected to expand, but trade volume of durum wheat may grow faster than that of common wheat.common wheat, durum wheat, production, exports, consumption, ending stocks, Crop Production/Industries,