Person: Pietragalla, J.
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Pietragalla
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Pietragalla, J.
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- The Ontologies Community of Practice: a CGIAR initiative for big data in agrifood systems(Cell Press, 2020) Arnaud, E.; Laporte, M.A.; Soonho Kim; Aubert, C.; Leonelli, S.; Miro, B.; Cooper, L.; Jaiswal, P.; Kruseman, G.; Shrestha, R.; Buttigieg, P.L.; Mungall, C.; Pietragalla, J.; Agbona, A.; Muliro, J.; Detras, J.; Hualla, V.; Abhishek Rathore; Das, R.R.; Dieng, I.; Bauchet, G.J.; Menda, N.; Pommier, C.; Shaw, F.; Lyon, D.A.; Mwanzia, L.; Juarez, H.; Bonaiuti, E.; Chiputwa, B.; Obileye, O.; Auzoux, S.; Dzale Yeumo, E.; Mueller, L.A.; Silverstein, K.; Lafargue, A.; Antezana, E.; Devare, M.; King, B.
Publication - Analysis and interpretation of interactions in agricultural research(American Society of Agronomy, 2015) Vargas Hernández, M.; Glaz, B.; Alvarado Beltrán, G.; Pietragalla, J.; Morgounov, A.; Zelenskiy, Y.; Crossa, J.When reporting on well-conducted research, a characteristic of a complete and proper manuscript is one that includes analyses and interpretations of all interactions. Our purpose is to show how to analyze and interpret interactions in agronomy and breeding research by means of three data sets comprising random and fixed effects. Experiment 1 tested wheat (Triticum aestivum L.) at two N and four P fertilizer rates in two soil types. For this data set, we used a fixed-effect linear model with the highest order (three-way) interaction considered first and then worked down through the lower order interactions and main effects to illustrate the importance of interactions in data analysis. Experiment 2 evaluated maize (Zea mays L.) hybrids under four rates of N for 3 yr. For this data set, we used a linear mixed model and partitioned the four N rates into orthogonal polynomials. Experiment 3 evaluated genotypes in six environments where the objective was to show how to study genotype × environment interactions. Researchers must analyze all interactions, determine if they are due to changes in rank (crossover) or only to changes in scale, and then judge whether reporting on significant main effects or interactions would best explain the biological responses in their experiments. In an experiment with more than one factor, complete and correct analysis of interactions is essential for reporting and interpreting the research properly.
Publication - Genetic dissection of grain size and grain number trade-offs in CIMMYT Wheat Germplasm(Public Library of Science, 2015) Griffiths, S.; Wingen, L.U.; Pietragalla, J.; García, G.; Hasan, A.K.; Miralles, D.; Calderini, D.; Jignaben Bipinchandra Ankleshwaria; Leverington Waite, M.; Simmonds, J.; Snape, J.; Reynolds, M.P.Grain weight (GW) and number per unit area of land (GN) are the primary components of grain yield in wheat. In segregating populations both yield components often show a negative correlation among themselves. Here we use a recombinant doubled haploid population of 105 individuals developed from the CIMMYT varieties Weebill and Bacanora to understand the relative contribution of these components to grain yield and their interaction with each other. Weebill was chosen for its high GW and Bacanora for high GN. The population was phenotyped in Mexico, Argentina, Chile and the UK. Two loci influencing grain yield were indicated on 1B and 7B after QTL analysis. Weebill contributed the increasing alleles. The 1B effect, which is probably caused by to the 1BL.1RS rye introgression in Bacanora, was a result of increased GN, whereas, the 7B QTL controls GW. We concluded that increased in GW from Weebill 7B allele is not accompanied by a significant reduction in grain number. The extent of the GW and GN trade-off is reduced. This makes this locus an attractive target for marker assisted selection to develop high yielding bold grain varieties like Weebill. AMMI analysis was used to show that the 7B Weebill allele appears to contribute to yield stability.
Publication - Fitomejoramiento fisiológico II: una guía de campo para la caracterización fenotípica de trigo(CIMMYT, 2013) Pask, A.; Pietragalla, J.; Mullan, D.M.; Chavez-Dulanto, P.N.; Reynolds, M.P.Este manual describe el uso de diversas técnicas para la caracterización fenotípica en la investigación agrícola aplicada, con énfasis en métodos comúnmente usados en el Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT). El manual proporciona una guía sobre medidas exactas y confiables de rasgos fisiológicos a través del ciclo del cultivo, siguiendo de este modo la teoría presentada en el Volumen 1 de Fitomejoramiento Fisiológico (Enfoques interdisciplinarios para mejorar la adaptación del cultivo).
Publication - Physiological breeding II: a field guide to wheat phenotyping(CIMMYT, 2012) Pask, A.; Pietragalla, J.; Mullan, D.M.; Reynolds, M.P.This manual describes the use of diverse phenotyping techniques for applied crop research, with an emphasis on the methods commonly used at the Internati onal Maize and Wheat Improvement Center (CIMMYT). The manual provides guidance on the accurate and reliable measurement of physiological traits throughout the wheat crop cycle, and follows on from the theory outlined in Volume 1 of Physiological Breeding (Interdisciplinary Approaches to Improve Crop Adaptati on).
Publication - International Wheat Improvement: Highlights from an Expert Symposium(CIMMYT, 2008) Reynolds, M.P.; Hobbs, P.R.; Ortiz, R.; Pietragalla, J.; Braun, H.J.Wheat is grown on 217 million hectares worldwide, accounting for some 620 million tons of grain and providing one-fifth of the world’s total calorific input. In regions like North Africa, Turkey, and Central Asia, wheat provides fully half of total dietary calories. Half the world’s wheat area is found in developing countries, where steady increases in productivity since the Green Revolution, associated with improved yields, resistance to diseases, adaptation to abiotic stresses, and better agronomic practices, are now under serous threat. Challenges include increased demand, scarcity of water resources, unpredictable climates, increased urbanization and loss of quality farmland, and decreased public investments in agriculture. To meet the rising demand for wheat in a sustainable way, farmers need a new generation of improved cultivars, along with resource-conserving practices to grow them. In March 2006, with support from the Australian Centre for International Agricultural Research (ACIAR), CIMMYT brought together 160 scientists from over 30 wheatproducing countries to discuss how to increase wheat production sustainably. Their presentations and discussions are being assembled in the proceedings International Symposium on Wheat Yield Potential: Challenges to International Wheat Breeding, to be published by CIMMYT in March 2008. The volume will include articles from the symposium already published in 2007 in special issues of Euphytica (volume 157:3) and the Journal of Agricultural Science (volume 145:1-3), as well as other papers from the meetings: Reports of the workshop “Stakeholder priorities for internationally-coordinated wheat research” involving representatives of major wheat producing countries on all continents whose remit was to develop a list of priorities for future wheat research that could best be tackled in a globally-coordinated fashion, and outlines of activities that would serve as templates for future project development for selected priorities. The summary of field day presentations by groups of collaborating scientists in attendance, illustrating the continuum between national, regional, and internationalcenter-based research activities. Reports of a pre-symposium survey soliciting statistics on wheat production and constraints to productivity and research from 19 countries in Latin America, sub-Saharan Africa; Central and West Asia and North Africa; and South and Southeast Asia. Collectively these countries account for over 100 million hectares of wheat and around 90% of the wheat production in the developing world. The data were also used to prepare a general summary of the constraints to productivity and research across the above-mentioned regions.
Publication - International Symposium on Wheat Yield Potential: Challenges to International Wheat Breeding(CIMMYT, 2008) Reynolds, M.P.; Pietragalla, J.; Braun, H.J.Like many other patterns, investment in research is often cyclical. International centers like CIMMYT have focused substantial resources on biotic and abiotic stresses for about two decades now, but raising total productivity is also back on the development agenda. There are a number of reasons for this, among them sharp rises in the price of staple foods as well as the manifestation of detrimental effects of climate change on productivity. Those factors threaten not only the livelihoods of resource-poor people but food security at a broader level, as highlighted by the World Bank’s recent World Development Report. CIMMYT has an unsurpassed record when it comes to raising crop yields from the days of the Green Revolution; as can be seen from the comprehensive scope of this new publication, our Global Wheat Program is back in the game. The book consists of proceedings of a week-long consultation of experts and leaders held in 2006 and representing all major wheat producing countries worldwide. It encompasses their ideas on how, through internationally coordinated collaborative research, proven technologies of the past can be married with new tools and approaches to meet demand for the world’s number one staple crop: wheat.
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