With the continuous struggle between crops and the diseases which exploit them, achieving durable disease resistance remains a challenge. The sector must influence developments in key areas to be able to achieve this goal for some of the major diseases that affect cereal crops. Achieving durable disease resistance in cereals provides an authoritative review of these developments, from advances in understanding pathogen biology/epidemiology and plant pathogen interactions, to identifying sources of resistance and advances in techniques for breeding new varieties. This collection offers a comprehensive discussion on the major diseases that affect cereal crops, including, but not limited to, leaf rust, Fusarium head blight, Septoria tritici blotch, tan spot and powdery mildew. Edited by Professor Richard Oliver, Curtin University, Australia, Achieving durable disease resistance in cereals will be a excellent reference framework for researchers in cereal science, arable farmers, government and private sector agencies supporting cereal production and companies supplying the cereals sector (e.g. seed companies; fertiliser and pesticide manufacturers.
Human population is escalating at an enormous pace and is estimated to reach 9.7 billion by 2050. As a result, there will be an increase in demand for agricultural production by 60–110% between the years 2005 and 2050 at the global level; the number will be even more drastic in the developing world. Pathogens, animals, and weeds are altogether responsible for between 20 to 40 % of global agricultural productivity decrease. As such, managing disease development in plants continues to be a major strategy to ensure adequate food supply for the world. Accordingly, both the public and private sectors are moving to harness the tools and paradigms that promise resistance against pests and diseases. While the next generation of disease resistance research is progressing, maximum disease resistance traits are expected to be polygenic in nature and controlled by selective genes positioned at putative quantitative trait loci (QTLs). It has also been realized that sources of resistance are generally found in wild relatives or cultivars of lesser agronomic significance. However, introgression of disease resistance traits into commercial crop varieties typically involves many generations of backcrossing to transmit a promising genotype. Molecular marker-assisted breeding (MAB) has been found to facilitate the pre-selection of traits even prior to their expression. To date, researchers have utilized disease resistance genes (R-genes) in different crops including cereals, pulses, and oilseeds and other economically important plants, to improve productivity. Interestingly, comparison of different R genes that empower plants to resist an array of pathogens has led to the realization that the proteins encoded by these genes have numerous features in common. The above observation therefore suggests that plants may have co-evolved signal transduction pathways to adopt resistance against a wide range of divergent pathogens. A better understanding of the molecular mechanisms necessary for pathogen identification and a thorough dissection of the cellular responses to biotic stresses will certainly open new vistas for sustainable crop disease management. This book summarizes the recent advances in molecular and genetic techniques that have been successfully applied to impart disease resistance for plants and crops. It integrates the contributions from plant scientists targeting disease resistance mechanisms using molecular, genetic, and genomic approaches. This collection therefore serves as a reference source for scientists, academicians and post graduate students interested in or are actively engaged in dissecting disease resistance in plants using advanced genetic tools.
Breeding cereals in Northwest Europe for durable resistance has made an important contribution to control of almost all economically significant diseases and pests of wheat, barley and oats. Durable resistance to fungal diseases is largely polygenic and quantitative, with the important exception of mlo resistance to powdery mildew of spring barley. Resistance to powdery mildew of winter wheat, spring barley and spring oats, brown rust of winter barley and Septoria nodorum blotch of wheat has been especially effective and durable. Resistance to Barley yellow mosaic virus and orange wheat blossom midge has used single genes which have so far been durable. Plant breeders are increasingly producing varieties with high or moderate resistance to all the most important diseases, and have successfully combined durable resistance with other traits which are important to farmers and end-users, including high yield, marketable grain quality and desirable agronomic properties.
The small grain cereals wheat, barley, oats and rye are cultivated worldwide and form the foundation of most agricultural systems. Reflecting the global importance of cereal crops, the Color Handbook helps to identify quickly and accurately the diseases that afflict them. Covering some 50 of the most important pathogens, the handbook provides clear, concise descriptions of the symptoms and cycles of diseases, their distribution and economic importance, and advice on their control. The text is illustrated by over 230 superb color photographs of crops affected - in the field and under the microscope. The handbook is intended as a lasting source of reference for professionals in crop protection and plant pathology, growers, farmers and students of agriculture.
This collection features four peer-reviewed reviews of septoria tritici blotch in cereals. The first chapter reviews the various methods for managing septoria tritici blotch (STB), from the the use of fungicides to marker-assisted breeding for increased resistance to STB. It also surveys research on the molecular basis of host-pathogen interactions in STB. The second chapter reviews current research on the main fungal diseases affecting barley, focussing on biotrophic foliar diseases, such as stem rust and powdery mildew, as well as necrotrophic diseases, such as septoria tritici blotch and fusarium head blight. The chapter also discusses the implications for achieving sustainable resistance to the pathogens responsible for these diseases. The third chapter addresses advances in understanding the epidemiology of septoria tritici blotch in the major cereal crops. The chapter also reviews the taxonomy and life cycle of Zymoseptoria tritici - the cause of septoria tritici blotch, as well as the economic impact of the pathogen. The final chapter reviews recent research on genetic resistance loci and breeding strategies based on both conventional and biotechnology-based breeding approaches to achieve durable resistance to septoria tritici blotch infection, whilst simultaneously minimising the risk of grain yield losses. What is an Instant Insight? An Instant Insight gives you immediate access to key research on a topic, allowing you to get right to the heart of a subject in an instant and empowering you to contribute to sustainable agriculture.
Drought remains the biggest single threat from climate change to the production of key cereal crops, such as wheat and barley. Cereals also respond in complex ways to drought stress, making improved drought tolerance a challenging trait to achieve. With many cereals recognised as staple food crops due to their nutritional value, more research is required into improving drought tolerance as a means of ensuring the future food security of millions. Developing drought-resistant cereals reviews the wealth of research which addresses how to overcome this challenge in order to mitigate climate change effects in cereal production. This collection details our understanding of the mechanisms of drought tolerance, as well as the development of techniques for improving resistance, including phenotyping, genome-wide association studies (GWAS) and genome editing.
From February 24 -28, 1992 an international symposium on Durability of Disease Resistance was held at the International Agricultural Centre in Wageningen, the Netherlands. The symposium, organized by the Department of Plant Breeding of Wageningen Agricultural University and the Centre for Plant Breeding and Repro duction Research, CPRO-DLO, was part of the DGIS funded programme Durable Resistance in Developing Countries. Without any form of prevention or protection nearly all crops will be seriously or even severely damaged by a range of pathogens. In modern agriculture man has been able to control many if not most pathogens using i) pesticides, ii) phyto sanitary methods such as control of seed and plant material in order to start a crop disease free, iii) agronomic measures such as crop rotation, iv) disease resis tance or combinations of these measures. Over the years the use of pesticides has increased enormously and so did the pro blems associated with pesticide use, such as environmental pollution and building of resistance and tolerance to these pesticides in the pathogens. The use of resis tance too increased strongly over the years and here too problems arose.
