Download or read book Resistance of Roses to Diplocarpon Rosae the Cause of Blackspot written by Cleone Hansen Geddes and published by . This book was released on 1952 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Resistance of Roses to Diplocarpon Rosae written by Cleone Lyle Hansen Geddes and published by . This book was released on 1948 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies of the life cycle of Diplocarpon rosae Wolf on roses and the effectiveness of fungicides on pathogenesis written by and published by Cuvillier Verlag. This book was released on 2005-06-13 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Der Sternrußtau (Schwarzfleckigkeit), Hauptfruchtform Diplocarpon rosae Wolf, (Nebenfruchtform Marssonina rosae), ist eine häufige und weit verbreitete Krankheit an Freilandrosen. Bisher war weder die Entwicklung des Pilzes im Blattgewebe geklärt, noch waren in der Literatur fotografische Aufnahmen zur endophytischen Pilzentwicklung zu finden. Die Bekämpfung des Pilzes wird überwiegend mit Fungiziden durchgeführt. Die Untersuchungen vorliegender Arbeit umfassen sowohl mikroskopische Studien zur exakten Ausbreitung des Erregers im Rosenblatt als auch die Wirkung unterschiedlicher Fungizide, insbesondere Strobilurine und Azole, auf pilzliche Strukturen. Zunächst wurde die Aggressivität verschiedener Isolate aus Kenia und Deutschland getestet. An einem deutschen Isolat konnte der Entwicklungszyklus von D. rosae mit verschiedenen Färbetechniken lichtmikroskopisch sowie nach konventioneller Präparation elektronenmikroskopisch studiert werden: Nach der Konidienkeimung entsteht eine Keimhyphe, von der aus meist ein Appressorium gebildet wird. Auf der Wirtskutikula zeigt sich dann an der Stelle der späteren Penetration ein brauner Ring, der vermutlich melanisiert ist. Nach der Penetration bildet sich in der subkutikulären Region ein Infektionsvesikel. Primäre Hyphen durchdringen von diesem Infektionsvesikel ausgehend subkutikuläre und interzelluläre Wirtsgewebezonen. Subkutikuläre, interzelluläre und intramurale Hyphen bilden in den epidermalen Zellen Haustorien unterschiedlicher Formen. Interzelluläre Hyphen produzieren ebenfalls Haustorien im Palisadenparenchym. Intrazelluläre Hyphen entstehen erst kurz vor der Bildung der Reproduktionsorgane. Braune, stark ornamentierte Strukturen werden vom Pilz auf den überwinternden Blättern gebildet. Diese öffnen sich im Frühjahr des Folgejahres und entlassen dünnwandige Organe. In diesen subepidermalen Apothezien-ähnlichen Strukturen entstehen aber keine Ascosporen. Strobilurine hemmten die Konidienkeimung vollständig, während Azole einen weniger starken Einfluss auf die Keimung hatten. Dagegen zerstörten die Azole alle Pilzstrukturen im Inneren des Gewebes, auch wenn sie sich bereits gut etabliert hatten. Diese Reaktion konnte bei Einsatz der Strobilurine nicht so deutlich beobachtet werden. Alle Fungizidtests zur protektiven und kurativen Wirkung wurden mit jeweils 100 ppm reinem Wirkstoff durchgeführt. Die Untersuchungen zeigten, dass D. rosae eine hemibiotrophe Lebensweise besitzt: die biotrophe Phase besteht aus der Haustorienbildung und die nekrotrophe Phase aus der Bildung interzellulärer Hyphen. Die deutschen Witterungsbedingungen eignen sich offenbar nicht für eine subepidermale Apothezienbildung. Strobilurine zeigten nur nach protektiver Applikation eine Wirkung. Azole wirkten sowohl bei prä- als auch bei post-inokulativer Behandlung.

Download or read book Studies of the life cycle of Diplocarpon rosae Wolf on roses and the effectiveness of fungicides on pathogenesis written by Emma Wanjiru Gachomo and published by Cuvillier Verlag. This book was released on 2005 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Resistance Breeding for Powdery Mildew Podosphaera Pannosa and Black Spot Diplocarpon Rosae in Roses written by Leen Leus and published by . This book was released on 2005 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Plant Breeding Reviews written by Jules Janick and published by John Wiley & Sons. This book was released on 2011-04-22 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plant Breeding Reviews presents state-of-the-art reviews on plant breeding and genetics covering horticultural, agronomic and forestry crops, incorporating both traditional and molecular methods. The contributions are authored by world authorities, anonymously reviewed, and edited by Professor Jules Janick of Purdue University, USA. The series is an indispensible resource for crop breeders, plant scientists, and teachers involved in crop improvement and genetic resources. Initiated in 1983, Plant Breeding Reviews is published in the form of one or two volumes per year. Recently published articles include: Epigenetics and Plant Breeding (v30) Enhancing Crop Gene Pools with Beneficial Traits Using Wild Relatives (v30) Coffee Germplasm Resources, Genomics and Breeding (v30) Molecular Genetics and Breeding for Fatty Acid Manipulation in Soybean (v30) Breeding Southern Highbush Blueberries (v30) Development of Fire Blight Resistance by Recombinant DNA Technology (v29)

Download or read book Applications of Tissue Culture to the Breeding of Roses with Resistance to Diplocarpon Rosae written by Viswambharan Sarasan and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effects of Environment and of Selected Chemicals Upon the Development of Black Spot of Rose and of the Pathogen Diplocarpon Rosae Wolf written by J. Stanley Melching and published by . This book was released on 1966 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Encyclopedia of Rose Science written by Thomas Debener and published by Academic Press. This book was released on 2003-10-27 with total page 4142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Encyclopedia of Rose Science brings together a wealth of information on the rose, long treasured for its captivating perfumes and splendid colors. Now, more than ever, science plays a central place in the production of this flower at the center of one of the world's biggest floricultural industries. A team of internationally renowned experts has contributed scores of articles, from the history of rose cultivation to discoveries in rose genetics. For researchers and students, as well as commercial rose growers and breeders, the Encyclopedia of Rose Science is an invaluable reference. The Encyclopedia of Rose Science is available online on ScienceDirect. The print edition price for this reference work does not include online access. For more information on pricing for access to the online edition, please review our Licensing Options. The richness and authority of Elsevier reference works is now lent valuable functionality and accessibility through the online launch of Elsevier Reference Works on ScienceDirect. Features: Extensive browsing and searching across subject, thematic, alphabetical, author and cited author indexes - as applicable to the work Basic and advanced search functionality within volumes, parts of volumes, or across the whole work Ability to build, save and re-run searches as well as combine saved searches Internal cross-referencing between articles in the work, plus dynamic linking to journal articles and abstract databases, making navigation flexible and easy All articles are available as full-text HTML files, and as PDF files that can be viewed, downloaded or printed out in their original print format A dedicated Reference Works navigation tab and homepage on ScienceDirect to enable easy linking from your OPAC or library website For more information about the Elsevier Reference Works on ScienceDirect Program, please visit: http://www.info.sciencedirect.com/reference_works. Presents complete, up-to-date information on over 35 subject areas of major importance to rose scientists Encyclopedic format provides for concise, readable entires, easy searches, and extensive cross-references Incorporates MODERN ROSES XI, published by the American Rose Society as International Cultivar Registration Authority for Roses, the most comprehensive list of roses of historical and botanical importance! High quality full-color production, with many figures and tables

Download or read book Mapping Black Spot Disease Resistance and Cold Hardiness in Garden Roses Rosa X Hybrida written by Cindy Rouet and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis aims to contribute to the modernization of Canada's national rose breeding program by developing molecular markers associated with traits of major interest. Roses are one of the most economically important ornamental crops. Consumers' preferences are continuously evolving, meaning that the rose industry needs to release new varieties at a fast pace to remain competitive. As a consensus, consumers want low maintenance roses. To meet consumers' demand, Canada's national rose breeding program, which is hosted in the Niagara Region, focuses on breeding for black spot disease resistance and winter hardiness. In this regard, Canadian Explorer roses are known worldwide for their exceptional hardiness. The objective of this thesis was to identify quantitative trait loci (QTL) associated with resistance to black spot disease (Diplocarpon rosae) and winter hardiness in polyploid bi-parental populations derived from Explorer roses, and to set up a framework for the development of molecular markers and the implementation of marker-assisted selection. Molecular tools not only have the potential to improve the accuracy and speed of the selection process, but they also promise to reduce the cost and the labor associated with recording complex phenotypic traits. This research identified a major QTL associated with the resistance to several races of Diplocarpon rosae under natural and artificial conditions on linkage group 1 of the rose genome for which a diagnostic marker was designed and validated in the genetic background of the parental donor. Furthermore, this research identified several QTLs associated with winter damage, spring regrowth and freezing tolerance measured by electrolyte leakage in artificial conditions. While no diagnostic markers were developed, this research highlighted the limited utility of electrolyte leakage as a proxy for field winter hardiness and the complexity of this phenotypic trait. Together, these results demonstrate the potential for implementing marker-assisted selection for black spot disease resistance in a rose breeding program, and provide a starting point for the molecular characterization of the genetic and molecular basis of winter hardiness in roses.

Download or read book Breeding for Disease Resistance written by R. Johnson and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: There is an increasing need for an understanding of the fundamental processes involved in the mechanisms by which disease resistances are introduced into crop plants. This book provides a wide-ranging coverage of the successes and failures of the classical techniques; it describes the advances towards modern technology and addresses the problems of pathogen variation. Crop plants that are considered include: cereals (wheat, barley, rice), potatoes, vegetables and soft fruits.

Download or read book Genetics and Genomics of Rosaceae written by Kevin M. Folta and published by Springer Science & Business Media. This book was released on 2009-05-28 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book on Rosaceae genomics. It covers progress in recent genomic research among the Rosaceae, grounding this firmly in the historical context of genetic studies and in the application of genomics technologies for crop development.

Download or read book Flower Breeding and Genetics written by Neil O. Anderson and published by Springer Science & Business Media. This book was released on 2007-10-04 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt: Floriculture is one of the fastest-growing sectors of commercial agriculture. This book provides a unique and valuable resource on the many issues and challenges facing flower breeders, as well as the industry at-large. Featuring contributions from 32 international authorities, it offers tools and directions for future crop domestication and enhancement as well as offers essential information for breeding a wide range of floriculture crops.

Download or read book The Lichens written by Vernon Ahmadijian and published by Elsevier. This book was released on 2012-12-02 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lichens covers the structure and development, physiology of the intact thallus, environmental response and effects, secondary metabolic products, and symbiont interactions of lichens. This book is divided into five parts encompassing 19 chapters. It also includes appendices consist of a taxonomic scheme, methods for isolating and culturing lichen symbionts and thalli, and methods for isolating and identifying lichen substances. The first part of this book describes the original fungal cell and its development into specialized cells of which the various tissues and thalli are composed. This is followed by discussions on sexual reproduction of ascolichens and basidiolichens and on systematic criteria for the definition of taxa in different hierarchical steps. This book also explains the types of propagules produced by lichens and the submicroscopical investigations of lichens, including phycobiont and mycobionts' substructure and symbiotic relationship. The second part of this book examines the physiological aspects of lichens. It includes discussions on metal cation uptake and translocation in vascular plants and on lichens' role in rock weathering and soil formation. This part also studies photosynthetic rates and nitrogen absorption and metabolism by the intact thallus of lichens. Succeeding chapters discuss physiological and morphological responses of lichens to the most important environmental factors and the relationship of these factors to lichen distribution. Substrate preferences of lichens and their causes and implications with regard to the ecology, distribution, and taxonomy of lichens are also examined. This text also discusses lichen thalli growth, methods of measurement, and factors influencing growth. Finally, the concluding parts deal with the biosynthesis of lichen substances, secondary metabolic products, and symbiotic relations of lichens to fungi and algae. This multi-authored book is an ideal source of information for researchers, teachers, and students who wish to broaden their knowledge in the diversity of lichenology.

Download or read book Studies on the Blackspot Disease of Roses Caused by Diplocarpon Rosae written by Peter John William Saunders and published by . This book was released on 1965 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Roses for English Gardens written by Gertrude Jekyll and published by . This book was released on 1902 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Black spot Disease of Roses and Its Control Under Greenhouse Conditions written by Eldon Wood Lyle and published by . This book was released on 1937 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: