Download or read book Genetic Network Regulating Variation in Vegetative Phase Change in Maize written by Wei Zhang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Vegetative phase change in maize is characterized by the transition from waxy juvenile leaves to pubescent, glossy adult leaves. In maize, mutants that alter the timing of vegetative phase change are valuable resources to identify the responsible factors. Also, continuous variation of leaf identity traits in diverse genetic mapping populations indicates the feasibility to use quantitative trait locus (QTL) analyses to find underlying genes. I demonstrate here that Glossy15 (Gl15) is the most important gene controlling leaf identity traits in maize. Decreased level of Gl15 mRNA in various gl15 mutant alleles promoted the transition from juvenile to adult leaf identity in all genetic backgrounds tested. Additionally, the Gl15 gene appears as the most significant QTL for leaf identity traits in multiple genetic mapping populations, where variation in both its DNA sequence and mRNA expression could explain phenotypic differences among population of diverse maize inbred lines. Building on studies of the genetic network controlling vegetative phase change in the model plant species Arabidopsis, microRNA156 (miR156) and its target the SQUAMOSA PROMOTER BINDIND LIKE PROTEIN (SPL) genes also control leaf identity traits in maize. The miR156g and SBP5 genes are found within other large-effect QTLs that controlling leaf identity traits, and the relative expression levels of these genes correlates with the timing of vegetative phase change. The unique and easily visible leaf identity traits in maize offer advantages to characterizing the effects of many other regulators as well. I found that the activities of GAs, an upstream component of the genetic network regulating vegetative phase change, promote adult leaf identity by influencing the antagonistic interactions of miR156 and miR172; whereas Gl15 conditions changes in epicuticular wax composition between juvenile and adult leaves by activating aldehyde reductase and suppressing aldehyde decarbonylase.
Download or read book Dynamics of Gene Expression During Vegetative Phase Change in Maize written by Benjamin DuPree Beydler and published by . This book was released on 2014 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: As maize plants undergo vegetative phase change, they both exhibit heteroblasty, an abrupt change in pattern of leaf morphogenesis, and gain the ability to produce flowers. Both processes are under the control of microRNA 156, whose levels decline at the end of the juvenile phase. Gain of ability to flower is conferred by expression of miR156 targets that encode Squamosa Promoter-Binding (SBP) transcription factors, which in turn induce the expression of MADS-box transcription factors that promote maturation and flowering. What gene expression differences underlie heteroblasty, as well as what causes the reduction in miR156 levels, remain open questions. Here, we compare the gene expression in primordia that will develop into juvenile or adult leaves to identify genes that define these two developmental states and may influence vegetative phase change. In comparisons among successive leaves at the same developmental stage of plastochron 6, three-fourths of approximately 1,100 differentially expressed genes were more highly expressed in juvenile primordia. This juvenile set was enriched in photosynthetic genes, particularly those associated with cyclic electron flow at photosystem I, and genes involved in oxidative stress and retrograde redox signaling. Pathogen responsive pathways including jasmonic acid, salicylic acid, and benzoxazinoids were also up-regulated in juvenile primordia and indeed, we found that exogenous application of jasmonic acid, and hydrogen peroxide delays vegetative phase change in maize seedlings. These results suggest that the timing of vegetative phase change in maize is coordinated in part downstream of photo-oxidative stress signaling. Photo-oxidative stress during greening likely amplifies heterotrophic energy insufficiency. The successful amelioration of these stress signals may ultimately determine the duration of miR156-mediated juvenility.
Download or read book Ecological Genomics written by Christian R. Landry and published by Springer Science & Business Media. This book was released on 2013-11-25 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Researchers in the field of ecological genomics aim to determine how a genome or a population of genomes interacts with its environment across ecological and evolutionary timescales. Ecological genomics is trans-disciplinary by nature. Ecologists have turned to genomics to be able to elucidate the mechanistic bases of the biodiversity their research tries to understand. Genomicists have turned to ecology in order to better explain the functional cellular and molecular variation they observed in their model organisms. We provide an advanced-level book that covers this recent research and proposes future development for this field. A synthesis of the field of ecological genomics emerges from this volume. Ecological Genomics covers a wide array of organisms (microbes, plants and animals) in order to be able to identify central concepts that motivate and derive from recent investigations in different branches of the tree of life. Ecological Genomics covers 3 fields of research that have most benefited from the recent technological and conceptual developments in the field of ecological genomics: the study of life-history evolution and its impact of genome architectures; the study of the genomic bases of phenotypic plasticity and the study of the genomic bases of adaptation and speciation.
Download or read book Developmental Timing written by and published by Academic Press. This book was released on 2013-09-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new volume of Current Topics in Developmental Biology covers developmental timing, with contributions from an international board of authors. The chapters provide a comprehensive set of reviews covering such topics as the timing of developmental programs in Drosophila, temporal patterning of neural progenitors, and environmental modulation of developmental timing.
Download or read book The Genetic Structure and Agronomic Importance of the Juvenile to Adult Vegetative Phase Change in Maize Zea Mays L written by and published by . This book was released on 2013 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: All plants pass through several different phases during development. The timing and duration of the transition between these phases is important both for plant fitness as well as agronomically. In maize, those phases are the juvenile vegetative, adult vegetative and reproductive. Juvenile and adult tissues differ dramatically in their anatomical and biochemical composition, which affects both potential for animal feed and biofuel feedstock as well as disease and insect resistance. While the timing of the vegetative to reproductive transition is well characterized and studied, the molecular network controlling juvenile to adult vegetative phase change in maize is poorly understood. The objective of my thesis was to characterize the genetic structure of this developmental transition as well as assess it's agronomic potential for use in the lignocellulosic ethanol industry. The Nested Association Mapping Population (NAM) as well as two novel mapping populations, without the use of B73 as a parent, were used to characterize the genetic structure and identify QTL controlling the timing of vegetative phase change. Using high-resolution genomic maps, novel QTL and candidate genes were identified. Stover of extreme genotypes for early and late timing of vegetative phase change were identified from the NAM population and evaluated as inbreds per se as and in a hybrid context. Although phenotypic diversity for the timing of vegetative phase change existed, none of the composition or digestibility traits were significantly different between early and late transitioning lines. Our results show that stover composition will not change with extended juvenility.
Download or read book Advances in Wheat Genetics From Genome to Field written by Yasunari Ogihara and published by Springer. This book was released on 2015-09-15 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings is a collection of 46 selected papers that were presented at the 12th International Wheat Genetics Symposium (IWGS). Since the launch of the wheat genome sequencing project in 2005, the arrival of draft genome sequences has marked a new era in wheat genetics and genomics, catalyzing rapid advancement in the field. This book provides a comprehensive review of the forefront of wheat research, across various important topics such as germplasm and genetic diversity, cytogenetics and allopolyploid evolution, genome sequencing, structural and functional genomics, gene function and molecular biology, biotic stress, abiotic stress, grain quality, and classical and molecular breeding. Following an introduction, 9 parts of the book are dedicated to each of these topics. A final, 11th part entitled “Toward Sustainable Wheat Production” contains 7 excellent papers that were presented in the 12th IWGS Special Session supported by the OECD. With rapid population growth and radical climate changes, the world faces a global food crisis and is in need of another Green Revolution to boost yields of wheat and other widely grown staple crops. Although this book focuses on wheat, many of the newly developed techniques and results presented here can be applied to other plant species with large and complex genomes. As such, this volume is highly recommended for all students and researchers in wheat sciences and related plant sciences and for those who are interested in stable food production and food security.
Download or read book Epigenetics in Plants of Agronomic Importance Fundamentals and Applications written by Raúl Alvarez-Venegas and published by Springer. This book was released on 2014-07-22 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decades, chromatin remodelling has emerged as an important regulator of gene expression and plant defense. This book provides a detailed understanding of the epigenetic mechanisms involved in plants of agronomic importance. The information presented here is significant because it is expected to provide the knowledge needed to develop in the future treatments to manipulate and selectively activate/inhibit proteins and metabolic pathways to counter pathogens, to treat important diseases and to increase crop productivity. New approaches of this kind and the development of new technologies will certainly increase our knowledge of currently known post-translational modifications and facilitate the understanding of their roles in, for example, host-pathogen interactions and crop productivity. Furthermore, we provide important insight on how the plant epigenome changes in response to developmental or environmental stimuli, how chromatin modifications are established and maintained, to which degree they are used throughout the genome, and how chromatin modifications influence each another.
Download or read book Maize Kernel Development written by Brian A Larkins and published by CABI. This book was released on 2017-11-21 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an authoritative book that acts as a guide to understanding maize kernel development. Written by a team of experts, it covers topics spanning pre- and post-fertilization events, embryo and endosperm development, grain filling and maturation, and factors influencing crop yield. It explores the significance of maize and other cereal grains, existing hypotheses and research, and important gaps in our knowledge and how we might fill them. This is a valuable resource for researchers of maize and other cereals, and anyone working on basic or applied science in the fields of seed development, plant genetics, and crop physiology.
Download or read book Photomorphogenesis in Plants written by Richard E. Kendrick and published by Springer Science & Business Media. This book was released on 1994 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt: David Dickinson is a household name, the king of the catchphrase, undisputed darling of daytime TV and a rising star. He's a respected antiques expert and exudes a taste for the finer things in life. But the road to his success has not been as smooth as his patter and he's learnt a lot at the school of hard knocks.
Download or read book Petunia written by Tom Gerats and published by Springer Science & Business Media. This book was released on 2008-12-11 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: Petunia belongs to the family of the Solanaceae and as such is closely related to important crop species like tomato, potato, eggplant, pepper and tobacco. With around 35 species described it is one of the smaller genera and among those there are two groups of species that make up the majority of them: the purple flowered P.integrifolia group and the white flowered P.axillaris group. It is assumed that interspecific hybrids between members of these two groups have laid the foundation for the huge variation in cultivars as selected from the 1830’s onwards. Petunia thus has been a commercially important ornamental since the early days of horticulture. Despite that, Petunia was in use as a research model only parsimoniously until the late fifties of the last century. By then seed companies started to fund academic research, initially with the main aim to develop new color varieties. Besides a moment of glory around 1980 (being elected a promising model system, just prior to the Arabidopsis boom), Petunia has long been a system in the shadow. Up to the early eighties no more then five groups developed classical and biochemical genetics, almost exclusively on flower color genes. Then from the early eighties onward, interest has slowly been growing and nowadays some 20-25 academic groups around the world are using Petunia as their main model system for a variety of research purposes, while a number of smaller and larger companies are developing further new varieties. At present the system is gaining credibility for a number of reasons, a very important one being that it is now generally realized that only comparative biology will reveal the real roots of evolutionary development of processes like pollination syndromes, floral development, scent emission, seed survival strategies and the like. As a system to work with, Petunia combines advantages from several other model species: it is easy to grow, sets abundant seeds, while self- and cross pollination is easy; its lifecycle is four months from seed to seed; plants can be grown very densely, in 1 cm2 plugs and can be rescued easily upon flowering, which makes even huge selection plots easy to handle. Its flowers (and indeed leaves) are relatively large and thus obtaining biochemical samples is no problem. Moreover, transformation and regeneration from leaf disc or protoplast are long established and easy-to-perform procedures. On top of this easiness in culture, Petunia harbors an endogenous, very active transposable element system, which is being used to great advantage in both forward and reverse genetics screens. The virtues of Petunia as a model system have only partly been highlighted. In a first monograph, edited by K. Sink and published in 1984, the emphasis was mainly on taxonomy, morphology, classical and biochemical genetics, cytogenetics, physiology and a number of topical subjects. At that time, little molecular data was available. Taking into account that that first monograph will be offered electronically as a supplement in this upcoming edition, we would like to put the overall emphasis for the second edition on molecular developments and on comparative issues. To this end we propose the underneath set up, where chapters will be brief and topical. Each chapter will present the historical setting of its subject, the comparison with other systems (if available) and the unique progress as made in Petunia. We expect that the second edition of the Petunia monograph will draw a broad readership both in academia and industry and hope that it will contribute to a further expansion in research on this wonderful Solanaceae.
Download or read book Photoperiodism in Plants written by Brian Thomas and published by Elsevier. This book was released on 1996-10-17 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoperiodism is the response to the length of the day that enables living organisms to adapt to seasonal changes in their environment as well as latitudinal variation. As such, it is one of the most significant andcomplex aspects of the interaction between plants and their environment and is a major factor controlling their growth and development. As the new and powerful technologies of molecular genetics are brought to bear on photoperiodism, it becomes particularly important to place new work in the context of the considerable amount of physiological information which already exists on the subject. This innovative book will be of interest to a wide range of plant scientists, from those interested in fundamental plant physiology and molecular biology to agronomists and crop physiologists. - Provides a self-sufficient account of all the important subjects and key literature references for photoperiodism - Includes research of the last twenty years since the publication of the First Edition - Includes details of molecular genetic techniques brought to bear on photoperiodism
Download or read book Agroclimatology written by Jerry L. Hatfield and published by John Wiley & Sons. This book was released on 2020-01-22 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt: Can we unlock resilience to climate stress by better understanding linkages between the environment and biological systems? Agroclimatology allows us to explore how different processes determine plant response to climate and how climate drives the distribution of crops and their productivity. Editors Jerry L. Hatfield, Mannava V.K. Sivakumar, and John H. Prueger have taken a comprehensive view of agroclimatology to assist and challenge researchers in this important area of study. Major themes include: principles of energy exchange and climatology, understanding climate change and agriculture, linkages of specific biological systems to climatology, the context of pests and diseases, methods of agroclimatology, and the application of agroclimatic principles to problem-solving in agriculture.
Download or read book Handbook of Maize Its Biology written by Jeff L. Bennetzen and published by Springer Science & Business Media. This book was released on 2008-12-25 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook of Maize: Its Biology centers on the past, present and future of maize as a model for plant science research and crop improvement. The book includes brief, focused chapters from the foremost maize experts and features a succinct collection of informative images representing the maize germplasm collection.
Download or read book Spraying Experiments written by and published by . This book was released on 1904 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Plant Cell Cycle written by Dirk Inzé and published by Springer Science & Business Media. This book was released on 2011-06-27 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, the study of the plant cell cycle has become of major interest, not only to scientists working on cell division sensu strictu , but also to scientists dealing with plant hormones, development and environmental effects on growth. The book The Plant Cell Cycle is a very timely contribution to this exploding field. Outstanding contributors reviewed, not only knowledge on the most important classes of cell cycle regulators, but also summarized the various processes in which cell cycle control plays a pivotal role. The central role of the cell cycle makes this book an absolute must for plant molecular biologists.
Download or read book Safety of Genetically Engineered Foods written by National Research Council and published by National Academies Press. This book was released on 2004-07-08 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assists policymakers in evaluating the appropriate scientific methods for detecting unintended changes in food and assessing the potential for adverse health effects from genetically modified products. In this book, the committee recommended that greater scrutiny should be given to foods containing new compounds or unusual amounts of naturally occurring substances, regardless of the method used to create them. The book offers a framework to guide federal agencies in selecting the route of safety assessment. It identifies and recommends several pre- and post-market approaches to guide the assessment of unintended compositional changes that could result from genetically modified foods and research avenues to fill the knowledge gaps.
Download or read book MicroRNA Protocols written by Shao-Yao Ying and published by Springer Science & Business Media. This book was released on 2008-02-04 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: MicroRNA Protocols provides diverse, novel, and useful descriptions of miRNAs in several species, including plants, worms, flies, fish, chicks, mice, and humans. These include some useful adaptations and applications that could be relevant to the wider research community who are already familiar with the identification of miRNAs. This volume will stimulate the reader to explore diverse ways to understanding the mechanism in which miRNAs facilitate the molecular aspects of the biomedical research.
