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Intertwined histories : plants in their social contexts
\"How do we understand the boundaries of individual creatures? What are the systems of interdependency that bind all living creatures together? Plants were among thefirst to colonize the planet. They created the soil and the atmosphere that made life possible for animals. They are some of the largest and oldest life forms on Earth. In spite of their primacy, Western cultures have traditionally regarded plants as the lowest life forms, lacking mobility, sensation, and communication. But recent research argues that plants move and respond to their environment, communicate with each other, and form partnerships with other species. Art, poetry, and essays by cultural anthropologists, experimental plant biologists, philosophers, botanists and foresters expose the complex interactions of the vibrant living world around us and give us a lens through which we can explore our intertwined histories.\"-- Provided by publisher.
Book
Corporate crops : biotechnology, agriculture, and the struggle for control
Biotechnology crop production area increased from 1.7 million hectares to 148 million hectares worldwide between 1996 to 2010. While genetically modified food is a contentious issue, the debates are usually limited to health and environmental concerns, ignoring the broader questions of social control that arise when food production methods become corporate-owned intellectual property. Drawing on legal documents and dozens of interviews with farmers and other stakeholders, Corporate Crops covers four case studies based around litigation between biotechnology corporations and farmers. Pechlaner investigates the extent to which the proprietary aspects of biotechnologies—from patents on seeds to a plethora of new rules and contractual obligations associated with the technologies—are reorganizing crop production. The lawsuits include patent infringement litigation launched by Monsanto against a Saskatchewan canola farmer who, in turn, claimed his crops had been involuntarily contaminated by the company’s GM technology; a class action application by two Saskatchewan organic canola farmers launched against Monsanto and Aventis (later Bayer) for the loss of their organic market due to contamination with GMOs; and two cases in Mississippi in which Monsanto sued farmers for saving seeds containing its patented GM technology. Pechlaner argues that well-funded corporate lawyers have a decided advantage over independent farmers in the courts and in creating new forms of power and control in agricultural production. Corporate Crops demonstrates the effects of this intersection between the courts and the fields where profits, not just a food supply, are reaped.
eBook
effects of auxin and strigolactones on tuber initiation and stolon architecture in potato
Various transcriptional networks and plant hormones have been implicated in controlling different aspects of potato tuber formation. Due to its broad impact on many plant developmental processes, a role for auxin in tuber initiation has been suggested but never fully resolved. Here, auxin concentrations were measured throughout the plant prior to and during the process of tuber formation. Auxin levels increase dramatically in the stolon prior to tuberization and remain relatively high during subsequent tuber growth, suggesting a promoting role for auxin in tuber formation. Furthermore, in vitro tuberization experiments showed higher levels of tuber formation from axillary buds of explants where the auxin source (stolon tip) had been removed. This phenotype could be rescued by application of auxin on the ablated stolon tips. In addition, a synthetic strigolactone analogue applied on the basal part of the stolon resulted in fewer tubers. The experiments indicate that a system for the production and directional transport of auxin exists in stolons and acts synergistically with strigolactones to control the outgrowth of the axillary stolon buds, similar to the control of above-ground shoot branching.
Journal Article
Plantopedia : a celebration of nature's greatest show-offs
Welcome to this collection of amazing plants from all over the world, chosen for their unique traits and characteristics, with fun illustrations by Adrienne Barman. Meet the evergreens, the edibles and the elderly plants that have outlived the dinosaurs in this alphabetically-ordered encyclopedia. Filled with fascinating flowers, curious crops and wonderful weeds, this book will keep young explorers busy for hours. A fantastic follow-up to smash-hit Creaturepedia.
Book
Mycorrhiza-Induced Resistance and Priming of Plant Defenses
Symbioses between plants and beneficial soil microorganisms like arbuscular-mycorrhizal fungi (AMF) are known to promote plant growth and help plants to cope with biotic and abiotic stresses. Profound physiological changes take place in the host plant upon root colonization by AMF affecting the interactions with a wide range of organisms below- and above-ground. Protective effects of the symbiosis against pathogens, pests, and parasitic plants have been described for many plant species, including agriculturally important crop varieties. Besides mechanisms such as improved plant nutrition and competition, experimental evidence supports a major role of plant defenses in the observed protection. During mycorrhiza establishment, modulation of plant defense responses occurs thus achieving a functional symbiosis. As a consequence of this modulation, a mild, but effective activation of the plant immune responses seems to occur, not only locally but also systemically. This activation leads to a primed state of the plant that allows a more efficient activation of defense mechanisms in response to attack by potential enemies. Here, we give an overview of the impact on interactions between mycorrhizal plants and pathogens, herbivores, and parasitic plants, and we summarize the current knowledge of the underlying mechanisms. We focus on the priming of jasmonate-regulated plant defense mechanisms that play a central role in the induction of resistance by arbuscular mycorrhizas.
Journal Article
Experiment with parts of a plant
\"Plants have roots, stems, leaves, and sometimes flowers. Each part of a plant does a special job. But do you know what a stem does? Or how different seeds travel away from their parent plants? Let's experiment to find out! Simple step-by-step instructions help readers explore science concepts and analyze information.\"--Provided by publisher.
Book
Gradual Increase of miR156 Regulates Temporal Expression Changes of Numerous Genes during Leaf Development in Rice
The highly conserved plant microRNA, miR156, is an essential regulator for plant development. In Arabidopsis (Arabidopsis ihaliana), miR156 modulates phase changing through its temporal expression in the shoot. In contrast to the gradual decrease over time in the shoot (or whole plant), we found that the miR156 level in rice (Oryza sativa) gradually increased from young leaf to old leaf after the juvenile stage. However, the miR156-targeted rice SQUAMOSA-promoter binding-like (SPL) transcription factors were either dominantly expressed in young leaves or not changed over the time of leaf growth. A comparison of the transcriptomes of early-emerged old leaves and later-emerged young leaves from wild-type and miR156 overexpression (miR156-OE) rice lines found that expression levels of 3,008 genes were affected in miR156-OE leaves. Analysis of temporal expression changes of these genes suggested that miR156 regulates gene expression in a leaf age-dependent manner, and miR156-OE attenuated the temporal changes of 2,660 genes. Interestingly, seven conserved plant microRNAs also showed temporal changes from young to old leaves, and miR156-OE also attenuated the temporal changes of six microRNAs. Consistent with global gene expression changes, miR156-OE plants resulted in dramatic changes including precocious leaf maturation and rapid leaf/tiller initiation. Our results indicate that another gradient of miR156 is present over time, a gradual increase during leaf growth, in addition to the gradual decrease during shoot growth. Gradually increased miR156 expression in the leaf might be essential for regulating the temporal expression of genes involved in leaf development.
Journal Article
Experiment with a plant's living environment
\"A plant's environment helps it grow. Weather, soil, and animals are important to a plant's survival. But do you know what happens to a plant when the seasons change? Or how earthworms help a plant's roots? Let's experiment to find out! Simple step-by-step instructions help readers explore science concepts and analyze information.\"--Provided by publisher.
Book
The Arabidopsis MicroRNA396-GRF1/GRF3 Regulatory Module Acts as a Developmental Regulator in the Reprogramming of Root Cells during Cyst Nematode Infection
The syncytium is a unique plant root organ whose differentiation is induced by plant-parasitic cyst nematodes to create a source of nourishment. Syncytium formation involves the redifferentiation and fusion of hundreds of root cells. The underlying regulatory networks that control this unique change of plant cell fate are not understood. Here, we report that a strong downregulation of Arabidopsis (Arabidopsis thaliana) microRNA396 (miR396) in cells giving rise to the syncytium coincides with the initiation of the syncytial induction/formation phase and that specific miR396 up-regulation in the developed syncytium marks the beginning of the maintenance phase, when no new cells are incorporated into the syncytium. In addition, our results show that miR396 in fact has a role in the transition from one phase to the other. Expression modulations of miR396 and its Growth-Regulating Factor (GRF) target genes resulted in reduced syncytium size and arrested nematode development. Furthermore, genome-wide expression profiling revealed that the miR396-GRF regulatory system can alter the expression of 44% of the more than 7,000 genes reported to change expression in the Arabidopsis syncytium. Thus, miR396 represents a key regulator for the reprogramming of root cells. As such, this regulatory unit represents a powerful molecular target for the parasitic animal to modulate plant cells and force them into novel developmental pathways.
Journal Article