The Molecular Life of Plants

The Molecular Life of Plants

Howard Thomas

Language: English

Pages: 766

ISBN: 0470870125

Format: PDF / Kindle (mobi) / ePub

The Molecular Life of Plants

Howard Thomas

Language: English

Pages: 766

ISBN: 0470870125

Format: PDF / Kindle (mobi) / ePub


A stunning landmark co-publication between the American Society of Plant Biologists and Wiley-Blackwell.

The Molecular Life of Plants
presents students with an innovative, integrated approach to plant science. It looks at the processes and mechanisms that underlie each stage of plant life and describes the intricate network of cellular, molecular, biochemical and physiological events through which plants make life on land possible. Richly illustrated, this book follows the life of the plant, starting with the seed, progressing through germination to the seedling and mature plant, and ending with reproduction and senescence. This "seed-to-seed" approach will provide students with a logical framework for acquiring the knowledge needed to fully understand plant growth and development.

Written by a highly respected and experienced author team The Molecular Life of Plants will prove invaluable to students needing a comprehensive, integrated introduction to the subject across a variety of disciplines including plant science, biological science, horticulture and agriculture.

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the proteins in seeds that play a protective role are the many amylase and protease inhibitors, small molecular weight thionins, and lectins that bind and inactivate glycoproteins. Although they evolved to protect plants against predation, these antinutrients affect humans when foods containing them are consumed. Some antinutrients have useful medicinal properties. For example, amylase inhibitors reduce starch digestion and when taken orally they can be effective in promoting weight loss. Table

pathway to the regulation of flux through the pathway as a whole. Among the steps in glycolysis that are most influential on respiratory flux are those involving PFK and pyruvate kinase, which are feedback-regulated by downstream intermediates. The pyruvate dehydrogenase complex is regulated by phosphorylation/dephosphorylation and allosteric feedback. Some TCA cycle enzymes are inhibited by NADH and acetyl-CoA. The rate of electron transport and O2 uptake is determined by the sensitivity of the

abiotic stress, whereas AtNCED6 and AtNCED9 catalyze xanthoxin synthesis in seeds. Figure 10.33 Abscisic acid (ABA) biosynthesis from isopentenyl diphosphate begins in the plastid. Xanthoxin conversion to ABA occurs in the cytosol. AAO, ABA-oxidase; NCED, 9-cis-epoxycarotenoid dioxygenase; SDR, short chain dehydrogenase/reductase. Synthesis of ABA from xanthoxin occurs in the cytosol in two steps, beginning with the formation of ABA-aldehyde. In Arabidopsis the ABA2 gene encodes an enzyme that

compatible solutes, notably oligosaccharides of the raffinose family, occurs via an ABA-independent pathway. Genes in this pathway have a drought-responsive element in their promoter regions and are probably regulated by distinct or interacting signal transduction networks. Key Points Turgor is essential for plant structure and growth. Tissues die if water content falls below a critical level. Plants acclimate to inadequate water availability by accumulating osmotically active solutes.

by the development of major structures of the seed: the embryo, endosperm and seed coat. The seed coat originates in ovule integuments, the maternal tissues that provide protection and facilitate nutrient transfer to the developing embryo they surround. A fruit (see Figure 1.22) is defined as a structure derived from an ovary and bearing or containing seeds. It may be simple (originating as a single ovary), aggregate (from several separate ovaries of a single flower) or multiple (derived from an

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