In addition to updating the content throughout the chapters, the following major changes have been incorporated into the tenth edition:

• The first major change in this edition has been the development of a new art program. Our goal has been to maintain the detail and accuracy of the illustrations crafted over many editions, while creating new art that is colorful and dynamic. The new renderings feature shading, dimension, and color that gives students a true-to-life representation of plant structures. An added benefit are the electronic versions of the new art available on the Digital Content Manager, which allow you to incorporate and manipulate the figures for lecture presentations and exams.
• In Chapter 3, Cells, the section on modern microscopes has been updated to include phase-contrast, fluorescence, and confocal microscopy. The section on plastids has been reorganized to discuss thylakoids prior to stroma, since light reactions precede dark reactions. This sequence of topics is also consistent with the presentation of photosynthesis reactions in Chapter 10, Plant Metabolism.
• The revisions to Chapter 10, Plant Metabolism, include the rewriting of the water-splitting (photolysis) and photophosphororylation sections to reflect current scientific understanding and to make the sections easier to read. The description of electron transport has been expanded to better clarify how chemiosmosis leads to the production of ATP.
• Chapter 13, Genetics, has been updated to include a section on the role of nonprotein-coding DNA in gene expression.
• Chapter 25, Ecology, has been reorganized by first discussing individual plants, then plant populations and plant communities, followed by the impact of humans on plant communities at the global level, and finally at the regional level.
• Appendix 4, House Plants and Home Gardening, has been augmented to include discussions on pruning and grafting.