h Annual Review of Plant Biology Volume 58, 2007 n Wettstein \nalysis of Mutants to Genetic Engineering von Wettstein Phototropin Blue-Light Receptors John M. Christie Nutrient Sensing and Signaling: NPKS Daniel P. Schachtman and Ryoung Shin Hydrogenases and Hydrogen Photoproduction in Oxygenic Photosynthetic Organisms Varia L. Ghirardi, Matthew C. Posewitz, Pin-Ching Maness, Alexandra Dubini, Fianpinge Yu, and Michael Seibert Hidden Branches: Developments in Root System Architecture Karen S. Osmont, Richard Sibout, and Christian S. Hardtke Leaf Senescence Pyung Ok Lim, Hyo Fung Kim, and Hong Gil Nam Phe Biology of Arabinogalactan Proteins Ci g7 Seifert and Keith Roberts Stomatal Development Dominique C. Bergmann and Fred D. Sack Gibberellin Receptor and Its Role in Gibberellin Signaling in Plants Viyako Ueguchi-Tanaka, Masatoshi Nakajima, Ishikari Motoyuki, and Makoto Matsuoka Cyclic Electron Transport Around Photosystem I: Genetic Approaches T ‘oshibaru Shikanai Light Regulation of Stomatal Movement Ken-ichiro Shimazaki, Michio Doi, Sarah M. Assmann, and Toshinori Kinoshita The Plant Heterotrimeric G-Protein Complex Brenda R.S. Temple and Alan M. Jones Alternative Splicing of Pre-Messenger RNAs in Plants in the Genomic Era y {nireddy S.N. Reddy The Production of Unusual Fatty Acids in ‘Transgenic Plants Johnathan A. Napier letrapyrrole Biosynthesis in Higher Plants Ryouichi Tanaka and Ayumi Tanaka Plant ATP-Binding Cassette ‘Transporters Philip A. Rea Genetic and Epigenetic Mechanisms for Gene Expression and Phenotypic Variation in Plant Polyploids yA Te thre y Chen Iracheary Element Differentiation Simon Turner, Patrick Gallois, and David Brown Populus: A Viodel Sy stem for Plant Biology Stefan Jansson and Carl7 . Douglas Oxidative Modifications to Cellular Components in Plants lan M. Moller, Poul Erik Jensen, and Andreas Hansson Indexes Cumulative Index of Contributing Authors, Volumes 48-58 Cumulative Index of Chapter Titles, Volumes 48-58 Errata \n online log of corrections to Annual Review of Plant Biology chapters (if any, 1997 to the present) may be found at http://plant.annualreviews.org/ -