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Table of Contents

Plant Physiology: 148 (1)
Sep 2008

Cover image

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On the Cover: Cool C4 Photosynthesis in Miscanthus × giganteus
The bioenergy feedstock grass Miscanthus × giganteus is exceptional among C4 species for its high productivity in cold climates. It can maintain photosynthetically active leaves at temperatures 6°C below the minimum for maize (Zea mays), which allows it to have a longer growing season in cool climates. Understanding the basis for this difference between these two closely related plants is critical in adapting other C4 crops like maize to colder weather. In this issue, Wang et al. (pp. 557–567) establish a link between cold tolerance and increased expression and activity of a C4 enzyme: pyruvate Pi dikinase (PPDK). Their data indicate that of the two enzymes known to limit C4 photosynthesis, increase of PPDK, not Rubisco, content corresponds to the recovery and maintenance of photosynthetic capacity in M. × giganteus, by increasing the stability of the active form of PPDK at low temperature. The finding may indicate how other related C4 crops, such as sorghum (Sorghum bicolor) and maize, might be adapted for improved production in cool climates. The cover image is created and provided by Patrick Schmitz, Rachel Knepp, and Dafu Wang of the University of Illinois.

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Plant Physiology: 148 (1)
Plant Physiology
Vol. 148, Issue 1
September 2008
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