About the Cover
On the Cover: In response to phosphorus deficiency, various plant species from different families develop proteoid roots that induce high efficiency in phosphate acquisition. Proteoid roots are able to release large amounts of organic acids and strongly acidify the rhizosphere, thus mobilizing sparingly soluble soil phosphate. The cover shows rhizosphere acidification by proteoid roots of white lupin (Lupinus albus) in an agar medium containing a pH indicator (bromocresol purple), which turns red at pH > 6 and yellow at pH < 5. Yan et al. (pp. 50-63) demonstrate that rhizosphere acidification by proteoid roots of white lupin is attributed to an enhanced enzyme concentration of plasma membrane H+ ATPase.
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Copyright © 2007 by the American Society of Plant Biologists
