This article by K.S. Gould, New Zealand, highlights the diverse role of anthocyanins in plant physiology.
Carl Zimmer’s blog, The Loom, also has a nice write up of the age old question, ‘Why do leaves turn yellow?’
K.S. Gould 2004 Nature’s Swiss Army Knife Journal of Biomedicine and Biotechnology
Volume 2004 (2004), Issue 5, Pages 314-320