Evidence That Putrescine Modulates the Higher Plant Photosynthetic Proton Circuit Ioannidis, Nikolaos E. ; Cruz, Jeffrey A. ; Kotzabasis, Kiriakos ; Kramer, David M. Abstract Publication: PLoS ONE Pub Date: January 2012 DOI: 10.1371/journal.pone.0029864 Bibcode: 2012PLoSO...729864I