title: Leaf tissue senescence: constant responsiveness to hormones despite a seasonal cycle in senescence rate.
abstract: During winter, excised leaf tissue from Rumex obtusifolius degrades chlorophyll at twice the summer rate but the plant hormones, gibberellic acid and zeatin, inhibit the senescence rate by a constant percentage, regardless of season.
authors: The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138.
authors: P J
authors: PJ
authors: Manos
authors: J
authors: J
authors: Goldthwaite