Leaf tissue senescence: constant responsiveness to hormones despite a seasonal cycle in senescence rate.
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.
Manos
P J
PJ
The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138.
Goldthwaite
J
J