Open AccessThe Influence of Gibberellic Acid and Temperature on the Growth Rate of Avena sativa Stem Segments
Author(s) -
M. Jusaitis,
L. G. Paleg,
D. Aspinall
Publication year - 1982
Publication title -
plant physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.554
H-Index - 312
eISSN - 1532-2548
pISSN - 0032-0889
DOI - 10.1104/pp.70.2.532
Subject(s) - avena , gibberellic acid , growth rate , botany , horticulture , chemistry , biology , germination , mathematics , geometry
A micro-growth measuring technique was used to determine the growth response of stem segments of Avena sativa cv. Avon to a variety of gibberellic acid (GA(3)) concentrations over a range of incubation temperatures. Growth rate varied with GA(3) concentration, the temperature at which the rate was measured, and the growth temperature of the plants prior to excision of the segments. The curves relating segment extension rates to temperature were affected by GA(3) such that the linear portion of the curve was shifted to higher rates as GA(3) concentration was increased. The results seem to be analogous to the GA(3)-induced shifts of thermally induced phase transitions in glucose leakage from liposomes, observed earlier (Wood, Paleg 1974 Aust J Plant Physiol 1: 31-40).