Premium
Inhibition of brassinosteroid‐induced epinasty in tomato plants by aminooxyacetic acid and Co 2+
Author(s) -
Schlagnhaufer Carl D.,
Arteca Richard N.
Publication year - 1985
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1985.tb02374.x
Subject(s) - aminooxyacetic acid , brassinosteroid , petiole (insect anatomy) , auxin , chemistry , ethylene , lycopersicon , horticulture , biochemistry , botany , biology , enzyme , arabidopsis , catalysis , hymenoptera , mutant , gene
The inhibitory effects of aminooxyacetic acid (AOA) and cobalt chloride (CoCl 2 ) on brassinosteroid (BR)‐induced epinasty in tomato plants ( Lycopersicon esculentum Mill. cv. Heinz 1350) are evaluated. CoCl 2 dramatically decreases petiole bending and ethylene production as the concentration increases from 50 to 200 μ M. The content of 1‐aminocyclopropane‐1‐carboxylic acid (ACC) in the petiole, instead of accumulating, is reduced and does not change over the concentration range tested. Inhibition of BR‐induced epinasty by AOA results from inhibition of ACC synthesis. There are dramatic reductions in petiole bending, ethylene and ACC production as the concentration of AOA is increased from 50 to 200 μ M. Maximum inhibition occurs when the plants are pretreated with the inhibitors. The degree of inhibition increases as the length of pretreatment increases from 1 to 4 h. The response of BR‐treated plants to AOA and CoCl 2 is similar to the effect of auxin, indicating the integral relationship between BR and auxin.