Abstract:

Exogenous GABA was applied on Caragana intermedia seedlings under NaCl stress. The results showed that the plants treated with 200 mmol·L^-1
significantly increase in ethylene production in 72 h, while exogenous GABA could further enhance the production of ethylene. At early stage treatments of 250 mmol·L^-1NaCl and exogenous GABA, NaCltreated tissues showed obvious increase in ethylene production, whereas exogenous GABA inhibited the production of ethylene in the NaCltreated tissues. With the extension of treated time, exogenous GABA did promote the production of ethylene. At the transcriptional level, exogenous GABA induced more expression of aminocyclopropane1carboxylie acid (ACC) oxydase genes, [STBX] CaACO1 and CaACO ₂ [STBZ] in C. intermedia that was under NaCl stress, compared with NaCl stress only. 

Key words: Caragana intermedia, NaCl stress, γ aminobutyric acid, ethylene