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These results were in line with a previously reported study reporting that exogenous GABA increased the expression of GABA-T and SSADH in citrus plants (Hijaz and Killiny, 2019)

doi:10.1016/j.taap.2015.10.006

(2003) elucidated the interaction mechanism between HO-1 and HO-2, further confirming the effect of the HO-1/HO-2 protein complex on HO activity

Hogan SP, Koskinen A, Matthaei KI, Young IG, Foster PS