Endogenous ethylene and reversing methyl jasmonate inhibition of Amaranthus caudatus seed germination by benzyladenine or gibberellin

摘要

BA at 10(-5) M, GA(3) at 3 x 10(-4) M or GA(4+7) at 3 x 10(-5) M partially or largely reversed the inhibition of Amaranthus caudatus seed germination due to JA-Me. BA or GA(3) did not affect ethylene production and ACC oxidase activity in vivo in the presence of JA-Me before radicle protrusion. However, both increased ethylene production after 72 h of incubation, when the reversal of the JA-Me inhibition of seed germination was observed. AVG at 3 x 10(-4) M decreased ethylene production when it was applied simultaneously with BA and JA-Me or GA(3) and JA-Me, but it had no effect on seed germination. NBD almost completely reversed the stimulatory effect of BA, GA(3) or GA(4+7) on the germination of seeds in the presence of JA-Me. Exogenous ethylene reversed the inhibitory effect of NBD. The results indicate that action of endogenous ethylene is involved in the response of JA-Me inhibited seeds to BA or GA(s) [References: 12]