Chi G L, Pua E C, Goh C J
Institute of Molecular and Cell Biology, National University of Singapore, Kent Ridge, Singapore 0511, Republic of Singapore.
Plant Physiol. 1991 May;96(1):178-83. doi: 10.1104/pp.96.1.178.
The promotive effect of AgNO(3) and aminoethoxyvinylglycine (AVG) on in vitro shoot regeneration from cotyledons of Brassica campestris ssp. pekinensis in relation to endogenous 1-amino-cyclopropane-1-carboxylic acid (ACC) synthase, ACC, and ethylene production was investigated. AgNO(3) enhanced ACC synthase activity and ACC accumulation, which reached a maximum after 3 to 7 days of culture. ACC accumulation was concomitant with increased emanation of ethylene which peaked after 14 days. In contrast, AVG was inhibitory to endogenous ACC synthase activity and reduced ACC and ethylene production. The promotive effect of AVG on shoot regeneration was reversed by 2-chloroethylphosphonic acid at 50 micromolar or higher concentrations, whereas explants grown on AgNO(3) medium were less affected by 2-chloroethylphosphonic acid. The distinctive effect of AgNO(3) and AVG on endogenous ACC synthase, ACC, and ethylene production and its possible mechanisms are discussed.
研究了硝酸银(AgNO₃)和氨基乙氧基乙烯基甘氨酸(AVG)对白菜型油菜亚种小白菜子叶离体芽再生的促进作用,及其与内源性1-氨基环丙烷-1-羧酸(ACC)合酶、ACC和乙烯产生的关系。AgNO₃增强了ACC合酶活性和ACC积累,在培养3至7天后达到最大值。ACC积累伴随着乙烯释放增加,乙烯在14天后达到峰值。相反,AVG对内源性ACC合酶活性有抑制作用,并降低了ACC和乙烯的产生。50微摩尔或更高浓度的2-氯乙基膦酸可逆转AVG对芽再生的促进作用,而在AgNO₃培养基上生长的外植体受2-氯乙基膦酸的影响较小。讨论了AgNO₃和AVG对内源性ACC合酶、ACC和乙烯产生的独特作用及其可能机制。