Whalen M C, Feldman L J
Department of Botany, University of California, Berkeley 94720.
Can J Bot. 1988 Apr;66(4):719-23. doi: 10.1139/b88-104.
The control of primary root growth in Zea mays cv. Merit by ethylene was examined. At applied concentrations of ethylene equal to or greater than 0.1 microliter L-1, root elongation during 24 h was inhibited. The half-maximal response occurred at 0.6 microliter L-1 and the response saturated at 6 microliters L-1. Inhibition of elongation took place within 20 min. However, after ethylene was removed, elongation recovered to control values within 15 min. Root elongation was also inhibited by green light. The inhibition caused by a 24-h exposure to ethylene was restricted to the elongating region just behind the apex, with inhibition of cortical cell elongation being the primary contributor to the effect. Based on use of 2,5-norbornadiene, a gaseous competitive inhibitor of ethylene, it was concluded that endogenous ethylene normally inhibits root elongation.
研究了乙烯对玉米品种优良（Zea mays cv. Merit）初生根生长的控制作用。当施加的乙烯浓度等于或大于0.1微升/升时，24小时内根的伸长受到抑制。半数最大反应发生在0.6微升/升，反应在6微升/升时达到饱和。伸长抑制在20分钟内发生。然而，去除乙烯后，伸长在15分钟内恢复到对照值。绿光也抑制根的伸长。24小时暴露于乙烯所引起的抑制作用仅限于根尖后方的伸长区域，皮层细胞伸长的抑制是这种效应的主要原因。基于使用乙烯的气态竞争性抑制剂2,5-降冰片二烯，得出内源性乙烯通常抑制根伸长的结论。
