Department of Botany, Faculty of Science, University of Tokyo, Hongo, Tokyo, Japan.
Planta. 1974 Dec;115(4):345-54. doi: 10.1007/BF00388617.
The growth of Avena sativa L. coleoptiles was accelerated by reduction of the O2 concentration in the surrounding atmosphere. Cell-wall extensibility was increased in close relation to the increase in elongation, 6-8% O2 giving the optimal effect in either case. Growth promotion by reduced O2 concentration and by auxin (indole-3-acetic acid; IAA) were additive, at least at lower auxin concentrations.This response to reduced O2 concentration was also present in sections pretreated with cycloheximide for 2 h, although such sections showed no response to applied IAA. No significant change was observed in auxin transport under reduced O2 supply. It is suggested that the acceleration of cell elongation and the loosening of cell wall by reduced O2 supply are due to a mechanism which is not directly dependent on auxin-induced growth. We propose to designate this acceleration of growth under reduced O2 concentrations as oxygen-sensitive growth.
燕麦胚芽鞘的生长在周围大气中 O2 浓度降低的情况下会加速。细胞壁的延展性与伸长率的增加密切相关，在这两种情况下，6-8%的 O2 可产生最佳效果。降低 O2 浓度和生长素（吲哚-3-乙酸；IAA）的促进生长作用是相加的，至少在较低的生长素浓度下是这样。这种对低氧浓度的反应也存在于用环己酰亚胺预处理 2 小时的切片中，尽管这些切片对施加的 IAA 没有反应。在低氧供应下，生长素的运输没有观察到明显的变化。因此，低氧供应导致细胞伸长加速和细胞壁松弛，这是由于一种不直接依赖于生长素诱导生长的机制。我们建议将低氧浓度下的这种生长加速称为氧敏感生长。
