REGULATORY ROLE OF AUXIN IN ADVENTITIOUS ROOT-FORMATION IN 2 SPECIES OF RUMEX, DIFFERING IN THEIR SENSITIVITY TO WATERLOGGING

被引:58
作者
VISSER, EJW
HEIJINK, CJ
VANHOUT, KJGM
VOESENEK, LACJ
BARENDSE, GWM
BLOM, CWPM
机构
[1] Dept of Ecology, Univ. of Nijmegen, Nijmegen, 6525 ED, Toernooiveld
关键词
ADVENTITIOUS ROOTS; AUXIN TRANSPORT; FLOODING; HYPOXIA; IAA; NAA; NPA; RUMEX PALUSTRIS; RUMEX THYRSIFLORUS;
D O I
10.1034/j.1399-3054.1995.930117.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Adventitious rooting in Rumex plants, in which the root systems were in hypoxic conditions, differed considerably between two species. R. palustris, a species from frequently flooded river forelands, developed a large number of adventitious roots during hypoxia, whereas adventitious root formation was poor in R. thyrsiflorus, a species from seldom flooded dykes and river dunes. Adventitious rooting could also be evoked in aerated plants of both species by application of auxin (1-naphthaleneacetic acid or indoleacetic acid) to the leaves. The response to auxin was dose-dependent, but even high auxin doses could not stimulate R. thyrsiflorus to produce as many adventitious roots as R. palustris. Consequently, the difference between the species in the amount of adventitious root formation was probably genetically determined, and not a result of a different response to auxin. A prerequisite for hypoxia-induced adventitious root formation is the basipetal transport of auxin within the shoot, as specific inhibition of this transport by N-1-naphthylphthalamic acid severely decreased the number of roots in hypoxia-treated plants. It is suggested that hypoxia of the root system causes stagnation of auxin transport in the root system. This can lead to an accumulation of auxin at the base of the shoot rosette, resulting in adventitious root formation.
引用
收藏
页码:116 / 122
页数:7
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