Institut für Pflanzenbiologie, Technische Universität Braunschweig, Braunschweig, Germany.
Plant Biol (Stuttg). 2010 Mar;12(2):242-58. doi: 10.1111/j.1438-8677.2009.00305.x.
The plant hormones auxin and abscisic acid may at first sight appear to be a conflicting pair of plant regulators. Abscisic acid content increases during stress and protects plant water status. The content of free auxin in the developing xylem of poplar declines during stress, while auxin conjugates increase. This indicates that specific down-regulation of a signal transduction chain is important in plant adaptation to stress. Diminished auxin content may be a factor that adapts growth and wood development of poplar during adverse environmental conditions. To allow integration of environmental signals, abscisic acid and auxin must interact. Data are accumulating that abscisic acid-auxin cross-talk exists in plants. However, knowledge of the role of plant hormones in the response of trees to stress is scarce. Our data show that differences in the localisation of ABA synthesis exist between the annual, herbaceous plant Arabidopsis and the perennial woody species, poplar.
植物激素生长素和脱落酸乍一看似乎是一对相互矛盾的植物调节剂。脱落酸含量在胁迫期间增加，保护植物的水分状态。在胁迫过程中，杨树发育木质部中的游离生长素含量下降，而生长素结合物增加。这表明在植物适应胁迫的过程中，特定的信号转导链的下调是很重要的。生长素含量的降低可能是适应杨树在不利环境条件下生长和木材发育的一个因素。为了允许环境信号的整合，脱落酸和生长素必须相互作用。越来越多的证据表明，脱落酸-生长素的相互作用存在于植物中。然而，关于植物激素在树木对胁迫的反应中的作用的知识是有限的。我们的数据表明，ABA 合成的局部定位在一年生草本植物拟南芥和多年生木本植物杨树之间存在差异。
