不同水陆生境下入侵种喜旱莲子草表型可塑性变异的发生与植物激素信号的关系.pdf

Botanical Research 植物学研究, 2014, 3, 155-163 Published Online July 2014 in Hans. /journal/br /10.12677/br.2014.34020 Relationship between the Development of Phenotypically Plastic Variation and Phytohormone Signaling of Alt ernanthera philoxeroides (Mart.) Griseb. under Different Water Habitats Lexuan Gao Shanghai Chenshan Botanical Garden, Shanghai Email: lexuangao@ nd st st Received: May 22 , 2014; revised: Jun. 21 , 2014; accepted: Jul. 1 , 2014 Copyright © 2014 by author and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract Alternanthera philoxeroides (Mart.) Griseb. is a malignant invasive weed in China. It has success- fully invaded both aquatic and terrestrial habitats through phenotypic plasticity. To understand the signaling pathways potentially responsible for the development of phenotypically plastic vari- ation in response to changing environment, A. philoxeroides were treated by a variety of phyto- hormones and their inhibitors under two common gardens, which respectively simulated the typ- ical aquatic and terrestrial habitats colonized by A. philoxeroides in natural environments, then morphological variations among plants under different treatments were compared. The results showed that pond habitat promoted rapid elongation of internodes and further expansion of stem pith cavity in A. philoxeroides, contributing to their adaptation to submergence; ethylene was in- volved in both internode elongation and stem pith cavity expansion process, gibberellin was only involved in the internode elongation process, and auxin was only involved in the