Mobile Gibberellin Directly Stimulates Arabidopsis Hypocotyl Xylem Expansion

被引:175
作者
Ragni, Laura [1 ]
Nieminen, Kaisa [1 ]
Pacheco-Villalobos, David [1 ]
Sibout, Richard [1 ]
Schwechheimer, Claus [2 ]
Hardtke, Christian S. [1 ]
机构
[1] Univ Lausanne, Dept Plant Mol Biol, CH-1015 Lausanne, Switzerland
[2] Tech Univ Munich, Ctr Life & Food Sci Weihenstephan, D-85354 Freising Weihenstephan, Germany
基金
瑞士国家科学基金会;
关键词
POLAR AUXIN TRANSPORT; HOMEOBOX GENES PENNYWISE; WOOD-FORMING TISSUES; VASCULAR TISSUE; BIOMASS PRODUCTION; FLOWERING-TIME; POUND-FOOLISH; HYBRID ASPEN; SIGNALS; GROWTH;
D O I
10.1105/tpc.111.084020
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Secondary growth of the vasculature results in the thickening of plant structures and continuously produces xylem tissue, the major biological carbon sink. Little is known about the developmental control of this quantitative trait, which displays two distinct phases in Arabidopsis thaliana hypocotyls. The later phase of accelerated xylem expansion resembles the secondary growth of trees and is triggered upon flowering by an unknown, shoot-derived signal. We found that flowering-dependent hypocotyl xylem expansion is a general feature of herbaceous plants with a rosette growth habit. Flowering induction is sufficient to trigger xylem expansion in Arabidopsis. By contrast, neither flower formation nor elongation of the main inflorescence is required. Xylem expansion also does not depend on any particular flowering time pathway or absolute age. Through analyses of natural genetic variation, we found that ERECTA acts locally to restrict xylem expansion downstream of the gibberellin (GA) pathway. Investigations of mutant and transgenic plants indicate that GA and its signaling pathway are both necessary and sufficient to directly trigger enhanced xylogenesis. Impaired GA signaling did not affect xylem expansion systemically, suggesting that it acts downstream of the mobile cue. By contrast, the GA effect was graft transmissible, suggesting that GA itself is the mobile shoot-derived signal.
引用
收藏
页码:1322 / 1336
页数:15
相关论文
共 63 条
[1]   Integration of plant responses to environmentally activated phytohormonal signals [J].
Achard, P ;
Cheng, H ;
De Grauwe, L ;
Decat, J ;
Schoutteten, H ;
Moritz, T ;
Van Der Straeten, D ;
Peng, JR ;
Harberd, NP .
SCIENCE, 2006, 311 (5757) :91-94
[2]   Regulation of flowering time and floral organ identity by a microRNA and its APETALA2-like target genes [J].
Aukerman, MJ ;
Sakai, H .
PLANT CELL, 2003, 15 (11) :2730-2741
[3]   Vascular continuity and auxin signals [J].
Berleth, T ;
Mattsson, J ;
Hardtke, CS .
TRENDS IN PLANT SCIENCE, 2000, 5 (09) :387-393
[4]   Impact of altered gibberellin metabolism on biomass accumulation, lignin biosynthesis, and photosynthesis in transgenic tobacco plants [J].
Biemelt, S ;
Tschiersch, H ;
Sonnewald, U .
PLANT PHYSIOLOGY, 2004, 135 (01) :254-265
[5]   Cross-talk between gibberellin and auxin in development of Populus wood:: gibberellin stimulates polar auxin transport and has a common transcriptome with auxin [J].
Bjorklund, Simon ;
Antti, Henrik ;
Uddestrand, Ida ;
Moritz, Thomas ;
Sundberg, Bjorn .
PLANT JOURNAL, 2007, 52 (03) :499-511
[6]   APL regulates vascular tissue identity in Arabidopsis [J].
Bonke, M ;
Thitamadee, S ;
Mähönen, AP ;
Hauser, MT ;
Helariutta, Y .
NATURE, 2003, 426 (6963) :181-186
[7]   Loss of function of four DELLA genes leads to light- and gibberellin-independent seed germination in Arabidopsis [J].
Cao, DN ;
Hussain, A ;
Cheng, H ;
Peng, JR .
PLANTA, 2005, 223 (01) :105-113
[8]   Molecular characterisation of the Arabidopsis SBP-box genes [J].
Cardon, G ;
Höhmann, S ;
Klein, J ;
Nettesheim, K ;
Saedler, H ;
Huijser, P .
GENE, 1999, 237 (01) :91-104
[9]   Phloem and xylem specification: pieces of the puzzle emerge [J].
Carlsbecker, A ;
Helariutta, Y .
CURRENT OPINION IN PLANT BIOLOGY, 2005, 8 (05) :512-517
[10]   Secondary xylem development in Arabidopsis:: a model for wood formation [J].
Chaffey, N ;
Cholewa, E ;
Regan, S ;
Sundberg, B .
PHYSIOLOGIA PLANTARUM, 2002, 114 (04) :594-600