Auxin and Ethylene Regulate Elongation Responses to Neighbor Proximity Signals Independent of Gibberellin and DELLA Proteins in Arabidopsis

被引:144
作者
Pierik, Ronald [1 ]
Djakovic-Petrovic, Tanja [1 ]
Keuskamp, Diederik H. [1 ]
de Wit, Mieke [1 ]
Voesenek, Laurentius A. C. J. [1 ]
机构
[1] Univ Utrecht, Inst Environm Biol, NL-3584 CA Utrecht, Netherlands
关键词
SHADE-AVOIDANCE RESPONSES; LONG-HYPOCOTYL MUTANT; BLUE-LIGHT; GROWTH-RESPONSES; CELL ELONGATION; GENE-EXPRESSION; DIFFERENTIAL GROWTH; IDENTIFY ETHYLENE; ABSCISIC-ACID; STEM-GROWTH;
D O I
10.1104/pp.108.133496
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Plants modify growth in response to the proximity of neighbors. Among these growth adjustments are shade avoidance responses, such as enhanced elongation of stems and petioles, that help plants to reach the light and outgrow their competitors. Neighbor detection occurs through photoreceptor-mediated detection of light spectral changes (i. e. reduced red: far-red ratio [R:FR] and reduced blue light intensity). We recently showed that physiological regulation of these responses occurs through light-mediated degradation of nuclear, growth-inhibiting DELLA proteins, but this appeared to be only part of the full mechanism. Here, we present how two hormones, auxin and ethylene, coregulate DELLAs but regulate shade avoidance responses through DELLA-independent mechanisms in Arabidopsis (Arabidopsis thaliana). Auxin appears to be required for both seedling and mature plant shoot elongation responses to low blue light and low R: FR, respectively. Auxin action is increased upon exposure to low R: FR and low blue light, and auxin inhibition abolishes the elongation responses to these light cues. Ethylene action is increased during the mature plant response to low R: FR, and this growth response is abolished by ethylene insensitivity. However, ethylene is also a direct volatile neighbor detection signal that induces strong elongation in seedlings, possibly in an auxin-dependent manner. We propose that this novel ethylene and auxin control of shade avoidance interacts with DELLA abundance but also controls independent targets to regulate adaptive growth responses to surrounding vegetation.
引用
收藏
页码:1701 / 1712
页数:12
相关论文
共 62 条
[41]   Canopy studies on ethylene-insensitive tobacco identify ethylene as a novel element in blue light and plant-plant signalling [J].
Pierik, R ;
Whitelam, GC ;
Voesenek, LACJ ;
de Kroon, H ;
Visser, EJW .
PLANT JOURNAL, 2004, 38 (02) :310-319
[42]   Growth control by ethylene: Adjusting phenotypes to the environment [J].
Pierik, Ronald ;
Sasidharan, Rashmi ;
Voesenek, Laurentius A. C. J. .
JOURNAL OF PLANT GROWTH REGULATION, 2007, 26 (02) :188-200
[43]   The Janus face of ethylene: growth inhibition and stimulation [J].
Pierik, Ronald ;
Tholen, Danny ;
Poorter, Hendrik ;
Visser, Eric J. W. ;
Voesenek, Laurentius A. C. J. .
TRENDS IN PLANT SCIENCE, 2006, 11 (04) :176-183
[44]   INTERNODE LENGTH IN PISUM GIBBERELLINS AND THE RESPONSE TO FAR-RED-RICH LIGHT [J].
REID, JB ;
HASAN, O ;
ROSS, JJ .
JOURNAL OF PLANT PHYSIOLOGY, 1990, 137 (01) :46-52
[45]   Interaction of shade avoidance and auxin responses:: a role for two novel atypical bHLH proteins [J].
Roig-Villanova, Irma ;
Bou-Torrent, Jordi ;
Galstyan, Anahit ;
Carretero-Paulet, Lorenzo ;
Portolés, Sergi ;
Rodríguez-Conceptión, Manuel ;
Martínez-García, Jaime F. .
EMBO JOURNAL, 2007, 26 (22) :4756-4767
[46]   Evidence that auxin promotes gibberellin A1 biosynthesis in pea [J].
Ross, JJ ;
O'Neill, DP ;
Smith, JJ ;
Kerckhoffs, LHJ ;
Elliott, RC .
PLANT JOURNAL, 2000, 21 (06) :547-552
[47]   Ethylene regulates root growth through effects on auxin biosynthesis and transport-dependent auxin distribution [J].
Ruzicka, Kamil ;
Ljung, Karin ;
Vanneste, Steffen ;
Podhorska, Radka ;
Beeckman, Tom ;
Friml, Jiri ;
Benkova, Eva .
PLANT CELL, 2007, 19 (07) :2197-2212
[48]   Arabidopsis nph1 and npl1:: Blue light receptors that mediate both phototropism and chloroplast relocation [J].
Sakai, T ;
Kagawa, T ;
Kasahara, M ;
Swartz, TE ;
Christie, JM ;
Briggs, WR ;
Wada, M ;
Okada, K .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2001, 98 (12) :6969-6974
[49]   Understanding gibberellic acid signaling - are we there yet? [J].
Schwechheimer, Claus .
CURRENT OPINION IN PLANT BIOLOGY, 2008, 11 (01) :9-15
[50]   Compounds interacting with the ethylene receptor in plants [J].
Sisler, EC ;
Serek, M .
PLANT BIOLOGY, 2003, 5 (05) :473-480