**Strigolactone Signaling in Plants**

Marek Marzec

[97] Xu Q, Truong TT, Barrero JM, Jacobsen JV, Hocart CH, Gubler F. A role for jasmo‐ nates in the release of dormancy by cold stratification in wheat. Journal of Experimental

[98] Xi W, Yu H. MOTHER OF FT AND TFL1 regulates seed germination and fertility rele‐ vant to the brassinosteroid signaling pathway. Plant Signaling & Behavior. 2010;**5**:1315‐

[99] Hu Y, Yu D. BRASSINOSTEROID INSENSITIVE2 interacts with ABSCISIC ACID INSENSITIVE5 to mediate the antagonism of brassinosteroids to abscisic acid dur‐ ing seed germination in Arabidopsis. The Plant Cell. 2014;**26**:4394‐4408. DOI: 10.1105/

[100] Chitnis VR, Gao F, Yao Z, Jordan MC, Park S, Ayele BT. After‐ripening induced tran‐ scriptional changes of hormonal genes in wheat seeds: The cases of brassinosteroids, ethylene, cytokinin and salicylic acid. PloS One. 2014;**9**:e87543. DOI: 10.1371/journal.

[101] Narsai R, Law SR, Carrie C, Xu L, Whelan J. In‐depth temporal transcriptome profil‐ ing reveals a crucial developmental switch with roles for RNA processing and organ‐ elle metabolism that are essential for germination in Arabidopsis. Plant Physiology.

[102] Beaudoin N, Serizet C, Gosti F, Giraudat J. Interactions between abscisic acid and eth‐ ylene signaling cascades. The Plant Cell. 2000;**12**:1103‐1115. DOI: 10.1105/tpc.12.7.1103

[103] Chiwocha SD, Cutler AJ, Abrams SR, Ambrose SJ, Yang J, Ross AR, Kermode AR. The *etr1‐2* mutation in Arabidopsis thaliana affects the abscisic acid, auxin, cytokinin and gib‐ berellin metabolic pathways during maintenance of seed dormancy, moist‐chilling and germination. The Plant Journal. 2005;**42**:35‐48. DOI: 10.1111/j.1365‐313X.2005.02359.x

[104] Cheng WH, Chiang MH, Hwang SG, Lin PC. Antagonism between abscisic acid and ethylene in Arabidopsis acts in parallel with the reciprocal regulation of their metab‐ olism and signaling pathways. Plant Molecular Biology. 2009;**71**:61‐80. DOI: 10.1007/

[105] Wang Z, Cao H, Sun Y, Li X, Chen F, Carles A, Li Y, Ding M, Zhang C, Deng X, Soppe WJ, Yong‐Xiu Liu YX. Arabidopsis paired amphipathic helix proteins SNL1 and SNL2 redundantly regulate primary seed dormancy via abscisic acid‐ethylene antagonism mediated by histone deacetylation. The Plant Cell. 2013;**25**:149‐166. DOI: 10.1105/

Botany. 2016;**67**:3497‐3508. DOI: 10.1093/jxb/erw172

100 Phytohormones - Signaling Mechanisms and Crosstalk in Plant Development and Stress Responses

2011;**157**:1342‐1362. DOI: 10.1104/pp.111.183129

1317. DOI: 10.4161/psb.5.10.13161

tpc.114.130849

pone.0087543

s11103‐009‐9509‐7

tpc.112.108191

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/intechopen.68497

#### **Abstract**

Strigolactones (SLs) are a new group of recently described phytohormones. They were found to be involved in the communication between plant roots and symbiotic bacteria or fungi, but also in the interactions between roots of host plants and germinating seeds of parasitic plants. Over the years, however, it has become clear that SLs play a regulatory role in many aspects of plant growth and development. Extensive studies on plant model species *Arabidopsis thaliana* L. and *Oryza sativa* L. have uncovered the molecular mecha‐ nisms of SL biosynthesis and signaling. In some aspects, the SL perception and signaling correspond to the already known mechanisms described for other phytohormones, but in other points, they seem to be unique in the plant kingdom. This chapter summarizes the recent discoveries in the signal transduction pathway of SLs and describes the model of SL perception and signaling.

**Keywords:** strigolactones (SLs), perception, signaling, degradation, SCF complex, receptor, repressor
