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Re-evaluation of the ethylene-dependent and-independent pathways in the regulation of floral and organ abscission
Year:
2019
Source of publication :
Journal of Experimental Botany
Authors :
Meir, Shimon
;
.
Philosoph-Hadas, Sonia
;
.
Volume :
70
Co-Authors:

Riov, J., Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot, Israel; Tucker, M.L., Soybean Genomics and Improvement Lab, Agricultural Research Service, United States Department of Agriculture, BARC-West, Beltsville, MD, United States; Patterson, S.E., Department of Horticulture, University of Wisconsin-Madison, Madison, WI, United States; Roberts, J.A., Office of the Vice-Chancellor, Drake Circus, Plymouth, Devon, United Kingdom

Facilitators :
From page:
1461
To page:
1467
(
Total pages:
7
)
Abstract:

Abscission is a developmental process with important implications for agricultural practices. Ethylene has long been considered as a key regulator of the abscission process. The existence of an ethylene-independent abscission pathway, controlled by the complex of INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) peptide and the HAESA (HAE) and HAESA-like2 (HSL2) kinases, has been proposed, based mainly on observations that organ abscission in ethylene-insensitive mutants was delayed but not inhibited. A recent review on plant organ abscission signaling highlighted the IDA-HAE-HSL2 components as the regulators of organ abscission, while the role of auxin and ethylene in this process was hardly addressed. After a careful analysis of the relevant abscission literature, we propose that the IDA-HAE-HSL2 pathway is essential for the final stages of organ abscission, while ethylene plays a major role in its initiation and progression. We discuss the view that the IDA-HAE-HSL2 pathway is ethylene independent, and present recent evidence showing that ethylene activates the IDA-HAE-HSL2 complex. We conclude that the ability of an organ to abscise is tightly linked to cell turgidity in the abscission zone, and suggest that lack of cell turgidity might contribute to the failure of floral organ abscission in the ida mutants. © 2019 The Author(s).

Note:
Related Files :
abscission
Abscission induction
Abscission zone
arabidopsis
desiccation
ethylene
Flower organs
IDA
Turgor
Show More
Related Content
More details
DOI :
10.1093/jxb/erz038
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
Review
;
.
Language:
English
Editors' remarks:
ID:
39628
Last updated date:
02/03/2022 17:27
Creation date:
26/03/2019 13:24
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Scientific Publication
Re-evaluation of the ethylene-dependent and-independent pathways in the regulation of floral and organ abscission
70

Riov, J., Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot, Israel; Tucker, M.L., Soybean Genomics and Improvement Lab, Agricultural Research Service, United States Department of Agriculture, BARC-West, Beltsville, MD, United States; Patterson, S.E., Department of Horticulture, University of Wisconsin-Madison, Madison, WI, United States; Roberts, J.A., Office of the Vice-Chancellor, Drake Circus, Plymouth, Devon, United Kingdom

Re-evaluation of the ethylene-dependent and-independent pathways in the regulation of floral and organ abscission

Abscission is a developmental process with important implications for agricultural practices. Ethylene has long been considered as a key regulator of the abscission process. The existence of an ethylene-independent abscission pathway, controlled by the complex of INFLORESCENCE DEFICIENT IN ABSCISSION (IDA) peptide and the HAESA (HAE) and HAESA-like2 (HSL2) kinases, has been proposed, based mainly on observations that organ abscission in ethylene-insensitive mutants was delayed but not inhibited. A recent review on plant organ abscission signaling highlighted the IDA-HAE-HSL2 components as the regulators of organ abscission, while the role of auxin and ethylene in this process was hardly addressed. After a careful analysis of the relevant abscission literature, we propose that the IDA-HAE-HSL2 pathway is essential for the final stages of organ abscission, while ethylene plays a major role in its initiation and progression. We discuss the view that the IDA-HAE-HSL2 pathway is ethylene independent, and present recent evidence showing that ethylene activates the IDA-HAE-HSL2 complex. We conclude that the ability of an organ to abscise is tightly linked to cell turgidity in the abscission zone, and suggest that lack of cell turgidity might contribute to the failure of floral organ abscission in the ida mutants. © 2019 The Author(s).

Scientific Publication
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