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Reduction of indole-3-acetic acid methyltransferase activity compensates for high-temperature male sterility in Arabidopsis

Abbas, Mohamad; Hernández-García, Jorge; Blanco-Tourin, Noel; Aliaga, Norma; Minguet, Eugenio G.; Alabadí, David; Blázquez, Miguel A.

Authors

Mohamad Abbas mohamad.abbas@nottingham.ac.uk

Jorge Hernández-García jorherga@ibmcp.upv.es

Noel Blanco-Tourin noelblanco@ibmcp.upv.es

Norma Aliaga noralfra@posgrado.upv.es

Eugenio G. Minguet egomezm@ibmcp.upv.es

David Alabadí dalabadi@ibmcp.upv.es

Miguel A. Blázquez mblazquez@ibmcp.upv.es



Abstract

High temperature is a general stress factor that causes a decrease in crop yield. It has been shown that auxin application reduces the male sterility caused by exposure to higher temperatures. However, widespread application of a hormone with vast effects on plant physiology may be discouraged in many cases. Therfore, the generation of new plant varieties that locally enhance auxin in reproductive organs may represent an alternative strategy. We have explored the possibility of increasing indoleacetic acid (IAA) in ovaries by reducing IAA METHYLTRANSFERASE1 (IAMT1) activity in Arabidopsis thaliana. The iamt1 mutant showed increased auxin signaling in funiculi, which correlated with a higher growth rate of wild-type pollen in contact with mutant ovaries and premature ovule fertilization. While the production of seeds per fruit was similar in the wild type and the mutant at 20°C, exposure to 29°C caused a more severe decrease in fertility in the wild type than in the mutant. Loss of IAMT1 activity was also associated with to the production of more nodes after flowering and higher tolerance of the shoot apical meristem to higher temperatures. As a consequence, the productivity of the iamt1 mutant under higher temperatures was more than double of that of the wild type, with almost no apparent trade-off.

Journal Article Type Article
Publication Date Jan 25, 2018
Journal Plant Biotechnology Journal
Print ISSN 1467-7644
Electronic ISSN 1467-7652
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 16
Issue 1
APA6 Citation Abbas, M., Hernández-García, J., Blanco-Tourin, N., Aliaga, N., Minguet, E. G., Alabadí, D., & Blázquez, M. A. (2018). Reduction of indole-3-acetic acid methyltransferase activity compensates for high-temperature male sterility in Arabidopsis. Plant Biotechnology Journal, 16(1), https://doi.org/10.1111/pbi.12768
DOI https://doi.org/10.1111/pbi.12768
Publisher URL http://onlinelibrary.wiley.com/doi/10.1111/pbi.12768/abstract;jsessionid=8F973FBE5D601BD4FBA28DD9E3FA1D16.f01t03
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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