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Stigma Receptivity Is Controlled by Functionally Redundant MAPK Pathway Components in Arabidopsis
Muhammad Jamshed1, Subramanian Sankaranarayanan2, Kumar Abhinandan3
1University of Calgary, BI 392, Department of Biological Sciences, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada; Senior Scientist, Frontier Agri-Science Inc, 98 Ontario Street, Port Hope, ON L1A 2V2, Canada.
Molecular Plant
|September 5, 2020
Summary
A study in Arabidopsis reveals a functional redundancy in mitogen-activated protein kinase (MAPK) cascades essential for stigma receptivity. This MAPK pathway regulates compatible pollination by converging on Exo70A1, a key factor for plant reproduction.
Area of Science:
- Plant reproductive biology
- Molecular signaling in plants
Background:
- Angiosperm pollination involves specific interactions between pollen and pistil.
- In Brassicaceae, dry stigma cells control pollen germination, but regulatory signaling remains unclear.
Purpose of the Study:
- To elucidate the signaling mechanisms regulating stigma receptivity in Arabidopsis.
- To identify the molecular components involved in compatible pollination.
Main Methods:
- Genetic analysis of mitogen-activated protein kinase (MAPK) cascades in Arabidopsis stigmas.
- Creation and analysis of quintuple MKK and double MPK mutants.
- Investigation of the convergence of MAPK signaling on the Exo70A1 factor.
Main Results:
- A functionally redundant MAPK cascade involving MKK1/2/3/7/9 and MPK3/4 is crucial for stigma receptivity.
- Mutants lacking these MAPK components exhibit pollination defects similar to known pollination mutants.
- The MAPK pathway converges on Exo70A1, a known factor essential for pollination.
Conclusions:
- Mitogen-activated protein kinase (MAPK) cascades play a vital role in regulating stigma receptivity and compatible pollination in Arabidopsis.
- Understanding these signaling pathways could inform strategies to enhance crop yield by improving pollination success.
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