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Transcriptome profiling during mangrove viviparity in response to abscisic acid
Liwei Hong1, Wenyue Su1, Yuanye Zhang1
1Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, 361102, China.
Scientific Reports
|January 17, 2018
Summary
Abscisic acid (ABA) inhibits mangrove viviparity by repressing fruit growth. Mangroves possess a mechanism to prevent accidental ABA increases, ensuring their unique reproductive strategy in harsh coastal environments.
Area of Science:
- Plant Biology
- Reproductive Biology
- Coastal Ecology
Background:
- Mangrove plants exhibit viviparity, a specialized seed development strategy for coastal tidal mudflats.
- The genetic and molecular underpinnings of mangrove viviparity remain largely unexplored.
Purpose of the Study:
- To investigate the role of abscisic acid (ABA) in the precocious germination of viviparous *Kandelia obovata* seeds.
- To elucidate the molecular mechanisms by which ABA influences mangrove reproductive strategies.
Main Methods:
- Exogenous application of ABA to *Kandelia obovata* seeds.
- Transcriptome analysis to identify differentially expressed genes and altered pathways.
- Homologous alignment, phylogenetic analysis, and transgenic studies in *Arabidopsis* to validate gene function.
Main Results:
- ABA application repressed mangrove fruit growth and development, altering thousands of gene expressions.
- Key pathways affected include "Plant hormone signal transduction" and "MAPK signaling pathway".
- ABA signal transduction genes were induced, while ABA biosynthesis genes were repressed; ABI1 and ABI2 were found to be highly conserved.
Conclusions:
- Abscisic acid (ABA) inhibits mangrove viviparity.
- Mangroves have evolved mechanisms to prevent detrimental ABA level increases in challenging environments, preserving their viviparous reproductive strategy.
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