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Kiwifruit SVP2 controls developmental and drought-stress pathways
Rongmei Wu1, Tianchi Wang1, Ben A W Warren1
1The New Zealand Institute for Plant and Food Research Limited (PFR) Mt Albert, Auckland Mail Centre, Private Bag 92169, Auckland, 1142, New Zealand.
Plant Molecular Biology
|December 10, 2017
Summary
Kiwifruit SVP2 gene represses growth and bud outgrowth by targeting genes involved in abscisic acid (ABA) and dehydration responses. This study reveals conserved mechanisms between kiwifruit and Arabidopsis SVP genes in plant growth regulation.
Area of Science:
- Plant Molecular Biology
- Genomics
- Developmental Biology
Background:
- Molecular mechanisms of growth and dormancy in woody perennials remain largely uncharacterized.
- The MADS-box transcription factor SHORT VEGETATIVE PHASE (SVP) is crucial for developmental transitions in Arabidopsis.
- SVP-like genes are implicated in dormancy control in woody plants.
Purpose of the Study:
- To investigate the role of SVP2 in kiwifruit (Actinidia chinensis) growth inhibition.
- To identify genome-wide direct targets of SVP2 in kiwifruit.
- To explore conserved mechanisms of SVP gene action between kiwifruit and Arabidopsis.
Main Methods:
- Chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-seq) was employed to identify SVP2 binding sites.
- Transcriptomic analysis was performed on transgenic kiwifruit lines overexpressing SVP2.
- Comparative analysis of SVP gene function across different plant species.
Main Results:
- SVP2 was found to bind to at least 297 sites in the kiwifruit genome.
- SVP2 potentially modulates 252 genes involved in meristem activity repression and abscisic acid (ABA)-mediated dehydration pathways.
- Overexpression of SVP2 in kiwifruit suppressed bud outgrowth, mimicking ABA effects.
Conclusions:
- Genome-wide targets of Actinidia chinensis SVP2 confirm its role in ABA- and dehydration-mediated growth repression.
- SVP2 plays a significant role in inhibiting growth and bud outgrowth in kiwifruit.
- A conserved mechanism of action exists between SVP genes in taxonomically distant species like kiwifruit and Arabidopsis.
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