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Wheat TaSPL8 Modulates Leaf Angle Through Auxin and Brassinosteroid Signaling
Kaiye Liu1,2,3, Jie Cao1,2,3, Kuohai Yu1,2,3
1State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing, 100193, China.
Plant Physiology
|June 19, 2019
Summary
A wheat gene, TaSPL8, controls leaf angle by regulating lamina joint development. Its loss leads to erect leaves and improved architecture, offering a target for enhancing grass crop yields.
Area of Science:
- Plant Biology
- Genetics
- Agronomy
Background:
- Leaf angle in grass crops is crucial for architecture and yield, influenced by lamina joint development.
- A specific mutant with erect leaves was identified due to defects in this joint.
Purpose of the Study:
- To identify the gene responsible for the erect leaf phenotype in the identified mutant.
- To understand the role of this gene in plant architecture and yield improvement in grass species.
Main Methods:
- Map-based cloning to identify the mutated gene.
- Transcriptome analysis to investigate gene function.
- Promoter binding assays to confirm gene regulation.
Main Results:
- The gene TaSPL8 (SQUAMOSA PROMOTER BINDING-LIKE 8) was found to be deleted in the mutant.
- TaSPL8 knock-out mutants display erect leaves, compact architecture, and increased spike number.
- TaSPL8 activates genes in auxin and brassinosteroid pathways, essential for cell elongation and lamina joint development.
Conclusions:
- TaSPL8 plays a significant role in regulating lamina joint development in wheat.
- The D subgenome's TaSPL8 homeolog has a greater impact on lamina joint length.
- TaSPL8 represents a potential target for improving plant architecture and yield in grass crops.
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