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StCYP90C1 modulates plant architecture via regulating brassinosteroid biosynthesis in potato
Qi Fu1, Yanan Pu1,2, Jintao Liu1
1School of Life Sciences, Yunnan Key Laboratory of Potato Biology, Engineering Research Center for Valorization of Unique Bio-Resources in Yunnan, Ministry of Education, Yunnan Normal University, Southwest United Graduate School, Kunming, 650500, Yunnan Province, China.
A new study identifies a key gene, StCYP90C1, regulating brassinosteroid (BR) biosynthesis and potato plant architecture. Mutations in this gene cause abnormal plant growth, offering insights for potato breeding.
Area of Science:
- Plant Biology
- Genetics
- Molecular Biology
Background:
- Brassinosteroids (BRs) are vital plant hormones influencing plant architecture.
- The genetic basis of BR biosynthesis and its impact on potato architecture are not well understood.
Purpose of the Study:
- To identify the genetic variations controlling potato plant architecture.
- To elucidate the role of brassinosteroid biosynthesis in potato development.
Main Methods:
- Utilized a BC4S1 population to identify a recessive locus controlling abnormal plant architecture.
- Employed CRISPR/Cas9 gene editing to create StCYP90C1 knockout mutants.
- Performed gene expression analysis, BR intermediate quantification, and transcriptome analysis.
Main Results:
- Identified the StCYP90C1 gene (3-epi-6-deoxocathasterone 23-monooxygenase) at the abnormal plant architecture locus.
- Reduced StCYP90C1 expression, linked to promoter variations, caused dwarfism, curled leaves, and delayed flowering.
- StCYP90C1 knockout mutants exhibited significantly lower levels of BR intermediates (6-dexoCS and CS).
Conclusions:
- StCYP90C1 plays a critical role in potato plant architecture through brassinosteroid biosynthesis.
- Identified a deleterious mutation locus (ap) in StCYP90C1 that should be avoided in potato breeding programs.
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