Loss of CsCLV2 function causes dwarfism and determinates growth in cucumber

Area of Science:

• Plant genetics
• Molecular biology
• Crop science

Background:

• Cucumber (Cucumis sativus L.) is a vital global vegetable crop.
• Optimizing plant architecture is crucial for yield and cultivation efficiency.
• Understanding genetic control of plant height is essential for breeding.

Purpose of the Study:

• Identify the genetic basis of a novel cucumber dwarf mutant (csdw3).
• Determine the role of CsCLV2 in regulating cucumber plant height.
• Investigate the molecular mechanism underlying CsCLV2 function.

Main Methods:

• Genetic analysis and fine-mapping to locate the causal gene.
• CRISPR-Cas9 gene editing to create loss-of-function mutants.
• Histological examination of shoot apical meristem development.
• Protein interaction assays to study gene function.

Main Results:

• A single recessive gene controls the dwarf phenotype.
• A 102 bp deletion in CsCLV2 was identified as the causal mutation.
• CsCLV2 disruption leads to premature SAM termination, reducing plant height.
• CsCLV2 interacts with CsCIK1 in the CLV-WUS pathway.

Conclusions:

• CsCLV2 is a critical regulator of cucumber plant height.
• The CsCLV2-CsCIK1 interaction maintains meristem activity.
• Findings provide valuable genetic resources for breeding improved cucumber ideotypes.