TaCIPK19-3D Improves Photosynthetic Machinery, Growth, Yield, and Salt Tolerance in Transgenic Rice

Area of Science:

• Plant Molecular Biology
• Crop Physiology
• Biochemistry

Background:

• Calcineurin B-like interacting protein kinases (CIPKs) regulate plant development and stress responses.
• The specific functions of many CIPK members in crops like wheat and rice are not well understood.

Purpose of the Study:

• To characterize the function of wheat TaCIPK19-3D in rice.
• To investigate its role in plant growth, photosynthesis, ion homeostasis, and stress tolerance.

Main Methods:

• Overexpression of TaCIPK19-3D in transgenic rice.
• CRISPR-Cas9-mediated knockout of oscipk19 in rice.
• Expression profiling and subcellular localization.
• Physiological measurements (chlorophyll, photosynthesis, ion content).
• Yeast two-hybrid and bimolecular fluorescence complementation (BiFC) assays for protein interactions.

Main Results:

• TaCIPK19-3D is localized in chloroplasts and involved in chloroplast development.
• Overexpression lines showed enhanced photosynthesis, chlorophyll content, ion homeostasis (K⁺/Na⁺, Ca²⁺, Mg²⁺), and improved growth and yield.
• TaCIPK19-3D overexpression increased salt tolerance via ABA signaling, antioxidant, and proline biosynthesis pathways.
• Key genes for chlorophyll synthesis and salt stress response were upregulated.
• TaCIPK19-3D interacts with TaFBA-4D and CBL proteins (TaCBL1, TaCBL3, TaCBL4, TaCBL7).

Conclusions:

• TaCIPK19-3D positively regulates photosynthesis, ion homeostasis, and stress signaling.
• It plays a crucial role in improving crop productivity and stress resilience.
• This gene holds potential for enhancing wheat and rice crops.