Rice THIN CULM 4 (TC4) modulates culm strength by regulating morphology, structure, and development.

Area of Science:

• Plant Biology
• Genetics
• Agricultural Science

Background:

• Culm strength is vital for rice (Oryza sativa) lodging resistance and stable yield.
• Understanding the genetic basis of culm development is essential for improving crop resilience.

Purpose of the Study:

• To identify and characterize the gene responsible for the thin culm phenotype in the rice mutant tc4.
• To elucidate the function of the TC4 gene in rice culm development and mechanical strength.

Main Methods:

• Map-based cloning was employed to isolate the candidate gene TC4.
• Complementation and CRISPR/Cas9 gene editing were used to validate the function of TC4.
• Subcellular localization and physiological analyses were performed.

Main Results:

• A single nucleotide substitution in the TC4 gene was identified as the cause of the thin and brittle culm phenotype.
• TC4, a homolog of FLORICAULA/LEAFY, localizes to the nucleus and cytoplasm.
• TC4 influences plant hormone levels and sugar transport, affecting culm development.

Conclusions:

• The study identified TC4 as a key regulator of rice culm strength and development.
• Understanding TC4's role provides insights for breeding lodging-resistant rice varieties.
• This research contributes to the genetic understanding of structural integrity in crop plants.