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Rice putative methyltransferase gene OsTSD2 is required for root development involving pectin modification
Lianghuan Qu1, Chunyan Wu2, Fei Zhang2
1National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan 430070, China College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
Journal of Experimental Botany
|August 7, 2016
Summary
The OsTSD2 gene in rice is crucial for root development, impacting cell adhesion and elongation. Its mutation affects pectin modification, leading to significant root growth abnormalities.
Area of Science:
- Plant Biology
- Molecular Genetics
- Biochemistry
Background:
- Pectin synthesis and modification are essential for plant development but remain poorly understood.
- The OsTSD2 gene encodes a putative methyltransferase involved in rice (Oryza sativa) growth.
Purpose of the Study:
- To functionally characterize the OsTSD2 gene in rice.
- To elucidate the role of OsTSD2 in root development and pectin modification.
Main Methods:
- Analysis of T-DNA insertion mutants of OsTSD2.
- Immunofluorescence staining (LM19) and Ruthenium Red staining of roots.
- Biochemical analysis of cell wall pectin polysaccharides.
- Measurement of endogenous abscisic acid (ABA) and indole-3-acetic acid (IAA) content.
Main Results:
- OsTSD2 mutants exhibited dwarf phenotypes and altered root zoning (meristematic, elongation, mature zones).
- Mutations led to abnormal cellular adhesion, aerenchyma formation, inhibited root elongation, and increased lateral root density.
- Increased unesterified homogalacturonan (HG) and decreased pectin monosaccharide composition and uronic acid content were observed in mutants.
- Mutants showed increased ABA content, suggesting a role in ABA and IAA signaling pathways.
Conclusions:
- OsTSD2 is essential for rice root development, regulating pectin synthesis and modification.
- The OsTSD2 gene likely functions via a pathway involving pectin methylesterification, influencing cell adhesion and elongation in a zone-dependent manner.
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