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Biochemical and Transcriptome Analyses Reveal a Stronger Capacity for Photosynthate Accumulation in Low-Tillering

Mingqiang Zhu¹, Shan Jiang¹, Jinqiu Huang¹

¹State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China.

International Journal of Molecular Sciences

|February 10, 2024

Summary

Low-tillering rice varieties exhibit enhanced carbon metabolism and greater storage of non-structural carbohydrates (NSC) and starch in sheaths. This supports larger panicle development, crucial for high-yield rice breeding.

Keywords:

DEGs WGCNA carbon and nitrogen metabolism rice (Oryza sativa L.)tillering transcriptome

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Area of Science:

Plant Science
Agricultural Science
Genetics

Background:

Optimizing rice tillering and panicle size is key for high-yield rice breeding.
Understanding the physiological and metabolic differences between low- and multi-tillering varieties is essential.

Purpose of the Study:

To investigate the physiological and metabolic mechanisms underlying tillering regulation in rice.
To identify factors contributing to larger panicle development in low-tillering rice varieties.

Main Methods:

Comparative analysis of low- and multi-tillering rice varieties.
Measurement of biomass, non-structural carbohydrate (NSC), and starch content.
Analysis of carbon and nitrogen metabolism.
Gene expression profiling.

Main Results:

Low-tillering rice showed earlier tillering cessation, larger sixth leaf area, and significantly higher single-culm biomass.
Increased non-structural carbohydrate (NSC) and starch accumulation in sheaths of low-tillering varieties.
Low-tillering varieties exhibited stronger carbon metabolism, while multi-tillering varieties showed stronger nitrogen metabolism.
Gene expression analysis revealed enrichment in carbohydrate synthesis pathways for low-tillering types and nitrogen metabolism for multi-tillering types.

Conclusions:

Low-tillering rice varieties possess a superior capacity for storing photosynthetic products as starch, promoting larger panicle development.
Differential carbon and nitrogen metabolism activities regulate tillering and panicle development.
Findings offer insights into rice tillering regulation and guide the development of ideal plant types for high-yield breeding.