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Related Experiment Video

Updated: Jun 16, 2026

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice (Oryza sativa ssp.)

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Biomass accumulation and energy conversion efficiency in aromatic rice genotypes.

S M Shahidullah¹, M M Hanafi, M Ashrafuzzaman

¹Institute of Tropical Agriculture, University Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia. shahidullah4567@yahoo.com

Comptes Rendus Biologies

|February 24, 2010

Summary

This study evaluated aromatic rice genotypes, finding that net assimilation rate (NAR) significantly impacts energy use efficiency (Emu). Higher NAR at the heading stage is key for improving rice yield and photosynthetic performance.

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Area of Science:

Agricultural Science
Plant Physiology
Crop Science

Background:

Aromatic rice quality is influenced by genetic and environmental factors.
Optimizing photosynthetic efficiency is crucial for enhancing crop yield.

Purpose of the Study:

To assess variations in growth parameters and photosynthetic efficiency among aromatic rice genotypes.
To identify key factors influencing energy use efficiency (Emu) in rice.

Main Methods:

Field experiment conducted on forty aromatic rice genotypes and three non-aromatic checks.
Evaluation of leaf area index (LAI), crop growth rate (CGR), net assimilation rate (NAR), and energy use efficiency (Emu) at different growth stages.
Statistical analysis including correlation and path analysis.

Main Results:

Significant variations observed in LAI, CGR, NAR, grain yield, total dry matter (TDM), and Emu among genotypes.
Energy use efficiency (Emu) ranged from 0.58% to 1.65%, positively correlating with TDM, CGR, and grain yield.
Net assimilation rate (NAR) at the heading stage showed the highest positive direct effect (0.70) on Emu.

Conclusions:

NAR is a critical determinant of photosynthetic efficiency and energy use in aromatic rice.
Genotype selection based on NAR and other growth parameters can improve rice productivity.
Understanding these relationships aids in developing high-yielding aromatic rice varieties.