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Updated: Oct 19, 2025

Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

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Published on: November 9, 2012

Rice Lamina Joint Inclination Assay.

Hsing-Yi Li¹, Hsin-Mei Wang¹, Seonghoe Jang^1,2

¹Biotechnology Center in Southern Taiwan (BCST) of Agricultural Biotechnology Research Center (ABRC), Academia Sinica, Tainan, Taiwan.

|September 20, 2021

Summary

This summary is machine-generated.

Rice brassinosteroids (BRs) regulate lamina inclination. This study details a bioassay protocol showing the OsBUL1 knockout mutant rice (osbul1) exhibits reduced sensitivity to brassinolide (BL) in lamina joint inclination.

Keywords:

Bioassay Brassinosteroid Lamina inclination Lamina joint Rice

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Published on: September 14, 2011

Area of Science:

Plant biology
Plant hormones
Molecular genetics

Background:

Brassinosteroids (BRs) are crucial plant hormones regulating various growth processes, including rice lamina inclination.
The OsBUL1 gene is implicated in brassinosteroid signaling in rice, with its knockout mutant (osbul1) showing defects.

Purpose of the Study:

To establish a detailed bioassay protocol for assessing rice lamina joint inclination in response to exogenous brassinolide (BL).
To investigate and demonstrate the differential sensitivity of wild-type (WT) rice and the osbul1 mutant to BL treatment regarding lamina inclination.

Main Methods:

Detailed protocol for preparing rice samples for lamina joint inclination bioassays.
Methodology for exogenous application of brassinolide (BL) to rice samples.
Comparative analysis of lamina inclination in WT and osbul1 mutant rice under varying BL concentrations.

Main Results:

The study presents a reproducible protocol for rice lamina inclination bioassays.
The osbul1 mutant rice exhibits significantly less sensitivity to exogenous brassinolide (BL) compared to wild-type (WT) rice.
Quantitative data illustrates the dose-dependent effect of BL on lamina inclination in both genotypes.

Conclusions:

The developed protocol effectively quantifies brassinosteroid-induced lamina inclination in rice.
OsBUL1 plays a critical role in mediating brassinosteroid signaling for lamina inclination, as evidenced by the reduced sensitivity of the osbul1 mutant.
This research provides a valuable tool for studying brassinosteroid function in rice and other plant species.