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Lateral Root Inducible System in Arabidopsis and Maize

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Paclobutrazol Enhanced Stem Lodging Resistance of Direct-Seeded Rice by Affecting Basal Internode Development.

Weiyang Liu¹, Jiehao Cui¹, Cheng Ran^1,2

¹Agronomy College, Jilin Provincial Laboratory of Crop Germplasm Resources Jilin Agricultural University, Changchun 130118, China.

Plants (Basel, Switzerland)

|August 29, 2024

Summary

This summary is machine-generated.

Paclobutrazol application enhances direct-seeded rice (DSR) stem strength by altering hormones and cell wall components. This improves grain yield and reduces lodging, crucial for sustainable agriculture.

Keywords:

direct-seeded rice endogenous hormones lodging resistance paclobutrazol structural carbohydrate

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Area of Science:

Agricultural Science
Plant Physiology
Agronomy

Background:

Direct-seeded rice (DSR) often faces lodging issues, impacting yield.
Understanding stem mechanical strength is vital for improving DSR cultivation.
Paclobutrazol is a plant growth regulator with potential to mitigate lodging.

Purpose of the Study:

To investigate how paclobutrazol affects stem mechanical strength in DSR.
To explore the roles of endogenous hormones and cell wall components in this response.
To determine the optimal paclobutrazol concentrations for enhancing DSR lodging resistance.

Main Methods:

Field experiments using two japonica rice varieties (Jiyujing, Jijing305).
Seed soaking treatments with varying paclobutrazol concentrations (0-200 mg L⁻¹).
Analysis of endogenous hormones (IAA, GA₃, Z+ZR), cell wall components (cellulose, lignin), enzyme activities, gene expression, and mechanical properties (breaking strength, section modulus, bending stress).

Main Results:

Paclobutrazol application significantly increased grain yield and reduced lodging rate.
Shortened basal internodes due to decreased IAA and GA₃.
Enhanced stem mechanical strength (M) attributed to increased section modulus (SM) and bending stress (BS).
Increased culm diameter, wall thickness, and SM mediated by higher Z+ZR content.
Elevated cellulose and lignin content, lignin enzyme activity, and gene expression, contributing to higher BS and M.

Conclusions:

Paclobutrazol effectively improves DSR lodging resistance and grain yield.
The mechanism involves modulation of endogenous hormones and reinforcement of cell wall structure.
This study provides insights into optimizing paclobutrazol application for DSR cultivation.