Thickness-stiffness trade-off improves lodging resistance in rice
Satoru Tsugawa1, Hiroyuki Shima2, Yukitaka Ishimoto3
1Department of Mechanical Engineering, Faculty of Systems Science and Technology, Akita Prefectural University, Yurihonjo, Akita, 015-0055, Japan. tsugawa@akita-pu.ac.jp.
Scientific Reports
|July 4, 2023
Summary
Lodging resistance in rice (Oryza sativa L.) is crucial for yield. This study reveals a thickness-stiffness trade-off in rice culms, identifying ear weight and upper internode morphology as key to reducing deflection and improving lodging resistance.
Area of Science:
- Agricultural Science
- Plant Biology
- Biomechanics
Background:
- Crop lodging significantly impacts grain yield and quality, necessitating enhanced lodging resistance in breeding programs.
- Understanding lodging resistance in rice (Oryza sativa L.) cultivars and its relationship with culm properties is essential.
- The interplay between morphological and mechanical properties of rice culms requires further investigation.
Purpose of the Study:
- To investigate the morphological and mechanical properties of rice culms across different cultivars.
- To explore the relationship between culm thickness, stiffness, and lodging resistance.
- To develop a mechanical model for predicting rice culm deflection under self-weight load.
Main Methods:
- Evaluated morphological and mechanical properties of culms from 12 rice cultivars, considering different internodes.
- Characterized cultivars into 'thickness-type' (thicker, softer culms) and 'stiffness-type' (thinner, stiffer culms).
- Developed a mechanical model to analyze constraints on rice culms under self-weight loading.
Main Results:
- Identified a significant thickness-stiffness trade-off in rice culm properties among cultivars.
- Discovered that ear weight and the morphology of the highest internode are critical for minimizing culm deflection.
- The mechanical model successfully dissected the factors influencing culm deflection.
Conclusions:
- Ear weight and upper internode morphology are key factors for enhancing lodging resistance in rice.
- The developed mechanical theory can predict rice culm deflection, aiding in breeding for improved lodging resistance.
- This study offers novel mechanics-based breeding strategies for developing lodging-resistant rice cultivars.
More Related Videos
Related Concept Videos
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
296
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
296
01:08Bending of Members Made of Several Materials
228
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
228
01:18Residual Stresses in Bending
211
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
211
01:23Poisson's Ratio
499
Poisson's ratio is a material property that indicates their stress response. It explains the connection between the elongation or compression a material undergoes in the direction of an applied force and the contraction or expansion it experiences perpendicular to that force. When a slender bar is loaded axially, it stretches in the direction of the force and contracts laterally. Poisson's ratio is the negative ratio of this lateral contraction to the axial elongation. The negative sign...
499
01:25Yield Criteria for Ductile Materials under Plane Stress
190
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
190
01:24Stress-Strain Diagram - Ductile Materials
859
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
859