The Influence of Thigmo-stimulation on Anatomical Traits and Biomechanical Properties of Bioenergy Sorghum Stems
The Influence of Thigmo-stimulation on Anatomical Traits and Biomechanical Properties of Bioenergy Sorghum Stems
复制标题
Thigmo刺激对生物能源高粱茎的解剖特性和生物力学特性的影响
DOI：
10.1016/j.jmbbm.2022.105090
复制
发表时间：
2022
影响因子：
3.9
通讯作者：
Omid Zargar, Qing Li
中科院分区：
文献类型：
--
作者：
Omid Zargar, Qing Li
二色Sorcium bicolor（L.）Moench]是一种热带草，可用作生物能源作物，但当暴露于诸如雨和风的机械刺激时，通常遭受茎结构破坏（倒伏）。机械刺激可以通过激活激素、蛋白质、转录因子和靶基因的调控网络来触发植物茎的适应性生长（触形态发生），这最终改变了它们的生理、形态和生物力学特性。本研究的目的是1）调查来自对照和机械刺激植物的节间的形态解剖生物力学特性的差异，以及2）检查这些变化是否也取决于刺激时的植物发育阶段。甜高粱栽培品种Della在温室中在两种生长条件下生长：有和没有机械刺激。机械刺激包括在七周的生长期内，在一个方向上周期性地弯曲茎。在成熟时，对刺激和非刺激股骨柄的解剖学特征进行表征，包括节间长度和直径，以及生物力学特性，包括弹性（瞬时）模量、弯曲刚度、强度和弯曲下的时间依赖性顺应性。研究了两个在机械刺激时处于不同发育阶段的茎节间的形态解剖学和生物力学特征。与较老的节间相比，较年轻的节间反应更灵敏，并且由于刺激而经历了更明显的长度变化。统计分析显示，刺激和非刺激股骨柄在解剖学和生物力学特性方面存在差异。机械刺激产生较短的节间，直径略大，以及更软（更顺应性）和更强的茎。
Sorghum [Sorghum bicolor (L.) Moench] is a tropical grass that can be used as a bioenergy crop but commonly suffers from stem structural failure (lodging) when exposed to mechanical stimuli, such as rain and wind. Mechanical stimulation can trigger adaptive growth in plant stems (thigmomorphogenesis) by activating regulatory networks of hormones, proteins, transcription factors, and targeted genes, which ultimately alters their physiology, morphology, and biomechanical properties. The goals of this study are 1) to investigate differences in the morpho-anatomical-biomechanical properties of internodes from control and mechanically-stimulated plants and 2) to examine whether the changes also depend on the plant developmental stages at the time of stimulation. The sweet sorghum cultivar Della was grown in a greenhouse under two growth conditions: with and without mechanical stimulation. The mechanical stimulation involved periodic bending of the stems in one direction during a seven-week growth period. At maturity, the anatomical traits of the stimulated and non-stimulated stems were characterized, including internode lengths and diameters, and biomechanical properties, including elastic (instantaneous) modulus, flexural stiffness, strength, and time-dependent compliance under bending. The morpho-anatomical and biomechanical characteristics of two internodes of the stems that were at different stages of development at the time of mechanical stimulation were examined. Younger internodes were more responsive and experienced more pronounced changes in length due to the stimulation when compared to the older internodes. Statistical analyses showed differences between the stimulated and non-stimulated stems in terms of both their anatomical and biomechanical properties. Mechanical stimulation produced shorter internodes with slightly larger diameters, as well as softer (more compliant) and stronger stems.