遮荫植物对茎弯曲的触变形态发生及生物力学响应
Thigmomorphogenesis and biomechanical responses of shade-grown plants to stem flexure.
作者信息
Marler Thomas E
机构信息
a Western Pacific Tropical Research Center , University of Guam, UOG Station , Mangilao , USA.
出版信息
Plant Signal Behav. 2019;14(7):1601953. doi: 10.1080/15592324.2019.1601953. Epub 2019 Apr 15.
The influences of stem flexure on shade-grown Merr. stem growth and strength were determined in a container nursery setting. Treated stems were bent 90° two times daily for a 14 wk nursery production period. Plant height, internode length, and slenderness were decreased by stem flexure when compared with control plants that received no flexure. Two force-displacement tests revealed stem strength was increased by the flexure treatment. Control plants exhibited undesirable lean of the main stem, and 1 hr of wind stress further increased the angle of lean. Treated plants were close to orthotropic and the wind stress did not change the stem lean. Results indicate stem flexure is a reliable method for increasing the quality of shade-grown plants and some form of mechanical stimulation should be added to nursery production protocols for the species.
在容器苗圃环境中确定了茎弯曲对阴生梅里尔茎生长和强度的影响。在为期14周的苗圃生产期内，对处理过的茎每天弯曲两次，每次弯曲90°。与未进行弯曲处理的对照植株相比，茎弯曲使株高、节间长度和茎细长比降低。两次力-位移测试表明，弯曲处理提高了茎的强度。对照植株主茎出现了不理想的倾斜，1小时的风应力进一步增大了倾斜角度。经过处理的植株接近垂直生长，风应力并未改变茎的倾斜度。结果表明，茎弯曲是提高阴生植物质量的可靠方法，该物种的苗圃生产规程中应增加某种形式的机械刺激。
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