TISSUE STRESSES IN ORGANS OF HERBACEOUS PLANTS .2. DETERMINATION IN 3 DIMENSIONS IN THE HYPOCOTYL OF SUNFLOWER
TISSUE STRESSES IN ORGANS OF HERBACEOUS PLANTS .2. DETERMINATION IN 3 DIMENSIONS IN THE HYPOCOTYL OF SUNFLOWER
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DOI：
10.1093/jxb/46.8.1045
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发表时间：
1995-08-01
影响因子：
6.9
通讯作者：
SIEVERS, A
中科院分区：
文献类型：
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作者：
HEJNOWICZ, Z;SIEVERS, A
利用泊松比和(1)将外组织条重新拉伸到原位初始长度所需的力的测量数据，对向日葵下胚轴的组织应力（TSs）和应力本身所涉及的纵向和横向力进行了测定；（ii）外部压缩力和（iii）防止浸在水或甘露醇溶液中孤立的内部组织（IT）扩展所需的外部渗透压。这三个独立的测量给出了相似的纵向力（OT的拉伸，IT的压缩）的大小，在根尖区域为0.37 N。超过80%的拉伸力由表皮传递，导致纵向TS比这一层的膨压压力高3倍，IT层的纵向压缩TS约为该组织膨压压力的三分之一，OT和IT层的横向TS由纵向力计算。在OT中，拉伸的周向TS是纵向TS的五分之一到六分之一。在IT中，横向压缩TS约为纵向压缩TS的一半。
The longitudinal and transverse forces involved in tissue stresses (TSs) and the stresses themselves, were determined for the hypocotyl of Helianthus annuus L., using Poisson ratios and data from measurements of (i) the forces necessary to restretch the strips of outer tissue (OT) to their initial length in situ; (ii) the external compressive force and (iii) the external osmotic pressure required to prevent the extension of isolated inner tissue (IT) immersed in water or mannitol solutions. These three independent measurements gave a similar magnitude for the longitudinal forces (tensile in the OT, compressive in the IT), 0.37 N in the apical region. More than 80% of the tensile force is transmitted by the epidermis, resulting in a longitudinal TS three times higher than that due to turgor pressure in this layer, The longitudinal compressive TS in the IT amounts to approximately one-third of turgor pressure in this tissue, Transverse TSs in the OT and in the IT were calculated from the longitudinal forces. In the OT, the tensile, circumferential TS is one-fifth to one-sixth of that in the longitudinal direction. In the IT the compressive TS in the transverse direction amounts to nearly half of that in the longitudinal direction.