Effect of gravitational stimulus duration on tension wood formation in young stems of poplar (P-euramericana ev 'Ghoy').
Effect of gravitational stimulus duration on tension wood formation in young stems of poplar (P-euramericana ev 'Ghoy').
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DOI：
10.1051/forest:2002071
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发表时间：
2003-01-01
影响因子：
3
通讯作者：
Avella-Shaw, T
中科院分区：
文献类型：
--
作者：
Jourez, B;Avella-Shaw, T
以白杨Ghoy为试材，采用人工倾斜的方法，在生长期内诱导产生张力和对生木组织，作为对重力刺激的反应。根据正常生长季节的规模，芽能够对极短的刺激做出反应。在仅仅6小时的展示时间之后，整个枝条呈现出相反的木弧。然而，在上表面，需要24到48小时的时间，让枝条感觉到它们的平衡状态的改变，并开始产生张力木材。在48小时的潜伏期后，在茎的上表面可以观察到凝胶状纤维的形成。刺激持续时间的增加影响了受拉木材的胶质纤维数量和弧角。在下面，相反的木纤维以较慢的速度产生，导致髓偏心。在接受约4至8天的刺激后，芽将恢复直立位置。
Young shoots of Poplar Ghoy have been inclined artificially during increasing periods to induce the formation of tension and opposite wood tissues as reaction to the gravitational stimulus. The shoots are able to react to an extremely short stimulus according to the scale of the normal growing season. After a presentation time of only 6 hours, the whole of the shoots present an opposite wood arc. However, on the upper face, it takes between 24 and 48 hours, for the shoots to feel the modification of their equilibrium state and start producing tension wood. After 48 hours of latent period, formation of gelatinous fibres can be observed on the upper face of the stem. The increase duration of the stimulus influences the quantity of gelatinous fibres and the arc angle of the tension wood. On the lower face, the opposite wood fibres are produced at a slower rate, causing a pith eccentricity. The shoots will return to the stand-up position after being submitted to a stimulus of approximately 4 to 8 days.