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題名:Anatomical characteristics of the secondary phloem in branches of Zelkova serrata Makino     (14點)
台灣櫸(Zelkova serrata Makino)側枝次生韌皮部的解剖特徵
著者:Ying-Shan Hsu(徐英珊) ;Shiang-Jiuun Chen(陳香君) ;Chin-Mei Lee(李金梅) ;Ling-Long Kuo-Huang(黃玲瓏)
出版地區:台灣
出版城市:台北市
學科:生命科學
關鍵字:側枝 ; 膠質纖維 ; 反應韌皮部 ; 次生韌皮部 ; 台灣櫸 ; Branches ; Gelatinous fibers ; Reaction phloem ; Secondary phloem ; Zelkova serrata
刊名:Botanical Bulletin of Academia Sinica
頁碼:143-149
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

對於傾斜的樹幹或側枝的反應材的性質和組織成份都被廣泛研究,但是相關反應於次生韌皮部的研究卻相當少也不完全。本研究針對台灣櫸枝條的上側與下側,就其對應之維管束形成層、木栓形成層和次生韌皮部的解剖特徵加以探討。台灣櫸枝條的維管束形成層最早形成於枝梢的第二個節間,在第三個節間即可觀察到木栓形成層出現於次表皮層,同時在其初生韌皮部外側的皮層組織亦首次觀察到約有二至四層成群存在的膠質纖維,膠質纖維在次生的木質部和韌皮部亦均可觀察到。台灣櫸枝條基部之次生生長呈現明顯的上側增生,因而形成偏心的構造,亦即形成位於上側的反應材與反應韌皮部。次生韌皮部具輸導功能的篩管和膠質纖維交互成層,以橫切面比較位於枝條上側的反應韌皮部與下側對應韌皮部,其厚度並沒有明顯的差別,然而卻發現上側的膠質纖維較早形成,有較多連續性的細胞層,而且面積比例也較大。此外,上側次生韌皮部的篩管細胞較長也較寬,在兩個篩管間具有的篩板亦較為水平排列,這些特徵可能意味著台灣櫸的枝條上側的次生韌皮部(反應韌皮部)具有較高的輸送效率。
The properties and tissue compositions of reaction wood in the leaning trunks or branches of trees have been extensively investigated, but studies on the influence of the related reaction on the secondary phloem are few and incomplete, in this work, formation of the vascular and cork cambium and the secondary phloem in the upper and lower sides of branches of Zelkova serrata Makino were studied. Vascular cambium is formed first in the second internode of shoot. In the third internode, cork cambium began to initiate subepidermally, meanwhile two to four layers of grouped gelatinous fibers were first found in the cortex outside of all the primary phloem. Gelatinous fibers were also found in both the secondary xylem and secondary phloem. The leaning branches exhibited pronounced radial secondary growth promotion to the upper side, and the reaction wood formed eccentrically. The secondary phloem formed layers of conducting sieve elements alternately with gelatinous fibers. Comparing the secondary phloem in the upper side (reaction phloem) of the branches with that in the lower side (opposite phloem), there is no obvious difference in thickness. Nevertheless, it was found that in the cross sections, the gelatinous fibers formed earlier, and there were more continuous cell senates and a much larger area ratio in the upper side. Besides, the sieve tubes in the upper side of secondary phloem were longer and wider and possessed a very horizontally-orientated sieve plate between two sieve elements. These features may imply that, in branches of Zelkova serrata, the secondary phloem of the upper side (reaction phloem) may have a higher translocation efficiency.


    

本卷期目次
Botanical Bulletin of Academia Sinica
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