Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/20859
標題: 大葉山欖、光臘樹、大葉楠對鹽霧逆境之生理反應
Physiological esponses of P. formosanum, F. formosana and M. kusanoi to Salty Smog Stress
作者: 林建宏
Lin, Chien-Horng
關鍵字: Salty Smog Stress;鹽霧
出版社: 植物學系
摘要: 
以三種鄉土綠化樹種:大葉山欖(Palaquium formosanum)、光臘樹(
Fraxinusformosana)及大葉楠(Machilus kusanoi)為材料,栽植於溫
室中,利用PVF(polyvinylformal)自動供水系統控制土壤水分含量為最
大含水量之50.4%、69.9%、88.8%,以人工海水定期均勻噴灑於葉片上
,並分析比較各樹種間的生理反應。由結果顯示,經鹽霧處理後,在生長
方面此三種樹種均被抑制,且以光臘樹受抑制的程度最大、大葉楠次之,
大葉山欖被抑制的程度最小。而在葉片水分含量、水分潛勢、滲透潛勢、
膨壓以及植株吸水變化量的分析中,同樣以光臘樹受害程度最大,且在鹽
霧處理期間,其葉片水分潛勢持續下降而無恢復情形、水分含量降低、吸
水量下降,此情形在大葉山欖和大葉楠的影響較小。而在葉片氣孔導度及
蒸散速率亦發現以光臘樹受抑制的情形最嚴重、大葉楠次之、大葉山欖影
響程度最小;至於光合作用方面,在葉片葉綠素含量變化在此三種樹種中
,經鹽霧處理均明顯下降,且光合作用在處理期間以光臘樹下降程度最大
,且Rubisco活性亦明顯被抑制、大葉楠亦有類似現象產生,但抑制程度
較輕、大葉山欖其處理組和控制組間則無顯著差異,由此顯示大葉山欖對
鹽霧逆境具較佳的耐受性;大葉楠雖對鹽霧逆境敏感,但短期處理仍可忍
受;光臘樹於處理期間則受鹽霧嚴重抑制;至於在滲透調節方面,此三種
樹種於處理期間均有可溶性醣及脯胺酸的累積,尤其是大葉山欖,於逆境
期間發現有大量甜菜素的累積,顯示此樹種對鹽霧的適應上,可有效累積
一些滲透性調節物質。由此顯示在鹽霧處理期間,大葉山欖能有效調整體
內碳氮組成,並合成累積一些保護物質,使其可於逆境下生存,而光臘樹
則對鹽霧逆境敏感,且在逆境期間其生理反應會被抑制,生長減緩;而大
葉楠在短期逆境下對鹽霧具有忍受性,然在處理後期仍呈現出傷害現象,
顯示長期生長於鹽霧下可能會對此種植物造成嚴重傷害。

Native seedlings of Palaquium formosanum, Fraxinus formosana and
Machiluskusanoi were grown in a greenhouse . The maximum soil
water contents were controlled to be 50.4%, 69.6% and 88.8% with
automatic watering system using polyvinylformal strips .
Periodically, artificial sea water was sprayed evenly on the
leaves. Several physiological responses of these seedlings to
salty smog was examined. The results showed that the growth of
all seedlings were inhibited by salty smog treatment. The
extent of growth inhibition was the highest in F. formosana and
the lowest in P. formosanum. The degree of inhibition in the
measurements of leaf water content, water potential, osmotic
potential, turgor pressure and absorption of water was also
the highest in F. formosana and the lowest in P. formosanum.
During salty smog treatment, the leaf water potential, water
content and absorption water of of F. formosana decreased
continously and was never recovered, whereas less severe
effects were found in P. formosanum and M.kusanoi . In analysis
of leaf stomatal conductance and transpiration,we also found
that all followed the same trends as the most serious inF.
formosana and the slightest in P. formosanum. As for
photosynthesis, chlorophyll contents in all seedlings were
decreased by salty smog treatment and the degree of decrease was
the highest in F. formosana during treatment. The activity of
Rubisco was also inhibited significantly in F. formosana. These
observations were similar to those of M. kusanoi but the effect
was less severe. There were no difference of Rubisco activity
between control and salty-smog treatment in P. formosanum. These
results showed that P. formosanum has higher tolerance to salty
smog. Although M. kusanoi are more sensitive to salty smog, it
still can tolerate for short term treatment. And F. formosana is
most affected by salty smog treatment. As for osmotic
regulation, all three species were accumulated soluble sugars
and proline. Betaine was also found to accumulate in P.
formosanum. These results showed that P. formosanum can
accumulate certain osmolytes for osmotic adjustment and protein
under environmental stresses. P. formosanum can also efficiently
regulate the content of carbon and nitrogen in order to
acclimate salty smog. F. formosana is sensitive to salty smog
and the expression of physiological responses are inhibited, and
growth is decreased during stress. M. kusanoi has mild-tolerance
to salty smog in short term exposure to salty smog, but still
develops inhibitory symptoms as stress persisted.
URI: http://hdl.handle.net/11455/20859
Appears in Collections:生命科學系所

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