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題 名 | 二氧化硫短期燻氣對十七種樹苗葉部傷害及生理活性之影響=Effects of Short-term Fumigation with Sulfur Dioxide on Foliar Injury and Physiological Activities in Seedlings of Seventeen Tree Species |
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作 者 | 郭耀綸; 陳家儀; 李芳胤; 仲崇毅; | 書刊名 | 作物、環境與生物資訊 |
卷 期 | 5:2 2008.06[民97.06] |
頁 次 | 頁113-126 |
分類號 | 436.253 |
關鍵詞 | 葉綠素螢光值; 葉部傷害徵狀; 燻氣; 淨光合作用率; 二氧化硫敏感性; Chlorophyll fluorescence; Foliar injury symptoms; Fumigation; Net photosynthesis; So₂ susceptibility; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究分別以濃度600、1,000及2,000 ppb的二氧化硫將17種樹苗燻氣48小時,測定各樹苗葉部傷害徵狀及生理活性之反應,供評估各種樹苗對SO₂的敏感性。經600 ppb之二氧化硫短期燻氣後,所有樹苗葉部均未出現徵狀,葉綠素螢光反應Fv/Fm值只有2種樹苗降至0.75以下,但已有16種的淨光合作用率顯著低於燻氣處理前。經1,000 ppb之二氧化硫處理後,大多數樹苗葉部皆出現紅褐色斑塊受害徵狀,苦楝及臺灣欒樹則出現灰白色斑塊。在該濃度處理已有12種樹苗的Fv/Fm值降至0.75以下,鳳凰木及大花紫薇之數值甚至低於0.1,此兩樹種及苦楝、稜果榕的光合作用率亦僅為燻氣前的4~13%,顯示這4種樹苗的生理活性已遭嚴重抑制。經2,000 ppb之二氧化硫燻氣後,鳳凰木、大花紫薇及烏心石受害嚴重致全株落葉,其餘樹苗雖未落葉但葉部均顯現不等程度的受害徵狀。在此處理下所有17種樹苗的淨光合作用率、氣孔導度及Fv/Fm值均顯著降低,但仍有10種樹苗的葉綠素濃度指標值在處理前後無顯著差異,顯示二氧化硫對某些樹種葉綠素的傷害程度不高。供試樹種中楓香、竹柏、黃心柿、黃連木、欖仁、香楠及臺灣樹蘭等7種對二氧化硫的耐受性較高,而鳳凰木與大花紫薇的耐受性最低,對二氧化硫極為敏感。本研究也發現淨光合作用率可敏銳的反應不同種樹苗對二氧化硫的敏感性。 |
英文摘要 | Seedlings of seventeen tree species were fumigated with 600, 1,000, and 2,000 ppb of sulfur dioxide (SO₂), respectively, for 48 hours. Foliar injury symptoms and several physiological activities of each species were measured for determining the susceptibility to SO₂. After being fumigated with 600 ppb of SO₂ no foliar injury symptoms occurred for al species. However, chlorophyll fluorescence (Fv/Fm ratio) of two species reduced to below 7.5 and net photosynthetic rates of sixteen species decreased significantly. When increasing SO₂ concentration to 1,000 ppb, reddish-brown interveinal chlorosis was observed in most species and white or ashen chlorosis shown in Melia azedarach and Koelreuteria henryi. Under this treatment, Fv/Fm ratio of twelve species reduced to below 7.5 and all seventeen species showed significant reduction in the net photosynthetic rates. The Fv/Fm ratio of both Delonix regia and Lagerstroemia speciosa were below 0.1. In addition, their net photosynthetic rates and those of M. azedarach and K. henryi were all reduced to 1-13% of before fumigation, indicating that the physiological activities of these four species were greatly inhibited. When fumigated with 2,000 ppb of SO₂, leaves of D. regia, L. speciosa and Michelia compressa were severely injured and all fell off, while leaves of the other ourteen species did not fall off but all showed various degrees of foliar injury. In this study, net photosynthetic rates, stomatal conductance, and the Fv/Fm ratio of all species were significantly reduced. However, the chlorophyll concentrations of ten species were not significantly reduced after treatment, indicating that SO₂ did not severely injure the foliar chlorophyll of these species. Results showed that Liquidambar formosana, Nageia nagi, Diospyros maritime, Pistacia chinensis, Terminalia catappa, Machilus zuihoensis, and Aglaia formosana were the most tolerant species to SO₂. On the other hand, D. regia and L. speciosa were very susceptible to short-term fumigation with SO₂. Photosynthetic rates of all species were found very sensitive to SO₂ treatment. Therefore, it can serve as a physiological indicator of susceptibility in seeding of tree species to SO₂ stress. |
本系統中英文摘要資訊取自各篇刊載內容。