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題 名 | Correlations Between Calcium Oxalate Crystals and Photosynthetic Activities in Palisade Cells of Shade-adapted Peperomia Glabella=耐陰植物玲瓏椒草 (Peperomia Glabella) 之柵狀葉肉細胞內的草酸鈣晶體與光合作用力的相關性 |
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作 者 | 黃玲瓏; 古森本; | 書刊名 | Botanical Studies |
卷 期 | 48:2 2007.04[民96.04] |
頁 次 | 頁155-164 |
分類號 | 373.141 |
關鍵詞 | 草酸鈣; 晶體; 椒草; 光合作用; 耐陰植物; Calcium oxalate; Crystals; Peperomia; Photosynthesis; Shade plants; |
語 文 | 英文(English) |
中文摘要 | 耐陰植物玲瓏椒草(Peperomia glabella)每個柵狀光合葉肉細胞內均具有一個晶簇狀的草酸鈣晶體,我們假設其與光線的散射到葉綠體有關。本研究針對光線強度對晶體之大小、個數與位置,以及相對於植株生長與光合作用的效應加以測試。玲瓏椒草最適宜生長的光強度為50-100 µE m¯²s¯¹,而在300-400 µE m¯²s¯¹光強度生長的植株則葉子較小且有明顯黃化的現象。植株生長於光強度較弱的環境下可生成正常的葉綠體,然而在300-400 µE m¯²s¯¹光強度生長的植株生成的葉綠體則會累積葉綠體油滴且呈現類囊膜膨脹的現象。隨著光線強度的增加,則葉綠素含量、葉綠素a與b的比、以及光合作用率則隨之降低。在所有之測試的光強度下,柵狀葉肉細胞內均會產生晶簇狀的草酸鈣晶體,但所形成晶體的直徑並不相同,在100 µE m¯²s¯¹光強度下其直徑最大,而在光線較強時,晶體的直徑則減小。晶體在柵狀光合葉肉細胞內的相關位置亦隨著光強度而改變,在50與100 µE m¯²s¯¹的光強度下,晶體在柵狀細胞內的位置主要位於細胞的基部或是細胞的中央部位,然而在300與400 µE m¯²s¯¹的光強度下,晶體在細胞內的位置則明顯的主要位於細胞的頂部。本研究結果顯示玲瓏椒草葉片之光合作用的進行,其柵狀細胞內的草酸鈣晶體扮演著相對的適應性。 |
英文摘要 | Each photosynthetic palisade cell in the leaves of shade-adapted Peperomia glabella contains a druse calcium oxalate crystal which we hypothesize is involved in dispersing light to the chloroplasts. The effect of light intensity on druse size, number and position, relative to growth and phototsynthesis was determined. Peperomia glabella grew best at 50-100µE m¯²s¯¹, and at 300-400 µE m¯²s¯¹ had smaller leaves with considerable yellowing. Plants grown under lower light had well developed chloroplasts while at 300-400 µE m¯²s¯¹ the chloroplasts accumulated plastoglobuli and showed thylakoid swelling. Chlorophyll content, chlorophyll a/b, and photosynthetic rate decreased with increasing light intensity. Druse crystals were produced in palisade cells under all light conditions but crystal diameter changed, being greatest at 100 µE m¯²s¯¹ and decreasing with higher light. The position of the crystals also changed with light intensity. Under 50 and 100 µE m¯²s¯¹ the crystals were predominantly located at the bottom or middle of cells while at 300 and 400 µE m¯²s¯¹ they were at the top of cells. The data indicate an adaptive role of calcium oxalate crystals in photosynthesis in Peperomia. |
本系統中英文摘要資訊取自各篇刊載內容。