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頁籤選單縮合
題名 | 離層酸在玉米幼苗生長中所扮演之角色(2)--離層酸對光合產物生成,轉運及利用之影響=Role of Abscisic Acid (ABA) in Seedling Growth of Corn Plants(Zea Mays L.)Ⅱ.Changes in Photosynthate Production, Translocation and Utilization |
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作者姓名(中文) | 王慶裕; 朱德民; | 書刊名 | 農林學報 |
卷期 | 45:1 1996.03[民85.03] |
頁次 | 頁73-82 |
分類號 | 434.147 |
關鍵詞 | 玉米; 幼苗; 離層酸; 生長; Abscisic acid; ABA; Corn; Maize; Seedling; Growth; |
語文 | 中文(Chinese) |
中文摘要 | 玉米臺農351號幼苗V4期在10�笐弸 ABA (abscisic acid)處理下,生長受到抑 制( Weed Sci. Bull. 15:159-168 )。 本試驗乃進一步研究發現玉米幼苗在 10 �笐� M ABA 處理後第一天第四葉之 CER ( carbondioxide exchange rate )即降至 76 %,而蒸 散作用更降至 61 %, 二者在三天內之變化趨勢相似, 顯示 ABA 控制氣孔行為嚴重影響 CER 的下降;此外,葉片單位葉綠素中 Rubisco 及 PEPCase 活性有明顯下降之現象,但因 ABA 處理下第四葉葉綠素有增加的現象,故整個葉片就單位鮮重而言二種酵素的活性變化不 大。 另一方面,從供源積儲觀點而言,在 10 �笐� M ABA 處理下供源葉片(完全展開葉) 之葡萄糖含量略有下降,蔗糖及澱粉含量未改變,sucrose phosphate synthase ( SPS ) 活性顯著下降,而且對�堞� - 蔗糖之吸收及轉運受阻,故推測 ABA 處理供源葉片除葡萄糖 合成略為減少外,蔗糖之吸收及轉運均受到抑制。同時發現積儲葉片(捲曲未展開之新生葉 )部位之蔗糖、澱粉含量未變而葡萄糖增加, 推測 ABA 處理下新生葉片之細胞葡萄糖可能 無法代謝利用而發生累積以致抑制其後之幼苗生長。 |
英文摘要 | Seedling growth of Zea mays L., cultivar Tainung 351 (TNG 351), was inhibited by 10 �笐� M ABA (abscisic acid) applied to roots at V4 satge (Weed Sci. Bull. 15: 195-168). But, how does the ABA inhibit seedling growth? More results in this study indicated the CER (carbon dioxide exchange rate) of the 4th leaf was declined to 76% at the first day after ABA treatment, and to 61% for transpiration rate simultaneously. It is obvious that reduction of CER was mainly controlled by stomatal behaviour. Biochemically, activities of both ribulose bicarboxyl-oxygenase (Rubisco) and phospho-enolpyruvate phosphorylase (PEPCase) were promoted significantly by ABA. However, relative increase of chlorophyll content in ABA-treated plants resulted in little changes in both enzyme activities. In a metabolic aspect, glucose content of source leaf (4th leaf, completely expanded leaf) was decreased slightly by ABA, but without any changes in sucrose and starch contents. In addition, due to the fact that a significant decrease of sucrose phophate synthase (SPS) activity, accompained with the inhibition of �� C-sucrose uptake and translocation, it is suggested that the net synthesis and translocation of sucrose within 3 days were all inhibited in source leaf. Within the sink leaf (newly-formed, the innerst rolling, unexpanding leaf), both sucrose and starch contents were not influenced by ABA, but the glucose content increased. It appears that accumulation of glucose in sink leaf was probably due to its poor utilization of photosynthates, which in ture resulted in subsequent seedling growth. |
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