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題 名 | Roles of Ammonium Stress, Cytokinin and Phosphinothricin (PPT) in the Induction of Rice (Oryza Sativa) Microshoots=銨逆境、細胞分裂素與Phosphinothricin (PPT)在誘導水稻微芽產生時所扮演之角色 |
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作 者 | 王智屏; 周煒裕; 王慶裕; | 書刊名 | 植物保護學會會刊 |
卷 期 | 47:4 民94.12 |
頁 次 | 頁349-360 |
分類號 | 434.111 |
關鍵詞 | 水稻; 微芽; 硫酸銨; 細胞分裂素; 過氧化酶; PPT; Rice; Microshoot; Phosphinothricin; Ammonium sulfate; Cytokinin; Peroxidase; |
語 文 | 英文(English) |
中文摘要 | 本試驗主要探討 phosphinothricin ( PPT )誘導產生之銨逆境與細胞分裂素( cytokinin )在 PPT 促進水稻微芽產生 (21) 過程中之角色。本試驗在水稻芽體培養第一階段以高濃度 100 mM 硫酸銨處理,配合第二階段以 50 mM 硫酸銨處理,產生之微芽數較多,且外加 benzyladenine ( BA )明顯促進微芽產生之效果。根據解剖觀察結果確定,銨逆境些微增加側芽數,而外加 BA 則使銨逆境所誘導之側芽數明顯增加。因此,推測高濃度銨逆境可能抑制主芽生長,減少頂芽優勢,而間接促使側芽或始原體增加,但處於銨逆境下,即使有始原體產生,仍不利於後續生長,而外加 BA 可能促使已形成之始原體生長,進而產生微芽。於第二階段 BA 處理後 10 天過氧化酶活性顯著增加,推測 BA 可能透過過氧化酶活性之增加而誘導微芽之後續生長。此外發現在銨逆境下,外加 BA 使 glutamine 、 glutamate 與 glycine 含量依序逐漸增加,推測 BA 有助於恢復銨逆境下, GS/GOGAT 路徑之正常運作,以提供胺基酸供生長之用。 |
英文摘要 | The roles of both ammonium stress and cytokinin effect, played in the microshoot induction of rice by phosphinothricin (PPT)(1) have been studied. More microshoots were produced by the treatment combination of 100 mM ammonium sulfate applied at stage I and 50 mM at stage II of in vitro culture of rice buds, and this effect was significantly enhanced by benzyladenine (BA). Anatomical study indicated that the number of lateral buds was slightly increased under the high ammonium stress, and it was largely increased when coupled with BA treatment. This suggests that the primordia of lateral buds were induced by ammonium through the interruption of apical dominance. But the subsequent growth was possibly hampered by the high ammonium concentration in tissues, unless this effect was overcome by BA. The large increase of peroxidase activity, an indicator of cell division, in apical dome of microshoot 10 days after BA treatment, might support the subsequent growth of lateral buds. In addition, the successive increase of three key amino acids in glutamine synthetase/glutamate synthase (GS/GOGAT; EC 1.4.1.3) pathway, i.e., glutamine, glutamate and glycine, by BA, might be advantageous to the recovery of microshoot growth hampered by ammonium stress. |
本系統中英文摘要資訊取自各篇刊載內容。