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請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/75037
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dc.contributor.authorShih-Pai Changen
dc.contributor.author張世白zh_TW
dc.date.accessioned2021-07-01T08:11:31Z-
dc.date.available2021-07-01T08:11:31Z-
dc.date.issued1999
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/75037-
dc.description.abstract本論文主要探討玉米葉片之澱粉水解?在老化過程中的變化。分別以整棵植株及初生葉為材料,發現隨著葉齡的增加,會有α-澱粉水解?活性上升及β-澱粉水解?活性下降的現象。利用西方免疫檢定,發現老化過程中β-澱粉水解?活性強度和其蛋白質分子的量成正相關,顯示酵素活性下降的原因是蛋白質的破壞,而不是失活(inactivation)所致。不論是植株葉片之自然老化或葉圓盤之人為老化的試驗結果,都指出α-澱粉水解?活性的上升或β-澱粉水解?活性的下降,皆與一般用做老化指標之可溶性蛋白質含量的變化,呈現高度的相關性;顯示澱粉水解?的活性變化可以做為玉米葉片老化之良好指標,β-澱粉水解?尤其適合。北方或條帶轉印之雜合反應的結果指出,只有在發育中之未完全展開的葉片內才有β-澱粉水解?mRNA的累積,葉片一旦展開之後,其mRNA量即逐漸下降;而當此mRNA下降之時,β-澱粉水解?的活性卻仍因其蛋白質量的增加而提高。葉片切離植物體後,其β-澱粉水解?活性的下降情形不因外加植物荷爾蒙Gibberellin、Zeatin或Abscisic acid而有所改變,但α-澱粉水解?活性則會受到ABA的促進,和蔗糖的抑制;由此推論,在玉米葉片老化過程中,β-澱粉水解?活性下降與α-澱粉水解?活性上升的現象,應是透過不同的調控機制。zh_TW
dc.description.abstractChanges of amylase activities in aging maize leaves were studied. The increase in α-amylase activity was accompanied with the decrease in β-amylase activity along the age gradient in a mature plant. Results from immunoblot analyses showed that β-amylase activity was closely correlated with the protein quantity of β-amylase during leaf senescence, and the decrease of β-amylase could be attributed to the protein degradation but not inactivation. No matter whole plant or leaf disc system was studied, leaf total soluble protein showed a highly positive correlation with β-amylase activity, and also a negative correlation with α-amylase activity during senescence. Therefore, changes in α- and β-amylase activities should be able to play a good index for leaf senescence just as total soluble protein content has been used. Based on RNA slot analysis, β-amylase mRNA was synthesized and accumulated when leaf expansion was in progress. Once the leaf reached full expansion, the β-amylase mRNA gradually decreased while the enzyme activity was still increasing owing to the protein synthesis and accumulation. In leaf disc system, the decrease of β-amylase activity during senescence could not be altered by adding phytohormones such as gibberellic acid, zeatin and abscisic acid. And α-amylase activity in leaf discs was enhanced by abscisic acid and repressed by sucrose. These results suggested that regulation of increasing α-amylase and decreasing β-amylase in senescing maize leaf might not share a common mechanism.en
dc.description.provenanceMade available in DSpace on 2021-07-01T08:11:31Z (GMT). No. of bitstreams: 0
Previous issue date: 1999
en
dc.description.tableofcontents中文摘要……………………………………………………i
英文摘要……………………………………………………ii
前言……………………………………………………1
材料與方法……………………………………………………6
結果……………………………………………………16
一、成熟葉片中之β-澱粉水解?……………………………………………………16
二、初生葉中之β-澱粉水解?……………………………………………………18
三、年輕植株葉片中的β-澱粉水解?……………………………………………………19
四、葉片之人工老化與澱粉水解?的變化……………………………………………………21
五、荷爾蒙及醣類對於葉片老化過程中澱粉水解?活性的影響……………………………………………………22
討論……………………………………………………24
參考文獻……………………………………………………30
圖表……………………………………………………37
dc.language.isozh-TW
dc.titleβ-澱粉水解?在玉米葉片老化過程之表現zh_TW
dc.titleExpression of β-Amylase in Senescing Maize Leafen
dc.date.schoolyear87-2
dc.description.degree碩士
dc.relation.page36
dc.rights.note未授權
dc.contributor.author-dept生命科學院zh_TW
dc.contributor.author-dept植物科學研究所zh_TW
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