請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76272
標題: | 鎘在百日草植株中的分佈及對植株形態和生理的影響 Cadmium distribution and its effects on morphology and physiology in Zinnia elegans |
作者: | Wei-ting Chen 陳維婷 |
出版年 : | 1997 |
學位: | 碩士 |
摘要: | 百日草對鎘相當敏感,3 μM硝酸鎘處理就會造成毒害,鎘害主要造成根部生長受阻,地上部明顯矮化,新葉黃化,老葉出現褐色壞疽,並提早老化。隨處理濃度的增加,鎘害的程度越嚴重,表現鎘害的時間也越短。 超微構造顯示葉綠體受害最明顯,葉綠餅間層(intergranal thylakoid)膨脹鬆散,類囊體疊膜層數減少,並且有內膜膨大的現象,油滴(plastoglobuli)數目增加。莖部維管束薄壁細胞中葉綠體受害情況較不明顯。以鎘處理的植物細胞幾乎都在液胞內有電子密集物質產生的現象,但是細胞壁的色澤與對照組相差不多,在莖部的導管旁的薄壁細胞有特化成Transfer cell的情形,但是在葉及根部的木質部卻沒有觀察到這種現象。 鎘主要累積在根部,其次為莖,葉的單位乾重鎘累積量最少。越接近根部的節間,鎘累積量越高,而葉子則相反。超氧岐化酵素,過氧化氫酵素及酸性磷酸酵素三者之同功?之類型與活性,隨鎘處理的時間而有所改變。 Cadmium toxicity was reflected on morphological and biological change. The major morphological abnormalities of cadmium-treated plants were the retardation of plant growth, chlorosis of leaves (especially young leaves), and earlier senescence of old leaves. Cadmium affected plants showed that chloroplast abnormalities in mesophyll of leaf, such as the swelling and looseness of grana, and reduction of stack disc of thylakoid in grana. But the effects of cadmium on chloroplasts in vascular bundles of stems were not so prominent. Transfer cells were not only found in phloem tissues and minor veins of vascular bundles, they were also found in xylem tissues near by vessels in stems of cadmium-treated plants. However, they were not found in roots and leaves of cadmium-treated plants. The distribution of cadmium was mainly in root. The accumulation of cadmium in stems was higher than that in leaves. Cadmium accumulation ability of young leaves was much higher than that of older leaves. The isozyme patterns of superoxide dismutase, peroxidase and acid phosphatase were also altered by the duration of cadmium treatment. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/76272 |
全文授權: | 未授權 |
顯示於系所單位: | 植物科學研究所 |
文件中的檔案:
沒有與此文件相關的檔案。
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。