盐胁迫下大白菜吸收转运45Ca2+的变化 |
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引用本文: | 缪颖,蒋有条,曾广文,朱祝军. 盐胁迫下大白菜吸收转运45Ca2+的变化[J]. 核农学报, 1996, 10(3): 0-0 |
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作者姓名: | 缪颖 蒋有条 曾广文 朱祝军 |
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摘 要: | 在5mScm^-1和10mScm^-1NaCl胁迫过程中,大白菜幼苗根系膜透性、TTC还原能力和丙二醛含量的变化显示根受到不同程度伤害。盐腔迫处理下,根系对钙的吸收速率在〔Ca^2+〕〉0.75mmol/L时明显受到抑制。根系对^45Ca^2+的积累能力分别在5mScm^-1NaCl胁迫5h生10mScm^-1NaCl胁迫3h后受到抑制,而且大白菜各器官(根、茎、叶)对^45Ca^2+的吸收、转运
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关 键 词: | 盐胁迫 大白菜 钙吸收 钙转运 |
收稿时间: | 2009-12-31 |
修稿时间: | 2009-12-31 |
CHANGES OF 45 Ca 2+ UPTAKE AND TRANSLOCATION IN CHINESE CABBAGE ( Brassica pekinensis) AT SALT STRESS |
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Abstract: | Seedlings of Chinese cabbage were grown in the greenhouse at 0,5 and 10 mS/cm NaCl. Membrane leakage,TTC reduction activity and MDA content of the roots were determined from one hour to ten hours after treatment as the index of root injury. Ca 2+ uptake rate as a function of external [Ca 2+ ]at 5 mS/cm and 10 mS/cm NaCl was much lower than that of control when the external Ca 2+ was more than 0.75 mmol/L. 45 Ca 2+ uptake was significantly inhibited 3 hours after exposed to 10 mS/cm and 5 hours after exposed to 5 mS/cm,respectively. Distribution of 45 Ca 2+ in roots,stems and leaves reveals that young leaves are the most sensitive part to salt stress in terms of the absorption of Ca 2+ , thus Ca deficiency occurs in young leaf margin when exposed to salt stress. |
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Keywords: | Salt st ress calcium uptake t ranslocation Chinese cabbage |
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