| 王林权,邵明安.高等植物对钠离子的吸收、运输和累积[J].干旱地区农业研究,2005,(5):244~249 |
| 高等植物对钠离子的吸收、运输和累积 |
| The salt influx，transport and accumulation in higher plant |
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| DOI：10.7606/j.issn.1000-7601.2005.05.48 |
| 中文关键词: 钠离子 跨膜吸收 长距离运输 |
| 英文关键词:Na+ influx long distance transport |
| 基金项目:西北农林科技大学优秀人才专项基金资助(080807) |
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| 中文摘要: |
| 综述了植物对钠离子吸收、运输和累积等方面的最新研究进展。植物根系吸收钠离子的途径可能有三条,包括2条跨膜途径(钙敏感和非钙敏感两部分)和支流途径等。根系对钠离子的吸收可能是被动的,但排泄是主动的。木质部的装载可能是主动的,也可能是被动的。木质部的卸载过程还不清楚,可能是通过非选择性阳离子通道,或K+/Na+,Na+/H+反向运输体完成。Na+在植物体内运输需要特殊部位特殊细胞类型以协同方式运作。为了减少Na+通过木质部的质外体部分向地上部输送,根系靠外的部分细胞要减少流入,而内层细胞应该加大流入。我们需要了解更多的特殊细胞运输过程,和特殊细胞的载体及信号操作过程的知识。 |
| 英文摘要: |
| It is reviewed of new progresses of salt influx, transport and accumulation by higher plant. There are maybe three pathways for Na+ influx. Two protein-mediated pathways can be distinguished by their sensitivity to additional added Ca2+, and a third pathway appears to be due to "leakage" into the roots via the apoplast. It is clearly that initial entry of Na+ from soil solution into root is passive, and exclusion of Na+ from root is active. The xylem loading of Na+ may be active or passive. The mechanisms of Na+ removal from xylem sap are unknown. It may be through the non-selective cation channel, or K+/ Na+, Na+/H+ antiporter. Management of Na+ movement within plant requires special cell types in special locations within the plant catalyzing transport in a coordinated manner. To further understand complex, whole plant adaptation to salinity, we need to know more information about cell specific transport processes and consequences of the manipulation of transporters and signaling elements in special cell types. |
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