| 红砂和珍珠对极端环境的生理响应与调节机制 |
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| 引用本文： | 周海燕,谭会娟,张志山,贾晓红,张景光,樊恒文.红砂和珍珠对极端环境的生理响应与调节机制[J].中国沙漠,2012,32(1):24-32. |
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| 作者姓名： | 周海燕 谭会娟 张志山 贾晓红 张景光 樊恒文 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所沙坡头沙漠试验研究站,甘肃兰州730000／中国科学院寒区旱区环境与工程研究所极端环境生物抗逆特性与生物技术实验室,甘肃兰州730000 |
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| 基金项目： | 国家自然科学基金项目，国家科技支撑项目 |
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| 摘 要： | 红砂和珍珠的生理生态特性随其生长的环境条件而变化；长期生长在一起的红砂和珍珠其生理生态特性具明显的差异,两者适应逆境的机制亦不相同。红砂和珍珠作为超旱生植物,其生理生态学特性明显区别于其他沙生植物；生长在山前地带的红砂和珍珠,可以在极低的水势条件下保证其生命活动,低的水势可能与渗透调节物质（如大量的脯氨酸）的存在有关,这类物质增加了植物的吸水能力；红砂和珍珠的光抑制程度较其他沙生植物要高得多,且光抑制的产生已对两种灌木光合色素产生了破坏,然而在条件稍好的早晚光抑制可得到恢复。
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| 关 键 词： | 红砂 珍珠 气体交换 水势 渗透调节 |
| 收稿时间： | 2011-04-06; |
Physiological Response and Adjustment Mechanism of Reaumuria soongorica and Salsola passerina to Extreme Environment |
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| ZHOU Hai-yan,TAN Hui-juan,ZHANG Zhi-shan,JIA Xiao-hong,ZHANG Jing-guang,FAN Heng-wen.Physiological Response and Adjustment Mechanism of Reaumuria soongorica and Salsola passerina to Extreme Environment[J].Journal of Desert Research,2012,32(1):24-32. |
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| Authors: | ZHOU Hai-yan TAN Hui-juan ZHANG Zhi-shan JIA Xiao-hong ZHANG Jing-guang FAN Heng-wen |
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| Institution: | 1,2(1.Shapotou Station of Desert Experimental Research,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China;2.Extreme Stress Resistance and Biotechnology Laboratory,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou 730000,China) |
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| Abstract: | Reaumuria soongorica and Salsola passerine have significant differences in ecophysiological characteristics,and they change with environmental variation although they live together for a long term.Their adaptive mechanisms to environmental stresses are very different.As two extreme xerophytes,Reaumuria soongorica and Salsola passerina differ significantly from other psammophytes in ecophysiological characteristics;they can survive in lower water potential,even grow in the piedmont area.Low water potential may be related to the existence of osmosis-regulating substance,such as proline,which can strengthen their water absorption capacity.Compared to other psammophytes,Reaumuria soongorica and Salsola passerina have higher degree of photo-inhibition under same condition,and photo-inhibition can lead to destruction of the photosynthetic pigment,nevertheless,the photo-inhibition can be repaired under suitable conditions in the morning and evening. |
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| Keywords: | Reaumuria soongorica Salsola passerine gas exchange water potential osmosis regulating |
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