干旱区生态环境知识资源中心(Arid): 盐胁迫下荒漠共生植物红砂与珍珠的根茎叶中离子吸收与分配特征

Arid

	盐胁迫下荒漠共生植物红砂与珍珠的根茎叶中离子吸收与分配特征
其他题名	Ion absorption and distribution of symbiotic Reaumuria soongorica and Salsola passerina seedlings under NaCI stress
	赵昕; 杨小菊; 石勇; 何明珠; 谭会娟; 李新荣
来源期刊	生态学报
ISSN	1000-0933
出版年	2014
卷号	34 期号:4 页码:963-972
中文摘要	西北荒漠地区C_3小灌木红砂(Reaumuria soongorica)和C_4半灌木珍珠猪毛菜(Salsola passerina)在特定环境下混生在一起,分布面积广阔。以采自腾格里沙漠边缘荒漠地带的天然野生珍珠猪毛菜和红砂群落的幼苗为材料,经0、100、200、300、400mmoI/L NaCI盐溶液共同胁迫10 d,检测它们的含水量、主要矿质离子在根茎叶的含量与分布,揭示二者耐盐的共生协同的离子平衡适应机制。试验结果发现,珍珠猪毛菜叶片具有吸钾排钠的的耐盐特征,红砂叶片具备吸钠排钾的特征,吸收利用无机矿质离子具备互补效应。二者耐盐Cl、Ca和Si离子吸收与累积能力存在很大差异:随着盐胁迫程度加剧,红砂的根茎叶中C1离子含量持续增加,并且为珍珠猪毛菜的25倍;珍珠猪毛菜根中Ca离子含量为红砂的23倍,但含量变化不显著;红砂根中Si离子含量迅速降低后稳定,并且是珍珠猪毛菜根的35倍,其他器官变化差异较小。因此,红砂与珍珠猪毛菜的共培养盐胁迫下根中吸收的离子侧重不同,红砂以Na、Cl、Si为主,珍珠猪毛菜以K、Ca为主。随着盐胁迫的程度加强,离子选择吸收系数S_(k,Na)的变化趋势降低,表明二者叶部对Na的选择性减小,K的选择性吸收积累增大,增强了它们的抗盐性,最终使叶片所受盐害减小。总之红砂与珍珠猪毛菜共生的耐盐离子稳态机制显著不同,离子吸收与分布具有互补互利的效应。
英文摘要	Wild C_3 plant Reaumuria soongorica and C_4 plant Salsola passerina coexist mutually in some desert habitats and form large-scale communities distributed in northwestern China. In this study we collected their seedlings from the edge of the Tengger desert. Their seedlings were subjected to salt stress together by soaked in 0,100,200, 300 to 400 mmol/L NaCI solutions for 10 d. We examined their water contents and main mineral ion contents changes in their roots, stems, and leaves during salt stress. The experiment results indicated that S. passerina absorbed K and inhibited Na in leaves to adapt to high salt stress as NaCI concentration increased. By on the contrary, R. soongorica absorbed Na and inhibited K. CI in its roots continuously increased two to five times higher than that in S. passerina’s roots. Ca content in S. passerina roots was two to three times higher than that in R. soongorica roots. Si content in R. soongorica roots was three to five times higher than that in S. passerina. Therefore, salt stress resistance in R. soongorica and S. passerina communities occurred via root absorption of different ions, and these ions were subsequently distributed to various organs. Based on salt ion selective absorption coefficient S _(Na(leaf/root)/K(leaf/root))ratio value, the two plants foliar selectivity increased K absorption and decreased Na absorption,thereby reducing salt damage on the leaves. Thus, these plants mutually benefit from each other and cooperate to promote their resistance to salt stress.
中文关键词	盐胁迫 ; 红砂 ; 珍珠猪毛菜 ; 离子 ; 吸收与分配
英文关键词	salt stress Reaumuria soongorica Salsola passerina ion absorption and distribution
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5087087
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231567
作者单位	沙坡头沙漠试验研究站,中国科学院寒区旱区环境与工程研究所, 甘肃省寒区旱区逆境生理生态重点实验室, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	赵昕,杨小菊,石勇,等. 盐胁迫下荒漠共生植物红砂与珍珠的根茎叶中离子吸收与分配特征[J]. 中国科学院西北生态环境资源研究院,2014,34(4):963-972.
APA	赵昕,杨小菊,石勇,何明珠,谭会娟,&李新荣.(2014).盐胁迫下荒漠共生植物红砂与珍珠的根茎叶中离子吸收与分配特征.生态学报,34(4),963-972.
MLA	赵昕,et al."盐胁迫下荒漠共生植物红砂与珍珠的根茎叶中离子吸收与分配特征".生态学报 34.4(2014):963-972.