干旱区生态环境知识资源中心(Arid): 温度和渗透胁迫对细叶鸦葱种子萌发的影响

Arid

	温度和渗透胁迫对细叶鸦葱种子萌发的影响
其他题名	The Effects of Temperature and Osmotic Stress on the Germination of Scorzonera pusilla （ Compositae ） Seeds
	田美华 1; 唐安军 1; 宋松泉 2
ISSN	0253-2700
出版年	2007
卷号	29 期号:6 页码:682-686
中文摘要	多年生早春短命植物细叶鸦葱（Scorzonera pusilla）种子小而轻，吸水性强，非休眠。对其进行变温和渗透胁迫实验，结果为：细叶鸦葱种子的适宜萌发温度介于0～15℃，以4℃为最佳；变温对种子萌发无明显的促进作用。种子萌发率随PEG和NaCl溶液水势的降低而降低，与渗透胁迫程度呈负相关。而且，在渗透胁迫下，幼苗脯氨酸含量随胁迫程度的增强而增加。尽管温度不同，但是等渗的NaCl溶液对细叶鸦葱种子及其幼苗的胁迫程度大于PEG溶液，且表现出明显的离子毒害效应。结果对阐明荒漠区早春短命植物的生态地理格局及其干旱适应机制有着重要的理论意义。
英文摘要	Scorzonera pusilla is one of the early-spring short-lived perennial desert plants. Non-dormant seeds of S.pusilla are very small and hght, and able to absorb water very quickly. Suitable temperature for germination was between 0℃ and 15℃, and the optimum temperature was 4℃. With the increasing temperature, the germination percentage decreased evidently. Especially, temperature fluctuations had not significant effect on seed germination. Final germination percentages decreased distinctly with decreasing water potential of PEG and NaCl solution. The relationship between water potential of different solutions and germination was negative. The stronger the osmotic stress was, the more the praline content of seedlings was. The effects of NaCl on germination and seedlings were much stronger than that of iso-osmotic PEG in spite of two different temperatures, and the proline content of seedlings confronting increasing water stress was increased sharply. When the concentration of NaCl increased to some extent, the salt toxicity occurred besides water stress. The results are valuable to elucidate the ecogeographical patterns and mechanisms for adaptation of such early-spring ephemeral plants in the desert environments.
中文关键词	细叶鸦葱 ; 干旱适应机制 ; 种子 ; 渗透胁迫 ; 离子毒害效应 ; 脯氨酸
英文关键词	Scorzonera pusilla Drought-adaptive strategy Seed Osmotic stress Salt toxicity Prohne
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3042309
来源机构	中国科学院植物研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/221706
作者单位	1.中国科学院西双版纳热带植物园, 昆明, 云南 650223, 中国; 2.中国科学院植物研究所, 北京 100093, 中国
推荐引用方式 GB/T 7714	田美华,唐安军,宋松泉. 温度和渗透胁迫对细叶鸦葱种子萌发的影响[J]. 中国科学院植物研究所,2007,29(6):682-686.
APA	田美华,唐安军,&宋松泉.(2007).温度和渗透胁迫对细叶鸦葱种子萌发的影响.,29(6),682-686.
MLA	田美华,et al."温度和渗透胁迫对细叶鸦葱种子萌发的影响".29.6(2007):682-686.