干旱区生态环境知识资源中心(Arid): 红砂(Reaumuria soongarica)种子萌发特性及其局部适应性

Arid

	红砂(Reaumuria soongarica)种子萌发特性及其局部适应性
其他题名	Seed Germination Characteristics and Local Adaptation of Reaumuria soongarica
	石勇 1; 刘源 2; 殷恒霞 1; 燕霞 1; 马小飞 1
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2016
卷号	36 期号:3 页码:644-650
中文摘要	种子萌发特性是荒漠植物适应干旱的重要策略。红砂(Reaumuria soongarica)是典型耐旱植物,但目前缺乏从群体角度探讨其种子萌发特性和其局部适应性关系的报导。在25、4、-20、-40℃下,分别对来自于甘肃、宁夏和新疆的17个地区红砂种子进行发芽试验,检测不同群体在萌发时间、萌发率和发芽势上的差异,并用world-clim的气象数据分别对不同群体的萌发率和发芽势进行了相关性分析。结果表明:低温贮藏会削弱红砂种子的休眠、缩短红砂种子的初始萌发时间和萌发持续时间。经不同温度贮藏,红砂种子萌发率的变化不显著,其变化主要来自于不同群体间的差异,而且萌发率与其生存环境的温度和降水量显著相关。红砂种子的发芽势在-40℃温度贮藏后显著提升,呈现爆发型萌发,说明超低温储藏能极大消除红砂种子的生理休眠。此外,红砂种子的发芽势和环境温度显著相关。红砂种子的萌发特性表现出其对干旱生境的局部适应性,这一结果有助于深入理解荒漠植物对干旱环境的生态适应性机理,并为红砂在荒漠植被恢复中的推广提供理论和数据支撑。
英文摘要	Seed germination is critical for desert plants to adapt to drought,especially for Reaumuria soongarica, a constructive shrub species in temperate desert ecosystems.However,the relationship between seed germination and local adaptation from the perspective of populations are far from clear.R.soongarica seeds were sampled from17 geographical regions in Gansu,Ningxia or Xinjiang Provinces and stored at 4℃,25℃, -20℃or-40℃.Then germination were performed to fully investigated the variations on germination time,germination rate and germination energy.Moreover,correlation analyses were performed to assess the association between the world-clim data and germination rates or germination energy.The results showed that low temperature storage can weaken R.soongaricas seed dormancy and shorten the time to initial seed germination and the time for germination duration.Germination rate is not affected by storage temperature,but varies among populations of R.soongarica.Seed germination rates of different populations were significantly associated with temperature and precipitation of their original habitat.After storage at-40℃,R.soongaricas germination energy from all the populations significantly improved as an explosive way,suggesting that the physiological dormancy of the seeds of R.soongarica can be eliminated by the super low temperature storage. And the differentiation of germination energy among populations was significantly correlated with temperature of their original habitats.These seed germination characteristics of R.soongaricastrongly suggested they adapted locally to the heterogeneity conditions of diverse ecosystems.Our study sheds light on better understanding of ecological basis of desert plants to adapt to desert environments,and provides an empirical and theoretical supports for promoting R.soongarica in the restoration engineer of desert ecosystems.
中文关键词	红砂(Reaumuria soongarica) ; 荒漠植物 ; 群体 ; 种子萌发 ; 休眠 ; 萌发率 ; 发芽势 ; 遗传差异
英文关键词	Reaumuria soongarica desert plants populations seed germination dormancy germination rate germination energy genetic diversity
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:5743623
来源机构	中国科学院西北生态环境资源研究院 ; 甘肃农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235411
作者单位	1.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实验室, 兰州, 甘肃 730000, 中国; 2.甘肃农业大学生命科学技术学院, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	石勇,刘源,殷恒霞,等. 红砂(Reaumuria soongarica)种子萌发特性及其局部适应性[J]. 中国科学院西北生态环境资源研究院, 甘肃农业大学,2016,36(3):644-650.
APA	石勇,刘源,殷恒霞,燕霞,&马小飞.(2016).红砂(Reaumuria soongarica)种子萌发特性及其局部适应性.中国沙漠,36(3),644-650.
MLA	石勇,et al."红砂(Reaumuria soongarica)种子萌发特性及其局部适应性".中国沙漠 36.3(2016):644-650.