干旱区生态环境知识资源中心(Arid): 干旱胁迫下白刺花种子大小与萌发对策

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	干旱胁迫下白刺花种子大小与萌发对策
其他题名	Seed size and germination strategy of Sophora davidii under drought stress
	王慧慧 1; 王普昶 2; 赵钢 1; 孙秋 3; 龙忠富 2; 张瑜 2
来源期刊	生态学报
ISSN	1000-0933
出版年	2016
卷号	36 期号:2 页码:335-341
中文摘要	种子大小与种子萌发及其与环境因子的关系是植物种子萌发对策研究中的重要科学问题之一。采用PEG模拟干旱法研究不同干旱胁迫强度(0,5%,10%,15%,20%)下,白刺花(Sophoradavidii)种子萌发进程、种子大小与种子萌发及种子命运的关系。结果表明:不同干旱胁迫下,白刺花种子具有相似的萌发进程,但中度干旱处理(10% PEG)萌发率显著高于零干旱(0% PEG)和重度干旱处理(P<0.05),重度干旱处理(20% PEG)种子萌发开始时间晚于零干旱和中度干旱处理;种子大小与种子萌发开始时间的关系表现为零干旱处理下呈极显著负线性关系,中度干旱处理(5% PEG, 10% PEG)下无相关关系,重度干旱处理(15% PEG,20% PEG)下呈负二次曲线关系;种子大小对种子命运的影响表现为零干旱处理有利于大、小种子萌发和小种子休眠,中度干旱处理(10% PEG)增加中等种子萌发、大种子休眠和小种子死亡风险,重度干旱处理(15% PEG,20% PEG)增加大种子死亡风险、中等种子和小种子休眠。综合分析表明,白刺花种子大小与萌发行为及种子命运的关系具有较强的环境依赖性,即种子萌发行为表现为顺境下种子越大萌发越快,逆境下小种子和大种子较中等种子萌发更快;种子命运表现为顺境增加种子死亡的风险,中度干扰有利于种子萌发,逆境则有利于种子休眠。
英文摘要	Sophora davidii is an important leguminous shrub that is widely used for revegetating areas experiencing karst rocky desertification in southwest China. Karst is a fragile environment that is very sensitive to environmental and climate change,and is often under considerable drought stress. Seed size is a prominent life history trait of plants. Experiments were conducted in the laboratory to evaluate the effect of osmotic potential and seed size on germination,dormancy and mortality. The effect of drought stress on seed germination was examined by using different concentrations of polyethylene glycol treatments (0, 5%,10%,15%,and 20%) to provide designated osmotic potentials. The results showed that S. davidii seeds had a similar germination process under different degrees of drought stress. Seed germination percentage under moderate drought stress (10% PEG) was significantly higher than under non-stress and severe stress treatment (P < 0.05). The initiation of seed germination under severe drought stress (20% PEG) was slower than under non-stress and moderate stress. Seed size had a significant negative linear correlation with the initiation time for seed germination under non-stress treatment and a negative curve correlation for treatments under severe stress treatments (15% PEG, 20% PEG),while there was no correlation for moderate drought stress (5% PEG, 10% PEG). The relationship between seed size and seed fate of S. davidii showed that non-stress conditions may beneficial to germination for large or small seeds and dormancy for small seeds; moderate drought stress can drive medium seed germination,large seed dormancy and small seed mortality, and severe drought stress (15% PEG,20% PEG) can lead to large seed mortality, and medium and small seed dormancy. Seed size, germination behavior and seed fate were heavily dependent on environmental factors. The germination strategy had a diverse pattern,that is,the larger seed size,the earlier seeds germination; in non-stress conditions,but larger and smaller seeds germinate earlier than medium seeds in adversity. The seed fate of S. davidii showed that seed mortality increased in non-stress conditions, seed germination was facilitated under moderate stress,and that seed dormancy was expedited in adversity. The information in this study may help land managers develop effective and sustainable revegetation management strategies.
中文关键词	白刺花 ; 种子大小 ; 种子萌发对策 ; 干旱胁迫强度
英文关键词	Sophora davidii seed size seed germination strategies drought stress
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:5618678
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234743
作者单位	1.仲恺农业工程学院, 广州, 广东 510225, 中国; 2.贵州省草业研究所, 贵阳, 贵州 550006, 中国; 3.贵州省现代农业发展研究所, 贵阳, 贵州 550006, 中国
推荐引用方式 GB/T 7714	王慧慧,王普昶,赵钢,等. 干旱胁迫下白刺花种子大小与萌发对策[J],2016,36(2):335-341.
APA	王慧慧,王普昶,赵钢,孙秋,龙忠富,&张瑜.(2016).干旱胁迫下白刺花种子大小与萌发对策.生态学报,36(2),335-341.
MLA	王慧慧,et al."干旱胁迫下白刺花种子大小与萌发对策".生态学报 36.2(2016):335-341.