干旱区生态环境知识资源中心(Arid): 古尔班通古特沙漠钠猪毛菜种子异型性及其萌发行为研究

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	古尔班通古特沙漠钠猪毛菜种子异型性及其萌发行为研究
其他题名	Seed polymorphism and germination behavior of Salsola nitrariain the Gurbantunggut Desert
	王梦茹; 魏岩
来源期刊	草业学报
ISSN	1004-5759
出版年	2019
卷号	28 期号:3 页码:85-92
中文摘要	钠猪毛菜在我国仅分布在新疆,具有很强的抗干旱和抗盐碱能力。研究钠猪毛菜不同类型种子形态及其萌发特性,结果表明,钠猪毛菜产生3种类型的种子,其形态特征、萌发特性均有显著差异。A型种子绿色,圆形,着生方式为横生,直径为(1.2940.089)mm,百粒重(90.710.42)mg,花被背部有翅状附属物;B型种子红色,圆形,着生方式为直立,直径为(1.1660.069)mm,百粒重(85.520.49)mg,花被背部有短/无翅状附属物;C型种子黄色,圆形,着生方式为直立,直径为(1.0440.062)mm,百粒重(83.840.31)mg,花被背部无翅状附属物。A型种子在5℃/15℃、10℃/20℃、15℃/25℃、20℃/30℃、25℃/35℃(光/暗=12h/12h)变温条件下萌发率均>92%,B型种子在5种变温条件下萌发率<60%,为非深度生理休眠,低温层积2周后可打破休眠;C型种子在5种变温条件下萌发率<5.3%,为深度生理休眠,划破种皮可打破休眠。浓度低于0.2mol·L~(-1)的NaCl溶液对A型种子萌发的影响不大,但从0.8mol·L~(-1)起,萌发率随着浓度增高而降低,直至为零,将在0.05~4.00mol·L~(-1) NaCl溶液中处理的A型种子转移至蒸馏水后,仍有一定的恢复萌发率。苞片延缓A型种子吸胀,影响种子的最终萌发率,去除苞片可显著提高种子的萌发率。通过研究钠猪毛菜种子异型性及其萌发行为,为揭示其生态适应机制提供科学依据,并为新疆荒漠地区生态建设提供基础资料。
英文摘要	Salsola nitraria has a strong drought and salt-tolerance capacity in Xinjiang desert.Experiments were conducted to study the seed polymorphism and germination of S.nitraria.It produces three types of fruits that differ markedly in morphological characteristics and germination.Type A fruits are green and spherical and have winged perianth;Type B fruits are red and spherical,the perianth is without wings;Type C fruits are yellow and spherical,the perianth is without wings.Seeds were germinated in incubators at 5℃/15℃,10 ℃/20℃,15℃/25℃,20℃/30℃,and 25℃/35℃ (12hdark/12hlight)for 14d.Germination percentages of type A seeds under all five temperature regimes were>92%;germination percentages of type B seeds under all five temperature regimes were<60%;germination percentages of type C seeds at all five temperature regimes were<5.3%.Type B seeds have no-deep physiological dormancy and seeds require 2weeks of cold stratification to germinate.Type C seeds have deep physiological dormancy and scarification was an effective means of breaking the seed dormancy.Germination of type A seeds was not affected by NaCl at concentrations below 0.2mol·L~(-1),but was decreased by NaCl at higher concentrations,and fell to nearly zero at concentrations above 0.8mol·L~(-1).Seeds incubated in NaCl at concentrations of 0.05-4.0mol·L~(-1) recovered after being transferred to distilled water.Bracts of type A seeds formed a mechanical barrier to water uptake,and had a significant influence on the final seed germination percentages.Removal of bracts promoted seed germination.Further research into seed polymorphism in S.nitraria and the associated germination differences may reveal its ecological adaptive mechanism and provide data for ecological construction in the Xinjiang desert.
中文关键词	种子异型性 ; 钠猪毛菜 ; 温度 ; NaCl溶液 ; 苞片
英文关键词	seed polymorphism Salsola nitraria temperature NaCl bracts
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:6450612
来源机构	新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238973
作者单位	新疆农业大学草业与环境科学学院, 新疆草地资源与生态重点实验室, 乌鲁木齐, 新疆 830052, 中国
推荐引用方式 GB/T 7714	王梦茹,魏岩. 古尔班通古特沙漠钠猪毛菜种子异型性及其萌发行为研究[J]. 新疆农业大学,2019,28(3):85-92.
APA	王梦茹,&魏岩.(2019).古尔班通古特沙漠钠猪毛菜种子异型性及其萌发行为研究.草业学报,28(3),85-92.
MLA	王梦茹,et al."古尔班通古特沙漠钠猪毛菜种子异型性及其萌发行为研究".草业学报 28.3(2019):85-92.