朱唇种子吸水特性及其在干旱胁迫下萌发特性

种子粘液质是植物在长期适应环境过程中形成的,该物质对于种子的扩散、定居、生存力的改善、萌发、幼苗生存乃至抵御有毒化学物质毒害等都具有重要的生态学意义。朱唇为唇形科鼠尾草属多年生草本植物,原产美洲热带地区,现已广泛栽植于世界各地。为了理解朱唇种子表面的粘液物质吸水特性和种子在干旱胁迫下的萌发特性,该研究以朱唇种子为材料,运用光学显微镜和扫描电子显微镜观察以及种子萌发试验的方法,对种子和粘液层的形态结构、粘液质对种子萌发的影响进行了研究。结果表明：朱唇种子为卵形,表面为负网状结构,千粒重为（1.611±0.0084）g,无粘液种子吸水倍数为3,粘液种子吸水倍数为25,粘液层吸水倍数为122。粘液和...

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Bibliographic Details
Published in广西植物 Vol. 36; no. 4; pp. 430 - 434
Main Author 王涛 李文爽 刘世勇 李亚波 张利
Format Journal Article
LanguageChinese
Published 四川农业大学理学院,四川雅安,625014 2016
Subjects
朱唇
种子
粘液
萌发
germination
mucilage
seed
粘液
萌发
朱唇
种子
Salvia coccinea
Online AccessGet full text
ISSN1000-3142
DOI10.11931/guihaia.gxzw201407008

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Summary:种子粘液质是植物在长期适应环境过程中形成的,该物质对于种子的扩散、定居、生存力的改善、萌发、幼苗生存乃至抵御有毒化学物质毒害等都具有重要的生态学意义。朱唇为唇形科鼠尾草属多年生草本植物,原产美洲热带地区,现已广泛栽植于世界各地。为了理解朱唇种子表面的粘液物质吸水特性和种子在干旱胁迫下的萌发特性,该研究以朱唇种子为材料,运用光学显微镜和扫描电子显微镜观察以及种子萌发试验的方法,对种子和粘液层的形态结构、粘液质对种子萌发的影响进行了研究。结果表明：朱唇种子为卵形,表面为负网状结构,千粒重为（1.611±0.0084）g,无粘液种子吸水倍数为3,粘液种子吸水倍数为25,粘液层吸水倍数为122。粘液和无粘液种子及粘液层的重量都随吸水时间的延长而增长,但脱水过程要远长于吸水过程。朱唇种子吸水2 h达到饱和,经过36 h可干燥失水恢复原重。不同浓度PEG对朱唇种子的萌发均有影响,发芽势随PEG浓度升高而显著降低。朱唇种子在5%PEG胁迫下发芽率最高达（90.00±8.66）%,20%PEG胁迫下发芽率最低为（76.67±10.41）%,低浓度PEG对朱唇种子萌发有一定促进作用。这说明朱唇种子为速萌型种子,其粘液质在种子吸水过程中起到举足轻重的作用,能保证短时间内有充足的水分供其萌发。
Bibliography:Salvia coccinea; seed; mucilage; germination
Producing mucilage is a survival strategy of plants that formed in the long-term process of their environment adaptation,and the seeds producing mucilage are called mucilaginous seeds or mucus propagule. Studies show that mucilage has important ecological significance for the dispersal,settlement,viability improvement,germination,survival of seedlings and even the resistance toward the poisoning of toxic chemicals of seeds. Salvia coccinea is a perennial herb（ Lamiaceae： Salvia） originating in the tropical regions of the American continent. Due to its high medicinal and ornamental value,S. coccinea is widely cultivated throughout the world. In order to understand the water absorption properties of mucilage on the seeds of S. coccinea and germination characteristics of S. coccinea seed under drought stress. In the present study,seeds of S. coccinea were studied on the morphology and water absorption of seed coat mucilage and seed germination under the drought stress
ISSN:1000-3142
DOI:10.11931/guihaia.gxzw201407008