干旱区生态环境知识资源中心(Arid): 多裂骆驼蓬种皮纹饰和粘液的解剖结构特征及其对种子扩散和萌发的影响

Arid

	多裂骆驼蓬种皮纹饰和粘液的解剖结构特征及其对种子扩散和萌发的影响
其他题名	Anatomic Structure of Seed Coat Ornamentation and Mucilage of Peganum multisectum and Its Ecological Adaptation to Seeds Dispersal and Germination
	陈晓翠 1; 陆嘉惠 2; 陈超南 1; 韩春 1; 宋凤 1; 牛清东 1
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2016
卷号	36 期号:5 页码:930-937
中文摘要	利用体视显微镜和扫描电子显微镜观察了荒漠植物多裂骆驼蓬粘液质种皮吸水前后的形态变化,通过种子吸水-脱水、粘土、漂浮和萌发实验研究了种皮纹饰和粘液特征在种子扩散和萌发中的适应意义,以期为研究该物种在荒漠环境中的适应策略提供理论依据。结果表明:(1)多裂骆驼蓬种皮纹饰由表皮细胞外切向壁的附属物向外突起形成,呈多面体网纹状;种皮纹饰上覆盖1层粘液薄膜,将多面体网眼围成封闭的腔,种子吸水后粘液薄膜变成凝胶状,腔内有气泡产生;粘液薄膜经过反复吸水-脱水后逐渐溶解消失。(2)种皮网眼状腔室结构和粘液薄膜可使种皮纹饰内储存空气,以增强种子的漂浮能力,有助于种子扩散;种皮纹饰和粘液还增强了种子的粘土能力,使种子锚定在土壤表面,避免种子裸露和活力丧失;此外,种皮纹饰及粘液的快速吸水和保水能力能防止种子失水,有效维持该物种在荒漠环境中的土壤种子库。(3)种皮纹饰和粘液虽可抑制种子萌发,但能促进幼根的伸长生长,对增强幼苗的建植能力有一定积极作用。
英文摘要	The characteristic changes of mucilaginous seed coat before and after wetting were observed by dissecting microscope and scanning electron microscopy.The effects of seed coat ornamentation and mucilage on water uptake,sand adhesion,floatability and germination of seeds were analyzed.The result showed that:(1)The seed coat ornamentation of Peganum multisectum was formed by outward protruding appendages on the outer periclinal walls of epidermal cells and presented a reticular structure.Pellicles covered on the polyhedral meshes of seed coat ornamentation,making the meshes form closed chambers. After absorbing water,the pellicles became mucilaginous and a lot of bubbles appeared in the mucilage chambers.The mucilage was gradually dissolved and disappeared after water absorption-dehydration. (2)The mucilage layer and chambers of seed can store much air,which facilitated seed floatation on moving water and further dispersal.Meanwhile,seed coat ornamentation and mucilage can enhance adhesive ability of seed to the soil and other plants,thereby escaping from seeds bareness to maintain seed vigor.The seed coat ornamentation and mucilage also can absorb a large amount of water quickly and hold water,thus maintaining soil seed bank in the harsh desert.(3)The mucilaginous seed coat can delay germination but promote seedlings growth in an unpredictable environment,which increasing the ability of plant establishment.
中文关键词	种皮粘液 ; 种子扩散 ; 种子萌发
英文关键词	seed coat mucilage seeds dispersal seeds germination
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:5731171
来源机构	石河子大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235154
作者单位	1.石河子大学生命科学学院, 石河子, 新疆 832003, 中国; 2.石河子大学生命科学学院, 新疆兵团绿洲生态农业重点实验室, 石河子, 新疆 832003, 中国
推荐引用方式 GB/T 7714	陈晓翠,陆嘉惠,陈超南,等. 多裂骆驼蓬种皮纹饰和粘液的解剖结构特征及其对种子扩散和萌发的影响[J]. 石河子大学,2016,36(5):930-937.
APA	陈晓翠,陆嘉惠,陈超南,韩春,宋凤,&牛清东.(2016).多裂骆驼蓬种皮纹饰和粘液的解剖结构特征及其对种子扩散和萌发的影响.西北植物学报,36(5),930-937.
MLA	陈晓翠,et al."多裂骆驼蓬种皮纹饰和粘液的解剖结构特征及其对种子扩散和萌发的影响".西北植物学报 36.5(2016):930-937.