干旱区生态环境知识资源中心(Arid): Secondary-cell-wall release: a particular pattern of secretion in the mucilaginous seed coat of Magonia pubescens

Arid

DOI	10.1002/ajb2.1415
	Secondary-cell-wall release: a particular pattern of secretion in the mucilaginous seed coat of Magonia pubescens
	Souza, Michely de Jesus 1; Mercadante-Simoes, Maria Olivia 1; Ribeiro, Leonardo Monteiro 2
通讯作者	Mercadante-Simoes, Maria Olivia
来源期刊	AMERICAN JOURNAL OF BOTANY
ISSN	0002-9122
EISSN	1537-2197
出版年	2020
卷号	107 期号:1 页码:31-44
英文摘要	Premise Plant mucilages are composed of strongly hydrophilic polysaccharides and contribute to seed germination and seedling establishment. The myxospermic seeds of Magonia pubescens, a Cerrado (neotropical savanna) tree species, produces a voluminous mucilage capsule when hydrated. The development of the mucilaginous layer, the process of mucilage secretion and its role in seed germination was not previously studied so far. Methods Morphological, anatomical, histochemical, and ultrastructural evaluations of the seed coat during seed development were undertaken. The formation of the mucilage capsule was followed using scanning electron microscopy, and the coat's effects on seed hydration and germination were evaluated after experimental manipulation of the seed coat. Results The mucilaginous layer is contained in the outer coat of the seed. The mucilage-secreting cells accumulate proteins in the outer periclinal region and acidic polysaccharides in the inner periclinal region of the periplasmic space. Neutral polysaccharides, which form the loosely organized secondary wall, form a folding, basket-like structure surrounding the acidic polysaccharides. The protoplast collapses at maturity. With hydration, the mucilage expands, breaks the epidermal layer, and forms a mucilage capsule around the seed. The mucilaginous seed coat does not increase the germination rate. Conclusions Upon mucilage hydration, the secondary cell walls forming the network of neutral polysaccharides are released, along with proteins, and help retain the acidic polysaccharides-forming a peculiar architecture that imparts integrity and consistency to the mucilage capsule. As winged seeds are not usually buried, the mucilage capsule favors seedling hydration, contributing to its establishment on the soil surface.
英文关键词	columella germination mucilaginous seed coat plant mucilage Sapindaceae secondary cellulosic cell wall seed imbibition seed ontogenesis
类型	Article
语种	英语
国家	Brazil
收录类别	SCI-E
WOS记录号	WOS:000506129100001
WOS关键词	ARABIDOPSIS-THALIANA ; CELLULOSE SYNTHASES ; GERMINATION ; DESERT ; DIFFERENTIATION ; BRASSICACEAE ; ACHENES ; FRUIT ; STAIN ; LEAD
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
EI主题词	2020-01-08
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312410
作者单位	1.Univ Estadual Montes Claros, Dept Gen Biol, Lab Plant Anat, BR-39401089 Montes Claros, MG, Brazil; 2.Univ Estadual Montes Claros, Dept Gen Biol, Lab Micropropagat, BR-39401089 Montes Claros, MG, Brazil
推荐引用方式 GB/T 7714	Souza, Michely de Jesus,Mercadante-Simoes, Maria Olivia,Ribeiro, Leonardo Monteiro. Secondary-cell-wall release: a particular pattern of secretion in the mucilaginous seed coat of Magonia pubescens[J],2020,107(1):31-44.
APA	Souza, Michely de Jesus,Mercadante-Simoes, Maria Olivia,&Ribeiro, Leonardo Monteiro.(2020).Secondary-cell-wall release: a particular pattern of secretion in the mucilaginous seed coat of Magonia pubescens.AMERICAN JOURNAL OF BOTANY,107(1),31-44.
MLA	Souza, Michely de Jesus,et al."Secondary-cell-wall release: a particular pattern of secretion in the mucilaginous seed coat of Magonia pubescens".AMERICAN JOURNAL OF BOTANY 107.1(2020):31-44.