Megagametophyte development in Hordeum vulgare. 1. Early megagametogenesis and the nature of cell wall formation

1985 ◽  
Vol 63 (12) ◽  
pp. 2164-2171 ◽  
Author(s):  
D. D. Cass ◽  
D. J. Peteya ◽  
B. L. Robertson
Keyword(s):  
Cell Wall ◽  
Hordeum Vulgare ◽  
Embryo Sac ◽  
Cell Wall Formation ◽  
Wall Formation ◽  
Growing Cell ◽  
Transmission Electron ◽  
Nuclear Stage ◽  
Functional Megaspore ◽  
Dictyosome Vesicles

Megagametophyte development in barley (Hordeum vulgare 'Atsel') was studied using Nomarski-interference optics and transmission electron microscopy. Stages described include the functional megaspore to cell wall formation. Aspects of the transition from the free nuclear stage of the embryo sac to the cellular embryo sac indicate involvement of elongate cell plates associated with clusters of microtubules. Initial cell walls among micropylar and chalazal nuclei are composed of beads derived from dictyosome vesicles. Fusion of growing cell plates occurs, especially within the antipodal apparatus.

Cell Wall Formation of Compression Wood in Todo Fir (Abies Sacharinensis) - I. Deposition of Polysaccharides

IAWA Journal ◽  
1992 ◽  
Vol 13 (3) ◽  
pp. 283-296 ◽  
Author(s):  
Keiji Takabe ◽  
Takaharu Miyauchi ◽  
Kazumi Fukazawa
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cell Wall ◽  
Compression Wood ◽  
Cell Wall Formation ◽  
Cytochemical Staining ◽  
Wall Formation ◽  
Ultraviolet Microscopy ◽  
Transmission Electron

Cell wall formation, particularly deposition of polysaccharides, of compression wood in Todo fir (Abies sacharinensis) was examined by either fluorescence and ultraviolet microscopy or by transmission electron microscopy coupled with cytochemical staining.

scholarly journals Cell wall formation in multinucleate pollen grains of Hordeum vulgare anthers cultured in vitro

2015 ◽  
Vol 48 (3) ◽  
pp. 377-380 ◽  
Author(s):  
Krystyna Idzikowska ◽  
Fortunat Młodzianowski
Keyword(s):  
Cell Wall ◽  
Hordeum Vulgare ◽  
Pollen Grains ◽  
Cell Wall Formation ◽  
Wall Formation ◽  
Pollen Protoplast

Cell wall formation in several-nucleate pollen grains of <i>Hordeum vulgare</i> anthers cultured in vitro was initiated at the intine. The walls grew centripetally and branched, dividing pollen protoplast into a several-celled embryoid.

CONTRIBUTION TO THE EMBRYOLOGY OF HOPPEA DICHOTOMA WILLD. (GENTIANACEAE)

1961 ◽  
Vol 39 (5) ◽  
pp. 1001-1006 ◽  
Author(s):  
Govindappa D. Arekal
Keyword(s):  
Cell Wall ◽  
Female Gametophyte ◽  
Embryo Sac ◽  
Cell Wall Formation ◽  
Polygonum Type ◽  
Wall Formation ◽  
Embryo Sac Development ◽  
In Series ◽  
Second Period

The mode of embryo sac development in Hoppea dichotoma Willd. conforms to the Polygonum type. No integumentary tapetum is organized around the female gametophyte. The organization of the endosperm follows the nuclear type. Simultaneous cell wall formation occurs throughout the endosperm when the embryo is at the 4- to 6-celled stage. The development of the embryo is assigned to the second period, V megarchetype and group 11 in series C′ in the system of embryogenic classification of Souèges. The endosperm and embryo of Gentianaceae are compared with those of Menyanthaceae.

Ethylene effects on cambial activity and cell wall formation in hypocotyls of Picea abies seedlings

1991 ◽  
Vol 82 (2) ◽  
pp. 219-224 ◽  
Author(s):  
Barbro S. M. Ingemarsson ◽  
Leif Eklund ◽  
Lennart Eliasson
Keyword(s):  
Cell Wall ◽  
Picea Abies ◽  
Cambial Activity ◽  
Cell Wall Formation ◽  
Wall Formation

Arabidopsis Callose Synthase Gene GSL8 is Required for Cell Wall Formation and Establishment and Maintenance of Quiescent Center

2014 ◽  
Vol 48 (4) ◽  
pp. 389-397
Author(s):  
Liu Lin ◽  
Quan Xianqing ◽  
Zhao Xiaomei ◽  
Huang Lihua ◽  
Feng Shangcai ◽  
...  
Keyword(s):  
Cell Wall ◽  
Quiescent Center ◽  
Cell Wall Formation ◽  
Callose Synthase ◽  
Wall Formation

scholarly journals MYB Transcription Factors and Its Regulation in Secondary Cell Wall Formation and Lignin Biosynthesis during Xylem Development

2021 ◽  
Vol 22 (7) ◽  
pp. 3560
Author(s):  
Ruixue Xiao ◽  
Chong Zhang ◽  
Xiaorui Guo ◽  
Hui Li ◽  
Hai Lu
Keyword(s):  
Cell Wall ◽  
Transcription Factors ◽  
Secondary Wall ◽  
Secondary Cell Wall ◽  
Lignin Biosynthesis ◽  
Cell Wall Formation ◽  
Long Distance ◽  
Secondary Cell Wall Formation ◽  
Myb Transcription Factors ◽  
Wall Formation

The secondary wall is the main part of wood and is composed of cellulose, xylan, lignin, and small amounts of structural proteins and enzymes. Lignin molecules can interact directly or indirectly with cellulose, xylan and other polysaccharide molecules in the cell wall, increasing the mechanical strength and hydrophobicity of plant cells and tissues and facilitating the long-distance transportation of water in plants. MYBs (v-myb avian myeloblastosis viral oncogene homolog) belong to one of the largest superfamilies of transcription factors, the members of which regulate secondary cell-wall formation by promoting/inhibiting the biosynthesis of lignin, cellulose, and xylan. Among them, MYB46 and MYB83, which comprise the second layer of the main switch of secondary cell-wall biosynthesis, coordinate upstream and downstream secondary wall synthesis-related transcription factors. In addition, MYB transcription factors other than MYB46/83, as well as noncoding RNAs, hormones, and other factors, interact with one another to regulate the biosynthesis of the secondary wall. Here, we discuss the biosynthesis of secondary wall, classification and functions of MYB transcription factors and their regulation of lignin polymerization and secondary cell-wall formation during wood formation.

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