The shoot apical meristem of Arabidopsis thaliana contains a reservoir of pluripotent stem cells that functions as a continuous source of new cells for organ formation during development. The SAM forms during embryogenesis, when it becomes stratified into specific cell layers and zones that can be delineated based on morphological and molecular criteria. The primary SAM produces all the aerial structures of the adult plant, and alterations in SAM organization or function can have profound effects on vegetative and reproductive plant morphology. Such SAM-specific defects can be identified, evaluated, and quantified using specialized microscopic and histological techniques.
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http://dx.doi.org/10.1007/978-1-60761-765-5_8 | DOI Listing |
Physiol Plant
December 2024
Graduate School of Life Sciences, Toyo University, Asaka-shi, Saitama, Japan.
In many plant species, the application of exogenous phytohormones is crucial for initiating de novo shoot regeneration. However, ipecac [Carapichea ipecacuanha (Brot) L. Andersson] has a unique ability to develop adventitious shoots on the epidermis of internodal segments without phytohormone treatment.
View Article and Find Full Text PDFFlowering of Henon bamboo ( var. ) was observed in Japan in 2020s. We estimated that the observation of flowering was recorded for the first time in 120 y.
View Article and Find Full Text PDFAnn Bot
December 2024
Laboratório de Anatomia Vegetal (LAVeg), Federal University of Rio Grande do Sul, Av. Bento Gonçalves, 9500, Porto Alegre, RS, Brazil.
Background And Aims: Recent studies have documented numerous morphoanatomical variations for the seed coat in Bromeliaceae. However, the structural diversity and character evolution of the embryo within this family remain largely unexplored. Given the embryo's significance in plant diversification, this research aims to investigate the morphology and key anatomical features of Bromeliaceae embryos, providing insights into character evolution, taxonomic applications, and reproductive biology.
View Article and Find Full Text PDFPlants (Basel)
December 2024
School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA.
The reduction of leaves was a key event in the evolution of the succulent syndrome in Cactaceae, evolving from large, photosynthetic leaves in to nearly suppressed microscopic foliar buds in succulent . This leaf reduction was accompanied by the development of spines. Early histological studies, dating back a century, of the shoot apical meristem (SAM) in several species concluded that, in succulent cacti, axillary buds became areoles and leaves transformed into spines.
View Article and Find Full Text PDFCells
November 2024
Laboratory of Plant Cytology and Embryology, Department of Plant Experimental Biology and Biotechnology, Faculty of Biology, University of Gdańsk, 59 Wita Stwosza St., 80-308 Gdansk, Poland.
(L.) Rich, an endangered member of the Orchidaceae family, is found in alkaline fens. With the declining populations of , there is a pressing need to reintroduce this species in Central Europe.
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