Results 231 to 240 of about 29,146 (264)
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Organization of the root apical meristem in angiosperms
American Journal of Botany, 2008Although flowers, leaves, and stems of the angiosperms have understandably received more attention than roots, the growing root tips, or root apical meristems (RAMs), are organs that could provide insight into angiosperm evolution. We studied RAM organization across a broad spectrum of angiosperms (45 orders and 132 families of basal angiosperms ...
Charles, Heimsch, James L, Seago
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THE ROOT APICAL MERISTEM OF OSMUNDA REGALIS
American Journal of Botany, 1984Roots of the Osmundaceae differ from most ferns in having more than one apical cell. The size of the apical initial group, which includes cells that are considered to be apical cells, varies directly with root diameter in Osmunda regalis L. Mitotic indices were 6.63% for apical cells, 7.45% for the entire apical group, 6.25% for distal derivatives, and
John A. Freeberg, Ernest M. Gifford
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Root Apical Meristem Pattern: Hormone Circuitry and Transcriptional Networks
2010In higher plants, growth and development relies on the spatiotemporal regulation of gene expression, which is under the control of both endogenous signals and external stimuli. In this chapter, recent advances in defining signaling machinery and genetic frameworks that underlie RAM patterning and mainte- nance are reviewed, with a focus on the ...
BITONTI, Maria Beatrice +1 more
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Stem cell ageing of the root apical meristem of Arabidopsis thaliana
Mechanisms of Ageing and Development, 2020Plants form new organs from pluripotent stem cells throughout their lives and under changing environmental conditions. In the Arabidopsis root meristem, a pool of stem cells surrounding a stem cell organizer, named Quiescent Center (QC), gives rise to the specific root tissues.
Annika Wein +2 more
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Root apical meristem diversity and the origin of roots: insights from extant lycophytes
Journal of Plant Research, 2020The independent origin of roots in lycophytes and euphyllophytes has been proposed, mainly based on paleobotanical records. However, the question of how roots evolved within these lineages remains unresolved. Root apical meristem (RAM) organization in lycophytes would provide a clue toward understanding the early evolution of roots.
Rieko Fujinami +2 more
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Shoot and Root Apical Meristems
2017The structure and organization of the shoot and root apical meristems is presented. Their functional zones and mechanism of functioning are described. The shoot apical meristem is presented as a dynamic structure that changes during leaf and stem formation.
Mirjana Pavlović, Ksenija Radotić
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Plant-Associated Microbes Alter Root Growth by Modulating Root Apical Meristem
2019Rhizobacteria are known to produce a variety of signal molecules which may modify plant growth by interfering with phytohormone balance. Among the microbial signals are phytohormones, known to contribute to plant endogenous pool of phytohormones. The current chapter describes different methods to study the regulation of gene expression in root apical ...
Anwar, Hussain +3 more
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THE DEVELOPMENT AND DYNAMICS OF THE ROOT APICAL MERISTEM
American Journal of Botany, 1984During the past ten years our concepts of the root apex and how it functions have expanded considerably. Through the use of several unique root tissue systems investigators have characterized the populations of cells which comprise the apex and have refined our views of the ways in which these populations interact to regulate aspects of root ...
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Apical meristem inhibition by tree and shrub roots
Journal of Biological Education, 1997The soil around shrub and tree roots inhibits seedling shoot and root growth.
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Apical meristems in mycorrhizal and uninfected roots ofCalluna vulgaris (L.) Hull
Plant and Soil, 1983Calluna vulgaris root meristems, either uninfected or infected byPezizella ericae, were compared using light and transmission electron microscopy. In lightly infected ‘hair’ roots, active tips contained initial cells and derivates similar to those of the uninfected roots.
BERTA, Graziella, BONFANTE FASOLO P.
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