La genèse du bulbe et son enfouissement chez les semis de Tulipa gesneriana

1981 ◽  
Vol 59 (7) ◽  
pp. 1322-1330 ◽  
Author(s):  
Jeanine Taillandier ◽  
Simonne Riviere
Keyword(s):  
Apical Meristem ◽  
Tulipa Gesneriana ◽  
Small Cavity ◽  
Cotyledonary Sheath

In tulip seedlings, a cluster of slightly chromophilic cells are formed at the bottom of a small cavity at the base of the cotyledonary sheath. During the first 5 weeks of seed hydration, the cells of this cluster divide and thus form the apical meristem. When the first leaf is initiated, a hollow diverticulum, the dropper, differentiates at the base of the cotyledon. It is located laterally with respect to the axis of the plantlet. The dropper is produced by the tissues of the cotyledonary sheath, and partly by those of the hypocotyl. The dropper buries itself vertically in the substrate, drawing down the apical meristem which is enclosed within its extremity. At this stage, statocyts are observed in the wall of the dropper. The first leaf develops into a typical starchy bulb scale. Thus the primordial bulb is formed when the growth of the dropper is terminated.

SEM study of the morphological effects of kinetin and zeatin on the growth and development of the apical meristem in wheat

1995 ◽  
Vol 53 ◽  
pp. 978-979
Author(s):  
G. M. Hutchins ◽  
J. S. Gardner
Keyword(s):  
Growth And Development ◽  
Furfuryl Alcohol ◽  
Apical Meristem ◽  
Plant Cells ◽  
Triticum Aestivum L ◽  
Morphological Development ◽  
Naturally Occurring ◽  
Chinese Spring Wheat ◽  
Sem Study ◽  
Moist Environment

Cytokinins are plant hormones that play a large and incompletely understood role in the life-cycle of plants. The goal of this study was to determine what roles cytokinins play in the morphological development of wheat. To achieve any real success in altering the development and growth of wheat, the cytokinins must be applied directly to the apical meristem, or spike of the plant. It is in this region that the plant cells are actively undergoing mitosis. Kinetin and Zeatin were the two cytokinins chosen for this experiment. Kinetin is an artificial hormone that was originally extracted from old or heated DNA. Kinetin is easily made from the reaction of adenine and furfuryl alcohol. Zeatin is a naturally occurring hormone found in corn, wheat, and many other plants.Chinese Spring Wheat (Triticum aestivum L.) was used for this experiment. Prior to planting, the seeds were germinated in a moist environment for 72 hours.

Marangoni effects on natural convection in a small cavity

2002 ◽  
Author(s):  
Shinji Nakagawa ◽  
Masaki Azuma ◽  
Masashi Okada
Keyword(s):  
Natural Convection ◽  
Small Cavity ◽  
Marangoni Effects

Delivery of CRISPR/Cas9 Ribonucleoprotein Complex into Plant Apical Meristem Cells Leads to Large Deletions in an Editing Gene

2020 ◽  
Vol 46 (6) ◽  
pp. 1242-1249
Author(s):  
A. V. Khromov ◽  
A. V. Makhotenko ◽  
S. S. Makarova ◽  
T. P. Suprunova ◽  
N. O. Kalinina ◽  
...  
Keyword(s):  
Apical Meristem ◽  
Ribonucleoprotein Complex ◽  
Large Deletions

Critical level of radiation damage of root apical meristem and mechanisms for its recovery in Pisum sativum L.

2011 ◽  
Vol 45 (1) ◽  
pp. 18-26 ◽  
Author(s):  
E. A. Kravets ◽  
A. N. Mikheev ◽  
L. G. Ovsyannikova ◽  
D. M. Grodzinsky
Keyword(s):  
Pisum Sativum ◽  
Radiation Damage ◽  
Apical Meristem ◽  
Critical Level ◽  
Root Apical Meristem ◽  
Pisum Sativum L

scholarly journals Sound Waves Promote Arabidopsis thaliana Root Growth by Regulating Root Phytohormone Content

2021 ◽  
Vol 22 (11) ◽  
pp. 5739
Author(s):  
Joo Yeol Kim ◽  
Hyo-Jun Lee ◽  
Jin A Kim ◽  
Mi-Jeong Jeong
Keyword(s):  
Arabidopsis Thaliana ◽  
Cell Division ◽  
Root Growth ◽  
Apical Meristem ◽  
Cell Number ◽  
Root Apical Meristem ◽  
Control Group ◽  
Auxin Signaling ◽  
Ethylene Signaling ◽  
Sound Waves

Sound waves affect plants at the biochemical, physical, and genetic levels. However, the mechanisms by which plants respond to sound waves are largely unknown. Therefore, the aim of this study was to examine the effect of sound waves on Arabidopsis thaliana growth. The results of the study showed that Arabidopsis seeds exposed to sound waves (100 and 100 + 9k Hz) for 15 h per day for 3 day had significantly longer root growth than that in the control group. The root length and cell number in the root apical meristem were significantly affected by sound waves. Furthermore, genes involved in cell division were upregulated in seedlings exposed to sound waves. Root development was affected by the concentration and activity of some phytohormones, including cytokinin and auxin. Analysis of the expression levels of genes regulating cytokinin and auxin biosynthesis and signaling showed that cytokinin and ethylene signaling genes were downregulated, while auxin signaling and biosynthesis genes were upregulated in Arabidopsis exposed to sound waves. Additionally, the cytokinin and auxin concentrations of the roots of Arabidopsis plants increased and decreased, respectively, after exposure to sound waves. Our findings suggest that sound waves are potential agricultural tools for improving crop growth performance.

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