VALEUR COMPETITIVE DES PLANTES AUTOTETRAPLOIDES D'ARABIDOPSIS THALIANA

1972 ◽  
Vol 14 (2) ◽  
pp. 257-263 ◽  
Author(s):  
J. Bouharmont ◽  
F. Macé
Keyword(s):  
Arabidopsis Thaliana ◽  
Seed Germination ◽  
Mitotic Activity ◽  
Chromosome Doubling ◽  
Plant Competition ◽  
Mixed Cultures ◽  
The Other ◽  
Seed Number ◽  
Meristematic Cells ◽  
Tetraploid Strain

In mixed cultures, an induced autotetraploid strain of Arabidopsis thaliana could supersede the original diploid. The fitness of these tetraploid plants was elucidated by comparing some factors acting on plant competition. The tetraploids were generally higher for seed germination and number of pods, but generally showed a later flowering and a lower seed number per pod. The whole balance was on behalf of the tetraploid strain. On the other hand the chromosome doubling did not impair the mitotic activity in Arabidopsis meristematic cells, and this fact may explain the growth and fitness of the tetraploid plants of that species.

Ontogenetic, Light, and Circadian Regulation of PAP Protein Genes during Seed Germination of Arabidopsis thaliana

2021 ◽  
Vol 500 (1) ◽  
pp. 312-316
Author(s):  
A. A. Andreeva ◽  
N. V. Kudryakova ◽  
Vl. V. Kuznetsov ◽  
V. V. Kusnetsov
Keyword(s):  
Arabidopsis Thaliana ◽  
Seed Germination ◽  
Circadian Regulation

scholarly journals Effect of NaCl on seed germination in some Centaurium Hill. Species (Gentianaceae)

2007 ◽  
Vol 59 (3) ◽  
pp. 227-231 ◽  
Author(s):  
S. Zivkovic ◽  
M. Devic ◽  
B. Filipovic ◽  
Z. Giba ◽  
D. Grubisic
Keyword(s):  
Life History ◽  
Salt Tolerance ◽  
Seed Germination ◽  
Gibberellic Acid ◽  
White Light ◽  
The Other ◽  
Distilled Water ◽  
Nacl Concentration ◽  
History Of ◽  
Species Specific

The influence of high NaCl concentrations on seed germination in both light and darkness was examined in the species Centaurium pulchellum, C. erythraea, C. littorale, C. spicatum, and C. tenuiflorum. Salt tolerance was found to depend on the life history of the seeds. To be specific, seeds of all five species failed to complete germination when exposed to continuous white light if kept all the time in the presence of 100-200 mM and greater NaCl concentrations. However, when after two weeks NaCl was rinsed from the seeds and the seeds were left in distilled water under white light for an additional two weeks, all species completed germination to a certain extent. The percent of germination not only depended on NaCl concentration in the prior medium, but was also species specific. Thus, seeds of C. pulchellum, C. erythraea, and C. littorale completed germination well almost irrespective of the salt concentration previously experienced. On the other hand, seeds of C. tenuiflorum completed germination poorly if NaCl concentrations in the prior media were greater than 200 mM. When seeds after washing were transferred to darkness for an additional 14 days, they failed to complete germination if previously imbibed on media containing NaCl concentrations greater than 400 mM. However, the seeds of all species, even if previously imbibed at 800 mM NaCl, could be induced to complete germination in darkness by 1 mM gibberellic acid. .

scholarly journals Genome-Wide Characterization and Expression Analysis of KH Family Genes Response to ABA and SA in Arabidopsis thaliana

2022 ◽  
Vol 23 (1) ◽  
pp. 511
Author(s):  
Yanjie Zhang ◽  
Yu Ma ◽  
Ruiqi Liu ◽  
Guanglin Li
Keyword(s):  
Arabidopsis Thaliana ◽  
Seed Germination ◽  
Nucleic Acid Binding ◽  
Phylogenetic Tree Analysis ◽  
Genome Wide ◽  
Binding Factor ◽  
Pathogenesis Related ◽  
Kh Domain ◽  
Family Based ◽  
Related Proteins

K-homologous (KH) family is a type of nucleic acid-binding protein containing the KH domain and has been found to affect splicing and transcriptional regulation. However, KH family genes haven’t been investigated in plant species systematically. In this study, we identified 30 genes that belonged to the KH family based on HMM of the KH domain in Arabidopsis thaliana. Phylogenetic tree analysis showed that the KH family is grouped into three subgroups. Synteny analysis showed that AtKH9 and AtKH29 have the conserved synteny relationship between A. thaliana and the other five species. The AtKH9 and AtKH29 were located in the cytoplasm and nucleus. The seed germination rates of the mutants atkh9 and atkh29 were higher than wild-type after abscisic acid (ABA) and salicylic acid (SA) treatments. In addition, the expression of ABA-related genes, such as ABRE-binding factor 2 (ABF2), ABRE-binding factor 4 (ABF4), and delta 1-pyrroline-5-carboxylate synthase (P5CS), and an SA-related gene pathogenesis-related proteins b (PR1b) were downregulated after ABA and SA treatments, respectively. These results suggested that atkh9 and atkh29 mutants inhibit the effect of ABA and SA on seed germination. In conclusion, our results provide valuable information for further exploration of the function of KH family genes and propose directions and ideas for the identification and characterization of KH family genes in other plants.

scholarly journals Rooting Induction in Allium cepa for the Study of Mitosis in a Hydroponics System

2020 ◽  
pp. 1-5
Author(s):  
Geovanio Alves da Silva ◽  
Eder Ferreira Arriel ◽  
Mellina Nicácio da Luz ◽  
Valeska Regina Silva Martins ◽  
Elisabeth de Oliveira ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Genetic Information ◽  
Water Source ◽  
The Other ◽  
Root Mass ◽  
Root Number ◽  
Experiment Data ◽  
Hydroponic System ◽  
Meristematic Cells ◽  
System Water

The study of cell division processes is important for the understanding of how genetic information is transmitted from cell to cell and to descendants. To observe the phases of mitosis in meristematic cells of the onion root (Allium cepa), it is necessary to induce the rooting of this bulb that can be influenced by some factors like the type of water and the preparation form of the bulb of the onion for the success of rhizogenesis. In view of the above, the objective was to evaluate the influence of the water source and the opening of holes in the stem of the propagule to induce rooting in a hydroponic system. Two experiments were installed. In the first, one of the treatments was used distilled water and treated water. In the other experiment, three treatments were evaluated (without holes, few holes and a lot of holes in the stem of the bulb). Five days after installation of the first experiment, data were collected on the number of bulbs that gave off roots and this variable was analyzed using the X2 test. In the other test, also at five days, root number and fresh root mass data were obtained and the data were submitted for analysis of variance and the means were compared by the Scott-Knott test. For the induction of rooting in onion bulbs (Allium cepa) in a hydroponic system, water should be used, preferably treated, cleaned and decontaminated. The stem of the onion bulb should receive many perforations to facilitate the absorption of water with the essential nutrients for rooting.

scholarly journals Early development of corn seedlings primed with synthetic tenorite nanofertilizer

2020 ◽  
Vol 42 ◽  
Author(s):  
Michel Esper Neto ◽  
David W. Britt ◽  
Kyle Alan Jackson ◽  
Alessandro Lucca Braccini ◽  
Tadeu Takeyoshi Inoue ◽  
...  
Keyword(s):  
Seed Germination ◽  
Size Effects ◽  
Seed Priming ◽  
Seedling Development ◽  
Cuo Nanoparticles ◽  
The Other ◽  
Corn Seed ◽  
Cu Toxicity ◽  
Germination And Growth

Abstract: Fertilizer formulation alternatives that avoid unnecessary losses and environmental impacts are being investigated in agricultural management. Seed priming with nanofertilizers prior to planting, reduces concerns about non-target dispersion; however, priming formulations and concentrations must be carefully selected to avoid undesired effects. Here, seed germination and seedling development were evaluated after seed priming with CuO nanoparticles (NPs), CuO bulk and CuCl2. The seeds were immersed in priming solutions of 0, 20, 40, 80 and 160 mg.L−1 Cu for the three Cu sources. Following 8 hours priming, the seeds were evaluated for germination and vigor (first germination count). Root and shoot lengths were measured as well as shoot and root dry biomass. The copper NP did not show any toxic effects on corn seed germination and growth, and also promoted higher biomass when compared to the other Cu sources. On the other hand, CuCl2 primed seeds exhibited Cu-toxicity in roots and shoots for all concentrations tested. Bulk Cu priming results indicated the better role of NPs size effects. These findings support NP-seed priming as an alternative to delivery of essential micronutrients, such as copper, to corn seedlings.

scholarly journals KNOX HOMOLOGS SHOOT MERISTEMLESS (STM) and KNAT6 are epistatic to CLAVATA3 (CLV3) during embryonic meristem development in Arabidopsis thaliana

2020 ◽  
Author(s):  
Sharma Nidhi ◽  
Liu Tie
Keyword(s):  
Arabidopsis Thaliana ◽  
Shoot Apex ◽  
Double Mutant ◽  
Genetic Interaction ◽  
Homeobox Gene ◽  
The Other ◽  
Shoot Meristem ◽  
Published Data ◽  
Meristem Development ◽  
Shoot Meristemless

AbstractIn Arabidopsis, the genes SHOOT MERISTEMLESS (STM) and CLAVATA3 (CLV3) antagonistically regulate shoot meristem development. STM is essential for both development and maintenance of the meristem, as stm mutants fail to develop a shoot meristem during embryogenesis. CLV3, on the other hand, negatively regulates meristem proliferation, and clv3 mutants possess an enlarged shoot meristem. Genetic interaction studies revealed that stm and clv3 dominantly suppress each other’s phenotypes. STM works in conjunction with its closely related homologue KNOTTED1-LIKE HOMEOBOX GENE 6 (KNAT6) to promote meristem development and organ separation, as stm knat6 double mutants fail to form a meristem and produce a fused cotyledon. In this study, we show that clv3 fails to promote post-embryonic meristem formation in stm-1 background if we also remove KNAT6. stm-1 knat6 clv3 triple mutants result in early meristem termination and produce fused cotyledons similar to stm knat6 double mutant. Notably, the stm-1 knat6 and stm-1 knat6 clv3 alleles lack tissue in the presumed region of SAM. stm knat6 clv3 also showed reduced inflorescence size and shoot apex size as compared to clv3 single or stm clv3 double mutants. In contrast to previously published data, these data suggest that stm is epistatic to clv3 in postembryonic meristem development.HighlightSTM and KNAT6 genes determine post-embryonic meristem formation and activity in Arabidopsis. clv3 mutation is unable to rescue the stm knat6 meristemless phenotype.

scholarly journals Las creencias indígenas y neo-indias en la frontera MEX/USA

Revista Trace ◽  
2018 ◽  
pp. 45
Author(s):  
Miguel Olmos Aguilera
Keyword(s):  
Mixed Cultures ◽  
The Other ◽  
The North ◽  
Native Identity ◽  
Racially Mixed ◽  
Mixed Groups ◽  
Los Grupos ◽  
Fertile Land

En este artículo se analizan y describen las creencias indígenas originarias de la frontera norte, así como algunas creencias mestizas de tipo popular. Se hace hincapié en las creencias vinculadas con nuevas formas de identidad indígena y mestiza que se mueven en el terreno de la ficción. La identificación “neoindia” no es construida por los grupos indígenas, sino por mestizos que sin una identidad anclada en la memoria tradicional suelen adherirse a una identidad ancestral generada en múltiples religiones del escenario fronterizo o del imaginario mítico de la mesoamérica mexica. La Frontera Norte, como lugar donde las referencias culturales se pierden y transforman rápidamente, tanto la cultura indígena como la mestiza, se han convertido en un terreno fértil para la invención del “otro” mediante la transformación constante de sus prácticas religiosas.Abstract: This article analyzes and describes the native beliefs of the North Border, as well as some popular racial mixed beliefs. Emphasizing in the ones linked with new forms of racial mixed and native identity in the fiction area. The identification of “neoindia” is not built for native but for racially mixed groups that, without an identity anchored in the traditional memory, are used to adhere to an ancient identity generated from multiple religions of the border or of the mythical imaginary of Mexica Mesoamerica. The North Border, a place where cultural references are lost and quickly transformed, both native and racially mixed cultures have become a fertile land for the invention of the “Other” through the constant transformation of its religious practices.Résumé : Dans cet article, on analyse et on décrit les croyances indiennes de la Frontière Nord du Mexique, ainsi que quelques croyances métissées de type populaire. On s’intéresse en particulier aux croyances en relation avec de nouvelles formes d’identité indiennes et métisses qui se déploient sur le terrain de la fiction. L’identification “néo-indienne” n’est pas construite par les groupes indiens, mais par les métis dont l’identité n’est pas ancrée dans la mémoire traditionnelle et qui se réfèrent souvent à une identité ancestrale, générée dans de multiples religions du cadre frontalier ou de l’imaginaire mythique de la Mésoamérique mexicaine. À la Frontière Nord, en tant que lieu où les références culturelles se perdent et se transforment rapidement, les cultures indiennes et métisses se sont converties en un terrain fertile pour l’invention de l’« Autre » par l’entremise de la constante transformation des pratiques religieuses.

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