Root Apical Meristem
Mostrando 1-12 de 51 artigos, teses e dissertações.
-
1. Sinalização no ganho de competência para a conversão de meristemas apicais radiculares de Catasetum fimbriatum em gemas caulinares / Signalling events in the competence acquisition to root apical meristem conversion of Catasetum fimbriatum into buds.
Durante esse trabalho de pesquisa verificou-se que a aquisição de competência para conversão de ápices radiculares de Catasetum fimbriatum em gemas caulinares aumentava à medida que as plantas envelheciam. Esse processo esteve relacionado ao estabelecimento do crescimento determinado das raízes e com a parada da atividade e re-organização estrutural
Publicado em: 2008
-
2. Meristem-Specific Suppression of Mitosis and a Global Switch in Gene Expression in the Root Cap of Pea by Endogenous Signals1
Two functionally distinct sets of meristematic cells exist within root tips of pea (Pisum sativum): the root apical meristem, which gives rise to the body of the root; and the root cap meristem, which gives rise to cells that differentiate progressively through the cap and separate ultimately from its periphery as border cells. When a specific number o
American Society of Plant Physiologists.
-
3. Pericycle Cell Proliferation and Lateral Root Initiation in Arabidopsis1
In contrast with other cells generated by the root apical meristem in Arabidopsis, pericycle cells adjacent to the protoxylem poles of the vascular cylinder continue to cycle without interruption during passage through the elongation and differentiation zones. However, only some of the dividing pericycle cells are committed to the asymmetric, formative
American Society of Plant Physiologists.
-
4. Developmental and environmental regulation of a bean chalcone synthase promoter in transgenic tobacco.
Regulatory properties of a 1.4-kilobase promoter fragment of the bean chalcone synthase CHS8 gene were examined by analysis of glucuronidase (GUS) activity in transgenic tobacco containing a CHS8-GUS gene fusion. The promoter was highly active in the root apical meristem and in petals, exclusively in those cells of the inner epidermis that accumulate anthocy
-
5. Effect of Auxin on Acropetal Auxin Transport in Roots of Corn
Acropetal [14C]indoleacetic acid (IAA) transport was investigated in roots of corn. At least 40 to 50% of this movement is dependent on activities in the root apex. Selective excision of various populations of cells comprising the root apex, e.g. the root cap, quiescent center, or proximal meristem show that the proximal meristem is the critical region in th
-
6. Roles for Class III HD-Zip and KANADI Genes in Arabidopsis Root Development1
Meristems within the plant body differ in their structure and the patterns and identities of organs they produce. Despite these differences, it is becoming apparent that shoot and root apical and vascular meristems share significant gene expression patterns. Class III HD-Zip genes are required for the formation of a functional shoot apical meristem. In addit
American Society of Plant Biologists.
-
7. Nonvascular, Symplasmic Diffusion of Sucrose Cannot Satisfy the Carbon Demands of Growth in the Primary Root Tip of Zea mays L.
Nonvascular, symplasmic transport of sucrose (Suc) was investigated theoretically in the primary root tip of maize (Zea mays L. cv WF9 x Mo 17) seedlings. Symplasmic diffusion has been assumed to be the mechanism of transport of Suc to cells in the root apical meristem (R.T. Giaquinta, W. Lin, N.L. Sadler, V.R. Franceschi [1983] Plant Physiol 72: 362-367), w
-
8. Transposon tagging of the Defective embryo and meristems gene of tomato.
The shoot and root apical meristems (SAMs and RAMs, respectively) of higher plants are mechanistically and structurally similar. This has led previously to the suggestion that the SAM and RAM represent modifications of a fundamentally homologous plan of organization. Despite recent interest in plant development, especially in the areas of meristem regulation
-
9. Auxin Metabolism in the Root Apical Meristem1
Within the root meristem of flowering plants is a group of mitotically inactive cells designated the quiescent center (QC). Recent work links the quiescent state to high levels of the growth regulator auxin that accumulates in the QC via polar transport. This in turn results in elevated levels of the enzyme ascorbic acid oxidase (AAO), resulting in a reducti
American Society of Plant Physiologists.
-
10. Effect of Boron on Cell Elongation and Division in Squash Roots
This work establishes that cessation of root elongation of intact squash (Cucurbita pepo L.) plants is an early result of boron deficiency. Root elongation is slowed by 6 hours and is virtually stopped as early as 24 hours after boron is first withheld from the nutrient solution. As root elongation ceased, cell elongation progressed distally into the region
-
11. The ROOT MERISTEMLESS1/CADMIUM SENSITIVE2 Gene Defines a Glutathione-Dependent Pathway Involved in Initiation and Maintenance of Cell Division during Postembryonic Root Development
Activation of cell division in the root apical meristem after germination is essential for postembryonic root development. Arabidopsis plants homozygous for a mutation in the ROOT MERISTEMLESS1 (RML1) gene are unable to establish an active postembryonic meristem in the root apex. This mutation abolishes cell division in the root but not in the shoot. We repo
American Society of Plant Physiologists.
-
12. Induction of Zygotic Polyembryos in Wheat: Influence of Auxin Polar Transport.
The effects of two auxin polar transport inhibitors, N-1-naphthylphthalamic acid (NPA) and 3,3[prime],4[prime],5,7-pentahydroxyflavone (quercetin), on attaining bilateral symmetry from radial symmetry during early wheat embryogenesis were investigated by using an in vitro culture system. Although NPA and quercetin belong to two different classes of auxin tra