Embryonic Axes
Mostrando 1-12 de 41 artigos, teses e dissertações.
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1. Métodos de regeneração in vitro da mamoneira a partir de diferentes tipos de explantes.
2003
Revista Brasileira de Oleaginosas e Fibrosas. Publicado em: 2011
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2. Effect of desiccation and cryopreservation on the germination of embryonic axes and seeds of cotton.
O objetivo do presente trabalho foi explorar a viabilidade da crioconservacao de sementes como um metodo de conservacao do patrimonio genetico do algodao. Sementes de cinco cultivares de algodao (Gossypium hirsutum L.) (CNPA 4M, CNPA 5M, CNPA Precose 1, CNPA precose 2 e Coker 312) foram submetidas a dessecacao e/ou imersao em nitrogenio liquido. A germinacao
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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3. Desiccation tolerance and sensitivity in Medicago truncatula and Inga vera seeds
Orthodox seeds acquire desiccation tolerance (DT) during their development which enables them to pass through the phase of maturation drying by the end of their development and enter a state of quiescence. After harvesting, these seeds can be dried further and stored for the long-term without significant loss of viability. On the other hand, there are many s
Publicado em: 2006
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4. Purine Nucleotide Metabolism of Germinating Soybean Embryonic Axes
Isolated soybean (Glycine max L. cv. Kent) embyronic axes metabolized [14C]glycine to ATP within the 1 hour of imbibition. Radioactivity was not detected in GTP until the 3rd hour. Throughout most of the first 24 hours of germination about 10 to 26 times as much label from [14C]glycine appears in ATP as GTP. About five times as much [14C]hypoxanthine and [14
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5. The Effects of Abscisic Acid on Growth and Nucleic Acid Synthesis in Excised Embryonic Bean Axes 1
Abscisic acid (ABA) is an effective inhibitor of cell elongation in excised embryonic bean axes whether added prior to or after the initiation of cell elongation. Zeatin partially reverses this growth inhibition. ABA inhibits 32P incorporation into ribosomal RNA, transfer RNA, and DNA but not into the tenaciously bound fraction of elongating axes in a manner
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6. Hydrogen Peroxide Metabolism in Soybean Embryonic Axes at the Onset of Germination 1
Hydrogen peroxide steady state levels of 5 micromolar were determined in soybean (Glycine max) embryonic axes incubated for 2 hours and in axes pretreated with aminotriazole or cyanide, where these levels were 50 and 1 micromolar, respectively. The activities of catalase (105 picomoles H2O2 per minute per axis), peroxidase (10-44 picomoles H2O2 per minute pe
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7. Metabolism of 2-14C-(±)-Abscisic Acid in Excised Bean Axes 1
Excised embryonic bean axes (Phaseolus vulgaris, var. White Marrowfat) rapidly metabolize 2-14C-(±)-abscisic acid to two compounds, M-1 and M-2, which have very low growth-inhibitory activity. Chemical tests indicate the M-1 and M-2 are not previously described abscisic acid metabolites. M-2 accumulates in the axes and evidence is presented for the hypothes
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8. Influence of Cotyledons upon α-Amylase Activity in Pea Embryonic Axes
α-Amylase activity remained relatively low in the axes of intact etiolated pea seedlings; the activity was predominantly confined to the epicotyl. Starch accumulated slightly. When the cotyledons were removed and the axes cultured on medium containing no carbon source, the starch reserve in the axes disappeared within a few days. This was accompanied by a 1
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9. Adenylate Metabolism of Embryonic Axes from Deteriorated Soybean Seeds
RNA and protein syntheses in axes excised from dry soybean (Glycine max L.) seeds at different levels of deterioration were assayed. Low rates of protein synthesis in slightly deteriorated seeds were not due to losses in ribosomal or soluble fraction activities. However, the lowered rates of RNA and protein syntheses of deteriorated seeds were associated wit
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10. Oxidative Stress Affects [alpha]- Tocopherol Content in Soybean Embryonic Axes upon Imbibition and following Germination.
The content of [alpha]-tocopherol ([alpha]T) in isolated soybean (Glycine max, var Hood) embryonic axes was measured upon germination. Dry, high-vigor axes contained 1.2 [plus or minus] 0.1, nmol/axis and after an increase during the initial 6 h of imbibition, there was a decline to 1.0 [plus or minus] 0.1 nmol/axis at 24 h of incubation. Incubation in the p
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11. Germination of Soybean Embryonic Axes: Nucleotide Sugar Metabolism and Initiation of Growth 1
UDP-Sugars comprise the dominant class of nucleotide sugars in isolated soybean axes during early germination. While “dry” axes contain 1 nanomole per axis of UDP-sugars, further synthesis is initiated upon imbibition such that the concentration of total UDP-sugars reaches 8 nanomoles per axis or roughly 1 millimolar after 10 hours, when the axes begin t
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12. Ascorbic Acid Metabolism in Pea Seedlings. A Comparison of d-Glucosone, l-Sorbosone, and l-Galactono-1,4-Lactone as Ascorbate Precursors1
l-Ascorbic acid (AsA) accumulates in pea (Pisum sativum L.) seedlings during germination, with the most rapid phase of accumulation coinciding with radicle emergence. Monodehydroascorbate reductase and dehydroascorbic acid reductase were active in the embryonic axes before AsA accumulation started, whereas AsA oxidase and AsA peroxidase activities increased
American Society of Plant Physiologists.