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Digitale Medien

Photoperiod-induced changes in gibberellin metabolism in relation to apical growth and senescence in genetic lines of peas (Pisum sativum L.) (1978)

Proebsting, William M. ; Davies, Peter J. ; Marx, G. A.

Springer

Planta 141 (1978), S. 231-238

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ISSN: 1432-2048

Schlagwort(e): Apical senescence ; Gibberellins ; Photomorphogenesis ; Pisum ; Senescence

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract In an early-flowering line of pea (G2) apical senescence occurs only in long days (LD), while growth in short days (SD) is indeterminate. In SD, G2 plants are known to produce a graft-transmissible substance which delays apical senescence in related lines that are photoperiod-insensitive with regard to apical senescence. Gibberellic acid (GA3) applied to the apical bud of G2 plants in LD delayed apical senescence indefinitely, while N6-benzyladenine and α-naphthaleneacetic acid were ineffective. Of the gibberellins native to pea, GA9 had no effect whereas GA20 had a moderate senescence-delaying effect. [3H]GA9 metabolism in intact leaves of G2 plants was inhibited by LD and was restored by placing the plants back in SD. Leaves of photoperiod-insensitive lines (I-types) metabolized GA9 readily regardless of photoperiod, but the metabolites differed qualitatively from those in G2 leaves. A polar GA9 metabolite, GAE, was found only in G2 plants in SD. The level of GA-like substances in methanol extracts from G2 plants dropped about 10-fold after the plants were moved from SD to LD; it was restored by transferring the plants back to SD. A polar zone of these GA-like materials co-chromatographed with GAE. It is suggested that a polar gibberellin is synthesized by G2 plants in SD; this gibberellin promotes shoot growth and meristematic activity in the shoot apex, preventing senescence.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00388337

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Digitale Medien

Evidence for a graft-transmissible substance which delays apical senescence in Pisum sativum L. (1977)

Proebsting, W. M. ; Davies, P. J. ; Marx, G. A.

Springer

Planta 135 (1977), S. 93-94

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ISSN: 1432-2048

Schlagwort(e): Apical senescence ; Pisum ; Photomorphogenesis ; Grafting ; Growth regulators ; Senescence

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Apical senescence in an early flowering line of pea, G2, is greatly delayed by short days. This behavior is controlled by two dominant genes. Apical senescence of ungrafted, insensitive (I) lines is unaffected by photoperiod. When I-type scions with one of the two required genes were grafted onto G2, apical senescence of the I-type was delayed in short days, but not in long days. Flowering of the I-type was unaffected. The apex of the G2 stock was unaffected as well. Apical senescence of an I-type line lacking both photoperiod genes was not delayed when grafted on G2 in short days. It is concluded that G2 plants grown in short days produce a graft-transmissible factor which delays apical senescence of photoperiodically insensitive lines.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00387982

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Digitale Medien

Evaluation of noninvasive determinants for capillary leakage syndrome in septic shock patients (2000)

Marx, G. ; Vangerow, B. ; Burczyk, C. ; [weitere]

Springer

Intensive care medicine 26 (2000), S. 1252-1258

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ISSN: 1432-1238

Schlagwort(e): Capillary leak syndrome Critical illness Sepsis Blood volume determination Bioelectric impedance Osmotic pressure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract. Objective: Capillary leakage syndrome (CLS) is a frequent complication in sepsis, characterized by loss of intravasal fluids leading to generalized edema and hemodynamic instability despite massive fluid therapy. In spite of its importance no standardized diagnostic criteria are available for CLS. Design: Prospective clinical study. Setting: 1800-bed university hospital Patients: Six septic shock patients with CLS were compared to six control patients. Measurements and results: CLS was clinically determined by generalized edema, positive fluid balance, and weight gain. Plasma volume was measured by indocyanine green, red blood cell volume by chromium-51 labeled erythrocytes, and colloid osmotic pressure before and 90 min after the administration of 300 ml 20% albumin. Extracellular water (ECW) was measured using the inulin distribution volume and bioelectrical impedance analysis. Red blood cells averaged 20.2±1.0 ml/kg body weight in CLS patients and 23.3±4.1 in controls. ECW was higher in CLS patients than in controls (40.0±6.9 vs. 21.7±3.7 l; p〈0.05). ECW of inulin was correlated with that measured by bioelectrical impedance analysis (r=0.74, p〈0.01). The increase in colloid osmotic pressure over the 90 min was less in CLS patients than in controls (1.1±0.3 vs. 2.8±1.3 mmHg; p〈0.05). Conclusion: These results suggest that measurements of an increased ECW using bioelectrical impedance analysis combined with a different response of colloid osmotic pressure to administration of albumin can discriminate noninvasively between patients with and those without CLS.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s001340000601

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