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  • Articles: DFG German National Licenses  (2)
  • 1985-1989  (2)
  • 1986  (2)
  • Light and carbon assimilation  (1)
  • egg fertility  (1)
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  • Articles: DFG German National Licenses  (2)
Material
Years
  • 1985-1989  (2)
Year
  • 1986  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 42 (1986), S. 31-37 
    ISSN: 1570-7458
    Keywords: Mythimna convecta ; fecundity ; mating ; egg fertility ; adult life span ; survival ; temperature effects ; larval nutrition effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Des adultes de Mythimna convecta, élevés à 22° avec un aliment semi-artificiel ou sur des pousses d'Avena sativa L, ont été exposés à une gamme de températures constantes entre 10 et 30°. Les durées de la période précédent la ponte et la longvité ont été inversement proportionnelles à la température. La longvité des femelles vierges était significativement supérieure à celle des femelles accouplées. La fécondité réelle et la fertilité des oeufs ont été maximales à 20° et se sont abaissées tant pour les températures faibles qu'élevées. Quelle que soit la température, plus d'oeufs ont été pondus dans les jours suivant l'accouplement. La fécondité potentielle changeait avec le poids des nymphes et l'alimentation larvaire. La ponte moyenne quotidienne a été déterminée comme la pourcentage exprimé de la fécondité potentielle, et, ainsi que la survie, la relation avec le temps a été résumée en utilisant des modèles de régression non-linéaires. La température optimale pour la survie des mâles et des femelles vierges a été de 22.5°.
    Notes: Abstract Mythimna convecta adults, reared at 22°C on semi-artificial diet or oat seedlings (Avena sativa L.), were exposed to a range of constant temperatures between 10° and 30°C. Pre-oviposition period and adult life span were inversely proportional to temperature. Mean life span was significantly longer in virgin than in mated females. Actual fecundity and fertility of eggs peaked at 20°C and declined towards both high and low temperatures. Most eggs were laid during the first few days after mating, irrespective of temperature. Potential fecundity varied with pupal weight and larval nutrition. Mean daily oviposition was expressed as % potential fecundity realized and, like survival, the relationship with time was summarized using non-linear regression models. The optimum temperature for the survival of males and virgin females was 22.5°C.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2048
    Keywords: Carbon dioxide assimilation ; Light and carbon assimilation ; Spinacia (photosynthesis) ; Sucrose synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract When leaves of Spinacia oleracea L. were subjected to a decrease from a saturating to a limiting irradiance, photosynthetic carbon assimilation exhibited a pronounced lag. This comprised a postlower-illumination CO2 burst (Vines et al. 1982, Plant Physiol. 70, 629–631) and a slow increase in the rate of carbon assimilation to the new lower steady-state rate. The latter phenomenon was distinguishable from the former because it was present in leaves when photorespiration was inhibited by high concentrations of CO2 or by 2% O2. A lag which followed a decrease in irradiance was also evident in leaves of Zea mays in air or in isolated spinach protoplasts photosynthesising in high CO2. The lag was not stomatal in origin. The origin of the lag which followed the decrease in irradiance was investigated. Measurements of total 14CO2 fixation and 14C incorporated into sucrose during the transition in irradiance showed that sucrose synthesis displayed an overshoot during the transient which accounted for all of the carbon fixed during the first 90 s of the transition period. The behaviour of hexose phosphates in the intact leaf and in the cytosol was inconsistent with their supporting sucrose synthesis during the transient. It is concluded that the overshoot in sucrose synthesis imposes a drain on chloroplast intermediates which contributes to the temporary lag in the rate of carbon assimilation.
    Type of Medium: Electronic Resource
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