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Digitale Medien

Plastid ultrastructure and photosynthesis in greening petaloid hypsophylls (1985)

Weidner, M. ; Franz, A. ; Napp-Zinn, K.

Springer

Planta 163 (1985), S. 164-174

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ISSN: 1432-2048

Schlagwort(e): Greening ; Guzmania ; Heliconia ; Hypsophyll ; Plastid transformation ; Postfloral greening ; Spathiphyllum

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract The ultrastructural and biochemicalphysiological aspects of postfloral greening have been studied in hypsophylls of Heliconia aurantiaca Ghiesbr., Guzmania cf. x magnifica Richter and Spathiphyllum wallisii Regel. In all three species the greening of the hypsophylls is due to plastid transformation, chloroplast formation proceeding from the initially different types of plastids. The degradation process of the original plastid structures and the mode of thylakoid formation are distinct in each case. In none of the species do the transformed plastids look identical to the chloroplasts of the corresponding foliage leaves. On a chlorophyll basis, the rate of photosynthesis of the greened hypsophylls surpasses the rate of the leaves considerably in Spathiphyllum, but is much lower in Heliconia (no data for Guzmania). In all species, anatomy, plastid structure, pigments, 77° K-fluorescence emission, ribulose-1,5-bis-phosphate carboxylase activities and short-term photosynthesis 14CO2-assimilation patterns prove the greened hypsophylls to be capable of providing additional carbon to the developing fruits, thus supplementing the import of organic matter from the foliage leaves.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00393502

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Digitale Medien

ENDOR and triple resonance studies of 1,4-dihydro-1,2,4-benzotriazinyl radicals and 1,4-dihydro-1,2,4-benzotriazine radical cations (1988)

Neugebauer, Franz A. ; Rimmler, Gösta

Chichester : Wiley-Blackwell

Organic Magnetic Resonance 26 (1988), S. 595-600

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ISSN: 0749-1581

Schlagwort(e): ENDOR ; Triple resonance spectroscopy ; 1H NMR ; 1,4-Dihydro-1,2,4-benzotriazinyl radicals ; 1,4-Dihydro-1,2,4-benzotriazine radical cations ; Chemistry ; Analytical Chemistry and Spectroscopy

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: ESR, ENDOR and triple resonance studies of 1,4-dihydro-1,3-diphenyl- (1a) and 3-tert-butyl-1,4-dihydro-1-phenyl-1,2,4-benzotriazinyl (2a) and of the corresponding radical cation 3a (2a protonated at N-4) yielded the magnitude and the sign of almost all of the 1H and 14N hyperfine coupling (HFC) constants. Their assignment was performed using various 2H labelled and/or methyl substituted derivatives. Both radical groups show major hyperfine coupling to the three 14N nuclei. In the uncharged species 1a and 2a, the spin density at N-4 apparently directs the 1H HFC pattern in the 1,2,4-benzotriazinyl component, a(H-5) and a(H-7) being larger than a(H-6) and a(H-8). In the radical cation, on the other hand, N-1, with an unusually large splitting of 9.9 G, is the position of highest spin density which determines the 1H HFC pattern, a(H-6) and a(H-8) being larger than a(H-7).

Zusätzliches Material: 5 Ill.