| | 1 | Author
| A. Hloušek-Radojčič, N. Ljubešič | Requires cookie* | | | Title
| The Development of Daffodil Chromoplasts in the Presence of Herbicides SAN 9789 and SAN 9785  | | | | Abstract
| The effects of two pyridazinone herbicides (SAN 9789 and SAN 9785) were studied on the fine structure and carotenoid composition during the transformation of chloroplasts into chromoplasts in daffodil (Narcissus poëticus L.) flowers. SAN 9789 caused the absence of big characteristic carotene crystals and the appearance of numerous nonosmiophilic plastoglobuli in chromoplasts. The accumulation of all carotenoids was drastically reduced and the content of carotenes was 40-fold lower than in the control. SAN 9785 caused no gross abnormalities in ultrastructure of chromoplasts. The synthesis of carotenes was partially reduced to about 75%. In spite of this the accumulation of xanthophylls is two times higher than in the control. The interaction between chromoplast ultrastructure and carotenoid composition is discussed. | | | |
Reference
| Z. Naturforsch. 43c, 418—422 (1988); received December 7 1987/January 26 1988 | | | |
Published
| 1988 | | | |
Keywords
| Pyridazinone Herbicides, Chromoplast Ultrastructures, Carotenoids | | | |
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| default:Reihe_C/43/ZNC-1988-43c-0418.pdf | | | | Identifier
| ZNC-1988-43c-0418 | | | | Volume
| 43 | |
| 2 | Author
| S. S. Brody | Requires cookie* | | | Title
| The Position of Carotene in the D-l/D-2 Sub-Core Complex of Photosystem II | | | | Abstract
| When the sub-core complex of photosystem II, D1/D2, is irradiated at 436 or 415 nm (absorp-tion by chlorophyll and pheophytin and ß-carotene) or 540 nm (absorption primarily by pheophy-tin), the low temperature fluorescence spectrum has two maxima, at 685 and 674 nm. This shows the existence of at least two different fluorescent forms of chlorophyll (chlorophyll a and perhaps pheophytin a). When carotene is irradiated at 485 nm (absorption primarily by ß-carotene), only fluorescence at 685 nm is observed: this indicates that carotene is transferring energy to only the long-wavelength form of chlorophyll in the D1/D2 sub-core complex. The band of carotene (at 485 nm) does not appear in the fluorescence excitation spectrum, measured at 674 nm. The position of the carotene molecule relative to each of the fluorescent forms of chlorophyll was determined from the excitation spectra of each of the fluorescence bands. | | | |
Reference
| Z. Naturforsch. 43c, 226—230 (1988); received August 21. 1987/January 11 1988 | | | |
Published
| 1988 | | | |
Keywords
| Photosynthesis Photosystem II, Chlorophyll, Fluorescence, Carotenoids, Energy Transfer | | | |
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| default:Reihe_C/43/ZNC-1988-43c-0226.pdf | | | | Identifier
| ZNC-1988-43c-0226 | | | | Volume
| 43 | |
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