Photosynthetica 1999, 36(3):361-373 | DOI: 10.1023/A:1007099901386

Changes in the Pools of Carotenoids and Protochlorophyll(ide) in Etiolated Cucumber (Cucumis Sativus) Cotyledons Treated with Norflurazon and KC 6361

S. Jung, J.S. Kim, K.Y. Cho, B.G. Kang

Changes in the pools of carotenoids and protochlorophyll(ide) were investigated in etiolated cucumber cotyledons treated with norflurazon (NF) and an experimental herbicide KC 6361 (KC). Both the NF- and the KC-treated tissues considerably accumulated the colourless carotenes phytoene and phytofluene with a concomitant depletion of the coloured carotenoids lutein and β-carotene in darkness. However, the profiles of changes in chlorophylls (Chls) and carotenoids were different for the two herbicides. The plants were also influenced by the photosynthetic photon flux densities (PPFD's), with a more pronounced decline of Chl under high PPFD than under low PPFD. The ratios of protochlorophyll (PChl)/protochlorophyllide (PChlide) were greatly altered due to a decrease and an increase of PChl in the NF- and the KC-treated etiolated tissues, respectively, whereas the PChlide content was not significantly influenced by the inhibitors. Large increase of PChls in the KC-treated tissues seems to derive from the binding of accumulated geranylgeraniol (GG) equivalents, through carotenogenic inhibition, to PChlide. Therefore, the alterations of PChl and PChlide occurring under disturbed carotenogenesis may suggest an interaction between the biosynthetic pathways of Chls and carotenoids. In addition, the great proportion of PChl GG and PChl dihydro-GG in the KC-treated tissues implies that PChl formation is regulated at the level of hydrogenation.

Additional key words: 5-aminolevulinic acid; β-carotene; carotenogenesis; irradiance; photosynthetic photon flux density; phytol; protochlorophyll; xanthophylls

Published: August 1, 1999  Show citation

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Jung, S., Kim, J.S., Cho, K.Y., & Kang, B.G. (1999). Changes in the Pools of Carotenoids and Protochlorophyll(ide) in Etiolated Cucumber (Cucumis Sativus) Cotyledons Treated with Norflurazon and KC 6361. Photosynthetica, 36(3), 361-373. doi: 10.1023/A:1007099901386
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