Abstract
The effect of different light qualities (blue, green, white, red and far-red) on ethylene production in leaf discs and flower petal discs of Begonia × hiemalis cv. Schwabenland Red was studied. All the light qualities, except far-red, reduced the ACC-conversion to ethylene in leaf discs by about 70% at a photosynthetic photon flux density (PPFD) of 20 μmol m−2s−1.
Blue and green light were less inhibitory than white and red light at lower PPFD. In all treatments far-red light at 0.5 μmol m−2s−1 of photon flux density (PFD) stimulated the ACC-conversion to ethylene in leaf discs by about 60–90% compared to the dark-incubated control. White and red light strongly inhibited the α-naphthalene-acetic acid (NAA) stimulated ethylene synthesis in leaf discs. The results may suggest that the ethylene production is controlled by phytochrome in the leaves but not in the petals. Lack of coaction of any light quality with silver ions on ethylene production in leaf and petal discs was also observed.
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Abbreviations
- ACC:
-
1-aminocyclopropane-1-carboxylic acid
- EFE:
-
ethylene forming enzyme
- NAA:
-
α-naphthalene-acetic acid
- PFD:
-
photon flux density
- PPFD:
-
photosynthetic photon flux density
- RH:
-
relative air humidity
- SAM:
-
S-adenosylmethionine
- STS:
-
silver thiosulphate
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Rudnicki, R.M., Fjeld, T. & Moe, R. Effect of light quality on ethylene formation in leaf and petal discs of Begonia × hiemalis Fotsch cv. Schwabenland Red. Plant Growth Regul 13, 281–286 (1993). https://doi.org/10.1007/BF00024849
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DOI: https://doi.org/10.1007/BF00024849