Journal
SCIENTIA HORTICULTURAE
Volume 97, Issue 2, Pages 153-162Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-4238(02)00141-3
Keywords
DIF; diurnal temperature alternation; thermomorphogenesis; chlorophyll; chlorophyll a/chlorophyll b ratio; Melissa; Ocimum; Viola
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DIF, defined as day temperature (DT) minus night temperature (NT), influences plant morphology in a wide range of species. A controlled climate experiment was conducted to elucidate whether negative DIF (-6 degreesC) or positive DIF ( -6 degreesC) treatments or a 2-h temperature drop or increase at different times during the day, would affect chlorophyll concentration in Melissa officinalis L. (lemon balm), Ocimum basilicum L. (basil) and Viola x wittrockiana Gams. (pansy). With negative DIF treatment, lower concentrations of chlorophyll a and chlorophyll b were observed in Melissa and Ocimum. The reduction in chlorophyll b was more pronounced than for chlorophyll a, resulting in a higher chlorophyll a/chlorophyll b ratio than in control plants (constant temperature). The results support the theory that DIF treatments may influence phytochrome controlled chlorophyll synthesis and chlorophyll a/chlorophyll b ratio in lemon balm and basil, but that 2 It is too short time or 6 degreesC DIF too little to produce the same effect. In Viola, DIF had no effect on leaf chlorophyll content, except for the first 2-h period of the day. (C) 2002 Elsevier Science B.V. All rights reserved.
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