Circadian clock component, LHY, tells a plant when to respond photosynthetically to light in nature(FA)

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The circadian clock is known to increase plant growth and fitness, and is thought to prepare plants for photosynthesis at dawn and dusk; whether this happens in nature was unknown. We transformed the native tobacco, Nicotiana attenuata to silence two core clock components, NaLHY (irLHY) and NaTOC1 (irTOC1). We characterized growth and light- and dark-adapted photosynthetic rates (Ac) throughout a 24 h day in empty vector-transformed (EV), irLHY, and irTOC1 plants in the field, and in NaPhyA- and NaPhyB1-silenced plants in the glasshouse. The growth rates of irLHY plants were lower than those of EV plants in the field. While irLHY plants reduced Ac earlier at dusk, no differences between irLHY and EV plants were observed at dawn in the field. irLHY, but not EV plants, responded to light in the night by rapidly increasing Ac. Under controlled conditions, EV plants rapidly increased Ac in the day compared to dark-adapted plants at night; irLHY plants lost these time-dependent responses. The role of NaLHY in gating photosynthesis is independent of the light-dependent reactions and red light perceived by NaPhyA, but not NaPhyB1. In summary, the circadian clock allows plants not to respond photosynthetically to light at night by anticipating and gating red light-mediated in native tobacco. © 2017 Institute of Botany, Chinese Academy of Sciences
Publisher
WILEY-BLACKWELL
Issue Date
2017-08
Language
English
Article Type
Article
Keywords

AGROBACTERIUM-MEDIATED TRANSFORMATION; A/B BINDING-PROTEINS; NICOTIANA-ATTENUATA; PHYTOCHROME-A; ARABIDOPSIS-THALIANA; FIELD CONDITIONS; BLUE-LIGHT; WATER-USE; RHYTHMS; TRANSCRIPTION

Citation

JOURNAL OF INTEGRATIVE PLANT BIOLOGY, v.59, no.8, pp.572 - 587

ISSN
1672-9072
DOI
10.1111/jipb.12547
URI
http://hdl.handle.net/10203/226928
Appears in Collection
BS-Journal Papers(저널논문)
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