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Geoffrey Weaver and Marc W. van Iersel

Supplemental lighting can improve the profitability of greenhouse crop production, and a better quantitative understanding of plant responses to PPFD can facilitate the development of more efficient crop-specific control strategies for greenhouse

Open access

Celina Gómez, Megha Poudel, Matias Yegros, and Paul R. Fisher

INCR, had shorter stems than those acclimated in CGH at week 8. In both harvest weeks, shoot DM increased in response to PPFD ( Fig. 1C ). At week 4, transplants acclimated under PPFDs of 105 or 140 µmol·m ‒2 ·s ‒1 had a similar shoot DM, which was 47

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Toshio Shibuya, Ryosuke Endo, Yuki Kitamura, Yoshiaki Kitaya, and Nobuaki Hayashi

seedlings does not affect the photosynthetic light response. The seedlings was grown under FL H or FL L for 4, 6, and 8 d after the cotyledons had fully expanded, and then P n of them was measured at a PPFD of 1000 μmol·m −2 ·s −1 . Measuring methods

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Soohyun Kang, Yating Zhang, Yuqi Zhang, Jie Zou, Qichang Yang, and Tao Li

where the background PPFD is often far less than the saturation intensity. This study aims at exploring how plant growth responds to additional UV-A radiation in a controlled environment and whether plant growth exhibits a dose response under UV-A

Open access

Zhengnan Yan, Long Wang, Jiaxi Dai, Yufeng Liu, Duo Lin, and Yanjie Yang

PPFD or DLI environment. A relatively large canopy was beneficial for intercepting light efficiently in plant growth ( Elkins and van Iersel, 2020a ). Lower PPFD with longer photoperiod did not lead to a shade-avoidance response, based on the leaf

Open access

Claudia Elkins and Marc W. van Iersel

cropping cycles of ornamental plants grown in controlled environments. One approach to enhancing growth is to include far-red light (λ = 700–800 nm) in the spectrum because 1) far-red light can trigger a shade-avoidance and/or acclimation response

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Qiansheng Li, Min Deng, Jianjun Chen, and Richard J. Henny

:1:1 ratio based on volume. Potted plants were grown in a shaded greenhouse under three daily maximum photosynthetic photon flux densities ( PPFD ) of 285, 350, and 550 μmol·m −2 ·s −1 , which resulted from the installation of shadecloth with three different

Open access

Claudia Elkins and Marc W. van Iersel

.23, 26% higher than that of the plants without supplemental light (0.17). Plant height increased linearly from 12.8 to 14.6 cm (14%) as photoperiods increased from 12 to 21 h ( Fig. 4A ). This suggests plants elongated as a shade response to lower PPFD

Open access

Qinglu Ying, Yun Kong, and Youbin Zheng

eliciting shade-avoidance responses through phytochromes ( Park and Runkle, 2017 ). Under a background lighting with BR (20% B and 80% R; B 20 R 80 ) at a PPFD of 130 µmol·m −2 ·s −1 , adding FR with increased levels from ≈12 to 149 µmol·m −2 ·s −1 (i

Open access

Chase Jones-Baumgardt, David Llewellyn, and Youbin Zheng

radiation ( PAR ) a crop received [i.e., total light integral (TLI); mol·m −2 ] in the literature, particularly in greenhouse environments, due to incomplete descriptions of the canopy-level PPFD from natural and/or supplemental sources. Although TLI [also