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Shuyang Zhen and Marc W. van Iersel

-adapted plant Heuchera americana when supplemental light was provided at the same ambient PPF ( van Iersel and Gianino, 2017 ). In addition to adaptation, short-term acclimation to light, typically taking place within minutes to weeks (within the life cycle

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Krishna S. Nemali and Marc W. van Iersel

Physiological acclimation of plants to light has been studied mostly at the leaf level; however whole-plant responses are more relevant in relation to crop growth. To examine the physiological changes associated with different daily light integrals (DLI) during growth of wax begonia (Begonia semperflorens-cultorum Hort.), we grew plants under DLI of 5.3, 9.5, 14.4, and 19.4 mol·m-2·d-1 in a whole-plant gas exchange system. Photosynthesis-light response curves of groups of 12 plants were determined after 25 d of growth. Physiological parameters were estimated per m2 ground area and per m2 leaf area. On a ground area basis, significant increases in dark respiration (Rd), quantum yield (α), the light compensation point (LCP), and maximum gross photosynthesis (Pg,max) were seen with increasing DLI. Variations in physiological parameters among different treatments were small when corrected for differences in leaf area. On a leaf area basis, α, LCP, and the light saturation point (LSP) did not change significantly, whereas significant increases in Rd and Pg,max were seen with increasing DLI. There was a small decrease in leaf chlorophyll concentration (6.3%, measured in SPAD units) with increasing DLI. This study indicates that wax begonias acclimate to low DLI by increasing their leaf chlorophyll concentration, presumably to more efficiently capture the available light, and to high DLI by increasing Pg,max to efficiently utilize the available light, thereby maximizing carbon gain under both situations.

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Heidi M. Wollaeger and Erik S. Runkle

Blue (B; 400–500 nm) and red (R; 600–700 nm) light are generally considered the most efficient wavelengths for eliciting photosynthesis in plants ( McCree, 1972 ; Sager et al., 1988 ). Therefore, B and R LEDs with peak light emission that coincides

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Milton E. Tignor Jr. and Russell L. Weiser

Alaska peas (Pisum sativum `Alaska') were germinated in the dark at 25C. After three days, when the shoots were approx. 1.5 cm, treatments were initiated. ABA, at 10-4M, was exogenously applied through the root solution. The control peas remained in distilled water. All treatments involving the application of ABA were applied under green safe light. Light treatments were applied using overhead fluorescent lights for designated timed intervals (0 to 20 min) over 3 days. A methanol bath was then used to induce freezing stresses from 0 to -9C. The combination treatment of light and ABA had the lowest LT50 (more cold tolerant) followed by light, dark, and dark with ABA (least cold tolerant). Extensin levels, plant growth, and stem bendability were also recorded.

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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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Evagelini Kitta, Nikolaos Katsoulas, Anna Kandila, Maria M. González-Real, and Alain Baille

acclimation of leaf physiological function, stressed the close relationship between the distribution of photosynthetic traits and the local light regime in species grown in the open field ( Field and Mooney, 1986 ; Niinemets et al., 2004 ) and under

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Rajeev Arora and Lisa J. Rowland

) suggests that an enhanced ability of leaves to protect chloroplast from excess light may be one of the key components of a multifactorial cold acclimation process in evergreen rhododendrons. Others have also reported an accumulation of Elip proteins in

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Smita Barkataky, Robert C. Ebel, Kelly T. Morgan, and Keri Dansereau

, E, G ) and Citrus unshiu ( B, D, F, H ) during cold acclimation. Temperatures of the cold acclimation treatment are shown at the top of the figure (°C) during the light (12 h) and dark (12 h) cycles. Cold acclimation increased R root by six times

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Shu Hsien Hung, Chun Chi Wang, Sergei Veselinov Ivanov, Vera Alexieva, and Chih Wen Yu

the agricultural losses due to chilling. In this investigation, we report that multiple H 2 O 2 treatments induce a chilling tolerance comparable to cold acclimation in mung bean seedlings. However, in their response to light, the mechanisms of H 2 O

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Jiunn-Yan Hou, Tim L. Setter, and Yao-Chien Alex Chang

various PPF as indicated after the simulated dark shipping. Bars indicate se (n = 7). With increasing light intensity being provided, SPAD values of shipped plants declined and L, a, and b values increased after 15 d of light acclimation