期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 155, 期 -, 页码 206-216出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2018.06.033
关键词
Far-red radiation; Photosynthetic photon flux density; Phytochrome; Red to far-red ratio; Shade-avoidance; Sole-source lighting
资金
- Osram Opto Semiconductors
- USDA-ARS Floriculture and Nursery Research Initiative
- USDA National Institute of Food and Agriculture, Hatch project [192266]
- Michigan State University's (MSU) AgBioResearch and Project GREEEN
Shade-avoidance responses can be triggered by a decrease in the red (R, 600-700 nm) to far-red (FR, 700-800 nm) radiation ratio, by a decrease in photosynthetic photon flux density (PPFD), or both. The effects of decreased PPFD on plant responses are often confounded with the effects of reduced blue (B, 400-500 nm) photon flux density, which is another signaling factor for shade-avoidance responses. We postulated that PPFD would not influence R:FR-mediated shade-avoidance responses if B photon flux density was constant. We grew seedlings of petunia (Petunia x hybrida), geranium (Pelargonium x hortorum), and coleus (Solenostemon scutellariodes) under three R:FR (1:0, 2:1, and 1:1) at two PPFDs (96 and 288 mu mol m(-2) s(-1)), all with a B photon flux density of 32 mu mol m(-2) s(-1). As R:FR decreased, stem length in all species increased. Decreasing R:FR increased individual leaf area of petunia, and shoot dry weight of petunia and coleus. Increasing PPFD decreased chlorophyll concentration and increased leaf mass per area, net CO2 assimilation, whole-plant net assimilation, and dry weight in at least two species, independent of R:FR. In petunia, a long day plant, decreasing R:FR promoted subsequent flowering at both PPFDs, but to a greater extent under the lower PPFD. In day-neutral geranium, the addition of FR had no effect on flowering, irrespective of PPFD. We conclude that with a constant B photon flux density, decreases in R:FR promote stem elongation and leaf expansion, and subsequent dry mass accumulation, independent of PPFD. However, for flowering of long-day plant petunia, the promotive effect of low R:FR is greater under lower PPFD.
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