High Pressure Sodium Irradiation and Infrared Radiation Accelerate Petunia Seedling Growth

Graper, David; Healy, Will

doi:10.21273/jashs.116.3.435

Cited by 19 publications

(12 citation statements)

References 8 publications

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“…Developmental rates, including leaf unfolding, are influenced by temperature. SL increased root zone and leaf temperature (Graper and Healy, 1991) and shoot-tip temperature of plants (Faust and Heins, 1997). In Season I of this study, HPS lighting at 90 mmolÁm -2 Ás -1 increased media temperature by 2.4°C, which may partially explain the acceleration of germination by %1 d (data not shown).…”

Section: Discussionmentioning

confidence: 60%

“…Faust and Heins (1997) reported that Catharanthus roseus exposed to supplemental light from HPS lamps at 50, 75, and 100 mmolÁm -2 Ás -1 were 1.2, 1.5, and 1.7°C warmer, respectively, than plants in darkness. HPS SL for 24 h at 160 mmolÁm -2 Ás -1 increased media and plant temperature by 3.6 and 4.3°C, respectively, and the fresh weight of petunia seedlings by 88% at 12 d after treatment (Graper and Healy, 1991). Elevating media and plant temperature (+3.6 and +4.8°C, respectively) without increasing the PPF by using infrared (IR) lamps increased fresh weight by 38%, and HPS lighting removing IR radiation increased fresh weight by 68%, elevating media and leaf temperature by 2.0 and 2.5°C, respectively.…”

Section: Discussionmentioning

confidence: 97%

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Timing and Duration of Supplemental Lighting during the Seedling Stage Influence Quality and Flowering in Petunia and Pansy

Oh¹,

Runkle²,

Warner³

2010

horts

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Increasing the photosynthetic daily light integral (DLI) during the seedling stage promotes seedling growth and flowering in many bedding plants. Our objective was to determine the impact of increased DLI for different periods during the seedling stage on young plant quality and subsequent growth and development. Seeds of petunia (Petunia ×hybrida Vilm.-Andr. ‘Madness Red’) and pansy (Viola ×wittrockiana Gams. ‘Delta Premium Yellow’) were sown into 288-cell plug trays and placed under a 16-h photoperiod provided by sunlight plus 90 μmol·m−2·s−1 [supplemental lighting (SL)] or 3 μmol·m−2·s−1 [photoperiodic lighting (PL)] from high-pressure sodium lamps when the ambient greenhouse photosynthetic photon flux was less than 400 μmol·m−2·s−1 from 0600 to 2200 hr. Plants were grown at 20 °C under PL or SL for the entire seedling stage or were exposed to SL for one-third or two-thirds of the seedling stage. Seedlings were then transplanted into 10-cm pots and grown until flowering with SL at 20 °C. Shoot dry mass of transplants increased linearly with increasing DLI provided to seedlings in petunia (y = −4.75 + 1.86x, R2 = 0.76) and pansy (y = −3.94 + 3.47x, R2 = 0.78) in which y = dry mass (g) and x = DLI (mol·m−2·d−1). SL during the last two-thirds or the entire plug stage increased shoot dry mass and the number of leaves in both species compared with SL during the earlier stage or PL. SL during the last two-thirds or the entire plug stage accelerated flowering, but plants had a lower shoot dry mass and flower bud number at first flowering compared with that in SL during the first third or two-thirds or that in PL. Therefore, SL generally had greater effects on transplant quality and subsequent flowering when provided later in the plug stage than if provided earlier in production.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 97%

Timing and Duration of Supplemental Lighting during the Seedling Stage Influence Quality and Flowering in Petunia and Pansy

Oh¹,

Runkle²,

Warner³

2010

horts

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“…Biomass accumulation in seedling-plant or rooted cuttings of annual bedding plants tends to be positively correlated with light intensity or daily light integral (DLI) levels during propagation [18,19]. Growth and quality of rooted cuttings of the herbaceous annual plants can be increased by increasing the DLI after callusing under a DLI of 5 mol m −2 d −1 [20,21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Light Intensity on Rooting and Growth of Hydroponic Strawberry Runner Plants in a LED Plant Factory

Zheng

et al. 2019

Agronomy

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To rapidly produce strawberry (Fragaria × ananassa Duch. cv. Benihoppe) transplants from cuttings, suitable light intensities for unrooted runner plants at the rooting stage and rooted runner plants at the seedling stage were determined in a plant factory under LED lighting. At the rooting stage, unrooted runner plants at the 3-leaf stage were hydroponically rooted for 6 days under light intensity of 30, 90, 150, and 210 µmol m −2 s −1 , respectively. At the seedling stage, rooted runner plants were hydroponically grown for 18 days under light intensity of 90, 180, 270, and 360 µmol m −2 s −1 , respectively. The tube LED lights consisting of white and red LED chips were used as sole light source, and photoperiod was controlled as 16 h d −1 . The results showed that the maximum root number (7.7) and longest root length (14.8 cm) of the runner plants were found under 90 µmol m −2 s −1 at the rooting stage. Photosynthetic activity in runner plant leaves under 90 µmol m −2 s −1 were higher than that under 30, 150, and 210 µmol m −2 s −1 . Higher light intensity at the range of 90-270 µmol m −2 s −1 increased the stomatal conductance of newly formed leaves of rooted runner plants, thus improving the net photosynthetic rate and growth of rooted runner plants at the seedling stage. The crown diameter, shoot and root dry weights, and root to shoot ratio of rooted runner plants increased by 9.7%, 38.8%, 106.1%, and 48.7%, respectively, when the light intensity increased from 90 to 270 µmol m −2 s −1 . However, there was no further improvement of runner plant growth under 360 µmol m −2 s −1 . Furthermore, no significant difference of increased dry biomass per mole of photons delivered was found between 180 and 270 µmol m −2 s −1 . In consideration of transplant quality and economic balance, light intensity of 90 µmol m −2 s −1 at the rooting stage and 270 µmol m −2 s −1 at the seedling stage were suggested for rapidly producing hydroponic strawberry transplants based on unrooted runner plants in the LED plant factory.

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“…Whereas increasing DLI increased the leaf number of cilantro and dill, and EC had no effect, nutrient solution EC interacted with DLI to affect the unfolded leaf number for parsley. Temperature increases with increased radiation [20], especially with high-pressure sodium lamps [21,22], which were used in this experiment. Though plant temperatures were not measured in the present study, the minimal increase in leaf number with increasing DLI for dill and parsley could likely be attributed to this effect.…”

Section: Discussionmentioning

confidence: 99%

Nutrient Solution Strength Does Not Interact with the Daily Light Integral to Affect Hydroponic Cilantro, Dill, and Parsley Growth and Tissue Mineral Nutrient Concentrations

2019

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Our objectives were to quantify the growth and tissue mineral nutrient concentrations of cilantro (Coriandrum sativum 'Santo'), dill (Anethum graveolens 'Fernleaf'), and parsley (Petroselinum crispum 'Giant of Italy') in response to nutrient solution electrical conductivity (EC) under low and high photosynthetic daily light integrals (DLI). Three-week old seedlings of cilantro, dill, and parsley were transplanted into nutrient-film technique hydroponic systems with one of five nutrient solution EC treatments (0.5, 1.0, 2.0, 3.0, or 4.0 dS·m −1 ) in greenhouses under a low (~7.0 mol·m −2 ·d −1 ) or high (~18.0 mol·m −2 ·d −1 ) DLI. The DLI, but not nutrient solution EC, affected culinary herb growth. For example, fresh mass increased by 21.0 (154%), 17.1 (241%), or 13.3 g (120%) for cilantro, dill, and parsley, respectively, for plants grown under high DLI compared to those grown under a low DLI; dry mass followed a similar trend. Tissue nutrient concentrations were generally affected by either DLI or EC. For those nutrients affected by DLI, concentrations increased with increasing DLI, except for potassium (K; all species) and manganese (Mn; dill). For those nutrients affected by EC, Ca and Mg decreased with increasing EC, while the remaining increased with increasing EC. When our tissue nutrient data are compared to recommended tissue concentrations, the vast majority of elements were either within or above recommended tissue ranges for cilantro, dill, and parsley. Our results demonstrate cilantro, dill, and parsley can be successfully grown across a range of EC, regardless of the light intensity of the growing environment.

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High Pressure Sodium Irradiation and Infrared Radiation Accelerate Petunia Seedling Growth

Cited by 19 publications

References 8 publications

Timing and Duration of Supplemental Lighting during the Seedling Stage Influence Quality and Flowering in Petunia and Pansy

Timing and Duration of Supplemental Lighting during the Seedling Stage Influence Quality and Flowering in Petunia and Pansy

Effect of Light Intensity on Rooting and Growth of Hydroponic Strawberry Runner Plants in a LED Plant Factory

Nutrient Solution Strength Does Not Interact with the Daily Light Integral to Affect Hydroponic Cilantro, Dill, and Parsley Growth and Tissue Mineral Nutrient Concentrations

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