Light Intensity Influences Photosynthesis and Crop Characteristics of Jeffersonia dubia

Rhie, Yong Ha; Lee, Seung Youn; Jung, Hyun Hwan; Kim, Ki Sun

doi:10.7235/hort.2014.14028

Cited by 9 publications

(6 citation statements)

References 21 publications

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“…This may be the result of shoot biomass translocation because biomass in stem and leaves declined. In contrast, root biomass declined with the increase in shade level in species Fu_New_1 and Fu_New_2, which concurred with findings by (Rhie et al 2014).…”

Section: Discussionsupporting

confidence: 88%

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Shading effect on survival, growth, and contents of secondary metabolites in micropropagated Anoectochilus plantlets

et al. 2017

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Many Anoectochilus plants are now facing extinction; hence, they are propagated mainly from tissue culture. However, growth performance and secondary metabolites have not been fully identified on tissue-cultured plantlets from multiple Anoectochilus species under shading. In the present study, five Anoectochilus species [A. roxburghii (Wall.) Lindl., Fu_1; A. koshuaensis Hayata, Fu_2; A. formosanus Hayata, Tai; unidentified species of Fu_New_1 and Fu_New_2] were generated from micropropagated plantlets and cultured under shade treatments of three levels (mean light intensities: mild, *2000 Lx; medium, *800 Lx; intensive, *440 Lx) for five months. Among the five Anoectochilus species, the Tai and Fu_New_1 species had the highest survival rate and the Tai species had the best performance of stem morphology and foliar kaempferol content in the medium shade treatment, but it had fewer leaves and lower ratio of quercetin/ kaempferol than the Fu_1 species. The Fu_New_2 species had the greatest biomass accumulation and highest content of total flavonoids, especially under the mild shade treatment. Therefore, among the Anoectochilus species tested in this study, A. formosanus is suggested to be used in continuous propagation, A. roxburghii is suggested to be planted in stressed environment, and the new species of Fu_New_2 is suggested to be planted for the production of flavonoids. Mild and medium levels of shading are suggested to be used when biomass production and fast growing are needed for Anoectochilus plantlets, respectively.

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Section: Discussionsupporting

confidence: 88%

“…(Farhan et al 2012) and Jeffersonia dubia Benth Et. Hook (Rhie et al 2014). Other species showed improved tolerance to shade by increased number of leaves, shoot longevity, and shoot height, for example, in Aloe vera (L.) Burm.…”

Section: Introductionmentioning

confidence: 99%

Shading effect on survival, growth, and contents of secondary metabolites in micropropagated Anoectochilus plantlets

et al. 2017

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“…In a study by Miralles et al (2011), a decrease in light intensity by shading increased the shoot / root ratio of Rhamnus alternus. A phenomenon that could be explained by a reduction in evaporative demand under shaded conditions, affecting the water absorption needs, thereby possibly reducing the root growth (Rhie et al, 2014). It can therefore be expected that the relatively higher light intensity in our study would have influenced the water absorption demand and root growth.…”

Section: Resultsmentioning

confidence: 80%

Vegetative Growth Characteristics of Phalaenopsis and Doritaenopsis Plants under Different Artificial Lighting Sources

Lee¹,

An²,

Lee³

et al. 2017

HST

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This study was conducted to determine the effects of artificial lighting sources on vegetative growth of Phalaenopsis and Doritaenopsis (an intergeneric hybrid of Doritis and Phalaenopsis) orchids. One -month -old plants were cultivated under fluorescent lamps, cool -white lightemitting diodes (LEDs), or warm -white LEDs at 80 and 160 μmol·m -2 ·s -1 . The blue (400 -500 nm) : green (500 -600 nm) : red (600 -700 nm) : far -red (700 -800 nm) ratios of the fluorescent lamps, cool-white LEDs, and warm-white LEDs were 1 : 1.3 : 0.8 : 0.1, 1 : 1.3 : 0.6 : 0.1, and 1 : 2.7 : 2.3 : 0.4, respectively. Each light treatment was maintained for 16 weeks in a closed plant-production system maintained at 28°C with a 12 h photoperiod. The longest leaf span, as well as the leaf length and width of the uppermost mature leaf, were observed in plants treated with warm-white LEDs. Plants grown under fluorescent lamps had longer and wider leaves with a greater leaf span than plants grown under cool-white LEDs, while the maximum quantum efficiency of photosystem II was higher under cool-white LEDs. The vegetative responses affected by different lighting sources were similar at both 80 and 160 μmol·m -2 ·s -1 . Leaf span and root biomass were increased by the higher light intensity in both cultivars, while the relative chlorophyll content was decreased. These results indicate that relatively high intensity light can promote vegetative growth of young Phalaenopsis plants, and that warm -white LEDs, which contain a high red-light ratio, are a better lighting source for the growth of these plants than the cool-white LEDs or fluorescent lamps. These results could therefore be useful in the selection of artificial lighting to maximize vegetative growth of Phalaenopsis plants in a closed plant -production system.In conclusion, vegetative growth of Phalaenopsis plants was promoted by a higher light intensity.; however, since light requirements differ among cultivars, by plant age, or following different acclimation conditions, a more detailed study is needed to determine the optimum light intensity conditions. Warm -white LEDs that contain a high red -light ratio improved vegetative growth of 'Blanc Rouge' and 'Mantefon' plants, indicating that they are a better lighting source than cool -white LEDs or fluorescent lamps for vegetative growth of Phalaenopsis plants. The results of this study could therefore be useful in the selection of artificial lighting for use in closed plant-production systems in order to effectively promote vegetative growth of Phalaenopsis plants. Literature CitedAn SK, Kim YJ, Kim KS (2013) Optimum heating hour to maintain vegetative growth and inhibit premature inflorescence initiation of six-month and one-year-old Phalaenopsis hybrids. Hortic Environ Biotechnol 54:91-96. Anderson JM, Chow WS, Park YI (1995) The grand design of photosynthesis: acclimation of the photosynthetic apparatus to environmental cues. Photosynth Res 46:129-139.

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“…Generally, various environmental conditions affect plant growth, such as light, soil water content, temperature, and soil nutrients [23]. Among these, light is the most important environmental factor affecting plant establishment, growth, and survival [24,25].…”

Section: Introductionmentioning

confidence: 99%

Morpho-Physiological Strategies of Shorea leprosula Miq. and Shorea acuminata Dyer in Response to Light Intensity and Nutrient Amendments

Nurfaeiza

Juliana

Shamsul

et al. 2022

Forests

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Successfully restoring degraded forest areas depends on seedlings adapting their growth to suit harsh environments. Hence, the requirements for seedlings’ growth need to be addressed before replanting degraded sites. The present study determines the effect of abiotic factors viz. light irradiance (8%, 30%, and 100%), nutrient addition (no fertiliser (NF), NPK, and vermicompost) on the growth performance and photosynthetic capacity of two dipterocarp species seedlings, Shorea leprosula Miq. and Shorea acuminata Dyer. The morphological characteristics assessed for growth performance comprised plant height, stem diameter, leaf count, leaf area, relative chlorophyll concentration, biomass, and root-to-shoot ratio. Li-Cor 6400 and 6800 were used to measure the leaf gas exchange traits, including photosynthetic rate (A), transpiration rate (E), intercellular CO2 concentration (Ci), stomatal conductance (gsw), and water-use efficiency (WUE). Our results demonstrated that different levels of light intensity and nutrient amendment significantly impacted plant-growth performance. Plants grown in 30% irradiance showed better growth performance in terms of relative height growth rate (RHGR), mean number of leaves, and leaf areas 41%, 24%, and 32% higher than the control. The A value was also higher in 30% irradiance, but no significant differences were observed between each level of light irradiance. The addition of vermicompost gave better growth for RHGR, relative diameter growth rate (RDGR), mean number of leaves, biomass, and relative chlorophyll concentrations 47%, 40%, 131%, 19%, and 27% higher than the control, respectively. However, the results obtained for photosynthetic parameters were contrary to growth performance. The photosynthesis rate (A) was higher (14.8%) in NPK compared to the control, and the other photosynthetic parameters did not differ significantly despite different nutrient amendments. In terms of species, S. leprosula has better growth performance and photosynthetic characteristics than S. acuminata in different light irradiance and nutrient amendments, thereby rendering S. leprosula the preferred rehabilitation species. Generally, nutrient addition of either NPK or vermicompost and 30% light irradiance gave better morphological and physiological growth for both species. The outcome of this study could provide a better understanding on the forest rehabilitation strategy to reduce the seedling-mortality rate, particularly for climax tree species.

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Light Intensity Influences Photosynthesis and Crop Characteristics of Jeffersonia dubia

Cited by 9 publications

References 21 publications

Shading effect on survival, growth, and contents of secondary metabolites in micropropagated Anoectochilus plantlets

Shading effect on survival, growth, and contents of secondary metabolites in micropropagated Anoectochilus plantlets

Vegetative Growth Characteristics of Phalaenopsis and Doritaenopsis Plants under Different Artificial Lighting Sources

Morpho-Physiological Strategies of Shorea leprosula Miq. and Shorea acuminata Dyer in Response to Light Intensity and Nutrient Amendments

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