Flowering and Photosynthetic Responses of Phalaenopsis under Elevated CO2 and Nutrient Supply

Cho, Ah Ram; Choi, Sun Hee; Kim, Yoon Jin

doi:10.7235/hort.20200055

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…Plants that have high water content will cause them to be susceptible to pathogen attack (Firgiyanto et al, 2016). According to Cho et al (2020) bacteria or pathogens that attack plants can grow rapidly following the flow of water.…”

Section: Resultsmentioning

confidence: 99%

Study of Resistance on Orchids Induced Rhizoctonia to ORSV Based on Secondary Metabolite Analysis

Mahfut,

Aryani,

Handayani

et al. 2022

tjp

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Dendrobium discolor and Phalaenopsis amabilis are in high demand because of their beautiful shape, color, texture, and flower arrangement. The current obstacle to orchid cultivation is infection with Odontoglossum ringspot virus (ORSV). One of the efficient ways to control the infection of this pathogen and does not cause an impact on the environment is to use Rhizoctonia mycorrhizae. Mycorrhizal relationship with plants will form induced resistance. Plants resulting from induced resistance will induce secondary metabolite, namely peroxidase enzymes. This type of secondary metabolites will prevent the growth and development of pathogens and plants become resistant to pathogenic infections. The purpose of this study was to determine differences in peroxidase enzyme activity and differences in resistance to P. amabilis and D. discolor after Rhizoctonia induction against ORSV infection. This research was carried out in several stages, namely plantlet preparation, mycorrhizal inoculation, mycorrhizal inoculation, and peroxidase enzyme activity analysis using a UV Vis spectrometer at a wavelength of 420 nm. The results showed that D. discolor had a higher peroxidase enzyme activity than P. amabilis. In the treatment application factor, the peroxidase enzyme activity was the highest in the Mycorrhizal Virus treatment compared to the Mycorrhizal and Virus treatments. This study showed that D. discolor was more resistant to ORSV infection than P. amabilis. and the application of Mycorrhizae proved to be successful in increasing the activity of the peroxidase enzyme as a response to plant protection against viral infections.

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Section: Resultsmentioning

confidence: 99%

Study of Resistance on Orchids Induced Rhizoctonia to ORSV Based on Secondary Metabolite Analysis

Mahfut,

Aryani,

Handayani

et al. 2022

tjp

View full text Add to dashboard Cite

show abstract

Analysis of Spatial and Vertical Variability of Environmental Parameters in a Greenhouse and Comparison of Carbon Dioxide Concentration in Two Different Types of Greenhouses

et al. 2022

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This study was aimed to investigate spatial and vertical characteristics of greenhouse environments according to the location of the environmental sensors, and to investigate the correlations between temperature, light intensity, and carbon dioxide (CO 2 ) concentration according to the type of greenhouse. Temperature, relative humidity (RH), CO 2 , and light sensors were installed in the four-different vertical positions of the whole canopy as well as ground and roof space at the five spatial locations of the Venlo greenhouse. Also, correlations between temperature, light intensity, and CO 2 concentration in Venlo and semi-closed greenhouses were analyzed using the Curve Expert Professional program. The deviations among the spatial locations were larger in the CO 2 concentration than other environmental factors in the Venlo greenhouse. The average CO 2 concentration ranged from 465 to 761 µmol•mol -1 with the highest value (646 µmol•mol -1 ) at the Middle End (4ME) close to the main pipe (50∅) of the liquefied CO 2 gas supply and lowest (436 µmol•mol -1 ) at the Left Middle (5LM). The deviation among the vertical positions was greater in temperature and relative humidity than other environments. The time zone with the largest deviation in average temperature was 2 p.m. with the highest temperature (26.51°C) at the Upper Air (UA) and the lowest temperature (25.62°C) at the Lower Canopy (LC). The time zone with the largest deviation in average RH was 1 p.m. with the highest RH (76.90%) at the LC and the lowest RH (71.74%) at the UA. The highest average CO 2 concentration at each hour was Roof Air (RF) and Ground (GD). The coefficient of correlations between temperature, light intensity, and CO 2 concentration were 0.07 for semi-closed greenhouse and 0.66 for Venlo greenhouse. All the results indicate that while the CO 2 concentration in the greenhouse needs to be analyzed in the spatial locations, temperature and humidity needs to be analyzed in the vertical positions of canopy. The target CO 2 fertilization concentration for the semi-closed greenhouse with low ventilation rate should be different from that of general greenhouses.

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Comparing Net CO2 Uptake of Schlumbergera truncata ‘Pink Dew’ Phylloclades in a Growth Chamber and a Greenhouse

2023

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Crassulacean acid metabolism (CAM) plants use surplus CO 2 generated by cooling and heating at night when ventilation is not needed in a greenhouse. Schlumbergera truncata 'Pink Dew' is a multi-flowering cactus that needs more phylloclades for high-quality production. This study examined photosynthetic characteristics by the phylloclade levels of S. truncata in a growth chamber and a greenhouse for use of night CO 2 enrichment. The CO 2 uptake rate of the S. truncata's top phylloclade in a growth chamber exhibited a C 3 pattern, and the second phylloclade exhibited a C 3 -CAM pattern. The CO 2 uptake rate of the top phylloclade in a greenhouse showed a negative value both day and night, but those of the second phylloclade exhibited a CAM pattern. The stomatal conductance and water-use efficiency (WUE) of S. truncata at both the top and second phylloclades were higher in a growth chamber than in a greenhouse. The WUE of S. truncata in a growth chamber and a greenhouse was higher at the second phylloclade, which is a CAM pattern compared with those of the top phylloclade. The daily total net CO 2 uptake of S. truncata was higher in a growth chamber than in a greenhouse. The daily total net CO 2 uptake of S. truncata at the second phylloclade had the highest value of 155 mmol•m -2 •d -1 in a growth chamber. The night total CO 2 uptake of S. truncata at the second phylloclade was 3-fold higher in a growth chamber than in a greenhouse. S. truncata's second phylloclade exhibited a CAM pattern that uptake CO 2 at night, and the second phylloclade, was more mature than the top phylloclade. A multi-flowering cactus S. truncata 'Pink Dew' efficiently uptake night surplus CO 2 in the proper environmental condition with matured phylloclade.

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Flowering and Photosynthetic Responses of Phalaenopsis under Elevated CO2 and Nutrient Supply

Cited by 3 publications

References 35 publications

Study of Resistance on Orchids Induced Rhizoctonia to ORSV Based on Secondary Metabolite Analysis

Study of Resistance on Orchids Induced Rhizoctonia to ORSV Based on Secondary Metabolite Analysis

Analysis of Spatial and Vertical Variability of Environmental Parameters in a Greenhouse and Comparison of Carbon Dioxide Concentration in Two Different Types of Greenhouses

Comparing Net CO2 Uptake of Schlumbergera truncata ‘Pink Dew’ Phylloclades in a Growth Chamber and a Greenhouse

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