Rapid and semi-automated leaf net photosynthetic rate determination for numerous phosphor-converted white-LED lights of different spectral distributions

AbstractA well-developed canopy structure can increase the biomass accumulation and yield of crops. Peanut seeds were sown in a soil inoculated with an arbuscular mycorrhizal fungus (AMF) and uninoculated controls were also sown. Canopy structure was monitored using a 3-D laser scanner and photosynthetic characteristics with an LI-6400 XT photosynthesis system after 30, 45 and 70 days of growth to explore the effects of the AMF on growth, canopy structure and photosynthetic characteristics and yield. The AMF colonized the roots and AMF inoculation significantly increased the height, canopy width and total leaf area of the host plants and improved canopy structure. AMF reduced the tiller angle of the upper and middle canopy layers, increased that of the lower layer, reduced the leaf inclination of the upper, middle and lower layers, and increased the average leaf area and leaf area index after 45 days of growth, producing a well-developed and hierarchical canopy. Moreover, AMF inoculation increased the net photosynthetic rate in the upper, middle and lower layers. Plant height, canopy width, and total leaf area were positively correlated with net photosynthetic rate, and the inclination angle and tiller angle of the upper leaves were negatively correlated with net photosynthetic rate. Overall, the results demonstrate the effects of AMF inoculation on plant canopy structure and net photosynthetic rate.

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Effects of photosynthetic photon flux density, frequency, duty ratio, and their interactions on net photosynthetic rate of cos lettuce leaves under pulsed light: explanation based on photosynthetic-intermediate pool dynamics

Photosynthesis Research ◽

10.1007/s11120-017-0470-z ◽

2017 ◽

Vol 136 (3) ◽

pp. 371-378 ◽

Cited By ~ 2

Author(s):

Tomohiro Jishi ◽

Ryo Matsuda ◽

Kazuhiro Fujiwara

Keyword(s):

Net Photosynthetic Rate ◽

Flux Density ◽

Photosynthetic Rate ◽

Photosynthetic Photon Flux Density ◽

Photon Flux ◽

Duty Ratio ◽

Photon Flux Density ◽

Pulsed Light ◽

Photosynthetic Photon Flux

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Relationships between net photosynthetic rate and secondary metabolite contents in St. John's wort

Plant Science ◽

10.1016/j.plantsci.2005.05.002 ◽

2005 ◽

Vol 169 (3) ◽

pp. 523-531 ◽

Cited By ~ 45

Author(s):

K. Mosaleeyanon ◽

S.M.A. Zobayed ◽

F. Afreen ◽

T. Kozai

Keyword(s):

Net Photosynthetic Rate ◽

Secondary Metabolite ◽

Photosynthetic Rate ◽

St John’S Wort ◽

St John's Wort

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Exogenously applied 20-hydroxyecdysone increases the net photosynthetic rate but does not affect the photosynthetic electron transport or the content of photosynthetic pigments in Tetragonia tetragonioides L.

Acta Physiologiae Plantarum ◽

10.1007/s11738-013-1379-6 ◽

2013 ◽

Vol 35 (12) ◽

pp. 3489-3495 ◽

Cited By ~ 7

Author(s):

Dana Holá ◽

Marie Kočová ◽

Olga Rothová ◽

Lenka Tůmová ◽

Marek Kamlar ◽

...

Keyword(s):

Electron Transport ◽

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Photosynthetic Pigments ◽

Photosynthetic Electron Transport ◽

Tetragonia Tetragonioides

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Leaf and community photosynthetic carbon assimilation of alpine plants under in-situ warming

10.21203/rs.3.rs-132375/v1 ◽

2020 ◽

Author(s):

Zhou Zijuan ◽

Su Peixi ◽

Wu Xiukun ◽

Shi Rui ◽

Ding Xinjing

Keyword(s):

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Climate Warming ◽

Alpine Meadow ◽

Carbon Assimilation ◽

Community Level ◽

Photosynthetic Carbon ◽

Leaf Level ◽

Photosynthetic Carbon Assimilation

Abstract Background: The Tibetan Plateau is highly sensitive to elevated temperatures and has experienced significant climate warming in the last decades. While climate warming is known to greatly impact alpine ecosystems, the gas exchange responses at the leaf and community levels to climate warming in alpine meadow ecosystems remain unclear.Results: In this study, the alpine grass, Elymus nutans, and forb, Potentilla anserina, were grown in open-top chambers (OTCs) for three consecutive years to evaluate their response to warming. Gas exchange measurements were used to assess the effects of in-situ warming on leaf- and community-level photosynthetic carbon assimilation based on leaf traits and photosynthetic physiological parameters. We introduced a means of up-scaling photosynthetic measurements from the leaf level to the community level based on six easily-measurable parameters, including leaf net photosynthetic rate, fresh leaf mass per unit leaf area, fresh weight of all plant leaves, the percentage of healthy leaves, the percentage of received effective light by leaves in the community, and community coverage. The community-level photosynthetic carbon assimilation and productivity all increased with warming, and the net photosynthetic rate at the leaf level was significantly higher than at the community level. Under elevated temperature, the net photosynthetic rate of E. nutans decreased, while that of P. anserina increased.Conclusions: These results indicated that climate warming may significantly influence plant carbon assimilation, which could alter alpine meadow community composition in the future.

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Doses of Osmocote® in the acclimatization of micropropagated plantlets of Anthurium maricense

Revista Agro mbiente On-line ◽

10.18227/1982-8470ragro.v13i0.5348 ◽

2019 ◽

Vol 13 ◽

pp. 14

Author(s):

Arlene Santisteban Campos ◽

Guilherme Vieira Do Bomfim ◽

Benito Moreira De Azevedo ◽

Carlos Alberto Kenji Taniguchi ◽

Ana Cristina Portugal Pinto de Carvalho

Keyword(s):

Survival Rate ◽

Net Photosynthetic Rate ◽

Photosynthetic Rate ◽

Slow Release ◽

Leaf Temperature ◽

Commercial Potential ◽

Slow Development ◽

Number Of Leaves ◽

Ornamental Species ◽

Different Doses

Anthurium maricense is a tropical ornamental species with great commercial potential in the areas of landscaping and potted foliage plants. One of the main obstacles in the production of micropropagated anthurium plantlets is its slow development and/or the low survival rate of the plantlets during the acclimatization stage. The use of slow-release fertilisers (SRF) can accelerate this process; however, there are no reports in the literature concerning this practice during acclimatization of micropropagated plantlets of this species. As such, in the present study, the effects of different doses of SRF on the development of micropropagated plantlets of Anthurium maricense were evaluated during the acclimatization stage in a screenhouse. The experiment was carried out in a completely randomised design, with five treatments and four replications of four plantlets per plot. The treatments comprised doses of 0.0, 2.5, 5.0, 7.5 and 10.0 kg m-3 of the SRF Osmocote® (NPK 15:9:12) added to the substrate. The variables under evaluation were the variation in plant height, in the number of leaves and in the area of the largest leaf, pot occupancy, net photosynthetic rate, internal carbon, and leaf temperature and moisture. The use of SRF promoted better development of the micropropagated plantlets of A. maricense during the acclimatization stage. Of the variables under analysis, the variation in the area of the largest leaf is the most important, since the commercial interest of the studied species is the foliage, which was at its maximum with an estimated dose of Osmocote® of 6.40 kg m-3.

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Response of in vitro Cultured Palm Oil Seedling Under Saline Condition to Elevated Carbon Dioxide and Photosynthetic Photon Flux Density

Annals of Tropical Research ◽

10.32945/atr3413.2012 ◽

2012 ◽

pp. 52-64

Author(s):

Pet Roey Pascual ◽

Krienkai Mosaleeyanon ◽

Kanokwan Romyanon ◽

Chalermpol Kirdmanee

Keyword(s):

Stomatal Conductance ◽

Net Photosynthetic Rate ◽

Elevated Co2 ◽

Photosynthetic Rate ◽

Transpiration Rate ◽

Pigment Contents ◽

Salinity Levels ◽

Oil Palms ◽

Ambient Co2

Salt stress elicits various physiological and growth responses of oil palm. A laboratory experiment was conducted to determine the responses of oil palms cultured in vitro under varying salinity levels (0, 85.5, 171.11, 342.21 and 684.43 mM NaCl) to elevated CO2 (1000 μmol CO2/mol) and PPFD (100±5 μmol m-2s-1) in terms of growth characteristics, pigment contents and photosynthetic abilities. After 14 days of culture, net photosynthetic rate (μmol CO2 m-2s-1) of oil palms across varying salinity levels was 5.33 times higher than those cultured under ambient CO, (380±100 Mmol CO2/mol) and PPFD (50±5 μmol m-2s -1). At increased net photosynthetic rate (elevated CO2 and PPFD), despite having no significant difference in pigment contents (chlorophyll a, chlorophyll b, total chlorophyll and carotenoid) between different CO2 and PPFD levels, dry weight and percent dry matter were 0.26 and 0.11 times higher, respectively, as compared to those cultured under ambient CO2 and PPFD. In the same elevated CO2 and PPFD level, across all salinity levels, stomatal conductance was 0.30 times lower than those cultured under ambient CO2 and PPFD. At reduced stomatal conductance (elevated CO2 and PPFD), transpiration rate was also reduced by 0.30 times. Thus with increased net photosynthetic rate and reduced transpiration rate, water use efficiency was increased by 7.22 times, across all salinity levels, than those cultured at ambient CO2 and PPFD. These were considered essential for NaCl produces iso-osmotic stress.

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