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

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.

scholarly journals Growth and Net Photosynthetic Rate of Tomato Plantlets during Photoautotrophic and Photomixotrophic Micropropagation

HortScience ◽  
2001 ◽  
Vol 36 (1) ◽  
pp. 49-52 ◽  
Author(s):  
Chieri Kubota ◽  
Natsuko Kakizaki ◽  
Toyoki Kozai ◽  
Koichi Kasahara ◽  
Jun Nemoto
Keyword(s):  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Dry Weight ◽  
Ventilation Rate ◽  
Photon Flux ◽  
Leaf Removal ◽  
Photosynthetic Photon Flux ◽  
Photoautotrophic Micropropagation ◽  
Number Of Leaves

Nodal explants of tomato (Lycopersicon esculentum Mill.) were cultured in vitro to evaluate the effects of sugar concentration, photosynthetic photon flux (PPF), CO2 concentration, ventilation rate of the vessel, and leaf removal on growth and photosynthesis. After 20 days of culture, the dry weights of plantlets derived from explants with leaves and cultured photoautotrophically (without sugar in the medium) under high PPF, high CO2 concentration, and high ventilation rate were more than twice as great as those of plantlets derived conventionally from explants without leaves and cultured photomixotrophically (with sugar in the medium) under low PPF, low CO2 concentration, and low ventilation rate (107 and 45 mg per plantlet, respectively). Under photomixotrophic micropropagation conditions, the dry weights of plantlets from explants with leaves increased more than did those of plantlets from explants without leaves. High PPF, high CO2 concentration, and high ventilation rate increased net photosynthetic rate and promoted growth of the plantlets under photomixotrophic micropropagation conditions. Photomixotrophic conditions produced the greatest dry weight and the longest shoots, but photoautotrophic conditions produced the highest net photosynthetic rate. The number of leaves did not differ significantly between photoautotrophically and photomixotrophically cultured plantlets. Thus, photoautotrophic micropropagation is applicable to the production of high quality tomato transplants.

Diurnal variation in net photosynthetic rate and influencing environmentalfactors of Elaeagnus mollis Diels leaf

2009 ◽  
Vol 17 (3) ◽  
pp. 474-478
Author(s):  
Qun-Long LIU ◽  
Chan-Juan NING ◽  
Duo WANG ◽  
Guo-Liang WU ◽  
Hong-Mei ZHANG ◽  
...  
Keyword(s):  
Diurnal Variation ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Elaeagnus Mollis

scholarly journals Changes in peanut canopy structure and photosynthetic characteristics induced by an arbuscular mycorrhizal fungus in a nutrient-poor environment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yinli Bi ◽  
Huili Zhou
Keyword(s):  
Net Photosynthetic Rate ◽  
Leaf Area ◽  
Photosynthetic Rate ◽  
Mycorrhizal Fungus ◽  
Canopy Structure ◽  
Arbuscular Mycorrhizal ◽  
Photosynthetic Characteristics ◽  
Total Leaf Area ◽  
Tiller Angle ◽  
Amf Inoculation

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.

scholarly journals Foliar spray of gibberellic acid influences morphological attributes and foliage yield of coriander (Coriandrum sativum L.)

2018 ◽  
Vol 5 (1) ◽  
pp. 1-9
Author(s):  
Dhiman Das ◽  
Asim Kumar Bhadra ◽  
Mohd Moniruzzaman
Keyword(s):  
Gibberellic Acid ◽  
Vegetative Growth ◽  
Leaf Length ◽  
Distilled Water ◽  
Water Spray ◽  
Single Plant ◽  
Plant Weight ◽  
Morphological Attributes ◽  
Number Of Leaves ◽  
Different Doses

A field experiment was conducted at the research field of Sher-e- Bangla Agricultural University, Dhaka during the period from December 1, 2016 to January 11, 2017 to investigate the effect of gibberellic acid (GA3) on vegetative growth, morphological attributes and foliage (leaf) yield of coriander (Coriandrum sativum L.). The experimental treatments consisted of eight different doses of GA3 viz., 0 (distilled water spray), 5, 10, 15, 20, 25, 30 and 35 ppm. The variety Rosina (Pahuja Co., India) was used as planting material and different doses of GA3 were applied on the plants at 25 and 30 days after sowing. The experiment was laid out in Randomized Complete Block Design with three replications. GA3 had significant effect on vegetative growth, morphology, foliage yield and yield contributing characters of coriander. Plant height, number of leaves plant-1, leaf length, plant spread and single plant weight were found maximum from the application of GA3 at 20 ppm, which was closely followed by 25 ppm GA3. Application of GA3 at 20 ppm produced the highest weight of foliage m-2. A strong positive correlation of foliage yield was observed with plant height, number of leaves plant-1, leaf length, plant spread, single plant weight and weight of foliage m-2. Application of GA3 at 20 ppm gave maximum foliage yield (9.34 t ha-1) which was followed by GA3 at 15 ppm (8.46 t ha-1) and 25 ppm (8.06 t ha-1), and the minimum foliage yield was recorded from control (distilled water spray) (4.90 t ha-1). Application of GA3 at 20 ppm increased foliage yield over control by 47.54 %. A quadratic relationship between applied GA3 concentration and foliage yield was found; the regression equation was y = 4.87 + 0.375x – 0.009x2 from which it came up to be optimum dose of GA3 as 20.83 ppm.Res. Agric., Livest. Fish.5(1): 1-9, April 2018

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

Plant Science ◽  
2005 ◽  
Vol 169 (3) ◽  
pp. 523-531 ◽  
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

Effects of Clone and Irrigation on the Stomatal Conductance and Photosynthetic Rate of Tea (Camellia sinensis)

1994 ◽  
Vol 30 (1) ◽  
pp. 1-16 ◽  
Author(s):  
B. Gail Smith ◽  
Paul J. Burgess ◽  
M. K. V. Carr
Keyword(s):  
Stomatal Conductance ◽  
Camellia Sinensis ◽  
Photosynthetic Rate ◽  
Leaf Temperature ◽  
Temperature Optimum ◽  
Photosynthetic Rates ◽  
Clone Selection ◽  
Treatment Interaction ◽  
Dry Seasons ◽  
The Relationship

SummaryStomatal conductances (g) and photosynthetic rates (A) were monitored in six tea clones planted in a clone X irrigation experiment in the Southern Highlands of Tanzania. Measurements were made during the warm dry seasons of 1989 and 1990. There was no genotype X treatment interaction in the response in A or g of the various clones to irrigation. Irrigation increased A more than it increased g. Irrigation also increased the temperature optimum for photosynthesis and decreased photo-inhibition at high illuminance. Clones differed in g and A, and in the relationship between leaf temperature and A. The implications of these findings for clone selection are discussed.

scholarly journals Leaf Temperature and Vapour Pressure Deficit (VPD) Driving Stomatal Conductance and Biochemical Processes of Leaf Photosynthetic Rate in a Subtropical Evergreen Coniferous Plantation

2018 ◽  
Vol 10 (11) ◽  
pp. 4063 ◽  
Author(s):  
Yue Li ◽  
Lei Zhou ◽  
Shaoqiang Wang ◽  
Yonggang Chi ◽  
Jinghua Chen
Keyword(s):  
Stomatal Conductance ◽  
Photosynthetic Rate ◽  
Vapour Pressure Deficit ◽  
Leaf Temperature ◽  
Slash Pine ◽  
Seasonal Patterns ◽  
Subtropical China ◽  
Biochemical Processes ◽  
Leaf Photosynthetic Rate ◽  
Positive Effect

Photosynthesis is arguably the most important biochemical process on Earth, which is dramatically influenced by environmental conditions. How environmental factors drive stomatal conductance and biochemical processes of leaf photosynthetic rate has not been sufficiently investigated in subtropical China. In this study, we analysed the effects of stomatal and biochemical parameters on the photosynthetic rate of native Masson’s pine (Pinus massoniana Lamb.) and exotic slash pine (Pinus elliottii Engelm.) in response to leaf temperature and vapour pressure deficit (VPD) in subtropical China, based on leaf gas exchange measurements in 2016. Our results showed that there was no significant difference in the light-saturated photosynthetic rate (Asat) between native Masson’s pine and exotic slash pine. The seasonal patterns of maximum rate of the carboxylation (Vcmax25) were basically consistent with seasonal patterns of Asat for both species. The positive effect of leaf temperature on Asat was mainly produced through its positive effect on Vcmax25. Leaf temperature had no significant effect on stomatal conductance. Vcmax25 and gs simultaneously affected Asat in response to VPD. Our results highlighted the importance of biochemical processes in limiting leaf photosynthetic rate in response to environmental conditions in subtropical evergreen coniferous plantations.

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