scholarly journals Evaluation of growth characteristics of trees in an atrium using a simulation model of transmitting PPFD and photosynthetic rate on clear days

2001 ◽  
Vol 27 (3) ◽  
pp. 507-518 ◽  
Author(s):  
Akihiro Nakamura ◽  
Yoshiko Kosugi ◽  
Yukihiro Morimoto
Keyword(s):  
Simulation Model ◽  
Photosynthetic Rate ◽  
Growth Characteristics

scholarly journals Effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress

2019 ◽  
Vol 136 ◽  
pp. 07008
Author(s):  
Shiyao Shan ◽  
Huizhong Luo ◽  
Jinpeng Zhu ◽  
Zhiyu Li ◽  
Huanxiu Li
Keyword(s):  
Stomatal Conductance ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Functional Activity ◽  
Theoretical Basis ◽  
Photosynthetic Capacity ◽  
Growth Characteristics ◽  
Cherry Tomato ◽  
Fresh Weight

To study the effects of the reciprocal grafting on the photosynthesis of two genotypes tomato offspring under selenium stress, red ball cherry tomato cherry 5-5-1 and yellow ball cherry tomato yellow RTY-3-2 post-grafting generation (red scion, red rootstock, yellow scion and yellow rootstock) and seedlings (red CK and yellow CK) planted in 10 mg·kg-1 selenium soil, and the pot experiment was carried out to study the effects of the reciprocal grafting on the growth characteristics and the photosynthesis of tomato offspring under selenium stress. The results showed that grafting increased the fresh weight of the organs of the offspring, the ratio of root to shoot, and the functional activity of the roots of the plants, which was conducive to the growth of tomato offspring. Simultaneously, it could effectively improve the photosynthetic capacity of grafted offspring leaves at the seedling stage. The grafted offspring of rootstocks had the best effect on improving the net photosynthetic rate, stomatal conductance and transpiration rate and stomatal conductance of tomato leaves, and decreased intercellular CO2 concentration. Among them, the best effect of yellow rootstock was to provide ideas and theoretical basis for the production of selenium-enriched tomatoes in the selenium-deficient areas in the future.

scholarly journals A Simulation Model of Rosa hybrida Growth Response to Constant Irradiance and Day and Night Temperatures

1994 ◽  
Vol 119 (5) ◽  
pp. 903-914 ◽  
Author(s):  
Douglas A. Hopper ◽  
P. Allen Hammer ◽  
James R. Wilson
Keyword(s):  
Plant Growth ◽  
Simulation Model ◽  
Growth Response ◽  
Growth Characteristics ◽  
Rosa Hybrida ◽  
Stem Length ◽  
Photon Flux ◽  
Growth Responses ◽  
Wide Range ◽  
Plant Growth Characteristics

This paper details the development and verification of ROSESIM, a computer simulation model of the growth of `Royalty' roses (Rosa hybrida L.) based on experimentally observed growth responses from pinch until flowering under 15 combinations of constant photosynthetic photon flux (PPF), day temperature (DT), and night temperature (NT). Selected according to a rotatable central composite design, these treatment combinations represent commercial greenhouse conditions during the winter and spring in the midwestern United States; each selected condition was maintained in an environmental growth chamber having 12-hour photoperiods. ROSESIM incorporates regression models of four flower development characteristics (days from pinch to visible bud, first color, sepal reflex, and flowering) that are full quadratic polynomials in PPF, DT, and NT. ROSESIM also incorporates mathematical models of nine plant growth characteristics (stem length and the following fresh and dry weights: stem, leaf, flower, and total) based on data recorded every 10 days and at flowering. At each design point, a cubic regression in time (days from pinch) estimated the plant growth characteristics on intermediate days; then difference equations were developed to predict the resulting daily growth increments as third-degree polynomial functions of days from pinch, PPF, DT, and NT. ROSESIM was verified by plotting against time each simulated plant growth characteristic and the associated experimental observations for the eight factorial design points defining the region of interest. Moreover, one-way analysis of variance procedures were applied to the differences between ROSESIM predictions and the corresponding observed means for all 15 treatment combinations. At 20 days from pinch, significant differences (P < 0.05) were observed for all nine plant growth characteristics. At 30 and 40 days from pinch, only flower fresh and dry weights yielded significant differences; at flowering, none of the 13 selected responses yielded significant differences. These graphical and statistical comparisons provide good evidence of ROSESIM's ability to predict the growth response of `Royalty' roses over a wide range of constant environmental conditions.

Competitive growth characteristics betweenMicrocystis aeruginosaandCyclotellasp. accompanying changes in river water inflow and their simulation model

2016 ◽  
Vol 64 (3) ◽  
pp. 123-132 ◽  
Author(s):  
Masahiro Mikawa ◽  
Koichi Sugimoto ◽  
Yoshimasa Amano ◽  
Motoi Machida ◽  
Fumio Imazeki
Keyword(s):  
Simulation Model ◽  
River Water ◽  
Growth Characteristics ◽  
Water Inflow ◽  
Competitive Growth

scholarly journals Melatonin and KNO3 Application Improves Growth, Physiological and Biochemical Characteristics of Maize Seedlings under Waterlogging Stress Conditions

Biology ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 99
Author(s):  
Shakeel Ahmad ◽  
Guo-Yun Wang ◽  
Ihsan Muhammad ◽  
Muhammad Zeeshan ◽  
Xun-Bo Zhou
Keyword(s):  
Plant Growth ◽  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Foliar Application ◽  
Growth Characteristics ◽  
Stress Conditions ◽  
Maize Seedlings ◽  
Waterlogging Stress ◽  
Seed Soaking ◽  
Plant Growth Characteristics

Waterlogging is one of the serious abiotic stresses that inhibits crop growth and reduces productivity. Therefore, investigating efficient waterlogging mitigation measures has both theoretical and practical significance. The objectives of the present research were to examine the efficiency of melatonin and KNO3 seed soaking and foliar application on alleviating the waterlogging inhibited growth performance of maize seedlings. In this study, 100 µM melatonin and different levels (0.25, 0.50 and 0.75 g) of potassium nitrate (KNO3) were used in seed soaking and foliar applications. For foliar application, treatments were applied at the 7th leaf stage one week after the imposition of waterlogging stress. The results showed that melatonin with KNO3 significantly improved the plant growth and biochemical parameters of maize seedlings under waterlogging stress conditions. However, the application of melatonin with KNO3 treatments increased plant growth characteristics, chlorophyll content, and the net photosynthetic rate at a variable rate under waterlogging stress. Furthermore, melatonin with KNO3 treatments significantly reduced the accumulation of hydrogen peroxide (H2O2) and malondialdehyde (MDA), and it decreased the activity of pyruvate decarboxylase and alcohol dehydrogenase, while increasing enzymatic activities and soluble protein content of maize seedlings under waterlogging stress conditions. Overall, our results indicated that seed soaking with 100 µM melatonin and 0.50 g KNO3 was the most effective treatment that significantly improved the plant growth characteristics, chlorophyll content, photosynthetic rate, and enzymatic activity of maize seedling under waterlogging conditions.

scholarly journals Effect of Bentonite on the Early Growth Characteristics of Teak Seedlings Planted in Sandy Soil in Northeast Thailand—A Pilot Study

Forests ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 26
Author(s):  
Masazumi Kayama ◽  
Suchat Nimpila ◽  
Sutjaporn Hongthong ◽  
Reiji Yoneda ◽  
Woraphun Himmapan ◽  
...  
Keyword(s):  
Drought Stress ◽  
Photosynthetic Rate ◽  
Sandy Soil ◽  
Tectona Grandis ◽  
Experimental Period ◽  
Dry Mass ◽  
Early Growth ◽  
Growth Characteristics ◽  
Northeast Thailand ◽  
High Concentration

The growth of teak (Tectona grandis L. f.) seedlings in sandy soil in northeast Thailand is suppressed by infertility and drought stress. In a preliminary field pot experiment, we confirmed that bentonite was useful for increasing soil water availability. To monitor early growth characteristics of teak seedlings in sandy soil, we curried out an experiment of teak seedlings using bentonite and fertilizer in the field from July 2014 to November 2015. We then compared the growth, biomass, photosynthetic rate, leaf water potential, and concentration of elements in the plant organs among the four treatments. Bentonite increased both soil pH and Ca during the experimental period, and retained P in fertilizer. The dry mass of teak seedlings was markedly increased by concurrent use of bentonite and fertilizer. However, the use of bentonite alone showed little increase of dry mass of teak seedlings. Moreover, application of bentonite was mitigated drought stress in dry season, and photosynthetic rate showed high value by high concentration of chlorophyll. The concentration of K in root of teak seedlings was increased by application of bentonite, and its value showed positive correlation with the relative growth rate of teak seedlings. We concluded that bentonite was useful for the uptake of K and retention of P in fertilizer, as a result, growth of teak seedlings was accelerated.

1123: Natural History and Growth Characteristics of Oncocytomas Under Active Surveillance

2006 ◽  
Vol 175 (4S) ◽  
pp. 361-361
Author(s):  
Paul L. Crispen ◽  
Rosalia Viterbo ◽  
Richard E. Greenberg ◽  
David Y.T. Chen ◽  
Robert G. Uzzo
Keyword(s):  
Natural History ◽  
Active Surveillance ◽  
Growth Characteristics

Novel simulation model for many-body multipole dispersion interactions

1998 ◽  
Vol 94 (3) ◽  
pp. 417-433 ◽  
Author(s):  
MARTIN VAN DER HOEF ◽  
PAUL MADDEN
Keyword(s):  
Simulation Model ◽  
Dispersion Interactions ◽  
Many Body
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