VARIATIONS IN PHOTOSYNTHESIS, CHLOROPHYLL CONTENT, AND RIBULOSE-l,5-DIPHOSPHATE CARBOXYLASE ACTIVITY WITHIN TOBACCO LEAVES

1974 ◽  
Vol 54 (2) ◽  
pp. 409-412 ◽  
Author(s):  
E. N. ASHWORTH ◽  
L. V. SVEC
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Chlorophyll Concentration ◽  
Single Plant ◽  
Fresh Weight ◽  
Leaf Base ◽  
Carboxylase Activity ◽  
Single Leaf ◽  
Area Basis ◽  
White Burley

Photosynthetic rate on an area basis did not differ when tobacco (Nicotinana tabacum L., ’White Burley’) leaf discs were sampled from margin and base tissue but was greater at the leaf base when expressed per unit chlorophyll or fresh weight. Chlorophyll concentration, ribulose-1,5-diphosphate carboxylase activity, and fresh and dry weights were significantly higher in discs from the margin. If location on the leaf and method of expressing data are not standardized when making comparisons of photosynthesis on a microbasis either within a single leaf, a single plant or among plants, invalid comparisons and conclusions could result.

CONTROL OF CHLOROPHYLL CONTENT BY DAYLENGTH IN LEAVES OF MARQUIS WHEAT

1961 ◽  
Vol 39 (1) ◽  
pp. 51-63 ◽  
Author(s):  
D. J. C. Friend
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll Concentration ◽  
Leaf Thickness ◽  
Floral Initiation ◽  
Fresh Weight ◽  
Fresh Weight Basis ◽  
Chlorophyll Contents ◽  
Mature Leaves ◽  
Unit Leaf ◽  
Stage Of Development

The maximal chlorophyll contents reached during the growth of each of the first three leaves of Marquis wheat increased linearly with daylength, when the plants were grown from germination under illumination of 1750 ft-c intensity for daily periods of 8, 16, or 24 hours. This effect of daylength was also seen when chlorophyll concentration was expressed on a unit leaf area or fresh weight basis, and was related to increased leaf thickness at the longer daylengths. The increased chlorophyll content and concentration under long daylengths could not be duplicated by extending short daylengths with low-intensity supplementary light. Previous experiments suggest that the control of chlorophyll content by daylength is through the control of leaf thickness by the total amount of daily energy.The ratio of chlorophyll a to b in mature leaves did not vary with daylength. There was also no change in the maximal chlorophyll concentration of leaves mature at the time of floral initiation compared with those mature in the vegetative stage of development.

scholarly journals PETUNIA SEEDLING GROWTH - HPS PHOTOPERIOD STUDY

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1103c-1103
Author(s):  
Will Healy ◽  
David Graper
Keyword(s):  
Soil Temperature ◽  
Leaf Area ◽  
Seedling Growth ◽  
Photosynthetic Rate ◽  
Dry Weight ◽  
Fresh Weight ◽  
Total Leaf Area ◽  
Leaf Stage ◽  
Exponential Increase ◽  
Area Basis

Petunia `Red Flash' seedling were grown under HPS (175 μmolm-2 s-1) photoperiod treatments of 10, 12, 14 or 16 hr at 20C soil temperature in a shaded glasshouse where the maximum peak PPF was reduced to 150 μmolm-2s-1. Seedling dry weight and individual leaf area were determined daily. The photosynthetic rate was determined when seedlings reached the second true leaf stage.The dry weight response to increasing photoperiod durations was cubic with a peak at 14 hr. Seedling dry weight increased slowly during days 5 through 10 then increased rapidly during the next 7 to 10 days. This increase coincided with the unfolding of leaves one through four. The total leaf area showed a cubic response to the photoperiod treatments. The leaf area increased slowly then began an exponential increase after day 10. The photosynthetic rate per gram dry weight was increased by the 10 hr photoperiod treatment when compared to the 16 hr treatment. The increased photosynthetic rate was not observed when the data was calculated on a fresh weight or leaf area basis.

scholarly journals The Effect of Pyraclostrobin Application on Yield of Tea (Camelia sinensis (L.) O. Kuntze) under Wet Season

2019 ◽  
Vol 3 (3) ◽  
pp. 153
Author(s):  
Arief Rahman ◽  
Eka Tarwaca Susila Putra ◽  
Sriyanto Waluyo
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Block Design ◽  
Dry Weight ◽  
High Yield ◽  
Fresh Weight ◽  
Wet Season ◽  
Shoot Fresh Weight ◽  
Shoot Dry Weight ◽  
Tea Production

This field experiment aimed to study the effect of pyraclostrobin on tea production and to determine optimum concentration in order to maintain high yield during the period of wet season. The experiment was arranged in Randomized Completely Block Design (RCBD) using single factor and three blocks as replications. The pyraclostrobin doses, consisted of 4 levels, 0, 50, 100, and 150 g.ha-1, each will be tested on three tea clones. Clones tea tested are TRI 2025, Gambung 9 and PGL 15. Data was evaluated for chlorophyll content, photosynthetic rate, number of pecco, number of dormant shoot (banjhi), number of total shoot, pecco fresh weight, banjhi fresh weight, total shoot fresh weight, and shoot dry weight. Data were analysed by using Analysis of Variance (ANOVA) and LSD test at α = 5%. The results informed that pyraclostrobin was able to improve chlorophyll content on TRI 2025 clone, and improved photosynthetic rate on Gambung 9 clone. However,  there was no significant different among plants treated with pyraclostrobin on a yield components, i.e., number of pecco, number of banjhi, pecco fresh weight, banjhi fresh weight, total shoot fresh weight, and total shoot dry weight.

scholarly journals The Preferences of Different Cultivars of Lettuce Seedlings (Lactuca sativa L.) for the Spectral Composition of Light

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1211
Author(s):  
Barbara Frąszczak ◽  
Monika Kula-Maximenko
Keyword(s):  
Chlorophyll Content ◽  
Blue Light ◽  
White Light ◽  
Leaf Shape ◽  
Red Light ◽  
Spectral Composition ◽  
Fresh Weight ◽  
Light Spectrum ◽  
Dark Green ◽  
Relative Chlorophyll Content

The spectrum of light significantly influences the growth of plants cultivated in closed systems. Five lettuce cultivars with different leaf colours were grown under white light (W, 170 μmol m−2 s−1) and under white light with the addition of red (W + R) or blue light (W + B) (230 μmol m−2 s−1). The plants were grown until they reached the seedling phase (30 days). Each cultivar reacted differently to the light spectrum applied. The red-leaved cultivar exhibited the strongest plasticity in response to the spectrum. The blue light stimulated the growth of the leaf surface in all the plants. The red light negatively influenced the length of leaves in the cultivars, but it positively affected their number in red and dark-green lettuce. It also increased the relative chlorophyll content and fresh weight gain in the cultivars containing anthocyanins. When the cultivars were grown under white light, they had longer leaves and higher value of the leaf shape index. The light-green cultivars had a greater fresh weight. Both the addition of blue and red light significantly increased the relative chlorophyll content in the dark-green cultivar. The spectrum enhanced with blue light had positive influence on most of the parameters under analysis in butter lettuce cultivars. These cultivars were also characterised by the highest absorbance of blue light.

scholarly journals Photosynthesis rate, chlorophyll content and initial development of physic nut without micronutrient fertilization

2013 ◽  
Vol 37 (5) ◽  
pp. 1334-1342 ◽  
Author(s):  
Elcio Ferreira dos Santos ◽  
Bruno José Zanchim ◽  
Aline Grella de Campos ◽  
Raphael Florencio Garrone ◽  
José Lavres Junior
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Dry Matter ◽  
Complete Solution ◽  
Physiological Responses ◽  
Dry Matter Production ◽  
Physic Nut ◽  
Initial Development ◽  
Cu Deficiency ◽  
Matter Production

Few studies in Brazil have addressed the need for micronutrients of physic nut focusing on physiological responses, especially in terms of photosynthesis. The objective of this study was to evaluate the effects of omission of boron (B), copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) on Jatropha curcas L.. The experimental design was a randomized block with four replications. The treatments were complete solution (control) and solution without B, Cu, Fe, Mn, and Zn. We evaluated the chlorophyll content (SPAD units), photosynthetic rate, dry matter production and accumulation of micronutrients in plants, resulting from different treatments. The first signs of deficiency were observed for Fe and B, followed by Mn and Zn, while no symptoms were observed for Cu deficiency. The micronutrient omission reduced the dry matter yield, chlorophyll content and photosynthetic rate of the plants differently for each omitted nutrient. It was, however, the omission of Fe that most affected the development of this species in all parameters evaluated. The treatments negatively affected the chlorophyll content, evaluated in SPAD units, and the photosynthetic rate, except for the omission of B. However this result was probably due to the concentration effect, since there was a significant reduction in the dry matter production of B-deficient plants.

scholarly journals Improving the Keeping Quality and Vase Life of Cut Alstroemeria Flowers by Pre and Post-harvest Salicylic Acid Treatments

2013 ◽  
Vol 5 (3) ◽  
pp. 364-370 ◽  
Author(s):  
Elnaz SOLEIMANY-FARD ◽  
Khodayar HEMMATI ◽  
Ahmad KHALIGHI
Keyword(s):  
Salicylic Acid ◽  
Water Balance ◽  
Chlorophyll Content ◽  
Water Loss ◽  
Vase Life ◽  
Total Chlorophyll ◽  
Cut Flowers ◽  
Fresh Weight ◽  
Total Chlorophyll Content ◽  
Keeping Quality

Keeping quality and length of vase life are important factors for evaluation of cut flowers quality, for both domestic and export markets. Studding the effect of pre- and post-harvest salicylic acid applications on keeping quality and vase life of cut alstroemeria flowers during vase period is the approach taken. Aqueous solutions of salicylic acid at 0.0 (with distilled water), 1, 2 and 3 mM were sprayed to run-off (approximately 500 mL per plant), about two weeks before flowers harvest. The cut flowers were harvested in the early morning and both of cut flowers treated (sprayed) and untreated were kept in vase solutions containing salicylic acid at 0.0 (with distilled water), 1, 2 and 3 mM. Sucrose at 4% was added to all treatments as a base solution. The changes in relative fresh weight, water uptake, water loss, water balance, total chlorophyll content and vase life were estimated during vase period. The results showed that the relative fresh weight, water uptake, water balance, total chlorophyll content and vase life decreased significantly while the water loss increased significantly during experiment for all treatments. A significant difference between salicylic acid and control treatments in all measured parameters is observed. During vase period, the salicylic acid treatments maintained significantly a more favourable relative fresh weight, water uptake, water balance, total chlorophyll content and supressed significantly water loss, as compared to control treatment. Also, the results showed that the using salicylic acid increased significantly the vase life cut alstroemeria flowers, over control. The highest values of measured parameters were found when plants were treated by pre + post-harvest application of salicylic acid at 3 mM. The result revealed that the quality attributes and vase life of cut alstroemeria flowers were improved by the use of salicylic acid treatment.

scholarly journals The Influence of Iron Chelates on Chlorophyll Content and Yield of Bajra Napier

2021 ◽  
pp. 1-6
Author(s):  
S. S. Sangeetha ◽  
D. Jawahar ◽  
T. Chitdeshwari ◽  
C. Babu ◽  
L. Lakshmanan
Keyword(s):  
Chlorophyll Content ◽  
Iron Uptake ◽  
Ferrous Sulphate ◽  
Chlorophyll Concentration ◽  
Forage Crop ◽  
Fodder Yield ◽  
Four Levels ◽  
The Impact ◽  
Different Soils

Bajra Napier is an important forage crop. Numerous studies have reported a direct relationship between ferrite levels and physiological function of plants. The present study investigates the impact of iron sources and its levels on yield and chlorophyll content of Bajra Napier. The experiment was carried out in a Factorial CRD with 3 factors namely seven sources of Iron (Fe glycinate, Fe citrate, Fe tartrate, Fe glutamate, FeSO4, Fe-EDDHA, Fe malate) four levels (FeSO4 - 0, 25, 37.5 and 50 kg ha -1 and Fe chelates - 0, 1, 2.5 and 5 kg ha -1) and two different soils (Calcareous and Non-calcareous).The results revealed that the iron application increased the chlorophyll concentration and yield, and it was also seen that as the level increased there was an increase in both the characteristics. These results indicated that applying Fe chelates have significantly improved the quality of produce and it was seen that there was an improvement in the iron uptake and the fodder yield showed a greater increase when compared to ferrous sulphate.

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.

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