The Control of Chlorophyll Accumulation in Leaves of Marquis Wheat by Temperature and Light Intensity. II. Chlorophyll Contents Relative to Leaf Area and Thickness

1961 ◽  
Vol 14 (1) ◽  
pp. 28-39 ◽  
Author(s):  
D. J. C. Friend
Keyword(s):  
Light Intensity ◽  
Leaf Area ◽  
Chlorophyll Contents ◽  
Chlorophyll Accumulation ◽  
Leaf Area And Thickness

scholarly journals Whole-plant Response of Six Poinsettia Cultivars to Three Fertilizer and Two Irrigation Regimes

1996 ◽  
Vol 121 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Ursula Schuch ◽  
Richard A. Redak ◽  
James Bethke
Keyword(s):  
Leaf Area ◽  
Chlorophyll Content ◽  
Dry Weight ◽  
Shoot Biomass ◽  
Vegetative Development ◽  
Chlorophyll Contents ◽  
Shoot Dry Weight ◽  
Irrigation Regimes ◽  
Whole Plant ◽  
Leaf N

Six cultivars of poinsettia (Euphorbia pulcherrima Wind.), `Angelika White', `Celebrate 2', `Freedom Red', `Lilo Red', `Red Sails', and `Supjibi Red' were grown for 9 weeks during vegetative development under three constant-feed fertilizer treatments, 80,160, or 240 mg N/liter and two irrigation regimes, well-watered (high irrigation) or water deficient (low irrigation). Plants fertilized with 80 or 240 mg N/liter were 10% to 18% shorter, while those fertilized with 160 mg N/liter were 25 % shorter with low versus high irrigation. Leaf area and leaf dry weight increased linearly in response to increasing fertilizer concentrations. Low irrigation reduced leaf area, leaf, stem, and shoot dry weight 3670 to 41%. Cultivars responded similarly to irrigation and fertilizer treatments in all components of shoot biomass production and no interactions between the main effects and cultivars occurred. Stomatal conductance and transpiration decreased with increasing fertilizer rates or sometimes with low irrigation. Highest chlorophyll contents occurred in leaves of `Lilo Red' and `Freedom Red'. Leaves of plants fertilized with 80 mg N/liter were deficient in leaf N and had 40 % to 49 % lower leaf chlorophyll content compared to plants fertilized with 160 or 240 mg N/liter. Irrigation had no effect on leaf N or chlorophyll content. At the end of the experiment leaves of `Supjibi Red' and `Angelika White' contained higher concentrations of soluble proteins than the other four cultivars.

scholarly journals Effect of Foliar Application of Growth Regulators on Vegetative and Physiological Growth Parameters in Ajowan (Trachyspermum ammi L. Sprague)

2020 ◽  
pp. 100-109
Author(s):  
Y. Rajasekhara Reddy ◽  
G. Ramanandam ◽  
P. Subbaramamma ◽  
A. V. D. Dorajeerao
Keyword(s):  
Leaf Area ◽  
Foliar Application ◽  
Growth Parameters ◽  
Block Design ◽  
Foliar Spray ◽  
Dry Weight ◽  
Area Index ◽  
Chlorophyll Contents ◽  
Trachyspermum Ammi ◽  
Number Of Leaves

A field experiment was carried out during rabi season of 2018-2019, at college farm, College of Horticulture, Dr. Y.S.R. Horticultural University, Venkataramannagudem, West Godavari District, Andhra Pradesh. The experiment was laidout in a Randomised Block Design with eleven treatments (viz., T1- NAA @ 50 ppm, T2-NAA @ 100 ppm, T3-GA3 @ 50 ppm,  T4-GA3 @ 100 ppm, T5-Thiourea @ 250 ppm, T6-Thiourea @ 500 ppm, T7-28-Homobrassinolide @ 0.1 ppm, T8-28-Homobrassinolide @ 0.2 ppm, T9-Triacontinol @ 2.5 ppm, T10-Triacontinol @ 5 ppm, T11-(Control) Water spray) and three replications. The treatments were imposed at 30 and 45 DAT in the form of foliar spray. Foliar application of GA3@ 100 ppm (T4) had recorded the maximum plant height (108.20 cm), leaf area (9.53 cm2) and leaf area index (0.74). Foliar application of thiourea @ 250 ppm (T5) had recorded the maximum values with respect to number of primary branches (15.03 plant-1), number of secondary branches (83.40 plant-1), plant spread (1793 cm2 plant-1), fresh weight (376.29 g plant-1), dry weight (103.54 g plant-1) and number of leaves plant-1((298.8). The same treatment (T5) had recorded the highest values with respect to crop growth rate (1.44 gm-2d-1), chlorophyll-a (1.40 mg g-1), chlorophyll-b (0.076 mg g-1) and total chlorophyll contents (1.48 mg g-1) in the leaves.

scholarly journals Hybrid tea-roses under controlled light conditions. I. The effect of the level of irradiance on the growth and development of seedlings.

1978 ◽  
Vol 26 (1) ◽  
pp. 119-127
Author(s):  
D.P. de Vries ◽  
L. Smeets
Keyword(s):  
Light Intensity ◽  
Leaf Area ◽  
Growth And Development ◽  
Day Length ◽  
Light Conditions ◽  
Flower Bud ◽  
Juvenile Period ◽  
Low Light ◽  
Bud Formation ◽  
Flower Bud Abortion

As a basis for breeding cvs adapted to flowering in winter light conditions, the growth of hybrid tea rose seedlings under controlled conditions was studied. Irradiance varied from 4-24 W/m2, day length was 8 h, temperature 21 deg C. Like cvs, the seedlings sometimes aborted the flower bud at low light intensity. With increasing irradiances, the following phenomena were observed: the juvenile period of the seedlings shortened; plants were longer at bud formation, at first flowering and at flower bud abortion; leaf area and the number of petals increased. Leaf number was constant at all irradiances. Flowering seedlings were smaller at bud formation, but taller at actual flowering than blind ones. Blind seedlings had fewer leaves with a smaller area. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Tillage systems and nitrogen timings effect on growth, stay green and grain quality in maize (Zea mays L.)

2019 ◽  
Vol 40 (6Supl2) ◽  
pp. 3007
Author(s):  
Allah Wasaya ◽  
Muhammad Tahir ◽  
Tauqeer Ahmad Yasir ◽  
Muhammad Mansoor Javed ◽  
Muhammad Ali Raza ◽  
...  
Keyword(s):  
Leaf Area ◽  
Grain Quality ◽  
Management Practices ◽  
Quality Parameters ◽  
Nitrogen Application ◽  
Tillage Systems ◽  
Stay Green ◽  
Chlorophyll Contents ◽  
Tillage Practices ◽  
Mouldboard Plough

Nitrogen (N), being mobile in soil is exposed to various losses owing to unwise use of nitrogen fertilizer, and conventional soil and crop management practices which can be minimized by temporal nitrogen application and different tillage practices. This study was conducted to elucidate the effect of different tillage systems and nitrogen timings on growth, stay green and grain quality in maize. Three tillage systems viz. T1: tillage with cultivator, T2: mouldboard plough + 2-cultivations, T3: chisel plough + 2-cultivations; and five nitrogen timings viz. N1: whole at sowing, N2: ½ at sowing+½ at V5 (5-leaf stage), N3: ½ at sowing+½ at tasseling, N4: ½ at V5+½ at tasseling, N5: 1/3 at sowing+1/3 at V5+1/3 at tasseling). Tillage systems and nitrogen application had significant effect on leaf area per plant, specific leaf area and leaf area ratio. Tillage systems had non-significant effect on stay green and grain quality parameters except for oil contents. However, nitrogen timings had significant effect on chlorophyll a, b and total contents as well as grain quality parameters. The higher a, b and total chlorophyll contents were noted with three splits i.e. 1/3 at sowing+1/3 at V5+1/3 at tasseling compared with other treatments. The results suggest to grow maize by preparing the field through chisel plough and applying N in three splits to improve its growth, chlorophyll contents and grain quality.

Effect of Interspecific Interference, Light Intensity, and Soil Moisture on Soybean (Glycine max), Common Cocklebur (Xanthium strumarium), and Sicklepod (Cassia obtusifolia) Water Uptake

Weed Science ◽  
1993 ◽  
Vol 41 (4) ◽  
pp. 534-540 ◽  
Author(s):  
Ronald E. Jones ◽  
Robert H. Walker
Keyword(s):  
Soil Moisture ◽  
Light Intensity ◽  
Leaf Area ◽  
Water Uptake ◽  
Root Weight ◽  
Pressure Potential ◽  
Unit Leaf Area ◽  
Unit Leaf ◽  
Shoot Weight ◽  
The Relationship

Greenhouse and growth chamber experiments with potted plants were conducted to determine the effects of interspecific root and canopy interference, light intensity, and soil moisture on water uptake and biomass of soybean, common cocklebur, and sicklepod. Canopy interference and canopy plus root interference of soybean with common cocklebur increased soybean water uptake per plant and per unit leaf area. Root interference with soybean decreased common cocklebur water uptake per plant. Canopy interference of soybean with sicklepod increased soybean water uptake per unit leaf area, while root interference decreased uptake per plant. Combined root and canopy interference with soybean decreased water uptake per plant for sicklepod. Soybean leaf area and shoot weight were reduced by root interference with both weeds. Common cocklebur and sicklepod leaf area and shoot weight were reduced by root and canopy interference with soybeans. Only common cocklebur root weight decreased when canopies interfered and roots did not. The relationship between light intensity and water uptake per unit leaf area was linear in both years with water uptake proportional to light intensity. In 1991 water uptake response to tight was greater for common cocklebur than for sicklepod. The relationship between soil moisture level and water uptake was logarithmic. Common cocklebur water uptake was two times that of soybean or sicklepod at −2 kPa of pressure potential. In 1991 common cocklebur water uptake decreased at a greater rate than soybean or sicklepod in response to pressure potential changes from −2 to −100 kPa.

Investigations into the increased rust (Puccinia helianthi) intensity on some hybrid sunflower cultivars grown in Queensland

1984 ◽  
Vol 35 (1) ◽  
pp. 99
Author(s):  
KC Goulter ◽  
JK Kochman ◽  
JF Brown
Keyword(s):  
Light Intensity ◽  
Leaf Area ◽  
Liquid Nitrogen ◽  
Low Light ◽  
Puccinia Helianthi ◽  
Low Light Intensity ◽  
Generation Times ◽  
Race 1 ◽  
Hybrid Sunflower

Sunflower rust intensity in crops of several hybrid cultivars in Queensland during the 1980, 1981 and 1982 seasons ranged from 30 to 60% of leaf area. In previous years, these cultivars had rust ratings of 2-5%. Rust was also found on some crops of usually immune hybrids grown during winter in central Queensland. A number of rust differential lines were inoculated with several isolates collected from throughout Queensland during 1981 and 1982, as well as with isolates stored in liquid nitrogen from the years 1976, 1978 and 1980. Because all isolates failed to infect the differentials possessing either the R1 or R2 genes for resistance, all collections were allocated to race 1. Comparisons of the temporal isolates revealed that no differences could be detected among the generation times, pustule number and pustule size produced by isolates on a range of sunflower rust differentials and hybrid cultivars. These data indicated that the composition of the pathogenic population had not altered. The application of higher inoculum densities shortened generation times and produced more pustules; both relationships were linear. The development of race 1 rust on seedlings of the immune hybrid Hysun 30 was induced by maintaining the plants under low light intensity or short photoperiods.

AN ANALYSIS OF DRY MATTER PRODUCTION OF DOUGLAS-FIR SEEDLINGS IN RELATION TO TEMPERATURE AND LIGHT INTENSITY

1967 ◽  
Vol 45 (11) ◽  
pp. 2063-2072 ◽  
Author(s):  
Holger Brix
Keyword(s):  
Light Intensity ◽  
Leaf Area ◽  
Dry Matter ◽  
Douglas Fir ◽  
Dry Matter Production ◽  
Dry Matter Distribution ◽  
Pronounced Increase ◽  
Light Intensities ◽  
Matter Production ◽  
Net Assimilation

Seedlings of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) were grown in growth chambers under all combinations of three temperatures (13, 18, and 24 °C) and three light intensities (450, 1000, and 1800 ft-c). Dry matter production of leaves, stem, and roots was determined at 65 and 100 days after germination. The leaf area produced per unit of leaf dry weight and the dry matter distribution to the plant organs was measured. Net assimilation rates between the ages of 65 and 100 days were calculated. Rates of photosynthesis per unit of leaf were determined at different light intensities and temperatures, and rates of respiration of plant top and of roots were found for different temperatures.Increasing light intensity affected dry matter production in two opposing ways: (i) it increased the rate of photosynthesis per unit leaf area, and (ii) it decreased the leaf area added per unit of dry matter produced. A pronounced increase in growth with increase in temperature from 13 to 18 °C was a result of a temperature influence on production of leaf area rather than the effect of photosynthesis per unit of leaf. Net assimilation rates decreased with increase in temperature at all light intensities.

scholarly journals Parâmetros biométricos e fisiológicos de Heliconia bihai cultivada em região litorânea sob diferentes níveis de radiação solar

2016 ◽  
Vol 22 (1) ◽  
pp. 50
Author(s):  
Reivany Eduardo Morais Lima ◽  
Fábio Costa Farias ◽  
Marlos Alves Bezerra ◽  
Fred Carvalho Bezerra
Keyword(s):  
Stomatal Conductance ◽  
Light Intensity ◽  
Leaf Area ◽  
Vegetative Growth ◽  
Reproductive Development ◽  
Significant Difference ◽  
Number Of Leaves ◽  
Sunlight Intensity ◽  
Different Levels ◽  
Carbohydrate Contents

The aim of this work was evaluate the effect of different levels of light intensity on the physiology, vegetative and reproductive development of Heliconia bihai cv. Lobster Claw Two grown under coastal zone of Ceara State. Plants of this species were grown under full and 30%, 40% and 50% reduction sunlight intensity. It was evaluated the number of leaves and tillers per plant; amount of stalks; leaf area, water and carbohydrate content in the leaf next to the inflorescence arising and next to the inflorescence at harvest stage. Photosynthesis, transpiration and stomatal conductance of plants were measured for six consecutive months. Significant difference were attained for leaf area and water content in leaves close to the inflorescence at harvest stage, with lower values, and carbohydrate contents in leaves, with higher values in plants grown in full sun. The treatments with lower levels of solar radiation had higher amounts of stalks and higher vegetative growth, the reduction in vegetative growth of the plants under full sun was due to the lower photosynthetic rate and lower translocation of assimilates.

scholarly journals EFFECT OF IRRIGATION LEVELS AND SPRAYING MEPIQUAT CHLORIDE ON GROWTH AND PRODUCTIVITY OF PEACH TREES

2019 ◽  
pp. 9-19
Keyword(s):  
Leaf Area ◽  
Foliar Application ◽  
Fruit Weight ◽  
Leaf Length ◽  
Shoot Length ◽  
Mepiquat Chloride ◽  
Chlorophyll Contents ◽  
Number Of Leaves ◽  
Peach Trees ◽  
Irrigation Levels

To study the effect of rationalizing irrigation and mepiquat chloride foliar application on growth, productivity and fruit quality of Florida Brines peach trees grafted on Nimagard root stock and grown in sandy soil at a private orchard in El- Tahadi road, EL-Behara Governorate, Egypt. A trial in a split plot design has carried out through two successive seasons of 2018 and 2019. Three drip irrigation levels (100, 80 and 60 % of ETc) were in the main plot and mepiquat chloride foliar application by three levels (without, 150 and 300 ppm) in sub plot and all trees had fertilized by recommended doses. Results indicated that shoot length (cm) and number of leaves/ shoot was not significantly affect by the three irrigation levels in both seasons. Reducing irrigation increased acidity of peach fruits and led to a significant reduction on leaf area (cm)2, total chlorophyll contents, yield, fruit weight, flesh weight, seed weight, TSS and total sugars but no significant difference between irrigation by 80 or 60 % from calculated ETc except with yield and seed weight in both studied seasons. Number of leaves/ shoot, yield either kg/tree or ton/feddan and fruit flesh thickness (cm) were not significantly affected by mepiquat chloride foliar application at all concentrations in both seasons. The highest fruit TSS and the lowest shoot length (cm), leaf length and width (cm), leaf area (cm2) and total fruit acidity were obtained from peach trees treated by mepiquat chloride foliar application at 300 ppm but by mepiquat chloride foliar application at150ppm achieved the highest increase in fruit weight (gr), flesh weight (gr) and fruit total sugars in both seasons. Additionally, the obtained data from the interaction between irrigation levels and mepiquat chloride foliar application showed that mepiquat chloride foliar application made the decrease in irrigation level gave no significantly reduction in shoot length, leaf length and width (cm), leaf area (cm2) especially with concentration 150 ppm and with 300 ppm on leaf total chlorophyll contents. However, this interaction failed to show a clear trend on others studied parameters in both seasons. In addition, peach leaf anatomy has affected by foliar application with mepiquat chloride at 150 ppm and 300 ppm where a prominent increase in thickness of lamina of leaf blade more than those of unsprayed ones (control) has found. Finally, irrigated peach trees by 60% of calculated ETc led to the highest water saving and gave the highest productivity of irrigation water where every used m3 water gave (4.83 & 5.33 kg peach fruits).

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