BILATERAL LEAF EXPANSION OF TOBACCO UNDER WATER STRESS

1988 ◽  
Vol 68 (3) ◽  
pp. 887-892 ◽  
Author(s):  
MARK J. KING
Keyword(s):  
Growth Rate ◽  
Water Stress ◽  
Nicotiana Tabacum ◽  
Dark Period ◽  
Leaf Growth ◽  
Video Camera ◽  
Light Period ◽  
Leaf Expansion ◽  
Nicotiana Tabacum L ◽  
Growth Distribution

Leaves of control and water-stressed tobacco plants (Nicotiana tabacum L.) were monitored nondestructively, and overall growth and growth distribution within the leaf were compared using a video camera interfaced to a computer. Leaf expansion of control leaves was linear with time. The expansion rate was highest during the dark period and the first 4 h of the light period. The growth rate declined as the light period progressed through 14 h. Leaf expansion of water-stressed plants began declining approximately 44 h after water was withheld. Growth rate during the subsequent dark period increased slightly. Growth resumed within 4–8 h after rewatering. Within 36 h after rewatering, the growth rate was again linear and comparable to controls. During the dark period, the growth distribution was more apical and less basal than during the light period. Lateral growth distribution within the leaf was not affected by developing water stress.Key words: Microcomputer, video camera, Nicotiana tabacum, leaf growth, water stress

Effects of night temperature on the growth of Nicotiana tabacum

1967 ◽  
Vol 7 (24) ◽  
pp. 78 ◽  
Author(s):  
JM Hipkinson
Keyword(s):  
Nicotiana Tabacum ◽  
Leaf Growth ◽  
Dry Weight ◽  
Physiological Adaptation ◽  
Flower Initiation ◽  
Night Temperature ◽  
Temperature Optimum ◽  
Leaf Production ◽  
Node Number ◽  
Nicotiana Tabacum L

Four varieties of flue-cured tobacco, Nicotiana tabacum L., showed similar responses to night temperatures of 10�, 16�, 22�, and 28�C, with a day temperature of 27�C. Leaf growth rates and leaf production rates were approximately the same at night temperatures of 28� and 22�C, and were successively lower at 16� and 10�C. Dry weight accumulation was greatest at 22�. The node number of flower initiation increased with increasing night temperature over the whole range. There was no evidence of either a shift in the night temperature optimum or a physiological adaptation to low temperature during development.

Leaf growth rate and nitrogen content determine respiratory costs during leaf expansion in grapevines

2018 ◽  
Vol 165 (4) ◽  
pp. 746-754 ◽  
Author(s):  
Esther Hernández‐Montes ◽  
Magdalena Tomás ◽  
José M. Escalona ◽  
Josefina Bota ◽  
Hipolito Medrano
Keyword(s):  
Growth Rate ◽  
Nitrogen Content ◽  
Leaf Growth ◽  
Leaf Expansion

scholarly journals Water relations and leaf growth rate of three Agropyron genotypes under water stress

BIOCELL ◽  
2002 ◽  
Vol 26 (3) ◽  
pp. 309-317 ◽  
Author(s):  
MAR虯 G. GARC虯 ◽  
CARLOS A. BUSSO ◽  
PABLO POLCI ◽  
NORBERTO L. GARC虯 GIROU ◽  
VIVIANA ECHENIQUE
Keyword(s):  
Growth Rate ◽  
Water Stress ◽  
Water Relations ◽  
Leaf Growth

scholarly journals The multiscale nature of leaf growth fields

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Shahaf Armon ◽  
Michael Moshe ◽  
Eran Sharon
Keyword(s):  
Growth Rate ◽  
Leaf Growth ◽  
Mechanical Analysis ◽  
Central Control ◽  
Local Growth ◽  
Area Growth ◽  
Equilibrium Process ◽  
Non Gaussian ◽  
Characteristic Scales ◽  
Growth Distribution

AbstractA growing leaf is a prototypical active solid, as its active units, the cells, locally deform during the out-of-equilibrium process of growth. During this local growth, leaves increase their area by orders of magnitude, yet maintain a proper shape, usually flat. How this is achieved in the lack of a central control, is unknown. Here we measure the in-plane growth tensor of Tobacco leaves and study the statistics of growth-rate, isotropy and directionality. We show that growth strongly fluctuates in time and position, and include multiple shrinkage events. We identify the characteristic scales of the fluctuations. We show that the area-growth distribution is broad and non-Gaussian, and use multiscale statistical methods to show how growth homogenizes at larger/longer scales. In contrast, we show that growth isotropy does not homogenize in time. Mechanical analysis shows that with such growth statistics, a leaf can stay flat only if the fluctuations are regulated/correlated.

scholarly journals Endogenous Abscisic Acid Concentrations, Vegetative Growth, and Water Relations of Apple Seedlings following PEG-induced Water Stress

1990 ◽  
Vol 115 (6) ◽  
pp. 991-999 ◽  
Author(s):  
Terence L. Robinson ◽  
Bruce H. Barritt
Keyword(s):  
Growth Rate ◽  
Abscisic Acid ◽  
Water Stress ◽  
Growth Rates ◽  
Shoot Growth ◽  
Leaf Growth ◽  
Turgor Pressure ◽  
Mature Leaves ◽  
Leaf Osmotic Potential ◽  
Shoot Growth Rate

In unstressed apple seedlings (Malus domestics Borkh.), concentrations of free abscisic acid (ABA) decreased in order from apical stem sections, immature expanding leaves, mature stem sections, and mature leaves. PEG-induced water stress stimulated a 2- to 10-fold increase in free ABA concentrations 1 day after treatment, depending on the amount of stress and the tissue. By the 3rd day of stress, free ABA concentrations were nearly the same as the unstressed treatment and remained low for the remainder of the 21-day stress period. Bound ABA concentrations were an order of magnitude lower than free ABA and were not influenced dramatically by water stress. Shoot growth rate, leaf expansion rate, and leaf emergence rate were reduced by water stress in relation to the severity of the stress; this reduction was associated with the initial increase in ABA. However, there was no increase in shoot or leaf growth rates associated with the decline in ABA concentrations by day 3 as growth rates remained depressed on water-stressed plants throughout the 21-day stress period. Water stress reduced evapotranspiration rate and midshoot leaf water potential (ψW)after 1 day, but leaf osmotic potential (ψS) adjusted more slowly, resulting in a loss of leaf turgor. The reduction in leaf turgor pressure (ψP) was highly correlated with decreased shoot growth rate and increased ABA concentrations on day 1 after treatment. By the 3rd day of water stress, ψP bad recovered even in the most severe treatment, and the recovery of turgor was associated with the drop in ABA concentrations. However, the increase in midshoot ψP and the decline in ABA were not associated with any increase in shoot growth rate. The continued inhibition of shoot growth was probably not related to ABA or turgor pressure of mature leaves but may have been related to turgor pressure in the growing tip.

Effects of water stress on the physiological growth indices on performance of soybean genotypes

2015 ◽  
Vol 4 (2) ◽  
pp. 377-382
Author(s):  
Mustapha Yunusa ◽  
Alhassan Ibraheem ◽  
Manu Ibrahim
Keyword(s):  
Growth Rate ◽  
Water Stress ◽  
Leaf Area ◽  
Leaf Growth ◽  
Growth Stages ◽  
Matter Production ◽  
Factorial Trial ◽  
Soybean Genotypes ◽  
Net Assimilation ◽  
The University

Pot experiment was conducted at the Department of Agronomy Crop Pavilion of the University of Ilorin, Ilorinto assess the effects of water stress at different growth stages on the physiological parameters of soybean genotypes. Six soybean genotypes (TGX 536-02D, TGX 1830-2DE, TGX 1019-2EN, TGX 1740-2F, TGX 1485-1D and TGX 1817-12E) were subjected to water stress at three growth stages (vegetative, flowering and post-flowering stages) with a well-watered control. The experiment was designed as a factorial trial and laid out in split- plot arrangements. Morphological growth characters such as number of leaves, leaf area, branching and dry matter production were measured during growth which were used to determine physiological growth indices.Results show that crop growth rate (CGR), relative leaf growth rate (RLGR), net assimilation rate (NAR) and leaf area ratio measured at vegetative growth were significantly reduced by water stress occurring at the vegetative stage.Amongst the investigated genotypes TGX 536-02D was the most tolerant while 1485-1D was the least tolerant genotypes.

A developmental gradient in the mechanism of K+ uptake during light-stimulated leaf growth in Nicotiana tabacum L.

Planta ◽  
2003 ◽  
Vol 217 (4) ◽  
pp. 587-596 ◽  
Author(s):  
Kari A. Stiles ◽  
Anna McClintick ◽  
Elizabeth Van Volkenburgh
Keyword(s):  
Nicotiana Tabacum ◽  
Leaf Growth ◽  
K Uptake ◽  
Nicotiana Tabacum L ◽  
Developmental Gradient

Immunocytochemical studies on the behavior of RuBisCO and LHCP II during the cell cycle of synchronized Euglena gracilis

1990 ◽  
Vol 48 (3) ◽  
pp. 662-663
Author(s):  
Tetsuaki Osafune ◽  
Shuji Sumida ◽  
Tomoko Ehara ◽  
Eiji Hase ◽  
Jerome A. Schiff
Keyword(s):  
Cell Cycle ◽  
Immunoelectron Microscopy ◽  
Growth Phase ◽  
Euglena Gracilis ◽  
Dark Period ◽  
Light Period ◽  
Carboxylase Activity ◽  
Immunocytochemical Studies ◽  
Lhcp Ii

Changes in the morphology of pyrenoid and the distribution of RuBisCO in the chloroplast of Euglena gracilis were followed by immunoelectron microscopy during the cell cycle in a light (14 h)- dark (10 h) synchronized culture under photoautotrophic conditions. The imrnunoreactive proteins wereconcentrated in the pyrenoid, and less densely distributed in the stroma during the light period (growth phase, Fig. 1-2), but the pyrenoid disappeared during the dark period (division phase), and RuBisCO was dispersed throughout the stroma. Toward the end of the division phase, the pyrenoid began to form in the center of the stroma, and RuBisCO is again concentrated in that pyrenoid region. From a comparison of photosynthetic CO2-fixation with the total carboxylase activity of RuBisCO extracted from Euglena cells in the growth phase, it is suggested that the carboxylase in the pyrenoid functions in CO2-fixation in photosynthesis.

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