Effect of Water Stress on Photosynthesis, Respiration, and Transpiration of Four Abies Species

1973 ◽  
Vol 3 (2) ◽  
pp. 293-298 ◽  
Author(s):  
George S. Puritch
Keyword(s):  
Water Stress ◽  
Maximum Rate ◽  
Net Photosynthesis ◽  
Gradual Reduction ◽  
Linear Rate ◽  
Optimum Rate ◽  
Effect Of Water ◽  
Steady Rate ◽  
Rate Of Decline ◽  
The Relationship

The relationship between water stress and rates of net photosynthesis, respiration, and transpiration was determined for four Abies species native to Canada. Net photosynthesis, after an initial optimum rate, declined in three phases as water stress increased, viz. a rapid linear rate of decline, a second more gradual reduction and, finally, a steady rate of zero net photosynthesis. Of the four species, photosynthesis of A. grandis was affected the least by water stress, whereas that of A. balsamea was affected the most. Respiration declined at about the same water stress as photosynthesis, but was only reduced to between 40–75% of the maximum rate, depending on the species. Transpiration declined at similar water stresses to those of photosynthesis and after an initial decline, continued at between 10–30% of the maximum rate at water stresses up to 35 bars.

Geographic variation in extrafloral nectaries in the ant-associated plant genus Adriana (Euphorbiaceae) and its relationship to water availability

2007 ◽  
Vol 55 (5) ◽  
pp. 568 ◽  
Author(s):  
M. A. Whalen ◽  
D. A. Mackay
Keyword(s):  
Water Stress ◽  
Geographic Variation ◽  
Water Availability ◽  
Secretory Activity ◽  
Climatic Variation ◽  
Extrafloral Nectaries ◽  
Climatic Variables ◽  
Extrafloral Nectary ◽  
Effect Of Water ◽  
The Relationship

The relationship between geographic variation in extrafloral nectary size and climatic variation was assessed in three taxa within Adriana (Euphorbiaceae). In each taxon, there was a significant association between gland size and moisture-related climatic variables. A glasshouse experiment was conducted to examine the effect of water stress on nectary longevity, and it was found that the secretory activity of nectaries declined more rapidly on drought-stressed plants than on watered plants.

Developmental and Metabolic Constraints of the Scope for Activity in Young Rainbow Trout (Salmo Gairdneri)

1985 ◽  
Vol 118 (1) ◽  
pp. 133-142 ◽  
Author(s):  
WOLFGANG WIESER
Keyword(s):  
Maximum Rate ◽  
Constant Factor ◽  
Size Class ◽  
Salmo Gairdneri ◽  
Aerobic Scope ◽  
Steady Rate ◽  
Rate Of Oxygen Consumption ◽  
The Difference ◽  
The Relationship ◽  
Limiting Value

1. The relationship between routine or ‘steady’ rate (Vo2s.r.) and maximum rate of metabolism after forced bursts of activity (V·o2max) was studied in the fry and young (weight range 0.08-7 g) of Salmo gairdneri at 4 and 12°C. 2. The relationship between metabolic rate (y) and body weight (x) can be described by the function y = axb. The mass exponent b equals 0.96 and 0.93 for the routine rate, and 1.11 and 1.14 for the maximum rate of metabolism at 4 and 12°C respectively, the two sets of b-values differing significantly from each other. 3. The difference between the routine and the active rate of metabolism is called the relative scope for activity. Expressed as a percentage of the routine rate it increases from 85–166% in the sac fry, to approximately 400% in fish weighing 10g. 4. Within each of four size classes there is a linear relationship between V·o2s.r. and V·o2max, the slope of the relationship always being greater than one and increasing with the weight of the fish from 1.1 in the sac fry to 5.3 in the 3–7g size class. That is, in the larger size class each increase in the steady rate of oxygen consumption by one unit adds 5.3 units to the aerobic scope for activity. 5. It is speculated that routine and active rate of metabolism are related by a constant factor of expansion so that, up to a limiting value, an increase of the former will lead to an increase of the amount of oxygen available to each fish for additional locomotor activity.

Study on Irrigation Model Based on Plant Ultrasonic Acoustic Emissions

2013 ◽  
Vol 330 ◽  
pp. 346-349
Author(s):  
Jian Xin Wang ◽  
Xian Wei Gao ◽  
Mei Li Sui ◽  
Xiu Ying Li
Keyword(s):  
Water Stress ◽  
Data Acquisition ◽  
Acoustic Emissions ◽  
Water Saving ◽  
Water Molecules ◽  
Effect Of Water ◽  
Irrigation Time ◽  
Conduit Wall ◽  
Cavitation Detection ◽  
The Relationship

Produced by cohesion between water molecules or adhesion to the conduit wall, the plant cavitation is accompanied by the vessel walls vibration which is the indicator of the water stress. The ultrasonic acoustic emissions (UAEs) are used to detect the plant cavitation events which are the transmission of vibration. The UAEs could be detected in ultrasonic frequencies between 100K Hz and 1 MHz. The PCI-2 data acquisition (DAQ) equipment and R15 sensors are used to improve the precision of cavitation detection. When the water stress and dehydration gets heavier, the UAEs rate gets higher. Use the tomato practice data with the empirical deduction under the modern greenhouse conditions, the UAEs and Transpiration Index (UAETI) and the UAEs Irrigation Index (UAEII) irrigation model are draw from the relationship between transpiration and UAEs. UAETI can be used to analysis the transpiration, and UAEII can be used to analysis the irrigation time. It is better to use UAEs technique to carry out automatic and precise irrigation for the plant and to improve the effect of Water-saving irrigation.

Recovery After Water Stress of Leaf Gas Exchange in Panicum maximum var. trichoglume

1980 ◽  
Vol 7 (3) ◽  
pp. 299 ◽  
Author(s):  
MM Ludlow ◽  
TT Ng ◽  
CW Ford
Keyword(s):  
Abscisic Acid ◽  
Water Stress ◽  
Water Potential ◽  
Net Photosynthetic Rate ◽  
Net Photosynthesis ◽  
Recovery Phase ◽  
Stomatal Resistance ◽  
Leaf Water ◽  
Rate Of Recovery ◽  
The Relationship

Net photosynthesis of the last fully expanded leaf of P. maximum var. trichoglume was able to recover from leaf water potentials as low as -92 bar. The degree of stress experienced during the single drying cycle did not influence the maximum net photosynthetic rate attained during recovery, but the time taken to reach the maximum increased with the degree of stress experienced. During the first 24 h, the rate of recovery of net photosynthesis was mainly determined by the rate at which the water status improved. Leaves which experienced water potentials less than c. -40 bar had a slower rate of recovery of water potential than less stressed leaves. This was partially offset by higher rates of net photosynthesis. Furthermore, the relationship between leaf water potential and net photosynthesis recorded during the drying cycle was different from those measured during recovery. Thus different relationships must be used in models simulating behaviour during water stress and subsequent recovery. Stomatal resistance exerted greater control than intracellular resistance over net photosynthesis in the recovery phase, irrespective of the water potential before rewatering or whether plants were preconditioned to stress. Although abscisic acid concentration was positively related to leaf water potential and stomatal resistance during the drying cycle, the relationship between abscisic acid concentration and stomatal resistance during recovery was poor or absent. Sucrose and amino-acid nitrogen accumulated during stress and decreased during recovery. However, the level of non- structural carbohydrates or nitrogen compounds in the recovery phase did not appear to influence net photosynthetic rate or its components. In fact, the reverse appeared to occur: the rate of photosynthesis and growth seemed to determine the levels of these compounds.

The Effect of Water Supply on the Growth of lzmir, Palotina and Amarelinho Tobaccos

1981 ◽  
Vol 11 (2) ◽  
Author(s):  
R. Comber
Keyword(s):  
Water Stress ◽  
Water Supply ◽  
Sand Culture ◽  
Effect Of Water

AbstractThe Oriental tobacco variety Izmir has been grown in sand culture in a greenhouse under various degrees of water stress. Plants given 400 cm

The Effect of Water Stress on Wheat Kernel Size, Color and Protein Composition

2007 ◽  
Vol 22 (2) ◽  
pp. 157-171 ◽  
Author(s):  
Iwona Konopka ◽  
Małgorzata Tańska ◽  
Agnieszka Pszczółkowska ◽  
Gabriel Fordoński ◽  
Witold Kozirok ◽  
...  
Keyword(s):  
Water Stress ◽  
Protein Composition ◽  
Kernel Size ◽  
Effect Of Water ◽  
Wheat Kernel

Effect of water stress on Citrus photosynthesis characteristic

2011 ◽  
Vol 36 (6) ◽  
pp. 653-657
Author(s):  
Shen-xi XIE ◽  
Qiang LIU ◽  
Xing-yao XIONG ◽  
Qiu-ming ZHANG ◽  
C J. Lovatt
Keyword(s):  
Water Stress ◽  
Effect Of Water

Effect of Water Stress on the Growth, Nutritional and Biochemical Status of Two Varieties of Pomegranate Seedlings

2016 ◽  
Vol 7 (12) ◽  
pp. 1321-1329 ◽  
Author(s):  
A. Hamdy ◽  
S. Khalifa ◽  
S. Shawer ◽  
A. Mancy
Keyword(s):  
Water Stress ◽  
Effect Of Water ◽  
Biochemical Status
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