scholarly journals Photosynthetic Activity of Fodder Grasses Under Conditions of Drought Stress

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Mariola Staniak
Keyword(s):  
Drought Stress ◽  
Photosynthetic Activity ◽  
Fodder Grasses

The Role of Abscisic Acid in the Response of Two Different Wheat Varieties to Water Deficit

2009 ◽  
Vol 64 (1-2) ◽  
pp. 77-84 ◽  
Author(s):  
Hala Ezzat Mohamed ◽  
Ghada Saber M. Ismail
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Transpiration Rate ◽  
Electrolyte Leakage ◽  
Photosynthetic Activity ◽  
Recovery Period ◽  
Wheat Varieties ◽  
Relative Water ◽  
Negative Effect

The changes in plant growth, transpiration rate, photosynthetic activity, plant pigments, electrolyte leakage, H2O2 content, lipid peroxidation, catalase activity and endogenous content of abscisic acid (ABA) were followed in the leaves of two wheat varieties (sakha 93 and 94) during drought stress and subsequent rehydration. Drought stress caused several inhibitory changes in the growth of both wheat varieties, particularly in sakha 94. Exogenous ABA treatment improved the growth of sakha 93 plants as indicated by a higher relative water content, transpiration rate and lower electrolyte leakage and also enhanced the growth during the recovery period. Such improvement may be the result of the induction of enzymatic (catalase) and non-enzymatic (carotenoid) systems. ABA treatment did not ameliorate the negative effect of drought on the growth of sakha 94.

scholarly journals INTERFERENCE OF BLACK AND EASTERN BLACK NIGHTSHADE WITH TRANSPLANTED TOMATOES.

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1132b-1132
Author(s):  
Milton E. McGiffen ◽  
John B. Masiunas ◽  
Morris G. Huck
Keyword(s):  
Drought Stress ◽  
Photosynthetic Activity ◽  
Yield Loss ◽  
Stomatal Resistance ◽  
Solanum Nigrum ◽  
Soil Water Depletion ◽  
Eastern Black Nightshade ◽  
Solanum Ptycanthum ◽  
Black Nightshade ◽  
Tomato Yield

Eastern black nightshade (Solanum ptycanthum) and black (Solanum nigrum) nightshade are difficult to control in tomato, interfering with harvest and decreasing fruit quality and yield. In irrigated tomatoes, soil water depletion was greater as nightshade density increased. However, tomato yield loss due to black nightshade was greatest at the lower weed densities. As density increases, photosynthetic activity (photosynthetic rates, stomatal conductance, intercellular CO2 concentration, and stomatal resistance) of black nightshade is more affected than eastern black nightshade. Photosynthetic activity of tomato is the least affected. In greenhouse experiments where water was denied for approximately a week prior to measurement, tomatoes were more sensitive to water stress than were nightshades. Nightshades were more adapted to drought stress than were tomatoes.

scholarly journals Drought increases chlorophyll content in stems of Vitis interspecific hybrids

2021 ◽  
Vol 33 (1) ◽  
pp. 69-78
Author(s):  
Laura Rustioni ◽  
Davide Bianchi
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Photosynthetic Activity ◽  
Adaptation Strategy ◽  
Woody Tissue ◽  
Physiological Mechanisms ◽  
Adaptation Mechanism ◽  
Drought Tolerant ◽  
Response To Water ◽  
Parameter Approach

AbstractPlants respond to drought stress through different physiological mechanisms. To highlight a specific adaptation strategy related to stem photosynthetic activity, woody tissue pigmentation was studied. In this work, 25 Vitis hybrids were studied in two experimental vineyards: one of them with sufficient water availability and the other showing drought stress. 1500 reflectance spectra of woody tissues were collected. Beside the spectral elaboration and interpretation, indexes for the pigment quantification were calculated. The content and the proportion in chlorophylls (a and b) in stems were significantly modified in response to water stress. Genotypes were classified based on their plasticity/elasticity and adaptive/susceptible behavior. The cluster analysis produced 4 main groups based on their average spectra and on the spectral variations between watered and stress conditions. The most interesting genotypes concerning this trait were pointed out. Nevertheless, this adaptation mechanism could also be due to an increased detoxification necessity related to other physiological disfunctions caused by water stress. A multi-parameter approach is encouraged for phenotyping of abiotic stress tolerant plant selection. In the next future, this work will support the release of new drought tolerant rootstocks for viticulture.

scholarly journals Assessment of the Response of Photosynthetic Activity of Mediterranean Evergreen Oaks to Enhanced Drought Stress and Recovery by Using PRI and R690/R630

Forests ◽  
2017 ◽  
Vol 8 (10) ◽  
pp. 386 ◽  
Author(s):  
Chao Zhang ◽  
Catherine Preece ◽  
Iolanda Filella ◽  
Gerard Farré-Armengol ◽  
Josep Peñuelas
Keyword(s):  
Drought Stress ◽  
Photosynthetic Activity ◽  
Evergreen Oaks
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