Growth and physiological responses to ozone and mild drought stress of tree species with different ecological requirements

Trees ◽  
2010 ◽  
Vol 24 (4) ◽  
pp. 695-704 ◽  
Author(s):  
Martina Pollastrini ◽  
Rosanna Desotgiu ◽  
Chiara Cascio ◽  
Filippo Bussotti ◽  
Paolo Cherubini ◽  
...  
Keyword(s):  
Drought Stress ◽  
Tree Species ◽  
Physiological Responses ◽  
Ecological Requirements ◽  
Mild Drought

scholarly journals Growth and Physiological Responses of Four Rose Rootstocks to Drought Stress

2009 ◽  
Vol 134 (2) ◽  
pp. 202-209 ◽  
Author(s):  
Genhua Niu ◽  
Denise S. Rodriguez
Keyword(s):  
Drought Stress ◽  
Moisture Content ◽  
Leaf Area ◽  
Physiological Responses ◽  
Growth Parameter ◽  
Dry Weight ◽  
Drought Treatment ◽  
Dry Down ◽  
Substrate Moisture ◽  
Mild Drought

Drought-tolerant garden roses (Rosa spp.) are needed in arid and semiarid regions where irrigation water is scarce. The vast majority of garden rose cultivars are budded or grafted onto rootstocks and are seldom grown on their own roots. The objective of this study was to compare the growth and physiological responses of four rose rootstocks to drought stress. Rosa ×hybrida ‘Dr. Huey’, R. ×fortuniana, R. multiflora, and R. odorata grown in 12-L containers were well-irrigated throughout the experiment or were subjected to mild drought stress for five or six cycles, depending on rootstocks, over 10 weeks. Following the mild drought stress cycles, plants that received the mild drought treatment were subjected to a severe dry-down before termination of the experiment. In R. ×fortuniana, drought stress did not affect any growth parameter. Compared with the well-irrigated plants, shoot dry weight of ‘Dr. Huey’, R. multiflora, and R. odorata were reduced by 22%, 33%, and 38%, respectively, by the drought treatment. The final leaf area of R. multiflora and R. odorata was reduced by 42% and 59%, respectively, compared with the control plants. The final leaf area of ‘Dr. Huey’ was not influenced by the drought treatment. Root to shoot ratio in ‘Dr. Huey’ was unaffected, while that of R. multiflora and R. odorata increased as a result of the drought treatment. As substrate moisture content decreased, leaf relative water content (RWC) of all rootstocks decreased linearly, with differences in decreasing slope or intercept of the linear regression lines among rootstocks. Predawn leaf water potential during the dry-down began to decrease rapidly when substrate moisture content decreased to below 20% (25% in R. odorata) in ‘Dr. Huey’, R. ×fortuniana, and R. multiflora. Leaf net photosynthetic rate (Pn), transpiration rate (E) and stomatal conductance (gs) of all rootstocks decreased rapidly during the dry-down as substrate moisture content decreased from 25%. In ‘Dr. Huey’ and R. ×fortuniana, Pn, E, and gs were closely correlated with leaf RWC, while E and gs of R. odorata were not. Correlations between gas exchange rates (Pn, E, and gs) and leaf RWC in R. multiflora were weaker than those in ‘Dr. Huey’ and R. ×fortuniana. At low substrate moisture content (below 15%), Pn, E, and gs in R. odorata were lower than those in other rootstocks. Growth reduction was greatest in R. odorata, regardless of the least water deficit of the substrate, followed by R. multiflora and ‘Dr. Huey’. The results of this study suggest that R. ×fortuniana was the most tolerant and R. odorata was the least tolerant to drought stress.

scholarly journals GROWTH AND PHYSIOLOGICAL RESPONSES OF TREE SPECIES (Hymenaea courbaril L., Peltophorum dubium (Spreng.) Taub. and Myroxylon peruiferum L. F.) EXPOSED TO DIFFERENT COPPER CONCENTRATIONS IN THE SOIL

2018 ◽  
Vol 42 (2) ◽  
Author(s):  
Daniele Maria Marques ◽  
Adriano Bortolotti Silva ◽  
José Ricardo Mantovani ◽  
Dalvana Sousa Pereira ◽  
Thiago Corrêa Souza
Keyword(s):  
Antioxidant Enzymes ◽  
Tree Species ◽  
Copper Content ◽  
Metal Tolerance ◽  
Physiological Responses ◽  
Forest Species ◽  
Hymenaea Courbaril ◽  
Tolerance Strategy ◽  
Photosynthetic Machinery ◽  
Biometric Measurements

ABSTRACT Copper (Cu) is an essential micronutrient for plants. However, when in excess, it becomes phytotoxic. In this context, the objective of this study was to evaluate the growth and physiological responses of tree species exposed to different copper concentrations in the soil. Three experiments were carried out, one for each forest species under study: Myroxylon peruiferum ("Óleo Bálsamo"), Hymenaea courbaril ("Jatobá") and Peltophorum dubium ("Canafístula"), with the same doses of copper (0, 50, 100, 200 and 400 mg kg-1). The experimental design was in randomized blocks (DBC), with five copper concentrations and four replicates. The plants were grown on soil substrate packed in 8-dm3 pots and kept in a greenhouse for 90 days. Biometric measurements, chlorophyll, antioxidant enzymes and copper content in tissues were evaluated. Copper did not influence the vegetative growth of the species studied. The content of chlorophyll "a" was reduced with increasing copper concentrations in the soil. H. courbaril had 56 to 92% copper retained in the roots, and the same behavior was observed for P. dubium (77-91%) and M. peruiferum (19-64%). In the three species studied, there was copper bioaccumulation, mainly in the roots, possibly as a metal tolerance strategy, preserving the most active tissues and the photosynthetic machinery. Cu translocation from roots to shoot was very restricted in all species. This behavior, associated with the increase in the activity of some antioxidant enzymes in plants, may indicate the phytoremediation potential of the studied species.

Drought stress limits the geographic ranges of two tree species via different physiological mechanisms

2015 ◽  
Vol 22 (3) ◽  
pp. 1029-1045 ◽  
Author(s):  
Leander D. L. Anderegg ◽  
Janneke HilleRisLambers
Keyword(s):  
Drought Stress ◽  
Tree Species ◽  
Physiological Mechanisms ◽  
Geographic Ranges

scholarly journals Leaf Responses to Mild Drought Stress in Natural Variants of Arabidopsis

2015 ◽  
Vol 167 (3) ◽  
pp. 800-816 ◽  
Author(s):  
Pieter Clauw ◽  
Frederik Coppens ◽  
Kristof De Beuf ◽  
Stijn Dhondt ◽  
Twiggy Van Daele ◽  
...  
Keyword(s):  
Drought Stress ◽  
Natural Variants ◽  
Mild Drought

Molecular and physiological responses of Iranian Perennial ryegrass as affected by Trinexapac ethyl, Paclobutrazol and Abscisic acid under drought stress

2017 ◽  
Vol 111 ◽  
pp. 129-143 ◽  
Author(s):  
Mohammad Hossein Sheikh Mohammadi ◽  
Nematollah Etemadi ◽  
Mohammad Mehdi Arab ◽  
Mostafa Aalifar ◽  
Mostafa Arab ◽  
...  
Keyword(s):  
Abscisic Acid ◽  
Drought Stress ◽  
Perennial Ryegrass ◽  
Physiological Responses

Monitoring of transcriptional responses in roots of six wheat cultivars during mild drought stress

2013 ◽  
Vol 41 (4) ◽  
pp. 527-538 ◽  
Author(s):  
M. Szécsényi ◽  
M. Cserháti ◽  
Á. Zvara ◽  
D. Dudits ◽  
J. Györgyey
Keyword(s):  
Drought Stress ◽  
Wheat Cultivars ◽  
Transcriptional Responses ◽  
Mild Drought
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