scholarly journals An overview of adaptative responses to drought stress in Eucalyptus spp.

2017 ◽  
Vol 67 (1) ◽  
pp. 86-96 ◽  
Author(s):  
Ezzeddine Saadaoui ◽  
Kaouther Ben Yahia ◽  
Samir Dhahri ◽  
Mohamed Lahbib Ben Jamaa ◽  
Mohamed Larbi Khouja
Keyword(s):  
Arid Regions ◽  
Growth Yield ◽  
Great Opportunity ◽  
Choice Of Species ◽  
Species Hybrids ◽  
Physiological And Biochemical ◽  
High Adaptation ◽  
Semi Arid ◽  
Adaptation To Drought ◽  
Selection Of

Abstract Eucalyptus is a plant frequently present and cultivated in arid regions because of its high adaptation to drought. Furthermore, it is known by its numerous species which represents a great opportunity to choose several tolerant species with variable uses. Therefore, the choice of species, hybrids or genotypes resistant to aridity becomes a necessity before any plantation in regions and countries characterized by semi-arid, arid and Saharan climates. Our review shows an important effect of drought on anatomical, physiological and biochemical parameters of Eucalyptus spp. Indeed, water stress acts directly on growth, yield and response to pests. However, the response to drought varies significantly among species, genotypes, hybrids and clones. This result represents a field for the selection of eucalypts tolerant and adapted to water deficit or climate change.

scholarly journals Physiological and biochemical responses at leaf and root levels in two Acacia species (A. cyclops and A. salicina) subjected to dehydration

2021 ◽  
Vol 49 (1) ◽  
pp. 11934
Author(s):  
Samira SOUDEN ◽  
Mustapha ENNAJEH ◽  
Habib KHEMIRA
Keyword(s):  
Water Stress ◽  
Arid Regions ◽  
Severe Drought ◽  
Acacia Species ◽  
Biochemical Responses ◽  
Southern Tunisia ◽  
Severe Water Stress ◽  
Leaves And Roots ◽  
Physiological And Biochemical ◽  
Selection Of

To set-up afforestation and reforestation projects in arid regions southern Tunisia, several indigenous and exotic forest species were used among them are Acacia spp. However, the success of these projects remains highly sceptical because of the intensified aridity during the last decade. To overcome this issue, the selection of genotypes resistant to severe drought is crucial as first step. For this reason, the aim of the present study is to compare tolerance capacity to severe drought between two Acacia species (A. cyclops and A. salicina) and evaluate efficacy of their biochemical responses at leaf and root levels. Combined physiological and biochemical approaches were adopted. Two-years-old plants of two Acacia species (A. cyclops and A. salicina), frequently used in forestation projects in arid regions southern Tunisia, were subjected to severe water stress by withholding watering during 60 days. At regular intervals, water relations and net photosynthetic rate (Pn) were measured. In addition, the biochemical response was characterized by quantifying one sugar alcohol (arabitol) and three cyclitols (myo-inositol, pinitol and quercitol) in leaves and roots. Our results revealed that A. cyclops was more tolerant to severe drought than A. salicina. The turgor of its leaf tissues and its Pn were less affected. The superiority of A. cyclops to tolerate severe water stress might be attributed to greater efficiency of its biochemical defense mechanisms compared to A. salicina. Comparison of biochemical profiles between species exhibited some differences depending on the organs and the species. For development and survival under severe drought conditions, A. cyclops accomplished efficient osmoregualation and osmoprotection mechanisms by massive accumulation of specific polyols distinctly in leaves and roots. Indeed, compared to A. salicina, A. cyclops accumulated higher amount of arabitol, myo-inositol and quercitol in roots, but pinitol in leaves. So, contents of these polyols might be used as promising criteria for the selection of drought-tolerant Acacia species. 

Selection of thermotolerant bradyrhizobial strains for nodulation of soybean (Glycine max L.) in semi-arid regions of Iran

2008 ◽  
Vol 25 (4) ◽  
pp. 591-600 ◽  
Author(s):  
H. Asadi Rahmani ◽  
N. Saleh-rastin ◽  
K. Khavazi ◽  
A. Asgharzadeh ◽  
D. Fewer ◽  
...  
Keyword(s):  
Glycine Max ◽  
Arid Regions ◽  
Glycine Max L ◽  
Semi Arid ◽  
Selection Of

scholarly journals Exogenous Application of Thiourea for Improving the Productivity and Nutritional Quality of Bread Wheat (Triticum aestivum L.)

Agronomy ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1432
Author(s):  
Ahmad Sher ◽  
Xiukang Wang ◽  
Abdul Sattar ◽  
Muhammad Ijaz ◽  
Sami Ul-Allah ◽  
...  
Keyword(s):  
Bread Wheat ◽  
Nutritional Quality ◽  
Arid Regions ◽  
Sandy Loam ◽  
Growth Yield ◽  
Triticum Aestivum L ◽  
Growth Stages ◽  
Exogenous Application ◽  
Semi Arid

Because it is a staple food, sustainable production of wheat is crucial for global food security. Arid and semi-arid regions are worst affected by climate change, which has resulted in poor productivity of different crops, including wheat. To this end, this study aimed to investigate the effect of foliage-applied thiourea on the growth, yield, and nutritional-quality-related traits of bread wheat. The treatments consisted of thiourea levels (control, 500, and 1000 mg L−1) factorally combined with two diverse wheat cultivars (Gandam-1 and Galaxy-2013) at different growth stages (tillering, booting, and heading) and was repeated over two years. The analysis of the data shows that thiourea treatments and the cultivars significantly (p ≤ 0.05) affected the growth, nutritional quality traits, and morphological traits, and the interaction of the two factors was also significant. Improvement in productivity and nutritional quality was observed from the application of thiourea in both cultivars. Galaxy-2013 performed best at 1000 mg L−1 thiourea application for both productivity- and nutritional-quality-related traits at the heading stage. In conclusion, exogenous application of thiourea improves the productivity and nutritional quality of wheat on sandy loam soils in semi-arid regions; however, for wider recommendations, more trials may be conducted across various agro-ecological regions.

scholarly journals The Use of Non-Conventional Water Resources as a Means of Adaptation to Drought and Climate Change in Semi-Arid Regions: South-Eastern Spain

Water ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 93 ◽  
Author(s):  
Álvaro-Francisco Morote ◽  
Jorge Olcina ◽  
María Hernández
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Water Supply ◽  
Arid Regions ◽  
Water Supply Systems ◽  
Natural Risk ◽  
South Eastern ◽  
Supply Systems ◽  
Semi Arid ◽  
Adaptation To Drought

Drought is a climatic risk with notable repercussions on water supply systems. The aim of this study is to analyze the principal measures for management and planning implemented during recent decades in south-eastern Spain (Segura River Basin) to respond to drought situations, focusing on the role played by non-conventional water resources (desalination and treated water). The results demonstrate that the study area (despite being one of the driest places of Spain) is less vulnerable to drought than regions with an Atlantic climate and greater availability of water. This has been possible thanks to the integration of non-conventional water resources as a means of adaptation to confront this natural risk, which is estimated to become more intense and frequent in the future owing to climate change.

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