scholarly journals Assessment of drought tolerance of some Triticum L. species through physiological indices

2012 ◽  
Vol 48 (No. 4) ◽  
pp. 178-184 ◽  
Author(s):  
M.A.R.F. Sultan ◽  
L. Hui ◽  
L.J. Yang ◽  
Z.H. Xian
Keyword(s):  
Water Stress ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Wheat Breeding ◽  
Wheat Species ◽  
Wheat Seedlings ◽  
Wild Wheat ◽  
Water Stress Tolerance ◽  
The World ◽  
Mda Content

Wheat is one of the most important crops in the world. Its yield is greatly influenced by global climate change and scarcity of water in the arid and semi-arid areas of the world. So, exploration of gene resources is of importance to wheat breeding in order to improve the crop ability of coping with abiotic stress environment. Wild relatives of wheat are rich repositories of beneficial genes that confer tolerance or resistance not only to drought but also to other environmental stresses. In the present study, the changes in leaf relative water content (RWC), free proline content, and malondialdehyde (MDA) accumulation of five wild wheat species including T. boeticum (YS-1L), T. dicoccum var. dicoccoides (YS-2L), T. araraticum (ALLT), and two cultivated varieties of T. turgidum ssp. durum (MXLK and 87341), with two well-known common wheat cultivars (SH6 and ZY1) possessing strong drought resistance and sensitiveness, respectively, as references were investigated during 3-day water stress and 2-day recovery, in order to assess the drought tolerance of these wild wheat species. The laboratory experiment was conducted under two water regimes (stress and non-stress treatments). Stress was induced to hydroponically grown two weeks old wheat seedlings with 20% PEG 6000. Stress treatment caused a much smaller decrease in the leaf RWC and rise in MDA content in YS-1L compared to the other wheat species. From the data it was obvious that YS-1L was the most drought tolerant among studied species having significantly higher proline and RWC while lower MDA content under water stress conditions. The order of water stress tolerance of these species according to the three parameters is: YS-1L > YS-2L > SH6 > 87341 > ZY1 > MXLK > ALLT. We speculate that the observed drought stress tolerance at a cellular level was associated with the ability to accumulate proline and high water level conservation.

scholarly journals Improvement of drought tolerance in rice using line X tester mating design and biochemical molecular markers

2022 ◽  
Vol 46 (1) ◽  
Author(s):  
Almoataz Bellah Ali El-Mouhamady ◽  
Abdul Aziz M. Gad ◽  
Ghada S. A. Abdel Karim
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Water Deficit ◽  
Scientific Progress ◽  
Crop Productivity ◽  
Hybrid Generation ◽  
Water Stress Tolerance ◽  
Rice Genotypes

Abstract Background Water stress, specifically the limited water resources needed to grow strategic crops, especially rice, poses a great threat to crop productivity. So, it was imperative that scientists all work together to try genetically improving the rice for drought tolerance in light of these environmental challenges. The aim of this study is trying to know the genetic behavior responsible for water-deficit tolerance in rice genotypes but at the molecular level. Moreover, this attempt will be an important leap in the process of genetic improvement in rice for water stress tolerance in Egypt. Results Twenty-three rice genotypes including eight parents and their fifteen F1 crosses or (the first hybrid generation) by line X tester analysis were evaluated for water stress tolerance during two experiments (the control and drought experiment) besides some molecular–biochemical studies for eight parents and the highest selected five crosses for water stress tolerance. The research revealed that five rice crosses out of fifteen hybrids were highly tolerant to water stress compared to the normal conditions. Data of biochemical markers indicated the presence of bands that are considered as molecular genetic markers for water-deficit tolerance in some rice genotypes, and this is the scientific progress achieved in this research. This was evident by increasing the density and concentration of SDS-protein electrophoresis besides enhancing the activities of peroxidase (POD) and polyphenol oxidase (PPO) under water-deficit conditions, which confirmed the tolerance of drought stress in the eight rice genotypes and the best five crosses from the first hybrid generation. Conclusion The five promising and superior rice hybrids showed an unparalleled tolerance to water stress in all evaluated traits under water stress treatment compared to the standard experiment. Also, biochemical and molecular parameters evidence confirmed the existence of unquestionable evidence that it represents the main nucleus for producing rice lines tolerated for drought stress under Egyptian conditions.

Antioxidant system response of different wheat cultivars under drought: field and in vitro studies

2001 ◽  
Vol 28 (11) ◽  
pp. 1095 ◽  
Author(s):  
Hernán R. Lascano ◽  
Gerardo E. Antonicelli ◽  
Celina M. Luna ◽  
Mariana N. Melchiorre ◽  
Leonardo D. Gómez ◽  
...  
Keyword(s):  
Water Stress ◽  
Drought Tolerance ◽  
Oxidative Damage ◽  
Stress Tolerance ◽  
Antioxidant System ◽  
System Response ◽  
Wheat Cultivars ◽  
System Activity ◽  
Water Stress Tolerance

The participation of the antioxidant system in the drought tolerance of wheat cultivars (Triticum aestivum L.) was studied under field and in vitro conditions. Under field conditions, drought tolerance was evaluated by the capacity to maintain the grain yield under drought, which was higher in cvv. Elite and La Paz than in the sensitive cvv. Oasis and Cruz Alta. Tolerant cultivars showed lower relative water content (RWC) and lower above-ground vegetative biomass than sensitive cultivars. Field assays did not show a clear correlation between water-stress tolerance and antioxidant system behaviour. However, when leaves of cvv. with contrasting drought tolerance were subjected to osmotic stress in vitro, clear differences in the antioxidant system activity and oxidative damage between cvv. were observed. In the tolerant cultivar Elite, it was possible to observe an increase in ascorbate peroxidase (APX), superoxide dismutase (SOD) and glutathione reductase (GR) activities, a higher glutathione (GSH) and ascorbate content and less oxidative damage than in the sensitive cultivar Oasis, which showed no changes or only slight decreases in the enzyme activities. These results indicate that water stress tolerance is in part associated with the antioxidant system activity, and suggest that the behaviour of the antioxidant systemin vitro assays can be used as an early selection tool.

scholarly journals Physiological Basis of Water Stress Tolerance in Soybean

2016 ◽  
Vol 18 (2) ◽  
pp. 71-78 ◽  
Author(s):  
KK Sarkar ◽  
MA Mannan ◽  
MM Haque ◽  
JU Ahmed
Keyword(s):  
Water Stress ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Field Capacity ◽  
Yield Reduction ◽  
Genotypic Variability ◽  
Physiological Basis ◽  
Water Stress Tolerance ◽  
Malondialdehyde Content ◽  
Soybean Genotypes

An experiment was conducted to study the effects of water stress on physiological parameters associated to drought tolerance in soybean at the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during January to April, 2015. Four soybean genotypes namely i) BU Soybean 1 ii) Binasoybean 1 iii) Galarsum and iv) BARI Soybean 5 were grown in two watering regimes viz. control (80% of the field capacity) and water stress (50% of the field capacity). Genotypic variability was found in water stress tolerance in soybean. Highest accumulation of leaf proline, sugar and water content and lower accumulation of malondialdehyde were found in Binasoybean 1 compared to other genotypes. Lowest yield reduction was found in Binasoybean 1. Binasoybean 1 showed relatively higher drought tolerance whereas BARI Soybean 5 was found susceptible to yield. It was found that higher water stress tolerance in Binasoybean 1 was associated with better water relations and higher accumulation of sugar and proline and lower accumulation of malondialdehyde content in leaf.Bangladesh Agron. J. 2015, 18(2): 71-78

scholarly journals Glycine Betaine-Mediated Root Priming Improves Water Stress Tolerance in Wheat (Triticum aestivum L.)

Agriculture ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1127
Author(s):  
Nazir Ahmed ◽  
Mingyuan Zhu ◽  
Qiuxia Li ◽  
Xilei Wang ◽  
Jiachi Wan ◽  
...  
Keyword(s):  
Triticum Aestivum ◽  
Water Stress ◽  
Stress Tolerance ◽  
Root Architecture ◽  
Dry Matter ◽  
Triticum Aestivum L ◽  
Dry Matter Accumulation ◽  
Wheat Roots ◽  
Wheat Seedlings ◽  
Water Stress Tolerance

Droughts represent one of the main challenges that climate change imposes on crop production. As a globally cultivated staple crop, wheat (Triticum aestivum L.) is prone to drought environments. Therefore, improvement in drought tolerance represents a growing concern to ensure food security, especially for wheat. In this perspective, the application of Phyto-phillic exogenous materials such as glycine-betaine (GB) has been attracting attention, particularly in stress-related studies. Since roots procure the water and nutrients for plants, any improvements in their response and capacity against drought stress could induce stress tolerance in plants. However, the knowledge about the changes in root architecture, defense mechanism, hormonal metabolism, and downstream signaling, in response to GB-mediated root priming, is still limited. Therefore, we designed the present study to investigate the role of GB-mediated root priming in improving the water stress tolerance in wheat (cv. Jimai-22) under in-vitro conditions. The roots of twelve days old wheat seedlings were treated with Hoagland’s solution (GB-0), 50 mM GB (GB-1), and 100 mM GB (GB-2) for 48 h and subjected to well-watered (WW) and water-stress (WS) conditions. The osmotic stress substantially impaired shoot/root growth, dry matter accumulation, and increased malondialdehyde (MDA) and hydrogen-peroxide (H2O2) production in the roots of wheat seedlings. However, GB-mediated root priming improved the redox homeostasis of wheat roots by boosting the activities of SOD and POD and triggering the significantly higher accumulation of abscisic acid (ABA) and salicylic acid (SA) in the roots of GB-primed plants. Consequently, it modified the root architecture system and improved plant growth, dry matter accumulation, and water-stress tolerance of wheat seedlings. Moreover, GB-mediated root priming increased root sensitivity to water stress and induced overexpression of stress-responsive genes involved in ABA metabolism (TaNECD1, TaABA’OH2), their downstream signal transduction (TaPP2C, TaSNRK2.8), and activation of different transcriptional factors (TabZIP60, TaAREB3, TaWRKY2, TaERF3, and TaMYB3) that are associated with plant metabolite accumulation and detoxification of ROS under water stress conditions. Overall, our results demonstrated that GB-priming improved the physiological and biochemical attributes of wheat plants under WS conditions by improving the drought perception capacity of wheat roots, ultimately enhancing the water stress tolerance. Thus, the GB-priming of roots could help to enhance the water-stress tolerance of economically important crops (i.e., wheat).

Rhizosphere Symbionts Improve Water Stress Tolerance in Moldavian balm through Modulation of Osmolytes

Rhizosphere ◽  
2021 ◽  
pp. 100367
Author(s):  
Zohreh Ghanbarzadeh ◽  
Hajar Zamani ◽  
Sasan Mohsenzadeh ◽  
Łukasz Marczak ◽  
Maciej Stobiecki ◽  
...  
Keyword(s):  
Water Stress ◽  
Stress Tolerance ◽  
Water Stress Tolerance

Screening for water stress tolerance in eleven plum (Prunussalicina L.) Cultivars using agronomic and physiological traits

2021 ◽  
Vol 281 ◽  
pp. 109992
Author(s):  
Anas Hamdani ◽  
Jamal Charafi ◽  
Said Bouda ◽  
Lahcen Hssaini ◽  
Atman Adiba ◽  
...  
Keyword(s):  
Water Stress ◽  
Stress Tolerance ◽  
Physiological Traits ◽  
Water Stress Tolerance

LIFE HISTORY TYPE AND WATER STRESS TOLERANCE IN NINE CALIFORNIA CHAPARRAL SPECIES (RHAMNACEAE)

2007 ◽  
Vol 77 (2) ◽  
pp. 239-253 ◽  
Author(s):  
R. B. Pratt ◽  
A. L. Jacobsen ◽  
K. A. Golgotiu ◽  
J. S. Sperry ◽  
F. W. Ewers ◽  
...  
Keyword(s):  
Life History ◽  
Water Stress ◽  
Stress Tolerance ◽  
Water Stress Tolerance

scholarly journals Estimation of water stress tolerance of six woody plant species

2021 ◽  
Vol 5 (2) ◽  
pp. 64-72
Author(s):  
Danesha Seth Carley ◽  
Lauren A Gragg ◽  
Matthew J Matthew ◽  
Thomas W Rufty
Keyword(s):  
Water Stress ◽  
Stress Tolerance ◽  
Plant Species ◽  
Woody Plant ◽  
Woody Plant Species ◽  
Water Stress Tolerance
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