scholarly journals ANATOMICAL STUDIES OF DROUGHT TOLERANCE RELATED TRAITS OF 26 WHEAT VARIETIS IN IRAN

AGROFOR ◽  
2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Maryam Abbasi ◽  
Elham Faghani ◽  
Habibollah Soghi ◽  
Ali Hossein Khani
Keyword(s):  
Triticum Aestivum L ◽  
Stress Factors ◽  
Growth And Yield ◽  
Vascular Bundles ◽  
Wheat Varieties ◽  
Temperature Changes ◽  
Wheat Production ◽  
Abiotic Stress Factors ◽  
Recent Climate ◽  
Golestan Province

Wheat (Triticum aestivum L.) is known as a drought semi-tolerant species.Reduction in wheat growth and yield are the most common responses to drought orsalt stress mainly caused by an inhibition of leaf expansion and stem elongation.One of the important abiotic stress factors limiting wheat production in semiaridregions is drought. Recent climate changes such as temperature changes anddecreasing rainfall in different regions of Iran have had significant impact on agroecosystemsand have caused drought stress to become a severe limiting factorin wheat production. This research was conducted for evaluation of leaf anatomicaland cytological traits of 26 wheat varieties in Golestan province (Iran) over 40years in order to identify the most effective traits in determining maximum yieldpotential. The width and length of vascular bundles, diameter of meta xylem,distance between vascular bundles to upper and lower epidermis, fiber bundlesdiameter and width of midrib and lamina were measured. Finally, based on theanatomic results, wheat varieties with the highest adaptation ability to droughtstress were identified and introduced.

scholarly journals Genetic modifications as a future prospect in the improvement of the major qualitative traits of cereals. A review

2016 ◽  
Vol 71 (3) ◽  
pp. 37-50
Author(s):  
KAROLINA DUDZIAK ◽  
MICHAŁ NOWAK ◽  
KRZYSZTOF KOWALCZYK
Keyword(s):  
Agricultural Development ◽  
Oryza Sativa L ◽  
Molecular Genetic ◽  
Triticum Aestivum L ◽  
Stress Factors ◽  
Direct Gene Transfer ◽  
Biotic And Abiotic Stress ◽  
Hordeum Vulgare L ◽  
Economic Significance ◽  
Abiotic Stress Factors

Progress in cereals transformation which can be observed for last two decades has great importance in the development of plant science and agriculture. So far, non-vector techniques, particularly direct gene transfer using „gene gun”, have been often applied in cereals transformation. However, agrobiotechnology achievements enabled cereals transformation with the soil bacterium Agrobacterium tumefaciens. Initially, it was believed that this technique cannot be applied to cereals because monocotyledones are outside the host range of the crown gall disease. Nowadays, the top five cereals with the highest economic significance – rice (Oryza sativa L.), maize (Zea mays L.), wheat (Triticum aestivum L.), barley (Hordeum vulgare L.) and sorghum (Sorghum bicolor L.) are quite efficiently transformed by A. tumefaciens. By means of molecular genetic tools it is possible to obtain cereals with new, improved traits. The present paper is focused on agricultural development which can by observed by the application of GM cereals tolerant to biotic and abiotic stress factors. Moreover, we summarized the latest achievements in cereals transformation.

scholarly journals Effect of Sodium Silicate and Salicylic Acid on Sodium and Potassium Ratio in Wheat (Triticum aestivum L.) Grown Under Salt Stress

2021 ◽  
Author(s):  
Ayesha Mushtaq ◽  
Nazish Sabir ◽  
Tasneem Kousar ◽  
Sabeena Rizwan ◽  
Uzma Jabeen ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Salt Stress ◽  
Sodium Silicate ◽  
Growth Parameters ◽  
Sodium Concentration ◽  
Triticum Aestivum L ◽  
Growth And Yield ◽  
Wheat Varieties ◽  
Wheat Genotypes ◽  
Normal Environment

Abstract Purpose Salinity pose severe threat to cultivation as it drastically affects the plant sustainability and yield. The intended aim of current consensus is to assess effects of sodium silicate and salicylic acid on wheat genotypes (slat tolerant and salt sensitive) grown under salt. Methods This experiment was designed to check the effect of silicon on wheat varieties, so four different wheat genotypes named as (Umeed, Rasco, Zarghoon and Shahkaar) were grown in hydroponics under saline and normal environment. Sodium silicate and salicylic acid were applied on all varieties to determine the slat tolerance ability. Plants were harvested at maturity and different physical and chemical aspects were recorded. Results To assess the salt stress on growth and yield of wheat genotypes. Wheat grown in saline conditions with sodium silicate supplementation showed improvement in all growth parameters as compared to the plants grown under salt stress without silicon supplementation. Higher contents of potassium were observed in plants grown under salt stress with silicon supplementation however, potassium concentration was found less in salicylic acid treatment and control under salt stress. Sodium concentration was found higher under salt stress but sodium silicate application reduced Na+ uptake under salt stress. Significance increase in K+ : Na+ ratio in roots enhance the translocation which in turn elevates salt tolerance ability. Among wheat varieties potassium uptake was quite high in Umeed and Rasco as compared to Zarghoon and Shahkar. Conclusion Based on current results it can be deduced that application of sodium silicate on different wheat varieties mitigated Na+ toxicity by elevating K+: Na+ ratio and net translocation rate in salt stressed plants.

scholarly journals Application of sewage sludge combined with thiourea improves the growth and yield attributes of wheat (Triticum aestivum L.) genotypes under arsenic-contaminated soil

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259289
Author(s):  
Nida Mansoora ◽  
Shameem Kausar ◽  
Syeda Fasiha Amjad ◽  
Samia Yaseen ◽  
Huma Shahid ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Dry Weight ◽  
Triticum Aestivum L ◽  
Growth And Yield ◽  
Maximum Increase ◽  
Wheat Varieties ◽  
Yield Attributes ◽  
Growth Attributes ◽  
As Stress ◽  
As Toxicity

Arsenic (As) contamination is a serious threat to agriculture and human health worldwide. It can adversely affect the growth attributes of food crops. On the other hand, using thiourea (TU) to ameliorate As stress is an economically consistent approach. However, there is a knowledge gap regarding the combined use of TU and Sewage sludge (SS). SS is considered important, unutilized biomass. It can be used as a fertilizer that has high organic matter and nutrients. Therefore, the current study was performed to evaluate TU and SS sole and combined responses under As toxicity on two wheat genotypes (Markaz 19 and Ujala 16). There were four treatments control (As 50 mg kg-1), SS (30 g kg−1)+TU (6.5 mM)+As, TU+As and SS+As applied with four replications. Results revealed that SS+TU performed significantly better over SS, TU and control for improvement in root and shoot fresh and dry weight of wheat varieties Markaz 19 and Ujala 16 under As toxicity. A significant decrease in POD, SOD and APX of Markaz 19 and Ujala 16 also validated the effective functioning of SS+TU over control. The maximum increase of 71 and 77% was noted in phosphorus, where SS+TU was applied over control in Markaz 19 and Ujala 16, respectively. In conclusion, SS+TU is a better approach than the sole application of SS and TU under As contamination for improvement in wheat growth attributes. More investigations are recommended at the field level under different As contamination and agro-climatic zones to declare SS+TU an effective amendment to mitigate As toxicity in wheat.

Temperature dependence of wheat development

2008 ◽  
Vol 56 (3) ◽  
pp. 313-320 ◽  
Author(s):  
K. Balla ◽  
O. Veisz
Keyword(s):  
Heat Stress ◽  
Abiotic Stress ◽  
High Temperatures ◽  
Substantial Reduction ◽  
Vegetation Period ◽  
Stress Factors ◽  
Wheat Varieties ◽  
Rapid Decomposition ◽  
Abiotic Stress Factors ◽  
Temperature Levels

Among the abiotic stress factors influencing the growth and productivity of wheat varieties, extremely high temperatures have the most limiting effect. In an experiment set up in the gradient chamber of the Martonvásár phytotron to test the effect of various temperatures on four winter wheat varieties and one variety of spelt, substantial differences were observed in the heat stress tolerance of the varieties. There was a considerable reduction in the number of shoots and spikes as the result of heat stress, leading to a drastic loss of grain yield. It was clear from changes in the biomass and in the grain:straw ratio that extremely high temperatures led to a substantial reduction in the ratio of grain to straw in the varieties tested. In response to high temperature the wheat plants turned yellow earlier due to the rapid decomposition of the chlorophyll content. This resulted in a considerable shortening of the vegetation period and early ripening. Reductions in the parameters tested were observed at different temperature levels for each variety, indicating considerable differences in the ability of the varieties to adapt to abiotic stress factors.

Effects of abiotic stress on anthocyanin accumulation and grain weight in purple wheat

2018 ◽  
Vol 69 (12) ◽  
pp. 1208 ◽  
Author(s):  
Xiaolan Li ◽  
Xiang Lv ◽  
Xiaohong Wang ◽  
Liaohong Wang ◽  
Mingsheng Zhang ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Molecular Mechanisms ◽  
Triticum Aestivum L ◽  
Nacl Stress ◽  
Grain Weight ◽  
Stress Factors ◽  
Anthocyanin Content ◽  
Anthocyanin Accumulation ◽  
Peg 6000 ◽  
Abiotic Stress Factors

This study explored the effects of abiotic stress on anthocyanin accumulation and grain weight of purple wheat (Triticum aestivum L. cv. Guizi 1). Plants were treated with five abiotic stress factors at different developmental periods of the grain, then mature grains were analysed for anthocyanin content and 1000-grain weight (TGW). Stresses included temperature (cold and heat), light (shading irradiance and continuous irradiance), drought (20 and 40mm PEG 6000), salinity (100 and 200mm NaCl), and wounding (four types). Of all treatments, 25% tended to increase both anthocyanin content and TGW, although only 5% reached a significant level, 27.5% decreased both, 40% increased anthocyanins but decreased TGW, and 7.5% increased TGW but decreased anthocyanins. Heat stress tended to increase anthocyanin content and decrease TGW, whereas cold stress increased anthocyanins only at 15 days post-anthesis (DPA) and decreased both traits at other times. Shading irradiance decreased anthocyanins but had little effect on TGW. Continuous irradiance increased anthocyanins and TGW at 35 DPA but decreased both at 10 DPA. The lower levels of drought (20mm PEG 6000) and salinity (100mm NaCl) stress tended to increase anthocyanins and decrease TGW; however, the effects of 40mm PEG 6000 and 200mm NaCl were different, and were period-dependent. The four types of wounds increased anthocyanins and TGW at 30 DPA, but their individual effects were different in the other four periods. The results quantified the effects of five abiotic stress factors on anthocyanin accumulation and grain weight, and provide the foundation for further study of defence-responsive molecular mechanisms of abiotic stress in purple wheat.

scholarly journals Comparative Transcriptome Analysis in Homo- and Hetero-Grafted Cucurbit Seedlings

2021 ◽  
Vol 12 ◽  
Author(s):  
Filippos Bantis ◽  
George Tsiolas ◽  
Evangelia Mouchtaropoulou ◽  
Ioanna Tsompanoglou ◽  
Alexios N. Polidoros ◽  
...  
Keyword(s):  
Molecular Mechanisms ◽  
Citrullus Lanatus ◽  
Stress Factors ◽  
Differentially Expressed ◽  
Growth And Yield ◽  
Abiotic Stress Factors ◽  
Cytokinin Synthesis ◽  
Nutritional Benefits ◽  
Functional Analyses ◽  
Transcriptome Level

Watermelon (Citrullus lanatus) is a valuable horticultural crop with nutritional benefits grown worldwide. It is almost exclusively cultivated as grafted scions onto interspecific squash rootstock (Cucurbita maxima × Cucurbita moschata) to improve the growth and yield and to address the problems of soilborne diseases and abiotic stress factors. This study aimed to examine the effect of grafting (homo- and hetero-grafting) on the transcriptome level of the seedlings. Therefore, we compared homo-grafted watermelon (WW) with non-grafted watermelon control (W), homo-grafted squash (SS) with non-grafted squash control (S), hetero-grafted watermelon onto squash (WS) with SS, and WS with WW. Different numbers of differentially expressed genes (DEGs) were identified in each comparison. In total, 318 significant DEGs were detected between the transcriptomes of hetero-grafts and homo-grafts at 16 h after grafting. Overall, a significantly higher number of downregulated transcripts was detected among the DEGs. Only one gene showing increased expression related to the cytokinin synthesis was common in three out of four comparisons involving WS, SS, and S. The highest number of differentially expressed (DE) transcripts (433) was detected in the comparison between SS and S, followed by the 127 transcripts between WW and W. The study provides a description of the transcriptomic nature of homo- and hetero-grafted early responses, while the results provide a start point for the elucidation of the molecular mechanisms and candidate genes for the functional analyses of hetero-graft and homo-graft systems in Cucurbitaceae and generally in the plants.

GRAFTED TOMATOES – ECOLOGICAL ALTERNATIVE FOR CHEMICAL DISINFECTION OF SOIL

2020 ◽  
Author(s):  
Dorin Sora ◽  
Mădălina Doltu
Keyword(s):  
Fruit Quality ◽  
Mineral Elements ◽  
Stress Factors ◽  
Vegetable Crops ◽  
Biotic And Abiotic Stress ◽  
Solanum Lycopersicum L ◽  
Abiotic Stress Factors ◽  
Increase Productivity ◽  
Tomato Cultivars ◽  
Chemical Disinfection

This study aimed to identification of an ecological alternative for the chemical disinfection of soil in the greenhouses from Romania. Tomato (Solanum lycopersicum L.) is one of the most popular vegetable crops in the world. The carbohydrate, vitamins, salts of important mineral elements and organic acids content of tomato fruits is very important. Tomato crops are very sensitive to climatic vagaries, so fluctuation in climatic parameters at any phase of growth can affect the yield and the fruit quality. Grafting on Solanaceae is a method which has improved and spread quickly during the past years, a similar approach to crop rotation, a practice meant to increase productivity, resistance or tolerance to biotic and abiotic stress factors and at increasing fruit quality. The research was conducted in a glass greenhouse of the Horting Institute, Bucharest, Romania. The biological material used was a Romanian tomato hybrid (Siriana F1), a Dutch tomato hybrid (Abellus F1) and four rootstocks, a Dutch tomato hybrid (Emperador F1) and three Romanian tomato cultivars (L542, L543 and L544) obtained from the Research and Development Station for Vegetable Growing, Buzău, Romania. The rootstocks have had resistance to biotic stress factors (soil diseases and pests) and the chemical disinfection of soil has was eliminated. The result of this research are presented in this paper.

Characterization of elite bread wheat (Triticum aestivum L.) germplasm for spot blotch Bipolaris sorokiniana (Sacc.) Shoemaker resistance

2021 ◽  
pp. 1-8
Author(s):  
Deep Shikha ◽  
Chandani Latwal ◽  
Elangbam Premabati Devi ◽  
Anupama Singh ◽  
Pawan K. Singh ◽  
...  
Keyword(s):  
Abiotic Stress Tolerance ◽  
Bipolaris Sorokiniana ◽  
Triticum Aestivum L ◽  
Spot Blotch ◽  
Biotic And Abiotic Stress ◽  
Wheat Varieties ◽  
Effective Measure ◽  
Breeding Lines ◽  
Elite Breeding Lines ◽  
Germplasm Accessions

Abstract Genetic resources are of paramount importance for developing improved crop varieties, particularly for biotic and abiotic stress tolerance. Spot blotch (SB) is a destructive foliar disease of wheat prevalent in warm and humid regions of the world, especially in the eastern parts of South Asia. For the management of this disease, the most effective measure is the development of resistant cultivars. Thus, the present investigation was carried out to confirm SB resistance in 200 germplasm accessions based on phenotypic observations and molecular characterization. These elite breeding lines obtained from the International Centre for Maize and Wheat Improvement, Mexico, are developed deploying multiple parentages. These lines were screened for SB resistance in the field under artificially created epiphytotic conditions during 2014–15 and 2015–16 along with two susceptible checks (CIANO T79 and Sonalika) and two resistant checks (Chirya 3 and Francolin). Eighty-two out of 200 germplasm accessions were found resistant to SB and resistance in these lines was confirmed with a specific SSR marker Xgwm148. Three accessions, VORONA/CNO79, KAUZ*3//DOVE/BUC and JUP/BJY//URES/3/HD2206/HORK//BUC/BUL were observed possessing better resistance than the well-known SB-resistant genotype Chirya3. These newly identified resistant lines could be used by wheat breeders for developing SB-resistant wheat varieties.

scholarly journals EMS Derived Wheat Mutant BIG8-1 (Triticum aestivum L.)—A New Drought Tolerant Mutant Wheat Line

2021 ◽  
Vol 22 (10) ◽  
pp. 5314
Author(s):  
Marlon-Schylor L. le Roux ◽  
Nicolas Francois V. Burger ◽  
Maré Vlok ◽  
Karl J. Kunert ◽  
Christopher A. Cullis ◽  
...  
Keyword(s):  
Amino Acids ◽  
Water Deficit ◽  
Triticum Aestivum L ◽  
Water Deficit Stress ◽  
Drought Response ◽  
Fibrous Root ◽  
Wheat Varieties ◽  
Breeding Programs ◽  
Response Characteristics ◽  
Drought Tolerant

Drought response in wheat is considered a highly complex process, since it is a multigenic trait; nevertheless, breeding programs are continuously searching for new wheat varieties with characteristics for drought tolerance. In a previous study, we demonstrated the effectiveness of a mutant known as RYNO3936 that could survive 14 days without water. In this study, we reveal another mutant known as BIG8-1 that can endure severe water deficit stress (21 days without water) with superior drought response characteristics. Phenotypically, the mutant plants had broader leaves, including a densely packed fibrous root architecture that was not visible in the WT parent plants. During mild (day 7) drought stress, the mutant could maintain its relative water content, chlorophyll content, maximum quantum yield of PSII (Fv/Fm) and stomatal conductance, with no phenotypic symptoms such as wilting or senescence despite a decrease in soil moisture content. It was only during moderate (day 14) and severe (day 21) water deficit stress that a decline in those variables was evident. Furthermore, the mutant plants also displayed a unique preservation of metabolic activity, which was confirmed by assessing the accumulation of free amino acids and increase of antioxidative enzymes (peroxidases and glutathione S-transferase). Proteome reshuffling was also observed, allowing slow degradation of essential proteins such as RuBisCO during water deficit stress. The LC-MS/MS data revealed a high abundance of proteins involved in energy and photosynthesis under well-watered conditions, particularly Serpin-Z2A and Z2B, SGT1 and Calnexin-like protein. However, after 21 days of water stress, the mutants expressed ABC transporter permeases and xylanase inhibitor protein, which are involved in the transport of amino acids and protecting cells, respectively. This study characterizes a new mutant BIG8-1 with drought-tolerant characteristics suited for breeding programs.

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