Yazar "EL SABAGH, Ayman" seçeneğine göre listele

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    Drought and salinity stresses in barley: Consequences and mitigation strategies
    (2019) EL SABAGH, Ayman; Hossain, Akbar; Islam, Md. Shohidul; Barutçular, Celaleddin; Hussain, Saddam; Hassannuzzaman, Mirza; Akram, Tauseef; Mubeen, Muhammad; Nasim, Wajid; Fahad,Shah; Kumar, Narendra; Meena,Ram Swaroop; Kızılgeçi, Ferhat; Yıldırım, Mehmet; Ratnasekera, Disna; Saneoka, Hirofumi
    Recent trends show reductions in crop productivity worldwide due to severe climatic change. Different abiotic stresses significantly affect the growth and development of plants, leading to decreased crop yields. Salinity and drought stresses are the most common abiotic stresses, especially in arid and semi–arid regions, and are major constraints for barley production. The present review attempts to provide comprehensive information related to barley plant responses and adaptations to drought and salinity stresses, including physiological and agronomic, in order to alleviate the adverse effect of stresses in barley. These stresses reduce assimilation rates, as they decrease stomatal conductance, disrupt photosynthetic pigments, reduce gas exchange, enhance production of reactive oxygen species, and lead to decreased plant growth and productivity. This review focuses on the strategies plants use to respond and adapt to drought and salinity stress. Plants utilize a range of physiological and biochemical mechanisms such as adaptation strategies, through which the adverse effects can be mitigated. These include soil management practices, crop establishment, as well as foliar application of anti-oxidants and growth regulators that maintain an appropriate level of water in the leaves to facilitate adjustment of osmotic and stomatal performance. The present review highlighted the adverse effect of drought and salinity stresses barley and their mitigation strategies for sustainable barley production under changing climate. They review also underscored that exogenous application of different antioxidants could play a significant role in the alleviation of salinity and drought stress in plant systems.
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    ENHANCING DROUGHT TOLERANCE IN CAMELINA SATIVA L. AND CANOLA (BRASSICA NAPUS L.) THROUGH APPLICATION OF SELENIUM
    (2020) Ahmad, Zahoor; Waraich, Ejaz Ahmad; Barutçular, Celaleddin; Alharby, Hesham; Bamagoos, Atif; Kızılgeçi, Ferhat; Öztürk, Ferhat; Hossain, Akbar; Bayoumi, Yousry; EL SABAGH, Ayman
    Considering the burning issue the present study was undertaken in pot culture at the Cholistan Institute of Desert Studies (CIDS), The Islamia University of Bahawalpur, Pakistan for enhancing drought tolerance in two oilseed crops (OC) crops camelina (Camelina sativa L.) and canola (Canola napus L.) through improving physiological, biochemical, and antioxidants activity by foliar application of selenium (Se) under drought stress. Two Camelina (i.e., ‘Australian Camelina’ and ‘Canadian Camelina’) and canola genotypes (i.e., ‘AARI Canola’ and ‘UAF Canola’) were used as plant materials during the growing season of 2016. Both Camelina and Canola genotypes were grown under normal (100% FC) and water deficit (drought stress) (40% FC) conditions. Four levels of Se: such as seeds priming with 75μM Se, foliar application of Se at 7.06 μM and foliar Se in combination with seeds priming (7.06 μM & 75μM) along with control were applied at the vegetative stage of both OC crops for screening drought tolerant genotypes. All treatments were arranged three times in a randomized complete block design. Both OC crops were grown upto the maturity and data on physiochemical, antioxidants and yield components were recorded during this study. Results of the present study indicated that the physio-biochemical parameters such as WP (water potential), OP (osmotic potential), TP (turgor pressure), proline, TSS (total soluble sugar), TFAA (total free amino acids), TPr (total proteins) and TS (total sugars); and total chlorophyll contents were improved by foliar application Se along with seed priming by Se in both OC crops in both drought stress and non-stress (control) conditions. Similarly, osmoprotectants such as GB (Glycinebetaine), anthocyanin, TPC (total phenolic contents) and flavonoids; as well as antioxidants such as APX (ascorbate peroxidase), SOD (superoxide dismutase), POD (peroxidase) and CAT (catalase) were also showed better enhancement in both OC crops through foliar application in combination with seed priming with Se (7.06 μM & 75μM) under normal as well as water deficit (drought) conditions. Yield and its components i.e., branches plant-1 (no.), 1000-seed weight (g), seed and biological yield (t ha-1 ) of both OC crops were increased through foliar application in combination with seed priming by Se (7.06 μM & 75μM) under drought and non-drought stress conditions. Both camelina and Canola genotypes categorized based on all the above-mentioned parameters under the water deficit (drought stress) condition and foliar application of Se, the genotype ‘Canadian Camelina’ maintained the highest values for all these attributes. Therefore, it is revealed that foliar application in combination with seed priming by Se helps to improve drought tolerance of OC crops and also leads to an increase in the productivity of crops under drought stress. Among the genotypes, ‘Canadian Camelina’ performed the best when seeds of the genotypes were primed with Se in combination with foliar application of Se at the vegetative stage.
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    EVALUATING SHORT STATURE AND HIGH YIELDING MAIZE HYBRIDS IN MULTIPLE ENVIRONMENTS USING GGE BIPLOT AND AMMI MODELS
    (2020) Ahmed, Asgar; Hossain, Akbar; AMIRUZZAMAN, Muhammad; ALAM, Md. Ashraful; FAROOQ, Muhammad; EL SABAGH, Ayman; Kızılgeçi, Ferhat
    In Bangladesh, maize stands second place after rice; since it faces diverse natural calamities during its highest growing season (rabi/winter), particularly strong storm during the reproductive stage. Sometimes in some regions, this crop is completely damaged by natural disasters. Considering the burning issue, thirteen hybrids, including 10 previously selected short stature hybrids were evaluated against three local and standard checks: ‘BHM-9’, ‘981’ and ‘Sunshine’ in two consecutive years in seven locations of Bangladesh. Combined analysis over locations and seasons instigated that genotypes ‘Sunshine’, ‘981’ and ‘G10’ were the top-high yielders, while genotypes ‘G1’, ‘G2’, ‘BHM-9’ and ‘Sunshine’ were found the most stable. On the other hand, five genotypes such as ‘G3’, ‘G4’, ‘G6’, ‘G8’ and ‘G9’ had the below-average mean yield and the genotypes ‘G6’ and ‘G9’ were the most unstable. Among the seven environments, Jamalpur, Joydebpur and Dinajpur were most discriminating and Ishwardi was the least discriminating; whereas Joydebpur was more representative and Borishal was the least representative of other test environments. In the case of plant and ear height, most of the genotypes showed a lower value than all the checks, which was desirable. But among the top three high yielders, local cross-genotype, the ‘G10’ had the lowest and more stable value for both plant height and ear height. Therefore, considering the plant and ear height, grain yield, and yield stability, the genotype ‘G10’ has been recommended for release as commercial variety and has been released as new maize variety in Bangladesh with the local name of ‘BARI Hybrid Maize-16’ (BHM-16).
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    PHENOLOGY, GROWTH AND YIELD ARE STRONGLY INFLUENCED BY HEAT STRESS IN LATE SOWN MUSTARD (BRASSICA SPP.) VARIETIES
    (2020) Bazzaz, Md., Mahfuz; Hossain, Akbar; FAROOQ, Muhammad; Alharby, Hesham; Bamagoos, Atif; Nuruzzaman, Md; Khanum, Mahbuba; Hossain, Md. Monwar; Kızılgeçi, Ferhat; Öztürk, Ferhat; Çığ, Fatih; EL SABAGH, Ayman
    In rice-based cropping system of northern Bangladesh, mustard planting is delayed due to late harvest of monsoon rice (Transplanted Aman rice; T. Aman rice). The late sown mustard is often exposed to high-temperature stress during the reproductive stage, which causes a significant decrease in seed yield. Most of the farmers plant a low yielding local mustard variety ‘Tori-7’, which is sensitive to high-temperature stress. The Oil Seeds Research Centre of Bangladesh Agricultural Research Institute has recently released short duration and high-yielding mustard varieties for the rice-based cropping system of northern Bangladesh to tackle this issue. However, the performance of these varieties in the target cropping system under late sown conditions (together with exposure to heat stress) has not been evaluated yet. Therefore, this two year field experiment was conducted to assess the performance of newly released mustard varieties ‘BARI Sarisha-14’ and ‘BARI Sarisha-15’ in comparison with the local check variety ‘Tori-7’ sown at five planting dates (viz. October 21, November 1, November 10, November 20, and November 30). The delay in sowing shortened time (days) to flowering and maturity, regardless of the variety. Similarly, plant height, branches/plant and total dry matter accumulation of the tested varieties were also reduced upon delay in planting. The greatest seed yield was observed in varieties ‘BARI Sarisha-15’ and ‘BARI Sarisha-14’ when sown on October 21. These two varieties produced fair seed yield when sown at November 20. However, the local variety ‘Tori7’ yielded the least across all the planting dates. Therefore, the varieties ‘BARI Sarisha-14’ and ‘BARI Sarisha-15’ may be planted in the rice-based cropping system of northern Bangladesh after harvest of T. Aman rice to get maximum seed yield
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    YIELD AND GRAIN PROTEIN OF WHEAT (TRITICUM AESTIVUM L.) IS INFLUENCED BY THE APPLICATION OF DIFFERENT LEVELS OF NITROGEN
    (2020) Jahan, Abu Hena Sorwar; Hossain, Akbar; Nur, Alam; Hasib, bin Saif; Ahsan, Ali; Kızılgeçi, Ferhat; Konuşkan, Ömer; Barutçular, Celaleddin; EL SABAGH, Ayman
    Malnutrition is one of the major problems in the poor people of Bangladesh. There are some reports that additional nitrogen (over than recommended does) application to wheat plants result in more pro tein content in wheat grain. To justify these phenom ena, the experiment was conducted in consecutive two years (2015-16 and 2016-17) at two locations (Gazipur and Dinajpur) during rabi season (Novem ber to March each year). There were used six nitro gen (N) treatments, such as 0, 100, 125, T3; 150, 175 and 200 kg N ha-1 . In the study, wheat cultivated at Dinajpur location exhibited more spikes m-2 , spike length, spikelets spike-1 , grains spike-1 , 1000-grain weight and higher grain yield in both years than Gazipur location. Considering combined N levels over the locations, the highest grain protein (14 %) as well as grain yield (5.00 t ha-1 ) was estimated when 200 kg N ha-1 was applied. In economics point of view, 200 kg N ha-1 application also gave the max imum (BCR, 1.21) followed by 175 kg N ha-1 (1.20) and 150 kg N ha-1 1.20). Whereas, the maximum MBCR was found in 100 kg N ha-1 (15.63). There fore, to minimize malnutrition severity among the children as well as adult people in the developing countries like Bangladesh, 175 or 200 kg N ha-1 may be applied in wheat to increase percentage protein in wheat grain.