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drought

drought的相关文献在1988年到2023年内共计216篇,主要集中在肿瘤学、农作物、大气科学(气象学) 等领域,其中期刊论文216篇、相关期刊51种,包括棉花学报、华北农学报、大气科学进展:英文版等; drought的相关文献由811位作者贡献,包括Berhanu F. Alemaw、Estri Laras Arumingtyas、Matthew W. Blair等。

drought—发文量

期刊论文>

论文:216 占比:100.00%

总计:216篇

drought—发文趋势图

drought

-研究学者

  • Berhanu F. Alemaw
  • Estri Laras Arumingtyas
  • Matthew W. Blair
  • Arthur W. Sichangi
  • Damba Yahaya
  • Dennis C. Gitz III
  • Emmanuel C. Okogbue
  • Evika Sandi Savitri
  • Guoxin Shen
  • Hong Zhang
  • 期刊论文

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    • Yan Wan; Yuan Liang; Xuxiao Gong; Jianyong Ouyang; Jingwei Huang; Xiaoyong Wu; Qi Wu; Changying Liu; Xueling Ye; Xiaoning Cao; Gang Zhao; Liang Zou; Dabing Xiang
    • 摘要: Tartary buckwheat(Fagopyrum tataricum)is an important pseudocereal feed crop with medicinal and nutritional value.Drought is one of the main causes of reduced growth and yield in these plants.We investigated the growth,physiological,and metabolic responses of the widely promoted Tartary buckwheat variety Chuan Qiao No.1 to polyethylene glycol(PEG)-mediated drought stress.Drought significantly decreased shoot length,shoot biomass and relative water content.Root length,malondialdehyde content,electrolyte leakage,activities of superoxide dismutase,peroxidase,catalase and amylase,and contents of soluble sugar,soluble protein and proline were increased by PEG-mediated drought.Untargeted metabolomics analysis identified 32 core metabolites in seedlings subjected to PEG-mediated drought,16 of which increased—including quercetin,isovitexin,cyanidin 3-O-beta-D-glucoside,L-arginine,and glycerophosphocholine,while the other 16 decreased—including 3-methoxytyramine,2,6-diaminopimelic acid,citric acid,UDP-alpha-D-glucose,adenosine,keto-D-fructose.The 32 core metabolites were enriched in 29 metabolic pathways,including lysine biosynthesis,citrate(TCA)cycle,anthocyanin biosynthesis,and aminoacyl-tRNA biosynthesis.Among them,taurine and hypotaurine metabolism,flavor and flavor biosynthesis,indole alkaline biosynthesis,and alanine,aspartate and glutamate metabolism were the four main metabolic pathways affected by drought.Our findings provide new insights into the physiological and metabolic response mechanisms of Tartary buckwheat to drought stress.
    • JINXIAN LIU; JINGFANG FENG; CHANG ZHANG; YONGJUAN REN; WEIHUA SU; GUANGHENG WU; XIANYU FU; NING HUANG; YOUXIONG QUE; HUI LING; JUN LUO
    • 摘要: Calmodulin(CaM)proteins play a key role in signal transduction under various stresses.In the present study,the effects of a sugarcane ScCaM gene(NCBI accession number:GQ246454)on drought and salt stress tolerance in transgenic Arabidopsis thaliana and Escherichia coli cells were evaluated.The results demonstrated a significant negative role of ScCaM in the drought and salt stress tolerance of transgenic lines of A.thaliana,as indicated by the phenotypes.In addition,the expression of AtP5CS and AtRD29A,two genes tightly related to stress resistance,was significantly lower in the overexpression lines than in the wild type.The growth of E.coli BL21 cells expressing ScCaM showed weaker tolerance under mannitol and NaCl stress.Taken together,this study revealed that the ScCaM gene plays a negative regulatory role in both mannitol and NaCl stresses,and it possibly exerts protective mechanisms common in both prokaryotes and eukaryotes under stress conditions.
    • Yarou Halissou; Alamou Adéchina Eric; Biao Iboukoun Eliézer; Obada Ezéchiel; Tore Daniel Bio; Afouda Abel
    • 摘要: In the context of a changing climate,the Beninese Niger River basin has been the focus of several research studies for the quantification,planning,and modeling of water and related resources for sustainable use.This re­search aims to characterize the historical(1976-2019)and projected(2021-2050)hydrological drought of the Beninese Niger River basin.The study used daily observations of rainfall,maximum and minimum temperatures,runoff rates and simulations of HIRHAM and REMO RCMs from fifteen(15)rainfall stations installed around the basin.It uses standardized stream­flow indices(SDI)at 12-month and 36-month time steps.The results show that the calculated SDI indices show,on average,for all the model scenar­ios used,chronological trends of increase.These increases are not signifi­cant(are of the order of 0.00001 per year).The analysis of the SDI indices shows that,on average,the hydrological droughts in the Beninese basin of the Niger River will increase at 36 months and decrease at 12 months of the SDI.In fact,these small variations of hydrological droughts will be ac­companied by the increase of their duration and the decrease of their mag­nitudes.The droughts detected in the Benin basin of the Niger River during the historical period will continue until 2050 in the same range but with more extended drought lengths.It should be noted that most of the changes observed in the calculated and analyzed indices are not significant.
    • Penghui TANG; Guoqiang CHEN; Liangju ZHAO; Cong LIU; Yanyuan WU
    • 摘要: The GM(1,1)grey model was used to simulate and divide the harvest years of black-skinned sugarcane yield in Wengyuan County during 2006-2021.Based on the meteorological observation data of Wengyuan County during the same period,the impact of major meteorological disasters such as drought,flood and frost in the growth period of black-skinned sugarcane was analyzed.It is believed that the instability of black-skinned sugarcane yield was affected by comprehensive meteorological factors.It is necessary to master the characteristics of local meteorological disasters,conduct scientific cultivation according to local conditions,and continuously improve the meteorological service level of black-skinned sugarcane cultivation.
    • Berhanu F. Alemaw
    • 摘要: This study is motivated to highlight the variability of recent drought hotspots in the region of southern Africa in terms of the seasonal and annual rainfall regimes and their possible spatial linkage with the 1950-2020 seasonal El Niño/Southern Oscillation (ENSO). Some evidence is found on possible links between the occurrence of drought hotspots in the region in terms of seasonal and mean annual runoff and warm ENSO events. This was revealed by the existence of a strong and nearly-strong positive linear correlation between Seasonal and annual rainfall depths and the warm seasonal ENSO indices explained by the southern oscillation index represented by the sea level pressure (SLP) anomalies data obtained from the National Oceanographic and Aeronautics Administration (NOAA). Considering the entire southern African region, 41% of the surface areas exhibit moderate (r > 0.25) and strong (r > 0.5) correlation coefficients in terms of the December to February quarter rainfall and ENSO indices. Above 50% confidence interval in the correlation between seasonal rainfall and ENSO during DJF quarters is found in 74% of the surface area of the region of southern Africa. The high confidence interval of the positive correlation coefficients is an indication that substantial variance of precipitation during ENSO years is accounted for by the warm ENSO events. The areas with pronounced lower rainfalls and droughts associated with ENSO activity in the region include larger and some pockets of various countries in southern Africa, including but not limited to Angola, Botswana, Lesotho, Namibia, Zambia, Zimbabwe, South Africa and Mozambique. The recent drought events of 2019/2020, and previously in 2015/16 in this region with wider regional impacts can be explained by the ENSO phenomena.
    • Fatemeh Zarinkamar; Reyhaneh Medhat; Maryam Rezayian
    • 摘要: Trigonella persica is a valuable medicinal plant which comprises trigonelline that is secondary metabolite and important component in cosmetic and medicine.This research was conducted in order to evaluation the drought stress effect on growth parameters,root anatomical changes and trigonelline content in T.persica.Plants were grown under soil moisture corresponding to 100%,75%,50%and 25%field capacity for two weeks.The data showed that drought stress was significantly decreased fresh weight and dry weight of shoot and root.In addition,leaf area was declined due to drought stress.Interestingly,root length was enhanced by drought stress.Root microscopic study demonstrated that drought stress increased thickness of epidermal,endodermal,vascular bundle,central cylinder and parenchyma in T.persica.Drought stress caused a significant increment in alkaloid and trigonelline content in aerial parts and roots of T.persica.These results revealed that T.persica responded to drought stress by increasing the alkaloid and trigonelline,as well as the anatomical changes in root.Considering the importance of trigonline and alkaloids,this work may open prospects for production of the pharmaceutically valuable secondary metabolites thereby drought stress.
    • Gehan H. Abd El-Aziz; Ahmed S. Ibrahim; Ashraf H. Fahmy
    • 摘要: The use of natural hydrogels in agriculture provides solutions to many problems without threatening the environment. This study aims to evaluate the potential impact of environmentally friendly hydrogels (pectin, starch and pectin + starch) in reducing the negative effects of drought stress on tomato yield and quality. Two different peels (orange peel and banana peel) are used to prepare environmentally friendly hydrogels. The water retention efficiency of hydrogels has been studied. Greenhouse experiment for tomato under drought stress was conducted during 2019. These hydrogels were used under several level of irrigation (100%, 75%, and 50% FC), soil without hydrogel was used as a control. The results showed that the eco-friendly hydrogels (starch, pectin, and pectin + starch) had capacity retention of water for a long time. The obtained data from the greenhouse experiment showed that the eco-friendly hydrogel showed a positive effect on retention of water and increase the soil moisture content compared to control. The highest increase was observed at pectin + starch treatment. This increase reached to 2.8-, 2.4- and 2.0-fold for 100%, 75% and 50% FC compared to the control. Eco- friendly hydrogel application under different drought conditions led to improve yield and quality of tomato fruits. Moreover, conversion of agricultural wastes to hydrogels and the use of these eco-friendly materials instead of synthetic hydrogels are necessary to utilize the limited natural resources and decrease the harmful impact of agricultural wastes on the environment and pave the way for the transition to a sustainable agriculture system.
    • Bingjie Xu; Min Gao; Wei Hu; Wenqing Zhao; Shanshan Wang; Zhiguo Zhou
    • 摘要: As the main byproduct of cotton production,cottonseed yields edible vegetable oil,ruminant feed,and industrial products.We evaluated the individual and interactive effects of elevated air temperature and soil drought on cottonseed yield and nutritional quality using two cotton cultivars,Sumian 15(heat-susceptible)and PHY370 WR(heat-tolerant).The experiment was conducted under three levels of soil relative water content(SRWC):(75±5)%,(60±5)%and(45±5)%and two temperature regimes:ambient temperature(AT,31.0/26.4°C,mean daytime/night temperature)and elevated temperature(ET,33.4/28.9°C).Cottonseed yield,boll number,seed number,and single-seed weight were lower under combined ET and SRWC(45±5)%than either individual stress or combined stresses in comparison with the control treatment(SRWC(75±5)%under AT).Drought tended to increase oil content and reduce protein content,whereas ET showed almost the opposite effects.Under the combination of ET and soil drought,oil content was still higher than under control,although ET weakened the beneficial effects of drought.For protein,ET offset the negative impacts of mild drought on protein content,but protein content was not increased under SRWC(45±5)%.Each stress or combined stress reduced oil and protein yields under all treatments,owing to declines in cottonseed yields.The combined stress reduced unsaturated fatty acid(UFA)/saturated fatty acid(SFA)and essential amino acid(EAA)/non-essential amino acid(NAA).Compared with PHY370 WR,the sensitivity of Sumian 15 to the combined factors was evidenced in the following ways:(1)seed yield,yield components,oil and protein yields were decreased more for Sumian 15 than PHY370 WR compared with the control treatment;(2)the combined stresses caused lower oil content,UFA,and UFA/SFA in Sumian 15 than PHY370 WR;(3)interaction effects of the combined factors on protein content and EAA/NAA were detected only in Sumian 15.
    • JAMSHIDI Alireza; JAMSHIDI Masomeh; ABADI Bijan
    • 摘要: The decisions made by agricultural households to adjust to climate change(CC)in Iran are not well known.This study is intended to investigate the influence of perceptions and socioeconomic,institutional features on farmers’adaptation decisions about CC,which constitute the hypothetical statements of the study.We undertook a survey of 200 farm householders from 31 villages of Ilam Province,situated in the western Iran,as randomly selected.The result discloses that the proposed discriminant model matches the dataset well,with a strong effect size of partial eta-squared(η^(2)=0.38).The analysis further signals that adapters are younger and more welleducated than non-adapters.Adapters are also knowledgeable about CC risks and institutional policy barriers.The adapters have subsidiary work,better access to credit,and have good contacts with expansion agents and specialists.The paper concludes that government authorities should provide farmers with the enriched capabilities and competencies enabling them to adapt to CC.
    • Ismaïla Ouattara; Léréyaha Coulibaly; Koffi Abdelaziz Kouakou; Amidou Dao; Dabissi Djibril Noufé; Bamory Kamagaté; Issiaka Savané
    • 摘要: In the context of climate variability resulting in a decrease in rainfall with a severe drought, a spatio-temporal study of this phenomenon remains imperative for the efficient management of water resources. This paper aims to assess the long-term rainfall drought trend and breakpoints within the Comoe River watershed. From monthly rainfall data series (1960-2000), Standardized Precipitation Index (SPI) values were calculated for a time scale of 3 months (SPI.3). Statistical tests for breaks (CUSUM, and t-Student) and trends (Man-Kendall and Linear Regression) as well as the Sen’ slope method for estimating the magnitude of trends was applied. The breaks dates observed are mostly located after the 1970s. Based on SPI.3 values below the threshold of 0.84 chosen as an indicator of drought, rarely has more than half of the catchment area been affected by drought. The average watershed affected is about 20% over the study period (1960-2000). The most representative years, in terms of spatial expansion of the drought, in decreasing order of importance are: 1983, 1992, 1972 and 1982. The years 1982 and 1983 stand out for their exceptional condition, as the drought-affected 50% to 90% of the total catchment area. SPI.3 series from 1960 to the various break dates recorded slopes between -0.01 and 0.00 with a slight drought trend for most of the catchment. After the break periods, almost the entire northern part of the basin is characterized by slight moisture with Sen’s slopes between 0.000 and 0.005. The southern part will remain slightly subject to normal rainfall conditions.
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