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41.
Yuling Han Wei Ma Baoyuan Zhou Akram Salah Mingjian Geng Cougui Cao Ming Zhan Ming Zhao 《作物学报(英文版)》2021,(1):168-180
Straw return is an effective way to improve crop grain yield and potassium(K)use efficiency by increasing soil K content.However,the effects of straw return on soil K supplying capacity,replacement of K fertilizer,and K-use efficiency under maize(Zea mays L.)–rice(Oryza sativa L.)cropping systems are little studied.A two-year field experiment was conducted to determine the physiological determinants of K-use efficiency under straw return with four K fertilization rates.Sr33(straw returned plus 33%of K fertilizer applied)and Sr67(straw returned plus 67%of K fertilizer applied)increased annual crop yields by 1.5%and 3.2%and increased agronomic K-use efficiency by respectively 2.9 and 1.3-fold on average in the two years,compared with the conventional practice S0K100(no straw returned plus normal amounts of K fertilizer applied).The Sr33 and Sr67 treatments resulted in significantly greater equilibrium K concentration ratios(CR0 K)and specifically exchangeable K(KX)values according to quantity/intensity(Q/I)relationship analyses,indicating improvement of the potential soil K supply capacity.However,the Sr67 better maintained the soil exchangeable K level and K balance.The results suggested that K released from maize and rice straw can replace about half of chemical K fertilizer,depending on the available K content in maize–rice cropping system production. 相似文献
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Javed A Jamil A Rezaei-Zarchi S Kalantar SM Anvari M Nazem H 《Iranian Biomedical Journal》2008,12(2):85-92
Objectives: It was aimed to investigate the effects of different doses of follicle stimulating hormone (FSH) and activin A on the growth and maturation of preantral mouse follicles during the in vitro culture. Methods: Preantral follicles (90-100 mum in diameter) were harvested from 6-8 week-old Syrian mice and cultured in TCM199 culture medium for 6 days to see the effect of FSH and Activin A. Activin A concentrations in the range of 10-200 ng/ml were used, while 10, 50, 100, 150 and 200 mIU/ml FSH were used in the experiment. Results: Activin A concentration of 100 ng/ml resulted in a significant increase in follicle diameter (170 mum) with the survival rate of 73% as compared to the control (100 mum and 25%, P<0.05). The number of oocytes matured and the percentage of germinal vesicle breakdown (GVBD) was 61 and 70%, respectively as compared to the control (20 and 29%, P<0.05). Follicle diameter (190 mum) and survival rate (85%) increased significantly in the presence of 100 mIU/ml of FSH as compared to the control (P<0.05). But, the administration of activin A+FSH increased the effect of both factors on follicular diameter (205 mum as compared to 100 mum in control, P<0.01). Follicle survival, oocyte maturation and GVBD rates were 91, 81 and 89%, respectively (P<0.01). Conclusion: These results have suggested that exposure to FSH and activin A before the formation of antral cavity had positive effect on follicle survival and oocyte robustness. 相似文献
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Saba Anwar Hafiz Muhammad Akram Mubashir Niaz Rizwan Rasheed 《Communications in Soil Science and Plant Analysis》2016,47(19):2225-2232
Drought severely affects yield and its quality in different plants. In a field experiment, maize was exposed to drought stress at vegetative, silking, and kernel-filling growth stages to determine the drought-induced changes in kernel yield and quality traits. The experiment was laid-out in a randomized complete block design with four replications. Withholding water at the vegetative stage was very effective in increasing protein, total amino acids, total soluble sugars, glucose, and sucrose contents in maize kernels. In contrast, drought applied at the kernel-filling stage increased the total free amino acids, total phenolics, and activities of catalase (CAT) and ascorbate peroxidase (APX) in maize kernels. Drought at the vegetative stage improved the kernel quality while at the silking stage severely affected kernel yield in maize. Taken together, the results suggested that incidence of drought should be avoided at the silking stage to minimize kernel yield losses and decrease in kernel quality in maize. 相似文献
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Awais Rasheed Tania Safdar Alvina Gul-Kazi Tariq Mahmood Zahid Akram Abdul Mujeeb-Kazi 《Breeding Science》2012,62(4):365-370
High molecular weight glutenin subunit composition and variation in 95 Elite-1 synthetic hexaploid (SH) wheats (Triticum turgidum/Aegilops tauschii; 2n = 6× = 42; AABBDD) were determined by sodium dodecyl sulphate polyacrylamide gel electrophoresis method (SDS-PAGE). Twenty two different alleles at Glu-1 loci in SHs were observed. Forty four different patterns of HMW-GS in synthetics were found. This higher HMW glutenin composition was due to higher proportion of D-genome encoded subunits in these SHs. 8% urea/SDS-PAGE better discriminated subunit 2* than 12% gels. However 12% urea/SDS-PAGE allowed differentiated mobility of Glu-Dt1 subunits. Genetic variability at Glu-Dt1 locus was greater than Glu-A1 and Glu-B1 loci. The relative high frequency of superior alleles, Glu-B1b and Glu-Dt1d indicated the superior bread making quality attributes embedded in these synthetic hexaploid wheats. Of the 95 Elite-1 SHs 27.1% possessed superior alleles at Glu-A1 and 51% had superior alleles at Glu-B1 locus. At Glu-Dt1 frequency of inferior allele 1Dx2 + 1Dy12 was very low (5.26%) and nine different rare alleles along with the higher frequency (22.1%) of D-genome encoded subunit, 1Dx5 + 1Dy10, were observed. These superior alleles shall form the priority selective sieve for their usage in wheat improvement efforts. 相似文献
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Munir Ahmad Mohamed H. El-Saeid Muhammad Abrar Akram H. R. Ahmad Haseeb Haroon Abid Hussain 《Journal of plant nutrition》2016,39(9):1283-1291
In this study, impact of silicon (Si) application on wheat performance under drought stress is studied. Experimental soil was sandy clay loam with an average pH of 8.01, electrical conductivity (EC) of 2.36 dSm?1, and calcium carbonate (CaCO3) content of 2.16%. Soil was severely deficient in organic matter (<1%). Average extractable phosphorus (P) and potassium (K) concentration was 230 and 5.21 mg kg?1, respectively. Silicon potassium metasilicate (K2SiO3) was applied at the rate of 0 and 12 kg/ha with three canal water irrigation frequencies including two, three, and four under randomized complete block design (RCBD) factorial fashion with three replications. Results indicated that drought stress significantly reduced plant height, spike length, shoot fresh weight, and number of spikelets/spike, eventually enhancing wheat yield. Concentration of K+ in shoot (28.65 mg g?1) and grains (3.51 mg g?1) increased with Si application, which helped to maintain water potential in plant even under reduced moisture level in plants and soil, ultimately producing more yield and biomass under drought stress conditions. 相似文献
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Sajad Fakhri Akram Yarmohammadi Mostafa Yarmohammadi Mohammad Hosein Farzaei Javier Echeverria 《Marine drugs》2021,19(3)
In recent decades, several neuroprotective agents have been provided in combating neuronal dysfunctions; however, no effective treatment has been found towards the complete eradication of neurodegenerative diseases. From the pathophysiological point of view, growing studies are indicating a bidirectional relationship between gut and brain termed gut-brain axis in the context of health/disease. Revealing the gut-brain axis has survived new hopes in the prevention, management, and treatment of neurodegenerative diseases. Accordingly, introducing novel alternative therapies in regulating the gut-brain axis seems to be an emerging concept to pave the road in fighting neurodegenerative diseases. Growing studies have developed marine-derived natural products as hopeful candidates in a simultaneous targeting of gut-brain dysregulated mediators towards neuroprotection. Of marine natural products, carotenoids (e.g., fucoxanthin, and astaxanthin), phytosterols (e.g., fucosterol), polysaccharides (e.g., fucoidan, chitosan, alginate, and laminarin), macrolactins (e.g., macrolactin A), diterpenes (e.g., lobocrasol, excavatolide B, and crassumol E) and sesquiterpenes (e.g., zonarol) have shown to be promising candidates in modulating gut-brain axis. The aforementioned marine natural products are potential regulators of inflammatory, apoptotic, and oxidative stress mediators towards a bidirectional regulation of the gut-brain axis. The present study aims at describing the gut-brain axis, the importance of gut microbiota in neurological diseases, as well as the modulatory role of marine natural products towards neuroprotection. 相似文献
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Palsaniya D. R. Kumar Sunil Das M. M. Kumar T. Kiran Kumar Sunil Chaudhary Manoj Chand Khem Rai S. K. Ahmed Akram Sahay C. S. Choudhary Mukesh 《Agroforestry Systems》2021,95(8):1619-1634
Agroforestry Systems - Integrated farming system (IFS) has been the way of life of agrarian people in semi-arid tropics (SAT) of India and other developing countries. However, there has been losing... 相似文献
48.
为探讨松萝酸对肉仔鸡免疫器官生长发育的影响,试验选用225只1日龄AA肉仔鸡,随机分成5组,每组3个重复,每个重复15只.阴性对照组饲喂基础日粮,抗生素组添加0.3 g/kg那西肽和0.25 g/kg硫酸黏杆菌素预混剂,试验组分别添加0.003％、0.004％和0.005％松萝酸.结果表明,日粮中添加0.003％松萝酸对肉仔鸡1～42日龄体重及平均日增重具有一定的提高作用,但与其他组差异不显著(P＞0.05);添加0.004％松萝酸对肉仔鸡胸腺、法氏囊和脾脏的质量及指数均无显著影响(P＞().05),各添加组也均未观察到异常变化.从总体结果来看,日粮中添加0.004％松萝酸对肉仔鸡免疫器官的作用优于抗生素组. 相似文献
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Ameer Muhammad Wajahat Jabeen Farhat Asad Muhammad Kaukab Ghazala Bashir Amnah Rasheed Misha Younis Hafsa Munir Naveed Nawaz Javaria Zainab Rida Akram Muhammad 《Fish physiology and biochemistry》2021,47(5):1559-1564
Fish Physiology and Biochemistry - The applications of exogenous hormones in different species for the induction of oocyte production, final oocyte maturation (FOM), and spawning for their... 相似文献