Compatibility of root growth and tuber production of potato cultivars with dynamic and static water‐saving irrigation managements          下载免费PDF全文

S. H. Ahmadi  M. Agharezaee  A. A. Kamgar‐Haghighi  A. R. Sepaskhah 《Soil Use and Management》2017,33(1):106-119

The important root characteristics of root length density (RLD) and root mass density (RMD) generally differ among irrigation managements and potato cultivars. The objective of this study was to investigate the RLD and RMD variations and their functional relationships with gross potato tuber yield for two commercial potato cultivars, Agria and Sante, under different irrigation strategies. Full irrigation and water‐saving irrigation strategies, deficit and partial root drying irrigations, were applied statically (S) and dynamically (D) based on daily crop evapotranspiration. Results showed that SPRD had significantly greater RLD (3.64 cm/cm³) and RMD (132.7 μg/cm³) than other irrigation treatments. Between the potato cultivars, Agria had significantly larger values of RLD (3.50 cm/cm³) and RMD (138.7 μg/cm³) than Sante. The functional relationship between the root growth characteristics and tuber yield showed that under water‐saving irrigations, Agria increased root mass at the expense of gross tuber yield but Sante increased root mass to maintain larger gross tuber yields. However, Agria produced more roots and gross tuber yield than Sante, and it is concluded that Agria is a more drought‐tolerant potato cultivar, which is recommended for tuber production in regions where water might be scarce. It was shown that larger root production in potatoes was associated with improved tolerance to water stress.  相似文献   

In vitro metabolism of EPN and EPNO in susceptible and resistant strains of house flies     

Amin A. Nomeir  Nicolas P. Hajjar  Ernest Hodgson  Walter C. Dauterman 《Pesticide biochemistry and physiology》1980,13(2):112-120

EPN is twice as toxic as EPNO to house flies from both the Diazinon-resistant strain and the susceptible strain. EPN and EPNO are also eight times more toxic to the susceptible than the resistant strain. This is due to the ability of the resistant strain to metabolize these compounds to a greater extent. Metabolism by the glutathione S-transferases present in the 100,000g supernatant is more extensive than that by the NADPH-dependent microsomal mixed-function oxidases. The glutathione S-transferases are the major route of metabolism for EPN and appear to be the principal mechanism conferring resistance. EPN was metabolized by the microsomal fraction via oxidative desulfuration to the oxygen analog, EPNO, and by oxidative dearylation to p-nitrophenol. EPNO was metabolized by the same system to p-nitrophenol and desethyl EPNO as well as to an unknown metabolite. The soluble fraction metabolized EPN to p-nitrophenol, S-(p-nitrophenyl)glutathione, O-ethyl phenylphosphonothioic acid, and S-(O-ethyl phenylphosphonothionyl)glutathione. The identification of the latter conjugate demonstrates a new type of metabolite of organophosphorus compounds. EPNO was metabolized by the soluble fraction to p-nitrophenol and S-(p-nitrophenyl)glutathione.  相似文献   

Cestodes of ruminants in Afghanistan.     

J Prokopic  K Blazek  F Moravec  A Amin 《Folia parasitologica》1976,23(2):127-129

Five cestode species parasitizing ruminants were found for the first time in Afghanistan: Moniezia benedeni, M. expansa, Avitellina centripunctata, Stilesia globipunctata, and Thysaniezia giardi.  相似文献   

Breakdown of resistance in cotton to cotton leaf curl disease in Pakistan   总被引：5，自引：0，他引：5  

S. Mansoor  I. Amin  S. Iram  M. Hussain  Y. Zafar  K. A. Malik  R. W. Briddon 《Plant pathology》2003,52(6):784-784

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Host status effect of cowpea and sunflower on the populations ofMeloidogyne javanica andRotylenchulus reniformis     

W. A. Amin  M. M. A. Youssef 《Anzeiger für Sch?dlingskunde》1997,70(4):75-76

A highly susceptible cowpea,Vigna sinensis cv. Baladi plants were tested as trap plants for eitherMeloidogyne javanica orRotylenchulus reniformis under greenhouse conditions. The plants were gathered by cutting them above the surface of the soil or by uprooting them, 1/2, 1, 3, 6, 12, 24, 36 and 48 days after nematode inoculation. Both of the mentioned nematodes began to mature and lay eggs after the 12th day from their inoculation. Hence, it is advised to pull up cowpea plants from 3–12 days after nematode inoculation. After planting sunflower,Helianthus annus cv. Miak replacing cowpea, the nematode populations were higher, in most cases, on sunflower plants replacing cutting cowpea than those on sunflower replacing uprooted cowpea. The highest percentages of nematode reduction were 98.55 and 99.57 forM. javanica and 95.09 and 92.90% forR. reniformis on sunflower plants replacing cutting and uprooted cowpea plants after 12 days from nematode inoculation, respectively.M. javanica andR. reniformis decreased the length and weight of sunflower plants as affected by planting time and method of cowpea harvest. This method of nematode control is cheaper, easy and pollution free.  相似文献   

Treatment of canine haemangiosarcoma with suberoylanilide hydroxamic acid, a histone deacetylase inhibitor     

L. A. Cohen  B. Powers  S. Amin  D. Desai 《Veterinary and comparative oncology》2004,2(4):243-248

A case report is presented by describing the treatment of a 12‐year‐old dog – diagnosed with haemangiosarcoma (HSA) – with suberoylanilide hydroxamic acid (SAHA), a histone deacetylase (HDAC) inhibitor. The drug was administered orally, on a daily basis, approximately 2 weeks post‐splenectomy at a dose of 3 mg kg^?1. HSA is a lethal malignancy of the endothelium, which is usually disseminated by the time it is diagnosed. Median survival time, usually, is no longer than 80 days. Following treatment with SAHA, no sign of malignant growth could be discerned by means of diagnostic abdominal ultrasound, chest X‐ray or with the help of clinical symptoms, over a period of >1000 days. The precise mechanism by which HDAC inhibitors exert their anti‐cancer effects is uncertain, but evidence suggests that exposure to SAHA generates hyperacetylated chromosomal histones, which, in turn, facilitates the expression of tumour suppressor genes turned off by epigenetic mechanisms during neoplastic transformation of the endothelium.  相似文献   

ELISA法测定番茄茎叶中的褪黑素含量     

胡永静  潘光军  龙慧  皮毅  张才鲜  明方艳  谷佳  陈阿敏  须文 《蔬菜》2019,(2):20-24

为了研究植物内源褪黑素与植物抗性的关系,以4叶1心的番茄幼苗为试验材料,采用酶联免疫吸附测定(ELISA)法测定正常番茄、鱼腥草提取液和灰霉菌侵染后的番茄茎叶中的褪黑素含量。结果表明:番茄叶片和茎的褪黑素含量分别为14.53、2.80 ng/g,二者之间差异极显著,叶片的褪黑素含量是茎的5.19倍;经鱼腥草提取液预处理和灰霉菌侵染后,番茄叶片的褪黑素含量显著增加,鱼腥草提取液预处理有助于减轻番茄叶片上的灰霉病发病症状,但并不依赖于叶片内源褪黑素含量的增加。可以检出的番茄茎叶中的褪黑素含量高于2.60 ng/g,就灵敏度而言,ELISA法完全可以用来检测番茄的组织器官的褪黑素含量。  相似文献   

Dietary simultaneous replacement of fish meal and fish oil with blends of plant proteins and vegetable oils in yellowfin seabream (Acanthopagrus latus) fry: Growth,digestive enzymes,antioxidant status and skin mucosal immunity     

Adnan Abbasi  Amin Oujifard  Mansour Torfi Mozanzadeh  Hassan Habibi  Mahmoud Nafisi Bahabadi 《Aquaculture Nutrition》2020,26(4):1131-1142

A 56‐day nutritional research was performed to examine the influence of alternative vegetal protein and lipid sources on performance of yellowfin seabream fry (Acanthopagrus latus) (0.5 ± 0.0 g). In this regard, five isoproteic (Ca. 500 g/kg) and isolipidic (Ca. 150 g/kg) diets were formulated in which fish meal (FM) and fish oil (FO) were simultaneously replaced with blends of plant proteins (PP, soybean meal and corn gluten) and vegetal oils (VO, canola and soybean oils) at 20% (SR20), 40% (SR40), 60% (SR40) and 80% (SR80) levels, respectively; meanwhile, a control diet (SR0) was formulated based on FM and FO. Growth and feed utilization were not influenced by experimental diets. The fatty acid profile of fillet drastically altered by dietary treatments. Fish fed with the SR60 and SR80 feeds had higher total protease, trypsin and α‐amylase activities than other treatments. The antioxidant enzyme activities and glutathione content in liver were enhanced in fish fed with the SR40, SR60 and SR80 diets. Skin mucosal immune parameters including total protein content, alkaline phosphatase and alternative complement pathway activities in the control group were relatively lower than the vegetal treatments. According to these results, it is recommended that 410 g/kg of FM and 45 g of FO/kg can be replaced with alternative vegetal sources in diet for A. latus fry.  相似文献   

分子标记在植物上的应用   总被引：4，自引：0，他引：4  

乔爱民  刘佩瑛 《长江蔬菜》1999,(4):1-4

综述分子标记技术ＲＦＬＰ、ＲＡＰＤ、ＡＦＬＰ的基本原理、优缺点及其在植物研究中的应用情况。  相似文献   

Adaption of a formula for simulating bedload transport in the Nile River,Egypt     

Abdelhaleem  Fahmy Salah  Amin  Ahmed Mostafa  Basiouny  Mohamed Elsayed  Ibraheem  Heba Fathy 《Journal of Soils and Sediments》2020,20(3):1742-1753

Journal of Soils and Sediments - Bedload transport discharge is important in river engineering and morphodynamics. The Meyer-Peter and Müller (MPM) equation for determining bedload transport...  相似文献