Diversity of root-knot nematodes in Moroccan olive nurseries and orchards: does <Emphasis Type="Italic">Meloidogyne javanica</Emphasis> disperse according to invasion processes?     

Mohamed Aït Hamza  Nadine Ali  Johannes Tavoillot  Odile Fossati-Gaschignard  Hassan Boubaker  Abdelhamid El Mousadik  Thierry Mateille 《BMC ecology》2017,17(1):41

  相似文献   

Effects of carbohydrate source and polyethylene glycol on maturation and germination of somatic embryos in walnut (<Emphasis Type="Italic">Juglans regia</Emphasis> L.)     

Maryam Aflaki Jalali  Hassan Bahrami Sirmandi  Abdullah Hatamzadeh 《Journal of Crop Science and Biotechnology》2017,20(1):29-35

Low efficiency of somatic embryo maturation, germination, and conversion to plantlets is a major problem in many species including J. regia L. Germination efficiency of somatic embryos is very low in walnut. In this study, effects of two carbohydrate sources, sucrose and maltose (each at 3% and 6%), and two kinds of PEG (4000 and 6000) (each at four levels of 1.5%, 3%, 5% and 7.5%) on maturation and germination of walnut embryos were tested. The number of somatic embryos increased conspicuously on medium containing PEG. Furthermore, higher levels of PEG-4000 (7.5%) could remarkably enhance the morphogenesis of somatic embryos and the number of embryos produced. PEG-4000 stimulated somatic embryo maturation of walnut. This stimulatory effect was dependent on the carbohydrate source used. Sucrose in combination with PEG-4000 produced 50% of cotyledonary and normal somatic embryos. Different concentrations of PEG were effective on the number of embryos with a shoot meristem. PEG-4000 7.5% and sucrose 3.0% produced the highest rate (50.0%) of normal shooting embryos. However, PEG (4000, 6000) and maltose caused an unfavorable effect and increased the frequency of abnormal shaped somatic embryos.  相似文献   

Marketing mix for the promotion of biological control among small-scale paddy farmers     

Roghayeh Davari Farid  Jafar Azizi  Hassan Sadeghpour 《国际虫害防治杂志》2019,65(1):59-65

Understanding farmers’ decision process on the adoption of biological control (BC) may help in promoting adoption. This study explored for the first time the impact of marketing mix elements (product, price, promotion, and place) on bolstering BC for the management of rice stem borer (Chilo suppressalis Walker) among rice farmers in Fuman County in northern Iran. Farmers using BC were familiar with this method primarily via village councils and rural municipality organizations (Dehyaris) and then via distributors of trichocards. Almost half of the farmers (48.3%) had weak to moderate level of contact with distributors of trichocards. All four elements (4Ps) of marketing mix (product, place, price, and promotion) were effective on the marketing of BC agents. Place (distribution) mix, followed by price mix, were the most important factors in marketing trichocards in farmers’ views. According to the sensitivity to 4Ps of marketing mix, most farmers were grouped as semi-sensitive (45.6%) and sensitive (39.4%). Overall, the availability of biological agent products in the market, the affordable price of the products, and the strong relationship of rural people with village councils and rural municipality organizations (Dehyaris) are crucial factors for BC promotion in paddy fields of Fuman.  相似文献   

药隔期低温胁迫对小麦干物质积累、转运和分配及产量的影响     

柯媛媛  陈翔  张乐乐  张妍  许辉  MuhammadAhmadHassan  江港  林非非  魏凤珍  李金才 《安徽农业大学学报》2021,48(5):701-706

为探明药隔期低温胁迫对小麦产量的影响,以烟农19、新麦26为供试材料,在小麦药隔期进行不同程度(T1:2℃/4h、T2:0℃/4h、T3:-2℃/4h)的低温处理,研究药隔期低温胁迫对小麦干物质积累、转运和分配及产量的影响.结果 表明:药隔期低温胁迫显著降低小麦干物质积累量,不同抗倒春寒性小麦品种间干物质积累量存在差异,抗倒春寒性弱的小麦品种降幅更大.其中烟农19的T1、T2、T3处理分别降低33.4％、46.2％和54.7％,而新麦26则分别降低了50.1％、59.3％和72.4％.不同处理小麦籽粒、穗轴+颖壳、茎鞘+叶的干物质积累量均低于CK,且随着低温胁迫程度的加重呈明显降低趋势.小麦花前干物质的转运量、转运效率以及花前贮藏干物质对籽粒的贡献率均随着低温胁迫程度加重呈降低趋势.同时低温胁迫显著降低小麦籽粒和穗轴+颖壳的干物质分配比例,增加茎鞘+叶的分配比例.T1、T2和T3处理显著降低了小麦的穗粒数和千粒重及籽粒产量,烟农19的T1、T2和T3处理分别减产56.06％、86.36％和98.10％;新麦26的T1、T2和T3处理分别减产96.15％、98.07％和98.46％.药隔期低温胁迫显著降低小麦干物质的积累量、花前干物质的转运量、转运效率以及花前贮藏干物质对籽粒的贡献率和籽粒干物质分配比例,严重减少光合同化物向穗部的转运和分配,影响穗部小花的正常发育,从而导致穗粒数的减少,这是造成小麦减产的主要原因.  相似文献   

伊朗里海森林山坡上生长的欧洲鹅耳根系分布和抗张强度研究     

Ehsan Abdi Baris Majnounian Hassan Rahimi Mahmud Zobeiri 《林业研究》2009,20(2)

对生长在伊朗北部丘陵地带的8株欧洲鹅耳的根面积比率和根系拉伸强度进行了测定,评估了欧洲鹅耳根系生物力学特性。应用剖面挖掘法测得土层深度为0．1米的样品根面积比率。共用了123份根样品分析根系拉伸强度。结果表明,根面积比率随土层深度增加而减小,变化规律遵从幂函数;上坡面和下坡面根面积比率无统计差别。根系可达到的最大土层深度为0．75米,但是最大根面积比率存在于土层深度0．1米内。下坡面最小和最大根面积比率分别为0．004％和6．431％;而上坡面的根面积比率分别为0．004％和3．995％。上、下坡面根数无显著差异,而且90％以上的根系深入到50-60厘米的土层中。Spearman双变量相关性分析结果表明,根面积比率与根数无显著关系。平均根拉伸强度为31．51&#177;1．05MPa,且根系直径越粗根拉伸强度越小,遵从幂函数变化。图5表1参38。  相似文献   

镉胁迫对不同水稻基因型植株生长和抗氧化酶系统的影响   总被引：61，自引：6，他引：61  

邵国胜  章秀福  张国平 《中国水稻科学》2004,18(3):239-244

 以籽粒镉积累水平不同的两种品种（丙97252，低积累型；秀水63，高积累型）为材料，研究了镉胁迫对水稻植株生长和抗氧化酶系统的影响。采用水培试验，镉处理设0.0、0.1、1.0和5.0 μmol/L 4个水平。结果表明，镉胁迫抑制植株生长和叶绿素合成，改变植株丙二醛（MDA）含量和超氧物歧化酶（SOD）、过氧化氢酶（CAT）、过氧化物酶（POD）活性。在抗氧化酶活性上，根和地上部对镉胁迫的反应存在着差异。总体上，SOD、CAT和POD活性随镉水平的提高而减少，而MDA含量则表现相反。根和地上部MDA含量随着培养液中镉浓度提高而增加，且增加幅度秀水63明显大于丙97252。与对照相比，生长在5.0 μmol/L Cd处理下的植株， SOD活性在孕穗期下降46%~52%，在分蘖期仅下降13%~19%。高浓度镉胁迫下，两品种在MDA含量的增加幅度和叶绿素含量的降低幅度上表现不同，显示出它们对镉的耐性存在着差异。  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   

Obstbau in einer Oase     

Dr. Georg Ebert  Ibrahim Abdulhadi  Prof. Dr. Hassan Ali-Dinar 《Erwerbs-Obstbau》2005,47(2-3):61-66

  相似文献   

欧洲玉米螟雌蛾鳞片提取液对玉米螟赤眼蜂寄主搜索行为的影响   总被引：5，自引：0，他引：5  

王振营  周大荣  Sherif A. Hassan 《植物保护学报》1996,23(4):373-374

许多膜翅目寄生蜂在寄主栖息地和寄主定位过程中受化学刺激物的支配(Weseloh,1981;Noldus,1989),在寄主定向和接受行为方面,赤眼蜂利用多种来源于寄主的化学刺激物——利它素(Nordlund等,1976)。寄主鳞片及鳞片正己烷提取物可增强赤眼蜂寄主搜索反应和提高对寄主的寄生率(Lewis等,1972、1985;Shu等,1986;Noldus,1989;王锦举等,1990)。玉米螟赤眼蜂是亚洲玉米螟的优势卵寄生蜂(张荆等,1990),引进到德国后经室内研究表明,其对欧洲玉米螟卵的偏嗜性很强,箱笼及温室条件下对欧洲玉米螟卵  相似文献   

Growth and Apparent Absorption of Minerals in Broiler Chicks Fed Diets with Low or High Tannin Contents   总被引：5，自引：1，他引：4  

Hassan IA  Elzubeir EA  El Tinay AH 《Tropical animal health and production》2003,35(2):189-196

Sorghum grains with low (0.28 per cent catechin equivalent (%CE) or high (1.36 %CE)) tannin contents were used to study the effect of tannin on growth and on the apparent absorption of Ca, P, Mg, Na, K, Fe and Co by chickens. High-tannin sorghum caused a highly significant (p0.01) reduction in the weight gain and feed intake of broiler chicks compared to low-tannin sorghum and increased the feed conversion ratio (p0.01). The amount of tannin did not affect mortality. The apparent absorption of Ca, P, Mg, Na, K, Fe and Co was reduced (p0.01) by feeding sorghum grains with a high tannin content.  相似文献