Effects of environmental factors and food availability in Northern Aegean sea on the cultivation of Mediterranean Mussels (Mytilus galloprovincialis)

This study used two different collectors made of polypropylene (PP) rope and polyethylene (PE) fishing net to determine Mediterranean mussel's settlement, growth, condition index (CI), meat yield (MY) and shell thickness index (STI) during the period spent between June 2017 and November 2018. With this regard, chlorophyll a, water temperature, salinity, pH and particulate matter were defined through water samples that were collected on monthly basis triplicate. The mean chlorophyll a level was recorded as 0.32 ± 0.31 μg/L, while water temperature was 19.73 ± 5.14°C, salinity was 35 ± 2.070‰, pH was 8.12 ± 0.04, and TPM was 14.91 ± 10.48 mg/L. As a result of the cultivation period of 8 months spent following the first intense grip, the length of the mussels is measured as 31.79 ± 6.20 mm. Based on the Pearson correlation analysis results, the most important environmental parameter affecting Mediterranean mussels growth in length on PP rope collectors is the temperature (p < .05). The STI and CI were determined to be related with environmental temperature parameters, while no determinations could be obtained concerning the correlation of MY with environmental parameters. Assessment of Mediterranean mussels’ growth rate in PP rope collectors proved significant differences (p < .05) between March and November 2018. As no Mediterranean mussels are observed on PE fishing nets during the samplings performed throughout the study period, it is determined that PE fishing nets are not suitable collector types for Mediterranean mussel cultivation.     

Unravelling the diversity and assemblage of phytoplankton in homestead ponds of central coastal belt,Bangladesh

Homestead ponds may offer an ideal opportunity in contribution to household income, fish consumption through fish culture. Phytoplankton plays a key indicator in pond productivity. However, the phytoplankton communities in the homestead ponds are nearly undetermined in Bangladesh. This study summarizes the phytoplankton diversity, assemblage and ecological parameters of the homestead ponds in central coastal belt, Bangladesh, based on two seasons. The results revealed that significant differences (p < .05) were found in pH, DO, conductivity, TDS, nitrates, phosphates and sulphates except temperature in monsoon, and transparency in both seasons. A total of 34 phytoplankton genera representatives of five major groups were recorded such as Euglenophyceae (41.5%), Chlorophyceae (30.5%), Cyanophyceae (13%), Dinophyceae (10%) and Bacillariophyceae (5%). A significant difference (p < .05) in phytoplankton abundance was found in both seasons with the highest mean of 186.13 ± 129.34 × 10⁴ cells L^?1 in monsoon and the lowest mean of 144.40 ± 107.26 × 10⁴ cells L^?1 during winter. The diversity (H'), evenness (J'), richness (d) and dominance (D) ranged from 1.62 to 2.47, 0.52 to 0.97, 0.37 to 1.15 and 0.10 to 0.28 respectively. Based on SIMPER, the most dominant (>10%) genera for dissimilation within stations and seasons were Euglena spp., Phacus spp., Chlorella spp., Strombomonas spp. and Peridinium spp. ANOSIM results stated that 12 genera of phytoplankton were significant contributors based on average dissimilarity. Pearson's correlation coefficient and canonical correspondence analysis (CCA) revealed that phytoplankton abundance, diversity and community were mainly governed by transparency, dissolved oxygen and nitrates.     

一个水稻新型叶色突变体的形态结构与遗传定位

 所用水稻叶色突变体为自然突变,并命名为白淮稻7号,其叶色表型为绿 白 绿,且突变表型只有在移栽等因素引起的机械损伤信号胁迫下才会产生。研究结果表明,叶色转白前,突变体生长态势、叶色、叶绿素a含量和叶绿体超显微结构与野生型差异不大;叶色转白后,突变体总叶绿素、叶绿素a、叶绿素b和类胡萝卜素含量都显著低于野生型和叶色转白前,而叶绿体中的类囊体逐渐降解,基粒片层减少、基粒数量明显减少,且在成熟后突变体叶色黄化、植株变矮小。遗传分析表明,突变性状由1对隐性核基因控制。以该突变体与江西1587的F2群体为定位群体,将突变基因定位于水稻第11染色体分子标记L59.2 7和L64.8 11之间大约740.5 kb的区间内。认为该突变基因是一个新的水稻叶色突变基因,暂命名为GWGL。     

三线闭壳龟、黄喉拟水龟、黄缘盒龟及其地方品系外部形态特征比较研究

本文首次对中国珍稀龟类三线闭壳龟（Cuora Trifasciata）、黄喉拟水龟(Mauremys mutica)、黄缘盒龟(Cistoclemmys flavomarginatas)及其地方品系的外部形态特征和差异进行了比较研究,为制定相应的龟类种质标准,保护和合理利用龟类资源提供技术资料。     

番茄潜叶蛾与马铃薯块茎蛾形态特征及为害症状的比较

番茄潜叶蛾Phthorimaea absoluta Meyrick是一种重要的世界性检疫性害虫。2017年8月入侵我国,现已扩散蔓延至我国多个省市,对露地和保护地鲜食番茄生产构成了严重威胁。在田间种植的番茄和马铃薯上,番茄潜叶蛾与同科的马铃薯块茎蛾常混合发生,且形态与取食为害特征相似,较容易混淆,给田间识别带来困难。本文详细描述和比较了番茄潜叶蛾和马铃薯块茎蛾成虫、卵、幼虫和蛹的外部形态及幼虫为害症状。本文将为番茄潜叶蛾和马铃薯块茎蛾的准确识别及田间调查提供指导,还可为这两种害虫的精准测报奠定基础。     

Productivity and nutrient uptake of newly released wheat varieties at different sowing times under poplar plantation in north-western India

Standardisation of cultural practises is one of the primary objectives to make the system ecologically sustainable and economically viable. In this context, the present study was conducted to optimise the time of sowing in relation to newly released wheat varieties under 4–6 year old poplar block plantation. Six widely grown wheat varieties (PBW 502, PBW 343, WH 542, PDW 274, PBW 509 and PBW 373) were intercultivated during three consecutive crop growth seasons at three times of sowing (mid November, late November and mid December) under block plantation of poplar (Populus deltoides Bartr.) clone G-48. The grain yield and nutrient uptake of wheat varieties was higher in open conditions than under the trees. The wheat variety PBW 502 out yielded the rest of wheat varieties over different sowing times. The highest grain yield was recorded when crop was sown during mid November over the 3 years. Thus adoption of PBW 502 under poplar plantation would substantially improve the overall productivity of the system without any additional input cost. All the varieties performed better when sown early compared to one-month delay. The various growth parameters like tiller height and number, spike length and 100 grain weight contributed significantly towards higher grain yield in early sown conditions (mid November) under poplar irrespective of its age of plantation. The nutrient uptake (N, P and K) by wheat straw and grain was higher in early sown crop with longer growth span than the late sown crop. The higher quantity of N, P and K was removed from soil by PBW 509, PBW 373 and PBW 343, respectively.     

不同植物的咸水滴灌量试验研究——以新疆尉犁县为例

2008年在新疆尉犁县的苗圃地,通过测定不同咸水滴灌量(3000,4 500,6 000 m3·hm-2·a-1)下5种植物的主要形态指标的生长量,包括株高、地径、冠幅和根冠比,确定了各植物合适的咸水滴灌量.结果表明:在试验设计的3个咸水滴灌量中,多枝柽柳和银新杨的合适咸水滴灌量为6000m3·hm-2·a-1,9月份时该咸水滴灌量下多枝柽柳的株高生长量为26.2 cm,冠幅生长量为9 925.7 cm2;银新杨的株高生长量为8.3 cm,地径生长量为0.242 cm,冠幅生长量为605.0 cm2;中天杨和四翅滨藜的合适咸水滴灌量为4 500 m3·hm-2·a-1,9月份时该咸水滴灌量下中天杨的株高生长量为23.5 cm,地径生长量为0.269 cm,冠幅生长量为4 560.0 cm2;四翅滨藜的株高生长量为50.8 cm,冠幅生长量为24 900.0 cm2.不同咸水滴灌量下,土壤表层0～5 cm的含水量最低,而含盐量最高;当土壤深度超过10 cm时,土壤的水盐变化已经不明显.     

OP-367等3个北美杨品种在新疆伊犁的引种试验

通过对引进的OP-367、DN-34、NM-6等3个北美杨品种与当地优良品种进行育苗、造林试验,结果表明：苗期DN-34杨封顶较早,高生长与其他品种有一定差异,造林成活率最高,为94.7%;扦插造林3 a来,OP-367杨生长量最大,胸径6.93 cm,树高8.8 m;造林5 a来,3个品种未发生冻害、风折等现象。     

热研8-79旺产期开割树产胶生理特性研究初报

以我国中规模推广级早熟高产品种热研8-79旺产期开割树为材料,测定了产量、干含、蔗糖、无机磷、硫醇和镁离子等指标变化,以期研究该品种的生理特性和对s/2d/3+ET1%刺激割胶制度的适应性。结果表明,无刺激条件下,相对于生理基本平衡的RRIM600品种,热研8-79具有高糖、高硫醇和高产的特性;刺激后产量增加不明显,胶乳的稳定性增强,但糖和干胶含量有所下降,显示出部分疲劳生理效应。根据该品种产量很高、较易死皮的特点,生产中刺激割胶应遵循低浓度低频率原则,同时必须加强施肥,提高管理水平。     

不同铜、锰水平对荷斯坦种公牛血清抗氧化指标的影响

【研究目的】本试验旨在研究不同铜、锰水平对荷斯坦种公牛血清抗氧化指标的影响。【方法】试验选取40头荷斯坦种公牛,随机分为10组,对照组饲喂基础日粮,试验组采用3×3试验设计,分别饲喂不同铜、锰水平的日粮,铜的添加水平分别为4、8、12mg/kg（按日粮干物质计）,锰的添加水平分别为50,125,200mg/kg,试验期8个月。【结果】结果表明：不同铜、锰水平对荷斯坦种公牛血清中谷胱甘肽过氧化物酶（GSH-PX）、超氧化物歧化酶（SOD）、锰超氧化物歧化酶（Mn-SOD）活性及血清一氧化氮（NO）含量差异极显著（P<0.01）,对总抗氧化能力（T-AOC）、铜锌超氧化物歧化酶（CuZn-SOD）差异显著（P<0.05）,对血清过氧化氢酶（CAT）,铜兰蛋白（CP）活性及丙二醛（MDA）含量无显著差异(P>0.05)。【结论】综合分析不同铜、锰水平下试验牛抗氧化指标的变化,铜的适宜添加水平为4-8mg/kg日粮干物质,锰的适宜添加水平为50mg/kg日粮干物质。