Population structure of three woody species in four ethnic domains of the sub‐sahel of Burkina Faso

In developing countries many people depend on woody resources for their livelihoods. Monitoring human impact on the populations of socio‐economically important species is therefore important for the conservation of vulnerable plants. In order to assess and compare the population structure and regeneration patterns of three multipurpose species, namely Acacia seyal Del., Balanites aegyptiaca Delile and Pterocarpus lucens Lepr. in four ethnic areas of the sub‐Sahel of Burkina Faso (Samo, Gourmantché, Fulani and Mossi), we used the size‐class distribution method (SCD) (Condit et al., 1998 ). Diameter at breast height (Dbh) of adult individuals of each species were sampled on 1000 m² (20 m × 50 m) plots in each ethnic domain. Recorded Dbhs were distributed among eight size‐classes of 5 cm intervals. For each species, the slope of the regression of the SCD was considered to be an indicator of the population structure. Seedlings and saplings were recorded on five nested 25 m² plots and fell into five height classes of 0·5 m intervals. The target species had significant (p < 0·001) negative SCD slopes with an inverse J‐shape distribution in all ethnic areas; indicating stable populations with good regeneration. Kruskal–Wallis test for the SCDs of A. seyal, B. aegyptiaca and P. lucens did not differ significantly among the ethnic areas (p > 0·1). This suggests that the dynamics of each of the three species is similar across ethnic domains and the sub‐Sahel. Data from P. lucens depicted an apparent stable population structure which contrasted with our field observations, perception of local people and previous studies. Copyright © 2010 John Wiley & Sons, Ltd.     

苦瓜新品种闽研3 号的选育

闽研3 号是以k-48 为母本,以k-43 为父本选育而成的苦瓜一代杂种。坐果能力强,瓜呈长纺锤状,瓜皮绿色有光泽,瓜长28～37 cm,横径6～7 cm,肉厚0.8～1.1 cm,平均单瓜质量500 g。肉质甘脆微苦,品质好。每667 m² 产量2 500～3 000 kg,适合福建省及周边地区种植。     

辣椒新品种豫07-01 的选育

豫07-01 是以自交系P70-4 为母本,以P20-8 为父本配制而成的辣椒一代杂种。果实牛角形,
纵径15.3 cm,横径3.6 cm,平均单果质量66.6 g,果皮绿色,平均每667m² 产量3 456.51 kg,VC 含量
814.0 mg·kg^-1,可溶性糖2.57%。高抗病毒病、疫病和炭疽病,适宜春露地和保护地早熟栽培。     

中晚熟大白菜新品种珍绿80 的选育

珍绿80 是以自交不亲和系J271 和J401 配制而成的中晚熟直筒型大白菜一代杂种,生育期
85 d（天）左右,株型直立,株高60 cm,开展度68 cm,外叶深绿色,叶面有茸毛,微皱,白绿帮;叶
球顶部舒心,叶球长筒形,心叶浅黄色,球高54 cm,球径14.5 cm, 球形指数3.7,单球质量3.5～4.0 kg。
商品性好,品质优,丰产性强。高抗霜霉病和病毒病。平均每667 m² 产量7 000 kg 左右,适宜北方地区
作为中晚熟秋大白菜种植。     

厚皮甜瓜新品种甬甜7 号的选育

甬甜7 号是以高代自交系YW06-1 为母本,以YW10-3 为父本杂交选育而成的脆肉型厚皮
甜瓜一代杂种。果实椭圆形,平均单果质量约1.8 kg;果皮米白色,布细密网纹;果肉浅橙色,中心折光
糖度一般在15% 以上,口感松脆、细腻;春季果实发育期40 d（天）左右,全生育期100～110 d（天）;
夏秋季果实发育期38 d（天）左右,全生育期80 d（天）左右。田间调查表明较抗蔓枯病,一般产量
1 080～2 400 kg ·（667 m ²）^-1,适宜华东地区春季和秋季设施栽培。     

日光温室黄瓜新品种济优13 号的选育

济优13 号是以优良自交系04031 作母本,以05003 作父本配制而成的黄瓜一代杂种。植株生长势强,叶片中等大小;瓜条顺直,瓜长32 cm 左右,单瓜质量220 g 左右,瓜深绿色,有光泽,密生白刺,品质优异;主蔓第1 雌花节位始于第5～6 节,雌花节率45％左右;抗霜霉病、白粉病,中抗枯萎病;日光温室越冬栽培前期产量2 800 kg·（667 m²）^-1 左右,总产量12 000 kg·（667 m²）^-1 左右,适宜日光温室越冬茬栽培。     

速生大白菜新品种30 快菜的选育

30 快菜是以大白菜DH 系P35 和自交不亲和系175 为亲本配制而成的半结球食用型速生大白菜一代杂种。生长期30 d（天）左右,生长速度快,包心早,株型直立,叶片绿色、无茸毛、叶缘全缘,质地柔软,田间调查结果表明高抗病毒病。株高25 cm,叶片数达到10 片时即可采收。从播种到采收25～45 d（天）,一般产量3 000 kg·（667 m ²）^-1 左右,适合全国各地种植。     

Seed Priming Improves Agronomic Trait Performance under Flooding and Non-flooding Conditions in Rice with QTL SUB1

Farmers in South East Asia are adopting rice crop establishment methods from transplanting to direct wet or dry seeding as it requires less labour and time and comparatively less energy than transplanting.In contrast to irrigated condition,in rainfed lowland,direct seeding is a common practice.Early flooding controls weeds but decreases seedling establishment in direct seeded rice.Anaerobic germination is an important trait to counteract damages caused by early flooding.Management options which can help in crop establishment and improve crop growth under flooding might remove the constraints related to direct seeding.The investigation was carried out with two near isogenic lines Swarna and SwarnaSub1.Swarna-Sub1 is tolerant to submergence whereas Swarna is susceptible.Seed priming was done with water and 2% Jamun(Syzygium cumini) leaf extract,and it improved seedling establishment under flooding.Acceleration of growth occurred due to seed pretreatment,which resulted longer seedling and greater accumulation of biomass.Seed priming greatly hastened the activities of total amylase and alcohol dehydrogenase in Swarna-Sub1 than in Swarna.Swarna-Sub1 outperformed Swarna when the plants were cultivated under flooding.Weed biomass decreased significantly under flooding compared to non-flooding conditions.Seed priming had positive effects on yield and yield attributing parameters both under non-flooding and early flooding conditions.     

山羊传染性胸膜肺炎荧光定量PCR检测方法的初步建立

为实现山羊传染性胸膜肺炎(CCPP)快速检测,研究基于病原体山羊支原体山羊肺炎亚种的16S rRNA基因,设计合成特异性引物及探针,采用5'FAM-TAMRA3'标记物进行标记.结果显示,试验建立的CCPP-16S实时荧光定量PCR方法可特异性检测CCPP,产生特异性荧光信号,对相关其他病菌无法检出荧光信号;以CCPP...     

双闭环控制采摘机器人机械手设计——基于PLC和CAN总线

采用双闭环控制系统,基于PLC运动控制器和CAN总线,提出了一种新的采摘机器人机械手关节分布式控制方案,并采用模块化思想设计了机器人关节电机控制系统、CAN模块及PLC控制器。采摘机器人机械手的关节采用谐波减速器进行调节,利用霍尔传感器和红外线传感器及光电编码器进行图像、转速和障碍物触碰的信号采集,采集信号利用A/D转换器将数据传输给PLC控制器。机械手的执行末端采用CAN总线控制,并利用变频器传递的通信信号,实现了末端执行器的并行控制,使多机械手处于最佳动作状态。最后,在双闭环控制方案的基础上加入了前馈控制环境,利用前馈控制环节可以实现对系统的实时控制,改善了系统的静态性能,实现了机械手对实际采摘位置的有效追踪。实验和仿真模拟表明:位移时间曲线平滑无突变,表明机器人在运行过程中平稳、无振动,机器人工作的可靠性较高,对路径的追踪精度较高。