饲用甜菜新品种“甜饲2号”的选育

饲用甜菜新品种“甜饲2号”是以甜菜雄性不育系G04A为母本,饲用甜菜自交系LC-1—1为父本,通过杂交选育而成的F1代杂交种。多点试验平均根产量为107751．8kg／hm^2,较时照增产2．3％;含糖率为13．7％,比对照高5．0度。2007年参加了生产示范试验,2008年底通过甘肃省农作物品种审定委员会认定命名。该品种经济产量高,蛋白质含量和含糖率较高,抗病性强,适应性广。     

甜橙新品种——桂橙一号的选育

桂橙一号是冰糖橙优良芽变株系,成熟期11月下旬,平均单果质量154.0g,大小较均匀,可食率75.66%,可溶性固形物含量14.6%,全糖12.47%,酸0.38%,风味浓郁,有蜜香,甜脆化渣,树形开张,丰产稳产,商品性好,适应性强,果实耐贮藏。     

西葫芦新品种寒丽的选育

西葫芦新品种寒丽是以我国地方品种的分离后代经多代自交选育而成的纯合优良自交系F-70为母本,以国外引进品种的分离后代经多代自交选育而成的高代稳定自交系72-118为父本杂交育成的早熟一代杂交种。该品种植株矮生,株型紧凑,具有早熟、丰产、生长势强、抗逆性好、膨瓜速度快、持续结瓜能力强、商品性好等特点,667m2产量5000kg左右。适于我国大部分地区早春保护地和露地等种植。     

中小果型无籽西瓜新品种博帅的选育

博帅系湖南博达隆科技发展有限公司以9048为母本、M-2为父本杂交育成的中小果型黄瓤无籽西瓜新品种。该品种全生育期90d左右,雌花开放至果实成熟约需27d。植株生长势中强,抗病抗逆性强。果实短椭圆形,果形指数1.2。果皮浅绿底覆绿色齿条带,厚度0.9cm,硬韧,耐贮运。瓤色鲜黄,质脆爽口,纤维少,无籽性能好;中心可溶性固形物12%～13%,边部9%～9.5%。单果质量4kg左右,667m2产量2700kg左右。适应性广,全国各地均可栽培。2009年3月通过湖南省农作物品种审定委员会审定,审定编号:湘审西瓜2009002。     

加大农业综合开发力度，确保农业经济稳步增长

邵阳县农业综合开发工作紧紧围绕农业增效、农民增收这一目标,不断加大农业综合开发力度,促进了农业经济持续增长。通过项目建设有效改善水利条件,提高了抵御自然灾害的能力。以农业综合开发项目区为平台。按照“三合”要求．创新开发模式,整合支农项目,实行规模开发,引领助推新农村建设。     

Variation in growth and aggression of juvenile brown trout (Salmo trutta) from upstream and downstream reaches of the same river

Abstract –  To investigate differences in behaviour and growth between juvenile brown trout from spatially separated reaches, fish were collected from above and below a weir in Silverstream, New Zealand. Population level differences in mass-specific growth rates and aggression level were examined in tank experiments. Monitoring of mass-specific growth rates found that relative growth rates between fish of different sizes varied between fish from the upstream reach but not between fish from the downstream reach. Large individuals grew faster than smaller individuals from the upstream reach but no effect of relative fish size on growth was found among fish from the downstream population, indicating that social organisation in the two populations differed. When tested in pairs, juvenile brown trout from the downstream population were found to be more aggressive than those from the upstream population. Differences in the allometric relationship between growth rate and fish size and in the levels of aggressiveness appear to be related to the failure to form dominance hierarchies among fish from the downstream reach, a fixed behavioural trait most likely related to prior experience of crowding or different genetic backgrounds.     

Spatiotemporal dynamics of plant diversity in response to farmers’ evolved settlements in Shanghai

The expansion of the Shanghai metropolitan region has caused a substantial amount of farmland to become urbanized. Most farmers have lost their land and have been relocated from villages to new collective settlements, resulting in dramatic changes in the landscape pattern. This study explores the effects of this transformation on the spatiotemporal dynamics of plant diversity. We randomly sampled 22 plots comprising 294 subplots within two crossed transects that pass through 5 traditional villages and 17 new settlements. The results show that resettlement has exerted significant effects on plant species diversity, both temporally and spatially. Temporally, the Gleason index (GI) of total species over time could be ordered as 1990s > 2000s > 1980s, while Shannon’s diversity index (SHDI) was ordered as 2000s > 1990s > 1980s. Spatially, the GI of total species decreased from the urban center to the exurbs or from the inside to the outside of the built-up areas. SHDI was highest in suburbs or ecotones. Furthermore, the GI of total species had significant correlations with those of indigenous species, exotic species, and planted species (r > 0.90, p < 0.01) as well as with the region and location of settlement (r < −0.48, p < 0.01). Both indigenous and exotic species had significant positive correlations with total species richness at 0.01 levels. Generally, compared with traditional settlements, new settlements displayed greater richness and diversity of plant species, primarily because of the exotic species present in new settlements. The farmers’ socio-economic status was found to be the primary cause of differences in species richness. To protect indigenous and wild species, it is necessary to take into account local knowledge in villages to encourage Chinese farmers to participate actively in community greening. A bridge should be built between traditional villages and modern settlements and between the past and future for farmers.     

海南被子植物分布新资料(Ⅱ)

报道了海南岛被子植物5个新记录种。新记录种分别为三室黄麻(Corchorus trilocularis L.)、钻叶紫菀(Symphyotrichum subulatum(Michx.)G.L.Nesom)、光果姜(Zingiber nudicarpum D.Fang)、线纹香茶菜(Isodon lophanthoides(Buch.-Ham.ex D.Don)H.Hara)、狭序泡花树(Meliosma paupera Hand.-Mazz.)。凭证标本保存于中国热带农业科学院植物标本室(ATCH)。     

中早熟高产抗病抗虫棉品种衡棉4号的选育

衡棉4号是用GK12为外源抗棉铃虫Bt基因的供体,以具有海岛棉、陆地棉和野生棉遗传基础的省1322系作抗病亲本,以冀棉27为丰产亲本,在黄枯萎混生重病地、不防治棉铃虫的高压胁迫下连续定向选择培育而成.突出表现早熟、抗棉铃虫、高产和抗病.适宜在冀中南及同一生态类型地区推广.     

抗病虫棉花新品种邯棉103的选育

邯棉103是以早熟、高产、优质、抗病的邯333为母本,以转基因抗虫棉GK-12为父本杂交,经枯黄萎混生病圃定向选择培育而成.该品种具有高产、稳产、抗病、抗虫、吐絮肥大和衣分高等特点,2007年3月通过河北省品种审定委员会审定,适宜在冀中南及黄河流域棉区春播种植.