Influence of Mercury on Soybean Plants (Glycine max L.) at Low pH

The influence of Hg on soybean plants under different pH conditions and Hg concentrations was studied. Growth inhibition by Hg was higher in roots than the upper part of the plant, but was highly dependant on pH condition. Growth inhibition of roots was observed when Hg concentration was higher than 1 mg Hg L⁻¹ for pH 4.0 and 5 mg Hg L⁻¹ for pH 6.0. Using ²⁰³Hg as a radioactive tracer, the amount of Hg (1 mg Hg L⁻¹) uptake in root was found to be about 1.5 times higher at pH 4.0 than that at pH 6.0; suggesting that Hg when highly accumulated at the lower pH induced inhibition of root growth. Decreased amounts of Hg due to evaporation during the plant growth were very low, but were higher at pH 6.0 than that at pH 4.0. There was hardly any translocation of Hg from roots to the upper parts through the stem within 24 h.     

优质香稻不育系玉香A的选育及利用

玉香A是利用优质常规稻晚香10号与玉米稻杂交的F4中的优良单株与金23A杂交,经7代回交育成的一个新的优质香稻不育系,于2003年2月通过湖南省品种审定.玉香A属中熟早籼类型,株型紧凑,茎秆粗壮,叶鞘、稃尖均无色;不育性稳定,群体不育株率100%,花粉不育度99.99%,套袋自交结实率为0.025%;品质性状好,米粒香味纯正;开花习性好,易于繁殖制种;配合力强,利用该不育系已选配出农平302、农平202等优质高产新组合.     

番茄新品种哈串珠203的选育

哈串珠203是以R2233为母本、以H2477为父本配制成的小型串番茄一代杂种。无限生长类型,生长势强,植株颜色深绿,单总状花序,普通叶形,花黄色,红果,圆形,单果质量15～22g,果实成串生长,每串可留10～12个果。未成熟果有绿肩,成熟果为红色。果实硬度较好,耐裂果。生育期为115d(天)左右,果味酸甜,口感好。抗枯萎病,耐病毒病。一般产量在3600kg·(667m2)-1左右,适合黑龙江省早春或保护地长季节栽培。     

甜菜抗丛根病新品种内甜抗203的选育

甜菜新品种内甜抗203（原名内102）是多胚型二倍体抗丛根病品种。该品种在内蒙古自治区甜菜品种抗病区域试验中,平均根产量44715．0kg／hm^2,比对照种甜研303提高97．7％;含糖率15．67％,比对照种提高1．34度;产糖量7006．8kg／hm^2,比对照种提高116．2％,丛根病病情指数17,比对照种降低18。在内蒙古自治区甜莱品种普通组生产试验中,根产量69225.0kg／hm^2,比对照提高62．0％;含糖率16．85％,比对照提高0．08度;产糖量11664.4kg／hm^2,比对照提高62．8％,达到丰产型品种标准;在内蒙古自治区甜菜品种抗病组生产试验中,根产量、含糖率、产糖量分别比对照提高182．6％、1．10度、203．8％,丛根病病情指数比对照降低47．9,达抗丛根病型品种标准。