杨品种‘普瑞’和‘107’对模拟酸雨胁迫的生理响应

通过测定杨(Populus×euramericana)抗硫新品种‘普瑞’和‘107’在3种梯度酸雨胁迫下的各项生理指标,研究酸雨胁迫对2个杨品种影响的差异。结果显示,在酸雨胁迫下,‘普瑞’叶片受伤害程度明显轻于‘107’,可以维持较稳定的光合作用,显示出较强的抗酸雨胁迫能力。酸雨胁迫下,‘107’光合作用强度显著下降,非气孔因素是其下降的主要原因。酸雨在一定程度上破坏了2个杨品种的水分平衡,尤其对‘107’的影响程度更为明显,但气孔关闭不是引起其光合作用强度下降的主要原因。研究结果表明杨品种‘普瑞’在酸雨环境下具有更强耐受性。     

太子参‘柘参1号’离体快繁试验

以太子参‘柘参1号’叶片、茎段为外植体进行离体快繁试验,结果表明：带腋芽的茎段能够诱导出丛生芽,且诱导率较高,最佳诱导培养基为MS + 6-BA 1.0 mg/L + NAA 0.2 mg/L +蔗糖30 g/L;增殖培养基为MS + 6-BA 1.0 mg/L + NAA 0.2 mg/L +蔗糖30 g/L;生根培养基为MS + NAA 0.2 mg/L +蔗糖30 g/L。     

Everything in moderation: Archaea as ‘non-extremophiles’

Well characterized and cultivated archaea are prokaryotic specialists that thrive in habitats of elevated temperature, low pH, high salinity, or strict anoxia. Recently, however, new groups of abundant, uncultivated archaea have been found to be widespread in more pedestrian biotopes, including marine plankton, terrestrial soils, lakes, marine and freshwater sediments, and in association with metazoa. Research efforts are presently focused on characterizing the physiology, biochemistry and genetics of these abundant and cosmopolitan but poorly understood archaea.