【摘 要】
:
对12种34个地理种群的内蒙古棘豆属植物核糖体ITS区段和5.8S基因序列进行比较分析,并采用Maximum Likelihood法构建系统发育树.结果表明:支持棘豆属植物为单系起源,支持《内
【机 构】
:
内蒙古师范大学 生命科学与技术学院,包钢十五中
论文部分内容阅读
对12种34个地理种群的内蒙古棘豆属植物核糖体ITS区段和5.8S基因序列进行比较分析,并采用Maximum Likelihood法构建系统发育树.结果表明:支持棘豆属植物为单系起源,支持《内蒙古植物志》将黄毛棘豆(Oxytropis ochrantha)、多叶棘豆(O.verticillaris)、二色棘豆(O.bicolor)和砂珍棘豆(O.racemosa)归入真棘豆亚属(Subgen.Euoxytropis)轮叶棘豆组(Sect.Baicalia Stell.ex Bunge)的观点.推测多叶棘豆和砂珍棘豆ITS2区段出现的C/T转换可能是其部分种群混杂在其他物种中的主要原因,但基因转换对于系统发育的影响仍尚未可知.研究不支持传统分类学上对鳞萼棘豆(O.squammulosa)与刺叶柄棘豆(O.aci ph ylla)的划分,系统发育树显示二者聚为一支,而非与传统分类学上界定的同组或同亚属植物形成一支;结合植物地理学研究结果,认为刺叶柄棘豆与鳞萼棘豆为地理替代种.推测刺叶柄棘豆可能为多系起源物种.线叶棘豆(O.fili formis)和东北棘豆(O.coerulea与真棘豆亚属物种构成姐妹群,而非单室棘豆亚属植物.研究认为在物种界定过程中,只将少数几个形态学特征作为主要分类依据欠妥.
其他文献
In the first paper in this series, a variational data assimilation of ideal tropical cyclone (TC) tracks was performed for the statistical-dynamical prediction
Response of two wheat cultivars (Triticum aestivum cv. YM 158 and NM 9) to the herbicide chlorotoluron and the effect of two forms of dissolved organic matter o
Based on multi-temporal remotely sensed materials of both 1985 and 2000, we analyzed the effects of land-use types and their conversions on desertification in M
An aerobic bacterium, capable of degrading the new chloronicotine pesticide acetamiprid, was isolated from the sludge of pesticide factory after successive enri
Given the speed requirements of a mechanical press slider, a differential gear train is adopted instead of the belt and gear drive of a general mechanical press
Using the exposure simulation experiment, the action of petroleum affecting the accumulation of the trace metals including copper (Cu) and cadmium (Cd) in litto
口腔颌面部恶性肿瘤是一种严重威胁人类健康的常见病,其发病率和死亡率有逐年上升的趋势[1].化疗是治疗口腔颌面部恶性肿瘤的主要手段之一.肿瘤所在部位、肿瘤细胞的类型、细
Shortcut nitrification for ammonium-rich wastewater is energy-saving and cost-effective procedure that has become one of the hotspots in the field of biological
结合生产经验,讨论了同等材质、同样功率条件下六缸发动机排气岐管流道形状、圆弧过渡曲率半径、局部壁厚、使用环境等因素对排气岐管寿命周期的影响。提出了圆形或椭圆形流
黄河源盆地位于青藏高原东北部,是黄河的源头地区,对环境和气候变化非常敏感。对黄河源盆地中的河湖相沉积物进行了孢粉分析,获得丰富的孢粉数据,结果显示孢粉组合以菊科、蒿