中国西南横断山区的野生鸭茅资源

中国西南横断山区广泛分布野生鸭茅资源,包括鸭茅亚种和喜马拉雅鸭茅亚种。二者的分布范围相近,但在形态及物候发育等方面存在明显差异,鸭茅亚种的主要农艺性状优于喜马拉雅鸭茅亚种。两个亚种在人工控制条件下可以杂交形成三倍体后代,但自然状态下尚未发现二者杂交的确切证据。近年来,中国加强了对两个鸭茅亚种的基础研究,但从保护和利用研究角度出发,开展的工作较少。从来源角度分析,喜马拉雅鸭茅亚种为当地起源类型,鸭茅亚种为外来归化种的可能性较大。由于喜马拉雅鸭茅面临鸭茅亚种的竞争威胁,因此应加强中国喜马拉雅鸭茅亚种野生资源的保护和开发利用研究。

The Wild Dactylis glomerata Germplasm Resources of Hengduan Mountains in Southwest China

Hengduan mountains lie in southwest of China,which is famous by the extending from south to north.There widely distribute wild Dactylis glomerata germplasm resources,which belongs to subspecies glomerata,and subspecies himalayensis.The distribution range of two subspecies is nearly the same,but much difference existed in the morphological characters and phenological development in two subspecies.Through hybridization of subspecies himalayensis and subspecies glomerata in artificial condition,triploid offspr...