几种同域分布姜花属植物的种间杂交亲和性及杂交后代种子活力

The Crossability and Hybrid Seed Vigor among Several Sympatric Hedychium(Zingiberaceae) Species

种间配子不亲和以及种间杂交种子活力低是众多的物种间杂交隔离机制中的两个方面。通过对云南澜沧地区分布的4种(型)姜花属植物——圆瓣姜花(Hedychium forrestii)、草果药(H.spicatum)、两类型滇姜花(H.yunnanense)间进行野外杂交试验,比较杂交结实率、每果种子数以及杂交种子的萌发参数等指标来分析4种(型)姜花之间的杂交亲和性和杂交后代表现,发现4种(型)姜花属植物配子间都具有不同程度的亲和性,但种间杂交种子的萌发适合度比同种授粉获得的种子低。结果表明,这4种(型)姜花属植物间配子亲和性不是有效的种间隔离机制,种间杂交种子活力低是一种不完全的隔离机制,它们在同域分布的地区,仍然有形成杂交后代的可能性。

Gametic incompatibility and low hybrid seed vigor are two of multiple species reproductive barriers. In order to infer the gametic incompatibility and hybrid seeds fitness of sympatric populations among Hedychium forrestii,H.spicatum and two morphs of H.yunnanense,we have done a set of field cross experiments among these Hedychium species in Lancang,Yunnan Province,and then compared the fruit set,seed number per fruit and germination data of seeds from cross experiments. The experiments showed that the gametic compatibility between these species are different,and the germination performances of hybrid seeds are worse than the intraspecies outcrossed seeds. These results suggested that gametic incompatibility is not the effective reproductive barrier among these species and hybrid seeds fitness is the incomplete reproductive barrier among these Hedychium species,which indicated that hybridization may exist among them.