被子植物的繁殖器官和生殖系统的多态性及形成机制历来备受关注。近二十多年来，人们已经认识到某些物种花的进化过程及进化驱动力。然而对区域水平上花适应性进化选择力的研究方面，仍然知之甚少。对花泛化的起源及其维持机制研究更是匮乏。青藏高原拥有独特的地理环境和气候条件，是研究植物花适应性进化的理想场所。青藏高原是风毛菊属植物的现代分布中心之一，高原地区的风毛菊属植物的花部特征特别是接受花粉的花柱顶端的分枝在该属植物的进化过程中有着重要的进化学意义。它们的进化模式和驱动力是什么？本课题将对分布于该地区的风毛菊属植物的繁殖对策、花部特征特别是花柱分枝长度的变异对海拔的响应和它的适应意义进行研究，测定其遗传力和遗传相关，分析传粉者施加的表型选择在区域尺度变化的模式，以便探讨该属植物花部特征在高海拔的青藏高原的胁迫环境下的进化学意义及花柱分枝在该区区域尺度上的特有进化模式和机制。

The reproductive organs and system showed the great variety.It has abstracted extensive attention of people since the time of Darwin.The recently many years,The evolutional process and dynamics of flowers of some species have been known. But it was known little about the selectivity of adaptive evolution of flowers in the region level and there was a little study on the origin of flower generalization and maintaenance mechanism.The Qinghai-Tibetan plateau have unique geographical environment and climate condition, it is a ideal region to study the adaptive evolution of flowers. It was found that the flower characteristics, especialy the ramification of stylar apex receiving pollen,has important evolutional signification in earlier research works.Whether the flower characteristics and stylar ramification of all Saussurea plants ditributing in the plateau have such a evolutioal model or not? What's the dynamics foming that? Therefore, the reproductive strategy, flower characteristics, especialy varieties of the length of stylar ramification responding to altitude and its adaptive signification about Saussurea plants distributing in the plateau will have been studied and the heritablity of every characteristics will be determined. And the various model of phenotypic selection exerted by pollinator in the regional scale will be analysed, so that It will be probed that the evolutioal signification of the flower characteristics, special evolutional model and mechanism of stylar ramification of the Saussurea plants distributing in the stressful environment of the Qinghai-Tibetan plateau.