Geographic patterns of low-polymorphic enzyme-encoding genes allelic variation in Aegilops tauschii Genetic Variation of Allozymes in Medicago ruthenica A Preliminary Study on Genetic Variation and Relationships of Pinus yunnanensis and Its Closely Related Species Pollination Phenology and an Indirect Estimate of Gene Flow in Natural Populations of Psathyrostachys huashanica Genetic Structure of Natural Populations of Wild Soybean (Glycine soja) in Beijing Region