A preliminary study on the hybrid origin of new taxa in Lycium(Solanaceae) Polymorphism of Starch Granule-Associated Proteins and 5′ Leader Sequence of GBSSI Gene in Indigenous Naked Barley (Hordeum vulgare L.) from Qinghai-Tibetan Plateau in China Cloning of Granule-Bound Starch Synthase Gene and Construction of Its RNAi Vector in Potato Tuber