A Study on Ancient Barley, Wheat and Millet Discovered at Changguo of Tibet Photosynthetic Characteristics and Photoprotective Mechanisms in Highland Barley Effects of climatic factors on thousand kernel weight of highland barley STUDIES ON THE DAMAGE AND ECONOMIC THRESHOLD OF WHEAT SHEATH MINING FLY TO HIGHLAND BARLEY In Vitro Induction of Haploid Plantlets from Unpollonated Ovaries of Highland Barley Relationship between mature spike number of highland barley and climatic factors