STUDY ON THOUSAND-SEED WEIGHT,LONGEVITY AND VITALITY OF SEEDS OF BETULA LUMINIFERA STUDIES ON THE PRINCIPAL STORAGE CONDITIONS FOR SEEDS OF VATICA ASTROTRICHA HANCE Ⅰ. SEED MOISTURE CONTENT AND METHODS FOR MEASUREMENT OR CONTROL Effects of different treatments on seed germination of Swertia davidii Effects of different treatments on seed germination of Swertia davidii Mapping of quantitative trait loci associated with seed longevity of rice after nearly 10 years of seed storage Effect of Seed Moisture Content on Seed Storage Longevity