根据受过干燥锻炼的幼苗存活率鉴定抗寒性将供试品种的种子放在24℃的黑暗中催芽48—54小时或在2℃的黑暗中催芽四周,随后用滤纸吸去幼苗周围多余水分,并放在用硫酸溶液保持的空气相对湿度为40%的干燥器内干燥24小时,再侵入9℃的充气水中24小时恢 Identification of cold tolerance based on survival rate of seedlings subjected to drying exercise The seeds of the tested varieties were germinated in the darkness at 24 ° C for 48-54 hours or germinated in the darkness at 2 ° C for four weeks and then the excess moisture around the seedlings was blotted with filter paper, And dried in a desiccator maintained at a relative humidity of 40% with sulfuric acid solution for 24 hours and then infiltrated into aerated water at 9 ° C for 24 hours