莴苣种子贮存最适含水量与贮藏寿命研究

含水量为9．9％～1．6％的莴苣种子，密闭包装后于50、35、20℃保存，定期检测种子生活力和活力，并计算种子贮藏寿命。结果表明，莴苣种子在50,35、20℃贮藏，最适含水量分别为2．0％-3．0％、1．9％-4．0％和1．9％-6．4％。种子最适含水量随着贮藏温度的升高而降低。随着贮藏温度的降低，种子寿命不断延长，在50～20℃的范围内，每降低15℃，种子寿命延长10．2倍。随着种子含水量的降低，种子寿命不断延长，每降低1％的含水量，种子寿命延长1．2倍。种子含水量与贮藏寿命成对数回归关系，关系式为Y=b＋mlnX，其中Y为含水量（％），b,m为常数，x为种子寿命（d）。

Studies on Optimal Moisture Content and Longevity of Lettuce Seed Stored at Different Temperatures

Lettuce seeds with moisture content ranging from 9.9% to 1.6% were hermetically packaged and stored at 50 ℃,35 ℃ and 20 ℃ to calculate the longevity by regularly determining the seed viability.The results showed that the optimal moisture contents of lettuce seed stored at 50 ℃,35 ℃ and 20 ℃ were 2.0%～3.0%,1.9%～4.0% and 1.9%～6.4%,respectively.The optimal moisture content decreased as the storage temperature increased.Seed longevity increased as the storage temperature decreased.Seed longevity increased 10.2 times as the storage temperature decreased by 15 ℃ in the range of 50 ℃ to 20 ℃.Seed longevity increased as the seed moisture content decreased.Seed longevity increased 1.2 times as the seed moisture content decreased by 1%.There was a relationship of logarithm regression between seed moisture content and seed longevity,the equation model was Y=b+mlnX,which Y was the seed moisture content(%),b and m were the constant,X was the seed longevity(d).