【作者】 杨学军； 喻方圆； 刘建兵；

【Author】 Yang Xuejun1,2,3,Yu Fangyuan1,Liu Jianbin4 (1.College of Forest Resources and Environment,Nanjing Forestry University,Nanjing,Jiangsu,210037,China;2.State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;3.Graduate University of Chinese Academy of Sciences,Beijing 100049,China;4.Hunan Provincial Test and Supervision Center of Tress Seedling,Changsha,Hunan,410004,China)

【机构】 南京林业大学森林资源与环境学院； 中国科学院植物研究所植被与环境国家重点实验室； 中国科学院研究生院； 湖南省林木种苗质量监督检验站；

【摘要】 采用差示热扫描(DSC)研究杉木种胚与胚乳,以确定种子的玻璃化状态。结果表明,种胚的吸热图谱中有两个玻璃化转变温度,第一个玻璃化转变温度(Tg1)约为-97℃,其受含水量的影响较小。而第二个玻璃化转变温度(Tg2)则随含水量的下降而显著升高,并且当种胚中含水量极低(0.9%)时Tg2消失。进一步研究了种子含水量、脂类和糖类含量与玻璃化转变的关系,结果表明脂类是影响杉木种胚热力学变化的主要成份,而糖类可以提升Tg2,说明杉木种胚的玻璃化状态受到种胚内多种物质成分的影响。更多还原

【Abstract】 Embryos and endosperms of Cunninghamia lanceolata seeds were investigated by differential scanning calorimetry(DSC) for evidence of existence of glassy state.The thermograms showed that C.lanceolata seed embryos had two glass transitions,and the first glass transition(Tg1) was at about-97℃ and seemed little affected by water contents.However,the second glass transition(Tg2) was obviously shifting with decreasing water contents,but the Tg2 could not be observed in C.lanceolata seed embryos when water content was extremely low(9%).The relationships between water content,lipid,sugar and glassy state of C.lanceolata seed embryos were also studied.It was found that the lipids were the major components responsible for the thermal transitions in C.lanceolata seed embryos and that sugar could shift Tg2 to some higher temperature,suggesting that the glassy state in C.lanceolata seed embryos was affected by many biological components inside the embryos,such as lipids,sugar and water etc.更多还原