番茄种子萌发的交叉耐性研究  

Studies on Germination Cross-Tolerance of Lycopersicum esculentum Mill. Seeds

作　　者：陈玲[1] 宋松泉[1] 钱春梅[1] 傅家瑞[1] 

机构地区：[1]中山大学生命科学学院,广州510275

出　　处：《中山大学学报（自然科学版）》2000年第z2期112-118,共7页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家教育部留学回国人员科研启动基金资助项目

摘　　要：研究不同温度和水分胁迫对番茄种子萌发速率的影响，温度、ＮａＣｌ和ＰＥＧ ６０００预处理对番茄种子萌发和幼苗生长的交叉耐性诱导．在１５℃、２５℃和３０℃中，５０％萌发需要的时间分别是１８６ ｈ、４３ ｈ和 ４８ ｈ；５０％萌发需要的热时间（ｔｈｅｒｍａｌ ｔｉｍｅ）分别为１１６℃ｄ、４５℃ ｄ和６０℃ｄ；当萌发温度为３５℃时，种子的萌发速率和萌发率被严重地抑制，在整个萌发过程中未出现５０％萌发的时间，以及５０％萌发需要的热时间远远大于２１０℃ｄ．随着水势降低，种子的萌发速率、萌发率和幼苗生长量显著下降．１５℃、２５℃和３０℃，－０．１ＭＰａ、－０．２ＭＰａ和－０．４ ＭＰａ的ＮａＣｌ和 ＰＥＧ ６０００溶液预处理明显地提高番茄种子萌发和幼苗生长的交叉耐性．Effects of different temperature and water stress on germination rate of Lycopersicum esculen- tum Mill. seeds, and induction of cross-tolerance by temperature, NaCl and PEG 6000 in seed germi- nation and seedling growth were studied. The times required for 50% germination were 186 h at 15 ℃, 43 h at 25 ℃ and 48 h at 30 ℃, respectively. The thermal times for 50% germination were 116 degree days ( ℃d) at 15℃, 45 ℃d at 25 ℃ and 60 ℃d at 30℃, respectively. When the germina- tion temperature was 35 ℃, germination rate and germination percentage were greatly inhibited,the times required for 50% germination had not been found, and the thermal times for 50% germination was more than 210 ℃ d. Germination rate and germination percentage of seeds, and consequent seedling growth significantly decreased with decrease of water potential. Cross-tolerance for seed germi- nation and seedling growth was dramatically increased by pretreatment of 15 ℃, 25℃ and 30℃, and of -0.1 MPa, -0.2 MPa, and -0.4 MPa NaCl and PEG 6000.

关 键 词：交叉耐性 萌发活性 番茄种子 预处理 温度 热时间 水分胁迫 

分 类 号：Q945[生物学—植物学]