摘要
以 13个水稻主栽品种及 11个F1代抽穗后 35d的种子为材料 ,进行种子休眠特性的研究。结果显示 ,30℃下 ,种子未去颖壳时 ,南京 11、桂朝 2号等品种的发芽率均高于 80 % ,无休眠性 ;IR36的发芽率仅为 19% ,具有较强的休眠性 ;越光、N2 2的发芽率分别为 2 %和 0 % ,具有极强的休眠性 ;F2 代种子的发芽率均不超过亲本 (越光除外 )。除去种子颖壳后 ,大多数供试材料的发芽率均显著提高 ,休眠性丧失 ,尤其是F2 代种子 ,但N2 2仍保持极强的休眠性。淀粉酶活性测定结果表明 ,酶活性与种子休眠性呈负相关。内源激素的分析表明 ,在吸水之前 ,不同休眠性品种的内源ABA和GA3 含量无明显差异 ,但吸水后 ,休眠性与GA3
Seeds from 13 cultivars and 11 F 1 generations were applied in seed dormancy test.All the seeds were harvested in 35 days after heading.Under 30 ℃,germination frequencies of intact seeds from Nanjing 11,Guichao 2 were exceeded 80 %,while from IR 36,Koshihicari,N 22 were only 19%,2% and 0%,respectively,and all F 2 generation had a lower germination frequency than their respective parents(except N 22).Germination frequency of dehusked seeds markedly increased respectively,especially in F 2 generation.The experiment showed that amylase activity was negatively related to seed dormancy.The change of endogenous ABA and GA 3 content in seeds after absorbed water showed that lower ratio of GA 3/ABA was related to the dormancy of rice seed.
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2001年第2期1-5,共5页
Journal of Nanjing Agricultural University
基金
农业部跨越计划中国超级稻研究项目 (Q2 0 0 0 2 5 )
教育部高等学校优秀骨干教师资助计划项目
