摘要
5－10μmol／L的甲基紫精（MV）处理末吸涨或已萌动的杂交水稻种子1d后，种子发芽率与对照差异不大，但活力指数和钟长生长受到显著抑制，尤其胚根的生长受抑更甚，使胚芽／胚根长度比值提高1．4-11．0倍。组织的电解质渗漏率增大，胚芽鞘不能转绿，仅含少量或几乎不含叶绿素，随后逐步死亡．MV处理三叶期叶片切段或完整幼苗根部皆引起膜渗漏，叶绿素降解，光合速率下降和呼吸速率上升。杂交稻"代杂"对MV的敏感性稍低于父本"七桂早"和母本"Lemont"，与"Lemont"较接近．MV既可降解已形成的叶绿素又可抑制叶绿素的形成。
Dry or germinated seeds from hybrid rice 'Youza' and its parents'Qiguizao' and u Lemont' were treated by 5-10 μmol/L of methyl viologen(MV) for 24 hours. Seed vigor and seedling growth were inhibited pronouncedly butgermination rate was not disturbed. The ratio of coleoptile/radicle length increased by 1.4- to11.0-fold over the control because the depression of radicle growth was more serious thanthat of plumule. Tissue electrolyte leakage was enhanced and subsequent greening did notoccur, then seedlings were dead in the following few days. MV treatment with leaf segmentsor roots of intact rice seedlings at 3-leaf stage caused membrane leakage, chlorophylldegradation, the decline of photosynthesis and the increase of dark respiration. Theresponse of hybrid rice Youza to MV was slightly less susceptible than its parents. Theresults suggest that MV can enter the different organs of rice and display its toxicity. MVseems to induce not only the oxidative degradation of chlorophyll but also the limitationof chlorophyll formation.
出处
《热带亚热带植物学报》
CAS
CSCD
1999年第3期217-222,共6页
Journal of Tropical and Subtropical Botany
基金
广东省自然科学基金!970653
关键词
甲基紫精
水稻
种子活力
胚芽鞘失绿
幼苗生长
Methyl viologen, Rice, Seed vigor, Chlorosis phenomenon of coleoptile,Oxidative bleaching of chlorophyll
