摘要
研究了一氧化氮(NO)和过氧化氢(H2O2)在吲哚丁酸(IBA)诱导万寿菊(TageteserectaL.)外植体不定根形成过程中的作用及其相互关系。结果表明:外源IBA与NO、H2O2一样对万寿菊外植体不定根形成有促进作用,且IBA与NO,IBA与H2O2协同增效。NO清除剂cPTIO和H2O2清除剂CAT均能抑制IBA对不定根形成的促进作用。同样,cPTIO和CAT亦能抵消IBA对NPA抑制不定根形成的逆转作用。可见,NO和H2O2是IBA诱导万寿菊不定根形成的必要条件。IBA处理提高了外植体内源NO和H2O2的含量,说明IBA是通过增加内源NO和H2O2水平实现对不定根形成的促进作用。cPTIO和L-NAME抑制了IBA对H2O2含量的促进作用,而CAT和DPI却不能抑制IBA对NO含量的促进作用。可见,NO和H2O2是IBA诱导万寿菊不定根形成的两个下游信号分子,且NO可能位于H2O2的上游。
The roles of NO and H2O2 in indole-3-butyric acid（IBA）-induced adventitious root formation in marigold plants（Tagetes erecta L.）and the order of action of these molecules within the signal transduction pathway were investigated. IBA treatment was able to induce de novo root organogenesis in marigold explants mimicking the effects of NO and H2O2. Treatment of IBA plus NO or H2O2 promoted adventitious root development compared with explants treated with NO,H2O2 or IBA alone. The IBA-mediated effect was differently reversed by NO scavenger cPTIO and H2O2 scavenger CAT. IBA was able to recover adventitious root development in auxin-depleted explants by NPA,whereas c-PTIO and CAT prevented this effect. Thus,NO and H2O2 were the prerequisite of adventitious root development induced by IBA. IBA treatments enhanced endogenous NO and H2O2 levels in hypocotyls. Therefore,the enhancing effect on the formation of adventitious root of IBA was through the promotion of NO and H2O2 formation. cPTIO inhibited IBA-triggered H2O2 generation. However,CAT failed to depress the NO content induced by IBA. Thus,H2O2 and NO may be the two downstream signal molecules of auxin signaling cascade,and NO may be an upstream signal molecule before H2O2.
出处
《园艺学报》
CAS
CSCD
北大核心
2011年第5期939-946,共8页
Acta Horticulturae Sinica
基金
中国博士后科学基金项目(20100470887)
教育部科学技术研究重点项目(211182)
甘肃省科技厅重大专项计划(1002NKDA038)
甘肃省自然科学基金项目(1010RJZA211)
甘肃省干旱生境作物学重点实验室开放基金课题
