摘要
研究表明:与白光对照相比,蓝光明显抑制水稻幼苗的生长,并使幼苗体内的自由态IAA、GA1、玉米素和二氢玉米素含量下降,ABA含量和乙烯释放量则明显增加。说明蓝光对水稻幼苗生长的影响与其体内激素状况有关。
here are more evidences that cellelongation is affected by phytohormonesand light. Researchs on the interactionbetween red light and phytohormoneswere done and made a hypothesis thatphytohormones may be the second messenger in light act. But so far there isno reports about the interaction betweenblue light and phytohormones.Long-term effects of pure bluelight on the growth and levels of endogenous phytohormones were investigated. Compared with white light ordarkness, blue light suppressed thegrowth of rice seedlings (Fig. 2 ), increased the leaf angle and made leaf unfolding earlier and faster. Seedlingsgrown under long-term blue light irradiation had lower concentrations of endogenous free IAA (Fig. 3 ), GAl (Fig.5 ), zeatin and dihydrozeatin (Table 1 )and an increase in ABA content(Fig. 6)and rate of ethylene release (Table 2 ).Therefore,the morphological changes ofseedlings treated with blue light may bethe resulted from the changes of endogenous phytohormone levels in theseedlings.The activity of IAA oxidase wasincreased in blue light-treated seedlings(Fig. 4 ), it could be suggested the decrease of endogenous free IAA level isdue to the augmented oxidation by increased IAA oxidase activity.
关键词
蓝光
水稻
生长
内源激光
幼苗
blue light, rice, growth, endogenous phytohormones