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[目的]探讨超氧阴离子对水稻根系生长和生长素分布的影响。[方法]以水稻中花11号为试验材料,分析了DDC(SOD抑制剂)和Tiron(超氧阴离子清除剂)对水稻根系生长、超氧阴离子产生和生长素积累分布的影响。[结果]DDC显著促进了初生根和不定根的伸长生长及其侧根的形成和伸长,Tiron则显著抑制了地上部分、初生根及其侧根的伸长生长,对不定根的形成和伸长及其侧根的生长也有显著的抑制作用。DDC诱导超氧阴离子增加,而Tiron使超氧阴离子的积累减少。DDC诱导生长素在根伸长区以后部位和维管束内的积累增加,相反,Tiron使生长素的积累减少。[结论]该研究结果表明超氧阴离子对水稻根系生长的调节与其诱导生长素积累和分布的变化有密切关系。
[Objective] The research aimed to discuss the effect of superoxide anion on root growth and auxin distribution in rice. [Method] With rice Zhonghua 11 as test material, effects of DDC (superoxide dismutase) and Tiron (superoxide anion scavenger) on root growth, superoxide anion production and auxin accumulation and distribution in rice were analyzed. [Result] DDC significantly promoted the growth of primary and adventitious roots and the formation and elongation of lateral roots. Tiron significantly inhibited the elongation and growth of aerial parts, primary roots and their lateral roots, the formation and elongation of adventitious roots and their lateral roots The growth also has a significant inhibitory effect. DDC induces an increase in superoxide anion while Tiron reduces the accumulation of superoxide anion. DDC induced auxin accumulation in the site and vascular bundles after root elongation, whereas Tiron reduced the accumulation of auxin. [Conclusion] The results of this study indicate that the regulation of superoxide anion on rice root growth is closely related to the change of its accumulation and distribution of auxin.