【摘要】 多效唑浸种对杂交晚稻秧苗有明显的控制徒长效应。对种子发芽并无不良影响。在本试验浓度(5～100ppm)和浸种时间(6～24h)范围内,浓度越高,处理时间越长,控长效应越明显、并随着秧龄的增长而提高。方差分析表明,多效唑对秧苗的控长效应在各处理浓度和时间之间的差异均达极显著水平。经多重比较(SSR 法)结果表明,除少数低浓度短时间处理外,其他各处理组的15天幼苗均显著或极显著矮于对照。随着多效唑处理浓度的增加、苗体内过氧化物酶活性有所提高,同工酶谱及扫描图也有量和质的变化,并在 AI 区发现了新的酶带,证实了过氧化物酶与株高有密切的关系。多效唑的控长效应还表现有基因型的差异。本文对最适处理浓度和时间组合的选择进行了讨论。更多还原

【Abstract】 Soaking seed in MET markedly control young seedling spindling of hybrid rice in second rice crop,without any negative effects on seed germinaton.In a range of MET concentration of 5-100ppm and soaking time of 6-24 h,the higher the concentration and the longer the treating time,the more ob- vious effect of control would be obtained.Such effect was increased with seedling age increasing。The dif- ferences of MET control effect between concentrations and different times were highly significant。Plant height of 15-day-old seedling in all treatments was significantly or highly significantly lower than that of the control,except a few treatments treated with low concentration and in a short time。MET control effect was also affected by rice genotypes。Some selection principles about optimum combination of con- centration with time are discussed in the paper。Peroxidase activity of seedling in vivo elevated with in- creasing of the concentration and treating time of MET。The change of quality and quantity of isozymogram and its scanning profile occurred simultaneously,and some new bands in Al zone were found,indicating that the plant height is closely correlated with peroxidase。更多还原