渍水对冬油菜苗期生长及生理的影响

以中双9号油菜为材料，通过盆栽试验研究苗期不同渍水时间对冬油菜生长和生理指标的影响。结果发现，光合色素含量在整个试验期间一直下降。其它生长及生理指标均表现为先升高后降低的趋势，其中相对生长率、根系活力、可溶性糖、根系丙二醛（MDA）含量、叶片超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性在渍水第13d时达到最高，而叶片MDA含量则在渍水胁迫24d时达到最大值。说明渍水胁迫对冬油菜幼苗地上部和根系生长产生显著影响。短期渍水胁迫下，油菜幼苗能够通过调节自身的生理代谢活动，维持一定的生长量；但是随着胁迫时间的延长，植株生理活动受到严重影响，油菜幼苗生长受抑制，相对生长率显著降低。

Effects of waterlogging on growth and physiological changes of winter rapeseed seedling （Brassica napus L. ）

Pot experiment was conducted to investigate the influence ot long physiology of winter rapeseed （ Brassica napus L. cv Zhongshuang 9 ） physiological properties of seedlings were increased at the beginning The maximum values, including plant biomass accumulation rate, seedlings -term waterlogglng on growm m~u Results showed that growth and except for the photosynthetic pigment content. root activity, soluble sugar, root MDA （malondi- aldehyde） content, SOD （superoxidedismutase） and CAT （catalase） activity of plant leaves, were obtained at 13d of waterlogging, and the maximum leaf MDA content was obtained at 24d of waterlogging. Results indicated that waterlogging stress significantly influenced rapeseed growth. They also indicated that seedlings growth could be maintained normal through regulating the metabolic activities under short - term waterlogging. If the stress was extended, seedling growth would be significantly inhibited.