不同根际溶解氧质量浓度对生育中后期水稻根系和抗氧化酶活性的影响

Effects of different rhizosphere dissolved oxygen mass concentration on rice root growth and antioxidant enzyme activities at middle and late growth stage

为探究溶解氧质量浓度对不同基因型水稻品种生育中后期根系生长发育的影响。以4种不同基因型水稻为试验材料,采用水培法,研究不同溶解氧质量浓度对水稻生育中后期根系形态、根系抗氧化酶活性及可溶性蛋白质含量的影响。结果表明,生育中后期高氧处理可显著增加水稻的根长和根条数,低氧处理对水稻根系的伸长影响不大,根条数有所增加,均未达到显著水平;高氧处理可显著增加抗氧化酶活性及可溶性蛋白质含量,说明水稻生育中后期增加根际溶解氧质量浓度有利于水稻根系的生长发育,有效延缓根系衰老。

In order to explore the influence of dissolved oxygen mass concentration on the root growth of different rice cultivars at middle and late growth stage,four rice cultivars were cultured in nutrient solution and the dynamic change of root morphology,root antioxidant enzyme,and soluble protein content were measured. The results showed that root length and number were significantly increased under high oxygen mass concentration of rhizosphere,while low oxygen mass concentration inhibited root elongation and increased the root number per plant,but the difference was not significant. In addition,high oxygen mass concentration could significantly increase the antioxidant enzyme activity and soluble protein content. It suggests that the increasing of dissolved oxygen mass concentration is beneficial to rice root growth,thus slowing down the senescence of root at middle and late growth stage of rice.