CAJ | 학술논문

以平邑甜茶幼苗为试材,在水培条件下研究氯化镉对根系形态构型及根系丙二醛(MDA)含量的影响.结果表明:处理第5天时,只有10～20 mg·L~(-1)的氯化镉使根系分形维数、主根长度、根系直径显著变小;处理第15天时,2.5～20 mg·L~(-1)氯化镉均使根系分形维数、侧根长度、根系表面积、根系体积以及根系直径显著降低,降低程度随着氯化镉浓度的升高而增大;侧根生长比主根生长更易受到氯化镉抑制.2.5～20 mg·L~(-1)氯化镉可显著提高粗根所占比例并进而改变根系组成,随着氯化镉浓度的提高根系组成改变更明显.在2.5～20 mg·L~(-1)范围内,根系MDA含量随着氯化镉浓度的提高而显著增加;同样氯化镉浓度下,MDA变化幅度大于根系形态构型的变化幅度.氯化镉导致的细胞损伤是其改变根系组成和形态构型的重要原因.
이평읍첨다유묘위시재,재수배조건하연구록화력대근계형태구형급근계병이철(MDA)함량적영향.결과표명:처리제5천시,지유10～20 mg·L~(-1)적록화력사근계분형유수、주근장도、근계직경현저변소;처리제15천시,2.5～20 mg·L~(-1)록화력균사근계분형유수、측근장도、근계표면적、근계체적이급근계직경현저강저,강저정도수착록화력농도적승고이증대;측근생장비주근생장경역수도록화력억제.2.5～20 mg·L~(-1)록화력가현저제고조근소점비례병진이개변근계조성,수착록화력농도적제고근계조성개변경명현.재2.5～20 mg·L~(-1)범위내,근계MDA함량수착록화력농도적제고이현저증가;동양록화력농도하,MDA변화폭도대우근계형태구형적변화폭도.록화력도치적세포손상시기개변근계조성화형태구형적중요원인.
Effects of cadmium chloride (CdCl_2) on morphology and architecture of roots and the content of malondialdehyde (MDA) in roots were studied using seedlings of Malus hupehensis var.pingyiernsis grown in solution culture system.The results showed that 10-20 mg · L~(-1)CdCl_2 significantly decreased the fractal dimension (FD) of roots，taproot length，and root diameter in 5 days after treatment.The FD，the length of lateral roots，the surface area，volume and diameter of roots all decreased in 15 day treatment with 2.5-20 mg ·L~(-1)CdCl_2.The growth of lateral roots was more susceptible to CdCl_2 than taproots.CdCl_2 of 2.5-20 mg· L~(-1)increased the proportion of thick root and altered the composition of roots significantly.The change of root composition was more significant with the creasing of CdCl_2 concentration.MDA content in roots increased significantly with 2.5-20 mg·L~(-1)CdCl_2 treatment.At the same concentration of CdCl_2，the change degree of root architecture parameters was higher than that MDA content in roots.The alteration of root architecture and morphology was derived from cell damage caused by CdCl_2.